Study on excavation stability of foundation pit in Karst area based on hydro-machine-damage coupling

FENG Yunpeng, JIANG Annan, XU Mengfei, GUO Xinping, MIN Qinghua

doi:10.16411/j.cnki.issn1006-7736.2024.02.018

Journal of Dalian Maritime University >

2024 , Vol. 50 >Issue 2: 168 - 176

DOI: https://doi.org/10.16411/j.cnki.issn1006-7736.2024.02.018

Study on excavation stability of foundation pit in Karst area based on hydro-machine-damage coupling

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(1.Institute of Road ang Bridge Engineering,Dalian Maritime University,Dalian 116026,China;2.China Construction Transportation Construction Group Co., LTD, Beijing 100142,China)

Online published: 2024-01-30

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Abstract

Aiming at the rock instability caused by hydro(H)-machine(M)-damage(D) coupling during the construction process of foundation pit engineering in karst area, the stress-seepage-damage coupling model and algorithm based on Hoek-Brown strength criterion are established. Firstly, according to the damage theory, the H-B strength criterion was modified by introducing damage factor, and the governing equations of stress field and seepage field and permeability evolution equation were given to realize the complete coupling of stress, seepage and damage. Then, a solution algorithm for the model was provided, and the results of triaxial indoor tests and simulation calculations of limestone were compared, which showed good fitting and verified the accuracy of the model. Finally, the model was used for the excavation stability analysis of the foundation pit project of the Suoyuwan South Station of Dalian Metro, and the surface settlement and underground continuous wall deformation under the coupling and non-coupling conditions were calculated respectively. The calculation results show that the deformation value considering the coupling is significantly greater than the uncoupling, and it is closer to the field monitoring value. At the same time, in order to determine the minimum thickness of the anti-outburst layer of the surrounding rock, the distribution characteristics of the damage area at 2m, 4m, 6m and 8m of the anti-outburst layer were calculated, which has certain significance for the risk prediction during actual construction.

Key words： karst area; coupling model; indoor test; foundation pit engineering; karst caves

Cite this article

FENG Yunpeng, JIANG Annan, XU Mengfei, GUO Xinping, MIN Qinghua . Study on excavation stability of foundation pit in Karst area based on hydro-machine-damage coupling[J]. Journal of Dalian Maritime University, 2024 , 50(2) : 168 -176 . DOI: 10.16411/j.cnki.issn1006-7736.2024.02.018

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