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Copyright of Journal of Ground Improvement is the property of Journal of Ground Improvement Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Railway Construction Technology is the property of Railway Construction Technology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Guangdong Architecture Civil Engineering is the property of Guangdong Architecture Civil Engineering Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Engineering Geology / Gongcheng Dizhi Xuebao is the property of Journal of Engineering Geology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Railway Construction Technology is the property of Railway Construction Technology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The hyporheic zone is a region where surface and subsurface water mix in rivers. It is an important area for the exchange of mass and energy and an essential habitat for aquatic organisms. However, the deposition of colloidal particles in the hyporheic zone can modify the hydrodynamics and ecological environment of the river system. Through recirculating flume experiments and numerical simulations, this paper aims to investigate the transport of colloidal particles between stream and streambed, and clarify the pattern of colloidal particles′ deposition in the hyporheic zone as well as the influence of different factors over particles′ deposition. The results show that the colloidal particles in the overlying water will gradually retain in the streambed and accumulate in the shallow layer. The horizontal distribution of the retained particles tends to be higher on the stoss- side and lower on the lee- side. Hyporheic exchange, settlement of particles and retention of streambed are 3 most important factors in the deposition of colloids in the hyporheic zone. This paper can be helpful for understanding ecological and environmental functions of colloidal particles in hyporheic zone, and it can provide theoretical support for environmental and ecological restoration and health management of rivers. [ABSTRACT FROM AUTHOR]

The produced water of oilfield binary flooding contains a large number of residual oil displacement agents such as polymers and surfactants. The interaction between oil displacement agents and water results in the enhanced stability of oil droplets and colloidal particles in the produced water. The treatment cost of traditional coagulation technology is high, the amount of sludge is large, and the quality of treated water is difficult to meet the requirements of reinjection indicators. This paper studies the influence of the process of sedimentation-aeration-biological contact oxidation-filtration on the turbidity, particle electronegativity and particle size distribution of the produced water from binary flooding. The result showed that the best process: gravity sedimentation for 12 h, aeration for 12 h under the condition of aerated water ratio of 30∶1, biological contact oxidation for 7 d, using fiber ball as filter material to filter the produced water from binary flooding. The field test has achieved good treatment effect, and the treated water quality meets the requirements of reinjection with oil content less than 5 mg/L, solid suspended solids less than 10 mg/L, and the median particle size of suspended solids less than 2 μm. [ABSTRACT FROM AUTHOR]

A large number of municipal metro tunnels and water diversion tunnels are constructed by using the shield method, and the ground settlement deformation caused by tunnel construction is the most direct indicator of engineering risk. The Peck formula is the most empirical method widely used in predicting ground surface settlement due to tunnel construction. Based on the measured data of long distance shield tunnel with water-rich sandy stratum, this paper discussed and analyzed the applicability of the theoretical values of the key parameters of the Peck formula, supplemented by model numerical calculations, to obtain the applicability and differences between the actual surface settlement troughs and the theoretical calculated settlement troughs for tunnels with water-rich sandy stratum. The results of the study show that, a) in the case of shield tunnels in deep buried sandy strata with burial depths and excavation ratios H/D＞5 and where geology cannot uncover impermeable layers, the subsidence is generated under undrained conditions and the recommended range of loss rates for the target strata is 0.5% to 1%; b) for the “load-carrying arch”, which is buried at a greater depth and formed within the strata, the vault top is farther away from the vertical distance of the surface settlement, resulting in the measured surface settlement trough width being much smaller than the theoretical calculation of the settlement trough width; c) an improved Lee formula endowed with parameter n is proposed to establish the relationship between the settlement of the tunnel vault and the maximum ground settlement. [ABSTRACT FROM AUTHOR]

Copyright of Transactions of the Chinese Society of Agricultural Engineering is the property of Chinese Society of Agricultural Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In order to solve the problem of construction stratum disturbance caused by shallow overburden layer of shield tunnel crossing river, and the problem of stratum settlement caused by synchronous grouting volume and Tunneling pressure- this paper is based on the actual situation of Changzhou Metro Line 2 Phase I project, combined with the method of anti-floating stability, this paper solves the minimum soil thickness required for the shield tunnel to pass through the river. At the same time. ABAQIJS is used to establish a three-dimensional finite element analysis model to verify the correctness of the calculation results. Calculation based on minimum soil thickness, an effective control method is proposed by comparing the settlement conditions under different grouting volumes and different tunneling pressures. The results show that the minimum required soil thickness of this interval is 9.13 m, and the larger the synchronous grouting amount, the larger the ground settlement, the larger the tunneling pressure and the smaller the ground settlement. The conclusions obtained can give a certain reference for the construction of shield tunnels crossing rivers. [ABSTRACT FROM AUTHOR]

Copyright of Railway Investigation & Surveying is the property of Railway Investigation & Surveying Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Railway Investigation & Surveying is the property of Railway Investigation & Surveying Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Transactions of the Chinese Society of Agricultural Engineering is the property of Chinese Society of Agricultural Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Shanghai University / Shanghai Daxue Xuebao is the property of Journal of Shanghai University (Natural Sciences) Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of China Harbour Engineering is the property of Editorial Office of China Harbour Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Railway bridge is one of the essential components in a high-speed railway system and its health status has a significant impact on operational safety. Pier settlement can induce base plate void and hidden risk for train running. In this paper, the mechanism of the base plate void area due to the pier settlement in the longitudinal connected ballastless track system is analyzed On this basis, the analytic expression of the mapping relationship between pier settlement and void area of the base plate is deduced. The base plate deformation curve is calculated and compared with the finite element model results. Finally, the changing ranges of void areas and the spacing curve between base plate and bridge plate on account of the pier settlement in the longitudinal connected ballastless track system are analyzed. The results show that the analytical model can solve the void problem due to the pier settlement in the longitudinal connected ballastless track system. The void areas and the maximum spacing between base plate and bridge plate increase with the increase of settlement. When the settlement value reaches 35mm, the maximum spacing value reaches 0. 98mm. The bridge surface stiffness has little effect on the void area and the maximum spacing between base plate and bridge plate. [ABSTRACT FROM AUTHOR]

[Introduction] In order to learn from the development experience of the Singapore power market, analyze its settlement and risk management characteristics, and provide suggestions for the construction of power market in South China. [Method] After a ten-day research and study on the Singapore′s power market, the author combined with her own experience in the construction of the power market in the southern region to form this paper. [Result] This paper briefly introduces the general situation of Singapore′s power market, systematically analyzes the settlement mechanism and settlement algorithm of Singapore′s power market, and introduces the characteristics of its power market risk management in detail. [Conclusion] The Singapore power market pays attention to the top-level design of the power market, the sound policies and regulations and rules system, the clear curing of core processes, and the diversification of talent reserves. It is worth learning from the process of building a regional integrated power market in Southern China.

Copyright of Journal of Engineering Geology / Gongcheng Dizhi Xuebao is the property of Journal of Engineering Geology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Based on one typical excavation project of shield working well in Hangzhou where the soft soil was over the hard soil, this paper monitored and analyzed the horizontal displacement of the wall, ground settlement, surrounding building settlement, and strut force during its excavation. The results showed that: with the excavation of the foundation pit in upper soft and lower hard soil layer, the distribution of the horizontal displacement of the wall along the depth of the foundation pit had two forms: single peak and double peak, the maximum horizontal displacement of the wall was between 0.56‰-0.59‰ H (H is the excavation depth of the working well), The maximum horizontal displacement of the wall was about 5 m above the soil-rock interface. The ground settlement curves were mainly in the form of "inverted triangle-shaped" and "spoon-shaped", the sensitive area of the settlement was mainly distributed in the range of about 0.36-0.73 H from the edge of the foundation pit and the maximum settlement was about 1.36‰-2.61‰ H, The excavation phase of the soil below each support was the main growth period of the corresponding strut force. Thereinto, the strut force value of the concrete support was affected by the curing time, and it must be guaranteed to reach 28-day strength before excavation. [ABSTRACT FROM AUTHOR]

Copyright of China Harbour Engineering is the property of Editorial Office of China Harbour Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Guangdong Architecture Civil Engineering is the property of Guangdong Architecture Civil Engineering Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

With the increasingly stringent requirements lor environmental protection in China, the research on dredged soil treatment technology has become a hot spot. A new type of embankment with mud—sand interhedded structure is put forward in this paper. The dredged soil is filled with membrane bag and interhedded with sandy membrane bag, which gradually forms a new stable embankment core structure. Through the finite element simulation results, it is known that after 55 d of consolidation, the maximum displacement of mud—sand interhedded structure is 2.73 in, and the top surface of the mud—sand inteibedded structure is 1.9 in from the back surface. The compression of the mud—sand interhedded structure is mainly occurs in the middle of the body, and the bottom and top are less compressed. The design and construction of the embankment meets the engineering requirements, and it is a feasible and last embankment technology on soft soil foundation. [ABSTRACT FROM AUTHOR]

This paper studied the surface settlement, temperature, and gas production of land-filling pile, and the physical and chemical properties of aged refuse in 5-year-old semi-aerobic and anaerobic landfills. The pile's surface settlement and its volume reduction rate were significantly higher in semi-aerobic than in anaerobic landfill; and the treatment with leachate recycling brought larger uneven settlement than the treatment with water recycling. The temperature of anaerobic landfill pile (25.6 °C) was slightly higher than that of semi-aerobic landfill file (24.8 °C), but the difference was not significant. During land-filling period, the O2 concentration in semi-aerobic landfill pile was significantly higher than that in anaerobic one, while the CH4 concentration was in reverse. After 5 years land-filling, the contents of easily degradable organic matters in aged refuse, such as kitchen refuses and papers, decreased dramatically, while the contents of plastics, glasses, bricks, and woods increased. In addition, the contents of organic matters and nutrients in aged refuse were higher than those in typical southern China soils, and the concentrations of heavy metals except chromium in anaerobic landfill aged refuse were not beyond the grade three of Environmental Quality Standards for Soils (GB 15618-1995). [ABSTRACT FROM AUTHOR]

In order to judge, the bearing safety of homogeneous ground that the heavy forcing plates acted on, static and dynamic outfield tests were carried out. According the static plate loading method, the outfield test that bearing plates simulating the static procedure of heavy forcing plates was performed. By the similarity criterion Π theorem, the pneumatic impact test of reduced proportional plate simulating the dynamic procedure of forcing plate was completed. Based on the outfield tests, the paper studied the S - t curves that express the variety of settlement with time, the P - S/D curves that express the soil settlement correlative relation among bearing plates with different sizes under the corresponding load, the P - S curves under static and dynamic loads as well as the contrast between them. To the homogeneous soil ground in outfield tests, S - t curves indicate that the static load method is reasonable, and P - S/D curves appear a linear proportional relation in the limit load range. The settlement under dynamic load is much less than that under static load. The deformation stiffness under dynamic load is higher than that under static load. The settlement caused by instant dynamic impact can be ignored. [ABSTRACT FROM AUTHOR]