锚杆回收期的支护设计模式研究  

Research on Design Mode of Support in Period of Anchor Bolt Recycle

作　　者：刘燕[1,2] 刘俊岩[1,2] 郑全明 刘晨阳 LIU Yan;LIU Junyan;ZHENG Quanming;LIU Chenyang(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;Shandong Bureau of China Metallurgical Geology Bureau,Jinan 250001,Shandong,China)

机构地区：[1]济南大学土木建筑学院,山东济南250022 [2]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 [3]中国冶金地质总局山东局,山东济南250001

出　　处：《济南大学学报（自然科学版）》2022年第1期1-9,共9页Journal of University of Jinan(Science and Technology)

基　　金：国家自然科学基金项目(51979122);济南市科技发展计划社会民生重大专项(201704140)。

摘　　要：为了研究锚杆回收时支护体系的变形和稳定性,引入非线性土压力理论,探讨坑内回填土和已施工完成的结构对基坑变形和稳定性的作用,建立锚杆回收期的修正弹性杆系有限元模型,并利用实际基坑工程监测数据和数值模拟验证模型的准确性。结果表明:在锚杆回收过程中,肥槽内回填土和内部结构施工到一定程度后才能抵消锚杆拆除对基坑稳定性的削减作用;如果未回填或结构施工不到位,则导致基坑过大的变形,甚至失稳。To research deformation and stability of support systems when anchor bolts were recovered,nonlinear earth pressure theory was introduced to discuss effect of backfill in pit and completed structure on excavation deformation and stability.A modified elastic bar finite element model in period of anchor bolt recycle was established.Accuracy of the model was verified by using actual excavation engineering monitoring data and numerical simulation.The results show that in the process of anchor bolt recycle,only when enough backfill and internal structure are completed in construction,can weakening effect of excavation stability caused by anchor bolt demolition be compensated.If there is no backfill or structure construction is not enough,it will lead to excessive deformation and even instability of excavation.

关 键 词：基坑支护 锚杆回收设计 弹性杆系模型 

分 类 号：TU43[建筑科学—岩土工程]