桩锚回收过程中基坑和地下室的力学特性  

Mechanical Characteristics of Foundation Pits and Basements During Pile-Anchor Recycle Process

作　　者：郑全明 张西文[2,3] 刘俊岩 刘燕[2,3] 何东林[1] 王杨 冯小冬 ZHENG Quanming;ZHANG Xiwen;LIU Junyan;LIU Yan;HE Donglin;WANG Yang;FENG Xiaodong(Shandong Bureau of China Metallurgical Geology Bureau,Jinan 250001,Shandong,China;School of Civil Engineering and Architecture,University of Jinan,Jinan 250022,Shandong,China;The Engineering Technology Research Center for Urban Underground Engineering Supporting and Risk Monitoring of Shandong Province,University of Jinan,Jinan 250022,Shandong,China)

机构地区：[1]中国冶金地质总局山东局,山东济南250001 [2]济南大学土木建筑学院,山东济南250022 [3]济南大学山东省城市地下工程支护及风险监控工程技术研究中心,山东济南250022

出　　处：《济南大学学报（自然科学版）》2022年第1期16-20,共5页Journal of University of Jinan(Science and Technology)

基　　金：国家自然科学基金项目(51979122);中国冶金地质总局山东局2018年科技研发项目(SDYJ-KY202010);山东省重点研发计划项目(2019GSF111031)。

摘　　要：为了研究可回收基坑支护体系在回收过程中基坑和地下室结构所受的土压力和变形特性,采用有限元软件Plaxis建立基坑桩锚回收体系模型,采用硬化土小应变模型模拟基坑周围土体,通过9个施工步序模拟桩锚回收的过程。结果表明:锚杆回收过程中,支护桩坑内位移增大,所受的土压力减小至接近主动土压力;钢管桩回收后,地下室外墙所受的土压力增大,所受的弯矩、剪力增大;桩锚体系回收过程中,基坑外土体沉降变形增大;当基坑周边对变形要求严格时,需要充分考虑桩锚回收期坑外地表的变形情况。To study earth pressure and deformation characteristics of foundation pit and basement structures during recycle process of recyclable foundation pit support systems,a pile-anchor recycle system model was established by using finite element software Plaxis.Soil around foundation pits was simulated by using a hardening soil small strain model.Nine construction procedures were used to simulate pile-anchor recycle process.The results show that during anchor recycle process,the supporting pile underground displacement increases,and the earth pressure experienced decreases to close to active earth pressure.After steel pipe piles are recovered,the earth pressure on basement external walls increases,resulting in the increase of bending moment and shear force.During pile-anchor system recycle process,the settlement deformation of soil outside foundation pits increases.When deformation requirements around foundation pits are strict,it is necessary to fully consider the deformation of surface outside pits during pile-anchor recycle period.

关 键 词：可回收桩锚体系 土压力 变形特性 地下室外墙 地表沉降 

分 类 号：TU91[建筑科学—建筑理论]