加筋土挡墙压实应力数值模拟分析

doi:10.13722/j.cnki.jrme.2019.0901

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摘要基于数值建模类型II(2D)，提出并验证考虑不同带载宽度的三维动态压实模型。同时，引入一种考虑中国规范的压实应力挡墙计算公式，并探讨三维动态荷载移动方式。先通过等效荷载加载方式的选取，根据筋材应变、面板侧向变形、墙背土压力和基底压应力分布讨论不同带载宽度对挡墙的影响，再通过压实应力影响深度给计算公式提供验证。分析表明：等效荷载移动方式一比方式二、三的计算结果更加接近测量值；各层筋材应变变化趋势基本相同，均呈现两处“波峰”，第一处位于面板背部，第二处由于剪切应变集中(潜在破裂面)所引起的峰值荷载点；压实建模的类型不会影响墙底垂直压应力的分布；只有当挡墙附加荷载超过压实荷载时，压实应力的影响才会消散。同时，对于不同压实应力、筋材和土体特性，对应压实影响深度也不同；合理的带状荷载宽度(B)对有效预测挡墙内部应力变化情况影响很大。

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	李丽华
	李行
	肖衡林
	刘一鸣
	胡智
	严寒

关键词 ：土力学, 加筋土挡墙, 数值模型, 压实应力, 带载宽度

Abstract：Based on the literature numerical modeling type II(2D)，a three-dimensional dynamic compaction model considering different load widths is proposed and verified. At the same time，a calculation formula of compaction stress retaining wall considering Chinese norms was introduced，and the three-dimensional dynamic load moving mode was discussed. First，through the selection of equivalent load loading method，the influence of different load widths on the retaining wall is discussed according to the strain of the reinforcement，the lateral deformation of the panel，the soil pressure behind the wall and the compressive stress distribution of the base. And the depth of compaction stress is used to provide verification for the calculation formula. The analysis shows that the calculation method of the equivalent load movement method is closer to the measured value than the second and third methods；the strain change trend of each layer is basically the same，showing two peaks，the first one is located at the back of the panel，the second place Peak load point due to shear strain concentration(potential fracture surface)；the type of compaction modeling does not affect the distribution of vertical compressive stress at the bottom of the wall；only when the additional load of the retaining wall exceeds the compaction load，the compaction stress the effect will dissipate. At the same time，for different compaction stresses，ribs and soil properties，the corresponding compaction depth is also different；The strip load width(B) has obvious impaction on the internal stress prediction of the retaining wall.

Key words： soil mechanics reinforced earth retaining wall numerical model compaction stress load width

引用本文:

李丽华，李行，肖衡林，刘一鸣，胡智，严寒. 加筋土挡墙压实应力数值模拟分析[J]. 岩石力学与工程学报, 2020, 39(S1): 3130-3138.
LI Lihua，LI Hang，XIAO Henglin，LIU Yiming，HU Zhi，YAN Han. Numerical simulation of compaction stress for the analysis of reinforced earth retaining wall. , 2020, 39(S1): 3130-3138.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2019.0901 或 http://rockmech.whrsm.ac.cn/CN/Y2020/V39/IS1/3130

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