预应力锚索格构梁支护机理及现场试验研究  

Research on the Reinforcement Mechanism of Prestressed Anchor Cable Lattice Beam and Its Site Verification

作　　者：黄昌乾[1] 沈宇鹏[2] 赵久欢[3] 毛凌峰[2] 颜欣桐 何永贵[2] 

机构地区：[1]中航勘察设计研究院有限公司,北京100098 [2]北京交通大学,北京100044 [3]贵州省交通规划勘察设计研究院股份有限公司,贵阳550081

出　　处：《铁道工程学报》2015年第1期73-78,共6页Journal of Railway Engineering Society

基　　金：国家自然科学基金(41271072);中央高校基本科研业务费(2011JBZ009)

摘　　要：研究目的:论文详细分析了预应力锚索格构梁挡墙的支护机理;通过对北京市门头沟该类型挡墙应力应变的长期监测,研究施工与服役期间墙后土压力、格构梁受力和锚索预应力损失等变化特征,完善该类型挡墙工作机理。研究结论:(1)填土加载是测试点土压力变化最主要的原因,第一次回填加载的影响最大,后期回填加载影响较小;(2)由于锚索的存在,墙后侧向土压力的分布不是简单矩形、梯形、三角形,变化曲线呈现"W"型;(3)侧竖向压力比值K与埋深有关,并出现了大于1的情况;(4)锚索会出现拉应力随着时间而减小的松弛现象,对于永久性工程的锚索格构梁需要进行再次张拉提高其拉力;(5)本论文成果能为类似预应力锚索格构梁支护工程的设计维修提供参考。Research purposes： In this paper, the reinforcement mechanism of the prestressed anchor cable lattice beam is analyzed in detail. Through long - term monitoring test in the district of Mentougou in Beijing, the change characteristic of soil pressures, the stresses of lattice beams and the cable prestress loss are studied. Research conclusions： （ 1 ） The main reason to the dramatic change of soil pressure is the filling load. The change of soil pressure is the most dramatic in the first loading, and the change is not obvious the late loading. （2） The distribution of lateral soil pressure is not a simple rectangular, trapezoidal or triangular, and the relation of soil stress and time present the “W” type curves, for the existence of anchor cable. （ 3 ） The K value （ ratio between the lateral pressure to vertical pressure） is related to the burying depth, and is greater than 1.0 in some cases. （4） The tensile stress will decreases over time in the anchor cable, and the re -tensioning the anchor tension is necessary for the permanent retaining wall. （5） The results can provide helpful references for the designer or maintenance staff to designor conserve the same retaining.

关 键 词：预应力锚索格构梁 竖向土压力 侧向土压力 K值 张拉 

分 类 号：TU452[建筑科学—岩土工程]