基坑开挖过程坑侧土体应力路径试验研究  

Stress Pathtriaxial Tests on the Lateral Soil of Foundation Pit during Excavation Process

作　　者：陈志波[1,2,3] 钟理峰 蔡廉锦 季李通 

机构地区：[1]福州大学环境与资源学院资源与城乡建设系,福建福州350116 [2]国土资源部丘陵山地地质灾害防治重点实验室,福建福州350116 [3]地质工程福建省高校工程研究中心,福建福州350116 [4]中建海峡建设发展有限公司,福建福州350003 [5]南京泰克奥科技有限公司,江苏南京210000

出　　处：《防灾减灾工程学报》2016年第6期943-949,共7页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金项目(41102167)资助

摘　　要：随着基坑的开挖,基坑侧壁土体的竖向应力不变而侧向应力减小,侧壁土压力由静止土压力逐步向主动土压力变化。基于基坑开挖前、开挖过程及支护结构作用后坑侧土体的应力变化情况,开展了常规三轴固结不排水剪切试验、K0固结不排水剪切试验、K0固结侧向卸荷试验和不等压固结侧向卸荷不排水剪切试验等多种室内试验,对比分析了不同应力路径条件下土体的应力应变曲线、抗剪强度及孔隙水压力变化特征,总结了基坑开挖过程复杂应力路径下土体的应力应变特征及强度特性。The horizontal stress of the lateral soil of foundation pit was decreased from static earth pressure to active earth pressure with the excavation.Based on the stress change of the lateral soil during the excavation,the four types of tests,including triaxial consolidated undrained shear test,K0-consolidationundrained shear test,the lateral unloading K0-consolidation test and lateral unloading undrained shear test under differential consolidation,was carried out.The stress-strain curves,shear strength and pore water pressure were studied,then the characteristics of stressstrain and strength of soils under complex stress path were summarized.

关 键 词：基坑 开挖卸荷 力学性状 K0固结 应力路径 

分 类 号：TU411[建筑科学—岩土工程]