| 刚性挡土墙后轻量土主动土压力特性模型试验研究 |
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| 引用本文： | 张建成,侯天顺,刘浩钰,杨诚,骆亚生.刚性挡土墙后轻量土主动土压力特性模型试验研究[J].西北地震学报,2023(6):1397-1407. |
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| 作者姓名： | 张建成 侯天顺 刘浩钰 杨诚 骆亚生 |
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| 作者单位： | 西北农林科技大学 水利与建筑工程学院, 陕西 杨凌 712100;陕西省引汉济渭工程建设有限公司, 陕西 西安 710011 |
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| 基金项目： | 国家自然科学基金项目(51509211)；中国博士后基金项目(2016M602863)；陕西省留学人员科技活动择优资助项目(2018031)；陕西省社会发展科技攻关项目(2015SF260)；陕西省博士后基金项目(2017BSHYDZZ50)；陕西省自然科学基础研究计划引汉济渭联合基金项目(2021JLM-51)；西安市岩土与地下工程重点实验室开放基金项目(XKLGUEKF21-02)；中央高校基本科研业务费专项资金项目(2452020169) |
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| 摘 要： | 为了研究轻量土的主动土压力特性，通过开展大比尺刚性挡土墙模型试验，采用人工控制挡土墙位移的方式，分析轻量土作为墙后填土时的主动土压力分布规律。结果表明：轻量土的侧向土压力随着挡墙位移量的增加先降低后逐渐趋于稳定，侧向土压力在挡墙位移量为3 mm时初步达到稳定状态，对比发现轻量土的主动土压力显著小于重塑黄土，这表明轻量土可以有效降低墙背主动土压力。轻量土的主动土压力系数处于0～0.16之间，沿着挡墙分布较为稳定，而重塑黄土主动土压力系数介于0～0.57之间，显著大于轻量土的主动土压力系数。经朗肯理论值与模型试验值对比分析，发现轻量土的朗肯主动土压力小于试验值，理论值与试验值之间的绝对误差处于0～6.32 kPa之间，其在实际工程中可以忽略不计。鉴于模型试验中墙背与填土之间存在一定的摩擦，朗肯理论在计算轻量土的主动土压力时仍较为准确。通过模型试验研究和传统理论分析，揭示了轻量土的主动土压力特性，对于完善轻量土土压力理论具有重要意义。
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| 关 键 词： | 轻量土 主动土压力 主动土压力系数 模型试验 |
| 收稿时间： | 2022/8/4 0:00:00 |
Model test of the active earth pressure characteristics of lightweight soil behind rigid retaining walls |
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| ZHANG Jiancheng,HOU Tianshun,LIU Haoyu,YANG Cheng,LUO Yasheng.Model test of the active earth pressure characteristics of lightweight soil behind rigid retaining walls[J].Northwestern Seismological Journal,2023(6):1397-1407. |
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| Authors: | ZHANG Jiancheng HOU Tianshun LIU Haoyu YANG Cheng LUO Yasheng |
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| Institution: | College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling 712100 , Shaanxi, China;Hanjiang\|to\|Weihe River Valley Water Diversion Project Construction Co., Ltd., Shaanxi Province, Xi''an 710011 , Shaanxi, China |
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| Abstract: | To study the active earth pressure characteristics of lightweight soil, we conducted model tests on a large-scale rigid retaining wall. The displacement of the retaining wall was controlled to analyze the active earth-pressure distribution law of lightweight soil. The results show that the lateral earth pressures of lightweight soil first decreased and then gradually stabilized with increasing retaining wall displacement. When the displacement of the retaining wall was 3 mm, the lateral earth pressure of lightweight soil reached a stable state. The active earth pressure of lightweight soil was considerably less than that of remolded loess, indicating that the former can effectively reduce active earth pressure on the back of walls. The active-earth-pressure coefficient of lightweight soil ranged between 0 and 0.16, and a slight change range was observed along the height of the retaining wall. However, the active earth-pressure coefficient of the remolded loess was 0-0.57, which is evidently larger than that of lightweight soil. According to the comparative analysis of Rankine''s theoretical and model test values, the Rankine active earth pressure of lightweight soil is less than the test value. The absolute error between the theoretical and experimental values was 0-6.32 kPa, which can be ignored in practical engineering. A certain friction existed between the wall back and fillings in the model tests. Therefore, Rankine''s theory remains accurate in the calculation of the active earth pressure of lightweight soil. The active earth pressure characteristics of lightweight soil, which are important for improving the earth pressure theory of lightweight soil, were revealed by model tests and traditional theoretical analysis. |
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