预应力锚索格构梁支护机理及现场试验研究

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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。

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	黄昌乾1 沈宇鹏2 赵久欢3 毛凌峰2 颜欣桐2 何永贵2

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

Abstract：Abstract：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 design or conserve the same retaining.
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Key words： Key words: lattice beam with prestressed anchor cable vertical earth pressure lateral earth pressure K value tension

基金资助:

国家自然科学基金（41271072）；中央高校基本科研业务费（2011JBZ009）
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作者简介: 黄昌乾，1972年出生，男，教授级高级工程师，注册土木工程师（岩土）。

引用本文:

黄昌乾1 沈宇鹏2 赵久欢3 毛凌峰2 颜欣桐2 何永贵2. 预应力锚索格构梁支护机理及现场试验研究[J]. 铁道工程, 2015, 32(1): 73-.

链接本文:

http://tdgcxb.crec.cn/CN/ 或 http://tdgcxb.crec.cn/CN/Y2015/V32/I1/73