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4. Causes of cement concrete pavement diseases in high-cold and high-altitude areas and progress in repairing techniques

Author

Hou, Tiejun

Subjects
High-cold and high-altitude areas, cement concrete, disease, repair, Transportation Engineering
Abstract

The climatic characteristics of high-cold and high-altitude areas are low temperature, large temperature differences, and strong ultraviolet radiation. This paper analyzes the causes of cement concrete pavement diseases in high-cold and high-altitude areas and summarizes the common disease types of cement concrete pavements in high-cold and high-altitude areas. Moreover, new repair techniques to improve the maintenance quality of cement concrete pavements in high-cold and high-altitude areas are introduced.

Published
2022

6. Application of gas drainage technology with separated sources in steep thick seam

Author

CHEN Xinrun, HOU Tiejun, and ZHAO Yunfeng

Subjects
steep thick seam, gas overrunning, goaf, gas drainage with separated sources, crossing borehole, Mining engineering. Metallurgy, TN1-997
Abstract

In order to solve problems of gas overrunning in No.735 Coal Mining Face of Dahuangshan Mine, a gas drainage technology with separated sources was put forward based on analysis of main sources of gas emission of the coal mining face, that is, gas in goaf is drainaged directly through crossing borehole by optimizing drainage pipelines, so as to realize gas drainage in goaf and mining seam separately. The application results show that gas volume fraction in air return flow is 0.36%-0.46%, gas volume fraction in upper corner is 0.4%-0.6%, and gas drainage average rate is 59.17% after the gas drainage conducted with separated sources.

Published
2014
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