基于离心模型试验的黄土高填方沉降影响因素分析

doi:10.13722/j.cnki.jrme.2018.0752

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摘要使用复合型岩土离心试验机进行黄土高填方地基沉降模型试验，模拟沟谷地形中填筑体施工期和工后沉降过程，并系统研究黄土高填方沉降的影响因素。试验成果表明：施工速率、填方高度、沟谷形状、填筑压实度、时间等因素对填筑体沉降均存在影响。黄土高填方沉降主要发生在施工期，工后沉降所占比例较小。工后沉降随填方高度、时间对数均呈线性增长，工后沉降速率随时间呈指数衰减趋势。与开阔“U”型沟谷相比，狭窄“V”型沟谷地形对填方体有明显变形约束作用，沉降量小，稳定时间短。提高压实度、减小施工速率、控制填方高度均可减小填筑体沉降量，但提高压实度对大厚度填筑体的沉降控制作用更为显著，施工速率改变则对施工期沉降产生更直接的影响，填方高度与长期工后沉降量正相关关系则相对较为稳定。

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	郑建国1
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	曹杰1
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	张继文1
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	刘智1
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	梁小龙1
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	杨超1
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	李波5

关键词 ：土力学, 离心模型试验, 高填方工程, 沉降变形, 影响因素

Abstract：Centrifuge model tests were performed to investigate the settlement of high loess-filled foundations in a valley during construction stage and in post-construction stage，and the influence factors on the settlement were discussed. Results illustrate that the settlement of the high loess-filled foundation is significantly affected by some factors such as the filling rate，filling height，valley shape，degree of compaction and time，and mainly occurs in the construction stage with a small proportion in the post-construction stage. The settlement in the post-construction stage increases linearly with the filling height and logarithmically with the time，while the post-construction settlement rate decreases exponentially with the time. Compared to the filled foundation in a U-shaped valley，the deformation of the loess-filled foundation in a narrow valley is evidently confined and as a result，the settlement is smaller and the time required to reach the stable state is shorter. A high compaction degree，a slow construction rate or a small filling height can reduce the settlement. Furthermore，the improvement of the compaction degree will be more significant for the settlement control of a thick filling body，the change of the construction rate directly affects the settlement of filled foundations in the construction stage，and there is a relatively stable positive correlation between the long-term post-construction settlement and the filling height.

Key words： soil mechanics centrifugal model test high-fill embankment settlement and deformation influencing factors

引用本文:

郑建国1，2，3，曹杰1，2，3，张继文1，2，4，刘智1，2，3，梁小龙1，2，3，杨超1，2，李波5. 基于离心模型试验的黄土高填方沉降影响因素分析[J]. 岩石力学与工程学报, 2019, 38(3): 560-571.
ZHENG Jianguo1，2，3，CAO Jie1，2，3，ZHANG Jiwen1，2，4，LIU Zhi1，2，3，LIANG Xiaolong1，2，3，YANG Chao1，2，LI Bo5. Analysis of influencing factors of high loess-filled foundations based on centrifugal model tests. , 2019, 38(3): 560-571.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2018.0752 或 https://rockmech.whrsm.ac.cn/CN/Y2019/V38/I3/560

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