Research on Safety Evaluation Method for Foundation Pit Based on Yield Approach Index

doi:10.3973/j.issn.2096-4498.2018.10.008

Tunnel Construction ›› 2018, Vol. 38 ›› Issue (10): 1653-1659.DOI: 10.3973/j.issn.2096-4498.2018.10.008

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Research on Safety Evaluation Method for Foundation Pit Based on Yield Approach Index

GUO Shuxun¹, ZHENG Shijie¹, WANG Jinman¹, YANG Rui¹, ZHENG Shuai^{2, *}, JIANG Annan², KONG Huichuan²

(1. CCCC Tunnel Engineering Company Limited, Beijing 100102, China; 2.College of Transportation Engineering, Dalian Maritime University, Dalian 116026, Liaoning, China)

Received:2017-12-31 Revised:2018-04-03 Online:2018-10-20 Published:2018-10-26

Abstract

Abstract:

The dangerous zones of surrounding soil which are not in plastic state cannot be effectively divided during foundation pit excavation. Hence, the yield approach index (YAI) is used to evaluate the regional safety of the foundation pit. The computing program is compiled based on language fish and solved by software FLAC3D. And then the results obtained are compared with plastic zone distribution obtained by finite difference method and the results of vertical displacement of rock and soil. Finally, the safety state of surrounding soils of foundation pit is calculated based on the concept of YAI; and the distribution and variation tendency of YAI of surrounding soil during foundation pit excavation are obtained. The results show that the YAI method can effectively express the calculation results of finite difference method, on the basis of which the YAI of nonplastic zone can be solved and the dangerous zone of foundation pit can be effectively divided. The results can provide reference for safety evaluation of foundation pit.

Key words: foundation pit, yield approach index (YAI), dangerous zone, safety evaluation

CLC Number:

U 45

GUO Shuxun, ZHENG Shijie, WANG Jinman, YANG Rui, ZHENG Shuai, JIANG Annan, KONG Huichuan. Research on Safety Evaluation Method for Foundation Pit Based on Yield Approach Index[J]. Tunnel Construction, 2018, 38(10): 1653-1659.

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Research on Safety Evaluation Method for Foundation Pit Based on Yield Approach Index

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