基坑支护中锚杆预应力损失机理分析  

Analysis of Prestress Losses of Anchors in Foundation Pits

作　　者：史哲[1] 马平[2] 张晓科[2] 孙强[2] 邹登亮 

机构地区：[1]北京市地质工程公司,北京100039 [2]中国科学院地质与地球物理研究所,北京100029

出　　处：《城市地质》2006年第2期34-37,共4页Urban Geology

摘　　要：目前基坑支护工程中,预应力锚杆加固技术已经得到广泛应用,但对于锚杆锁固以后的预应力变化规律还没有进行深入探讨研究,尤其是针对基坑侧壁为土质边坡的情况。针对锚杆锁固后,预应力的短期内损失和长期运行的稳定性缺乏全面的认识。通过对基坑锚杆预应力变化的系统监测和分析,揭示了锚杆预应力在运行过程中预应力变化的3个不同阶段,并分析了相应的作用因素。Presently, the reinforcing technology of prestressed anchors has already been widely used in foundation pit supporting projects. However, the rule of prestress changes after the anchor is locked has not been thoroughly studied, especially when the foundation sidewall is a soil slope. The short-term prestress losses and the stability of long-term operation are not clearly understood. This paper, based on system monitoring and analysis of the prestress changes, revealed the three phases of the changes (Phase I, instantaneous losses of load during the lock of operation; Phase II, the load growing slowly; Phase III, the load is almost uniform), and dis-cussed the corresponding incurring factors.

关 键 词：基坑支护工程 锚杆预应力 预应力损失 机理分析 预应力变化 应力变化规律 预应力锚杆 运行过程 系统监测 土质边坡 探讨研究 加固技术 基坑锚杆 稳定性 认识 侧壁 

分 类 号：TU942[建筑科学—建筑技术科学]