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施工环境对膨胀土基坑支护变形影响的模拟分析 被引量:13

Simulated Analysis on the Effect of Construction Environment Conditions on the Deformation of the Supporting Structure of Expansive Soil Foundation Pit
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摘要 膨胀土场地基坑工程变形控制是基坑工程设计和施工所关注的主要问题,其中基坑开挖过程中开挖卸荷、膨胀力作用、振动施工作业等环境条件对基坑支护结构变形影响程度尚缺少深入的研究。本文以经现场实测资料验证的模拟模型为基础,通过模拟计算与实测结果对比,分析了施工过程中开挖卸荷、降雨后膨胀力、锚索施工振动和重载车持续作业及其组合作用等工况对基坑支护桩水平位移的影响程度。结果表明,开挖卸荷的影响最小,占比约为15.45%;降雨后膨胀力和重载车辆持续作业的影响较小,占比分别约为23.81%和23.24%;锚索施工振动的影响最大,占比约为37.50%。 Deformation control of foundation pit engineering in expansive soil field is the main concern of foundation pit engineering design and construction. The influence of excavation unloading,expansive force and vibration construction on the deformation of foundation pit support structure is still lack of in-depth study. Based on the simulation model validated by field measurement data,the influence of excavation unloading,expansive force after rainfall,anchor cable construction vibration and continuous operation of heavy-duty vehicles and their combination on the horizontal displacement of foundation pit supporting piles is analyzed by comparing the simulation calculation with the measured results. The results show that the impact of excavation unloading is the smallest,accounting for about 15.45%;the impact of expansion force after rainfall and continuous operation of heavy-duty vehicles is relatively small,accounting for about 23.81% and 23.24%,respectively;the impact of anchor cable construction vibration is the largest,accounting for about 37.50%.
作者 康景文 任新红 刘永红 李可一 王岩 Kang Jingwen;Ren Xinhong;Liu Yonghong;Li Keyi;Wang Yan(China Southwest Geotechnical Investigation and Design Institute Co.,Ltd.,Chengdu 610052,P.R.China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,P.R.China;Sichuan Branch of Jianyan Foundation Co.,Ltd.,Chengdu 610000,P.R.China)
出处 《地下空间与工程学报》 CSCD 北大核心 2020年第4期1238-1247,共10页 Chinese Journal of Underground Space and Engineering
基金 中建股份(CSCEC-2015-Z-22)。
关键词 基坑支护 施工工况 变形监测 模拟分析 foundation pit support construction conditions deformation monitoring simulation analysis
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