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36 results on '"Cong, Shengyi"'

30. Seismic Soil Liquefaction Mitigation Using Stone Columns for Pile-supported Wharves.

Author

Tang, Liang, Liu, Shuxing, Ling, Xianzhang, Wan, Yijiang, Li, Xuewei, Cong, Shengyi, and Su, Lei

Subjects
STONE columns, SOIL liquefaction, SEISMIC response, RETROFITTING, PERMEABILITY, STONE
Abstract

Stone columns (SCs) can reduce the seismic response of pile-supported wharves in liquefiable sites. A series of parametric studies were conducted to investigate the influence of SC diameter, SC space ratio, SC permeability, and typical earthquake characteristics on the seismic response of pile-support wharves and to assess the SC retrofit effect. The ratio of the SC space and diameter is found to play an important role in reducing the deck displacement. Based on the experimental results, the damage state of a pile support can be restricted to a potentially tolerable level using SCs in different liquefiable sites. Preliminary design suggestions are proposed for improving the seismic response of pile-supported wharves in earthquake-prone regions. [ABSTRACT FROM AUTHOR]

Published
2022
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34. Three-Dimensional Numerical Investigation on the Seepage Field and Stability of Soil Slope Subjected to Snowmelt Infiltration

Author

Hui Li, Liang Tang, Wenqiang Xing, Xinyu Li, Guoyu Li, Cong Shengyi, Xianzhang Ling, and Lin Geng

Subjects
snowmelt infiltration, Water supply for domestic and industrial purposes, three-dimensional modeling, Geography, Planning and Development, Soil science, Fracture mechanics, Hydraulic engineering, Aquatic Science, freeze-thaw cycles, Snow, Biochemistry, Stability (probability), Instability, slope stability, soil crack propagation, Infiltration (hydrology), Snowmelt, Slope stability, Environmental science, TC1-978, Saturation (chemistry), TD201-500, Water Science and Technology
Abstract

Cutting slope failures occur frequently along the high-speed railways in Northeast China during the construction due to snowmelt infiltration. This study addresses this issue by applying a three-dimensional numerical model. The influence of the depth of accumulated snow (ds), daily temperature variation (ΔT), and freeze-thaw (F-T) cycles on the seepage field and stability of cutting slopes is discussed. The results demonstrate that water seepage due to snowmelt infiltration primarily extends through the ground surface by about 10 m. The deep-seated instability is likely to occur under a prolonged and highly accumulated infiltration, while shallow failure is associated with intense, short-duration snowmelt infiltration. The maximum degree of saturation (Sr) and pore-water pressure (PWP) values are observed at the slope toe. Increasing ds and ΔT increase the Sr and PWP due to snowmelt infiltration and thereby decreases cutting slope stability. Compared to the ds and ΔT, the F-T cycle is more likely to cause slope failure. In addition, the F-T cycle also induces the reduction of soil strength and the crack propagation. Overall, the conducted study provided useful help toward the process of safer design for cutting slope along the high-speed railway in seasonally cold regions.

Published
2021

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