Monitoring and numerical simulation of deep foundation pit of a subway station in Lanzhou
YE Shuai-hua1, 2, 3, DING Sheng-huan1, 2, GONG Xiao-nan3, GAO Sheng4, CHEN Chang-liu5
1. Key Laboratory of Disaster Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology, Lanzhou 730050, China; 2. Western Center of Disaster Mitigation in Civil Engineering, Ministry of Education, Lanzhou University of Technology, Lanzhou 730050, China; 3. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China; 4. China Railway Frist Survey and Design Institute Group Co., Ltd., Xi'an 710043, China; 5. China Mobile Group Gansu Co., Ltd., Lanzhou 730030, China
Abstract：Based on the foundation pit of a subway station in Lanzhou, the horizontal and vertical displacements of pile top, surface settlement, axial force of steel supports and groundwater level of foundation pit during construction are monitored, and the monitoring data are analyzed. The monitoring results show that the horizontal displacement of pile top gradually changes from small to large and the vertical one of pile top increases with the increase of excavation depth, and the axial force of steel supports in the excavation process tends to be stable. Finally, the finite element software is used to simulate the excavation of the foundation pit. The simulated and monitoring results are compared. The results show that the numerical simulations and the monitoring results basically have the same variation rules. It is proved that the combined structure of steel tube bored pile and support is safe and feasible, and it ensures and maintains the stability of the foundation pit. This study may provide effective and reliable reference for the construction of similar foundation pits.
叶帅华, 丁盛环, 龚晓南, 高升, 陈长流. 兰州某地铁车站深基坑监测与数值模拟分析[J]. 岩土工程学报, 2018, 40(S1): 177-182.
YE Shuai-hua, DING Sheng-huan, GONG Xiao-nan, GAO Sheng, CHEN Chang-liu. Monitoring and numerical simulation of deep foundation pit of a subway station in Lanzhou. Chinese J. Geot. Eng., 2018, 40(S1): 177-182.
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