桂平航电扩机工程基坑边坡稳定性评价  

Stability Evaluation of Foundation Pit Slopes in the Guiping Navigation Hydropower Station Expansion Project

作　　者：黎东晓 韦海勇 徐李达 荣冠[3] LI Dong-xiao;WEI Hai-yong;XU Li-da;Rong Guan(Guangxi Zhuang Autonomous Region Water Conservancy Technology Center,Nanning 530015,Guangxi,China;Guangxi Water and Power Design Institute Co.,Ltd,Nanning 530023,Guangxi,China;State Key Laboratory of Water Resources Engineering and Management,Wuhan University,Wuhan 430072,Hubei Province,China)

机构地区：[1]广西壮族自治区水利技术中心,广西南宁530015 [2]广西壮族自治区水利电力勘测设计研究院有限责任公司,广西南宁530023 [3]武汉大学水资源工程与调度全国重点实验室,湖北武汉430072

出　　处：《中国农村水利水电》2024年第7期164-169,共6页China Rural Water and Hydropower

基　　金：广西重点研发计划(桂科AB18126046)。

摘　　要：预应力锚索-灌注桩等组合支护结构能够有效地发挥各自优势,在基坑加固的应用中越来越广泛。本研究采用三维有限差分方法模拟桂平航电扩机工程基坑分级开挖支护全过程,分析预应力锚索、锚杆、抗滑桩组合支护结构的受力与变形特性,并通过监测数据验证了数值模拟的合理性。结果表明,对于上部为土质、下部为岩质的基坑边坡,采用抗滑桩和预应力锚索组合结构嵌固到下部基岩可有效控制上部土质边坡的塑性破坏和变形,结合预应力锚索和随机锚杆可有效地遏制下部岩质边坡侧向位移,桩锚组合支护结构对土岩复合地层基坑具有良好的适用性和加固效果。Prestressed anchor-cable and cast-in-place pile combination support structures effectively leverage their respective advantages and are increasingly applied in foundation pit reinforcement.This study employs the three-dimensional finite difference method to simulate the entire process of staged excavation and support for the Guiping Navigation Hydropower Station Expansion Project foundation pit.The study analyzes the stress and deformation characteristics of the combined support structure of prestressed anchor cables,anchor rods,and an⁃ti-slide piles,and validates the rationality of the numerical simulation through monitoring data.The results indicate that for foundation pit slopes with soil at the top and rock at the bottom,embedding a combined structure of anti-slide piles and prestressed anchor cables into the underlying bedrock can effectively control the plastic failure and deformation of the upper soil slope.Additionally,combining prestressed anchor cables with random anchor rods can effectively curb the lateral displacement of the lower rock slope.The pile-anchor combination support structure exhibits excellent applicability and reinforcement effects for foundation pits in mixed soil and rock strata.

关 键 词：组合支护 基坑 数值模拟 变形分析 

分 类 号：TV523[水利工程—水利水电工程] TU473.2[建筑科学—结构工程]