Geomechanics and Engineering

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A displacement controlled method for evaluating ground settlement induced by excavation in clay

  • Qian, Jiangu (Department of Geotechnical Engineering, Tongji University) ;
  • Tong, Yuanmeng (Department of Geotechnical Engineering, Tongji University) ;
  • Mu, Linlong (Department of Geotechnical Engineering, Tongji University) ;
  • Lu, Qi (Hangzhou Qianjiang New City Construction Development Co., Ltd.) ;
  • Zhao, Hequan (China Railway 14th Bureau Group Shield Engineering Co., Ltd)
  • Received : 2018.10.09
  • Accepted : 2020.01.28
  • Published : 2020.02.25
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Abstract

Excavation usually induces considerable ground settlement in soft ground, which may result in damage of adjacent buildings. Generally, the settlement is predicted through elastic-plastic finite element method and empirical method with defects. In this paper, an analytical solution for predicting ground settlement induced by excavation is developed based on the definition of three basic modes of wall displacement: T mode, R mode and P model. A separation variable method is employed to solve the problem based on elastic theory. The solution is validated by comparing the results from the analytical method with the results from finite element method(FEM) and existing measured data. Good agreement is obtained. The results show that T mode and R mode will result in a downward-sloping ground settlement profile. The P mode will result in a concave-type ground settlement profile.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China, Central Universities

The authors gratefully acknowledge financial support by the National Natural Science Foundation of China (Grand No. 51738010), the National Key R&D Program (Grant No. 2016YFC0800200), Shanghai Science and Technology Committee Rising-Star Program(19QC1400500) and the Fundamental Research Funds for the Central Universities(22120190220).

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