承压水作用下岩质地层基坑抗突涌安全厚度研究  

Research on safety thickness to resist basal inrush failure in rock ground excavations subjected to a confined aquifer

作　　者：王洪涛 李建华 殷允腾 张红军 宣兆腾 赵明珠 WANG Hongao;LI Jianhua;YIN Yunteng;ZHANG Hongjun;XUAN Zhaoteng;ZHAO Mingzhu(School of Civil Engineering,Shandong Jianzhu University,Jinan 250101,China;Key Laboratory of Building Structural Retrofitting and Underground Space Engineering(Shandong Jianzhu University),Ministry of Education,Jinan 250101,China;Jinan Urban Construction Group Co.,Ltd,Jinan 250031,China;Shandong Institute of Geological Sciences,Jinan 250013,China)

机构地区：[1]山东建筑大学土木工程学院,山东济南250101 [2]山东建筑大学建筑结构加固改造与地下空间工程教育部重点实验室,山东济南250101 [3]济南城建集团有限公司,山东济南250031 [4]山东省地质科学研究院,山东济南250013

出　　处：《建筑结构学报》2024年第6期213-223,共11页Journal of Building Structures

基　　金：国家自然科学基金项目(52374093);中国博士后科学基金项目(2022M711314);山东省自然科学基金项目(ZR2022ME088);济南市科研带头人工作室项目(202333054)。

摘　　要：受下部承压水作用,基坑开挖后坑底发生突涌破坏是普遍存在的工程灾害。为保障基坑安全,设置足够的坑底厚度是阻止此类破坏的关键。基于塑性上限定理,将坑底突涌破坏范围分为上部被动区与下部剪切区两部分,分析了岩质地层中基坑突涌破坏机制。进一步,基于Hoek-Brown强度准则,推导了突涌破坏面曲线方程解析表达式,并给出了基坑临界安全厚度与承压水压力的理论预测公式。在此基础上,分析得到了被动区厚度、承压水压力、岩体强度参数等对基坑安全厚度及破坏范围的影响规律,并与现有研究方法、数值模拟得到的结果进行对比,验证了所提出方法的有效性。结果显示,基坑临界安全厚度与承压水压力、岩体经验参数等正相关,与被动区厚度、经验参数、岩体抗压强度、抗拉强度和重度等负相关。The water inrush or instability failure at the deep excavation base is a common engineering disaster subjected to the action of lower confined water.In order to ensure the basal safety in deep excavations,setting enough safety thickness is the key to prevent such failure.Based on the plastic upper-bound analysis theory,the basal failure range was classified into upper passive zone and lower shear zone in this paper,and a basal inrush failure mechanism for excavations in rock ground was constructed.Then,based on the Hoek-Brown strength criterion,the analytical solutions for the basal failure surface equation,critical safety thickness and critical confined water pressure were derived.On this basis,the influence laws of passive-zone thickness,confined water pressure,rock-mass parameters and other factors on the basal safety thickness and failure range were obtained,and the validity of the proposed method was verified through a comparison with the existing research works and numerical simulation results.The research shows that the critical safety thickness is positively correlated with confined water pressures and rock empirical parameter,and negatively correlated with passive-zone thicknesses,rock empirical parameter,rock compressive strength,rock tensile strength and unit weight.

关 键 词：基坑 突涌 承压水 HOEK-BROWN强度准则 上限定理 安全厚度 

分 类 号：TU753[建筑科学—建筑技术科学]