基于渗流-应力-损伤耦合的岩溶地区基坑开挖稳定性研究

冯云鹏, 姜谙男, 许梦飞, 虢新平, 闵庆华

doi:10.16411/j.cnki.issn1006-7736.2024.02.018

大连海事大学学报 >

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

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

基于渗流-应力-损伤耦合的岩溶地区基坑开挖稳定性研究

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（1.大连海事大学道路与桥梁工程研究所，辽宁大连 116026；2.中建交通建设集团有限公司，北京100142）

冯云鹏（1997 — ），男，硕士生，研究方向：岩土体多场耦合机理。姜谙男（1971 — ），男，博士，教授，博士生导师， E-mail：jiangannan@163.com。

网络出版日期: 2024-01-30

基金资助

国家自然科学基金（52078093）；大连海事大学优秀博士学位论文培育项目资助（2022YBPY009）

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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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摘要

针对岩溶地区基坑工程施工过程渗流（H）-应力（M）-损伤（D）耦合导致的岩石失稳问题，建立了基于Hoek-Brown强度准则的应力-渗流-损伤耦合模型和算法。首先根据损伤理论引入损伤因子对H-B准则进行修正，给出了应力场、渗流场的控制方程与渗透性演化方程，实现应力-渗流-损伤的完全耦合。然后提出该模型的求解算法，并对比了石灰岩三轴室内试验与模拟计算结果，拟合较好，验证了模型的准确性。最后，将该模型用于大连地铁梭鱼湾南站基坑工程的开挖稳定性分析，分别计算了耦合和非耦合条件下的地表沉降和地下连续墙变形，计算结果表明考虑耦合的变形值会明显大于非耦合的变形值，并且更贴近现场监测数值。同时为确定围岩最小防突层厚度，分别计算防突层2m、4m、6m、8m时的损伤区分布特征，对实际施工时的风险预测具有一定的意义。

关键词： 岩溶地区; 耦合模型; 室内试验; 基坑工程; 溶洞

本文引用格式

冯云鹏, 姜谙男, 许梦飞, 虢新平, 闵庆华 . 基于渗流-应力-损伤耦合的岩溶地区基坑开挖稳定性研究[J]. 大连海事大学学报, 2024 , 50(2) : 168 -176 . DOI: 10.16411/j.cnki.issn1006-7736.2024.02.018

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

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