Study on slope stability and reinforcement measures of an earth-rock cofferdam on deep overburden foundation

2018 International Conference on Civil, Architecture and Disaster Prevention

土木建筑工程

Ayiheng, Haerheng^1^2 ; Cheng, Jing^1^2 ; Pan, Jiangyang^3 ; Zhang, Lei^1

Research Center on Levee Safety and Disaster Prevention, Ministry of Water Resources of PRC, Zhengzhou, Henan

450003, China^1

Colleage of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing, Jiangsu

210098, China^2

Hydro China Zhongnan Engineering Corporation Limited, Power Construction Corporation of China and Hydro China Corporation, Changsha, Hunan

410044, China^3

关键词: Anti-sliding pile;    Complex geological condition;    Deep overburdens;    Foundation pit excavations;    Foundation pits;    Reinforcement measures;    Strength reduction method;    Vibro replacement;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/218/1/012004/pdf
DOI  :  10.1088/1755-1315/218/1/012004

学科分类：土木及结构工程学

来源: IOP

【 摘 要 】

Slope stability and reinforcement measures of an earth-rock cofferdam on deep overburden foundation are studied in the paper. Slope stability is analysed by using FEM strength reduction method, considering seepage, based on ABAQUS. Two different reinforcement measures are taken: vibro-replacement stone columns and concrete anti-sliding piles. As a result of the research, conclusions are made: overflow happens on the slope near bottom of the foundation pit in layer Qal-1, where permeability coefficient is quite large compared to that of other layers; Both the vibro-replacement stone columns and concrete anti-sliding piles increase the stability; Vibro-replacement stone columns should be used as the final reinforcement measure, since vibro-replacement stone columns can be constructed before the foundation pit excavation and they can also conduce to drainage in foundation pit. This deep overburden foundation is characterized by complex geological conditions and poor mechanical properties. Therefore, the successful construction of the project has a certain reference and application value.