【作者】 史哲； 马平； 张晓科； 孙强； 邹登亮；

【Author】 SHI Zhe~①MA Ping~②ZHANG Xiaoke~②SUN Qiang~②ZOU Dengliang~①(①Beijing Geo-Engineering Company,Beijing 100039)(②Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029)

【机构】 北京市地质工程公司； 中国科学院地质与地球物理研究所；

【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。更多还原

【Abstract】 Presently,the pre - stressed anchor already has been obtained widespread application for the foundation pits supports project.However,the rule of pre - stress changes after anchor is locked have not been researched thoroughly;especially when the foundation sidewall is soil slope.The rule of long time and short time pre - strssing losses is not awared clearly.Monitoring data shows that the load changes with time can be described as three phase.PhaseⅠ,instantaneous losses of load during the lock of operation.PhaseⅡ,,load slowly growth.In phaseⅢ,the load is almost uniform.更多还原