分步施工及预应力损失对框架预应力锚杆加固多级边坡的影响分析  

Analysis of the influence of step-by-step construction and prestress loss on the reinforcement of multi-stage slope by frame prestressed anchor

作　　者：王邓峮 李晓慧 郭盼盼[3] 叶帅华[2] WANG Deng-qun;LI Xiao-hui;GUO Pan-pan;YE Shuai-hua(HFUT Design Institute(Group)Co.,Ltd.,Hefei 230041,Anhui,China;Key Laboratory of Disaster Mitigation in Civil Engineering of Gansu Province,Lanzhou University of Technology,Lanzhou 730050,Gansu,China;College of Civil Engineering,Hefei University of Technology,Hefei 230009,Anhui,China)

机构地区：[1]合肥工业大学设计院(集团)有限公司,安徽合肥230041 [2]兰州理工大学甘肃省土木工程防灾减灾重点实验室,甘肃兰州730050 [3]合肥工业大学土木与水利工程学院,安徽合肥230009

出　　处：《地基处理》2023年第5期383-390,共8页Journal of Ground Improvement

摘　　要：以实际工程为依托,使用PLAXIS3D有限元分析软件建立分析模型,分析了分步施工及预应力损失对框架预应力锚杆加固多级边坡的影响。首先,对各阶段安全系数变化、位移变化、锚杆轴力变化进行分析,进一步对3种不同施工方案下的安全系数变化、位移变化、锚杆轴力变化进行对比分析;其次,设置预应力损失的工况,对位移变化、偏应变增量变化进行分析。研究结果表明,框架预应力锚杆对边坡的变形控制发挥了显著的作用,同时对分步施工过程中的边坡安全状态也应该给予关注,防止边坡分步施工过程中发生局部破坏;逆次序边开挖边支护的施工方案最为安全可靠;边坡的总位移和偏应变增量都随着预应力的损失而不断增大,两者之间的变化趋势呈现相关性。An numerical model was developed based on a real engineering project using the PLAXIS 3D finite element analysis software to investigate the influence of incremental construction and prestress degradation on multi-stage slope reinforcement employing frame prestressed anchors.Initially,an analysis was performed to examine the variations in safety factors,displacements,and axial forces in the anchors across various stages.Moreover,a comparative assessment was conducted on the variations in safety factors,displacements,and anchor axial forces within three distinct construction scenarios.Subsequently,scenarios involving prestress loss were introduced,and an analysis was conducted to investigate alterations in displacement and incremental strain.The research results demonstrate the pivotal role of frame prestressed anchors in mitigating slope deformations.Additionally,it is crucial to consider the safety of slope during incremental construction to avert localized damage.Among the construction schemes,the strategy of reverse sequence excavation and support is determined to be the most secure and dependable.With prestress loss,both the total slope displacement and the incremental strain increase,revealing a correlated trend.

关 键 词：框架预应力锚杆 分布施工 数值模拟 预应力损失 安全系数 锚杆轴力 

分 类 号：TU43[建筑科学—岩土工程]