土钉墙支护基坑对邻近地下管线的影响

发布时间：2018-04-02 22:38

本文选题：土钉墙　切入点：基坑开挖　出处：《水利与建筑工程学报》2015年06期

【摘要】：为了研究基坑开挖支护过程对邻近地下管线的影响,在分析土钉墙、管线与土的相互作用以及基坑开挖的数值模拟方法的基础上,建立了三维非线性有限元模型,比较分析了不同的管线与基坑距离、管线埋深、土钉长度、土钉间距和管线周围土体性质下,地下管线位移的分布与变化规律。结果表明:在基坑拐角以外10 m~20 m范围内会出现远离基坑向水平位移,此处水平向曲率变化最大;粉土下水平位移约为砾质黏土下水平位移的4~5倍;随着管线埋深的增大,竖向位移减小,而水平位移增大,在坑底达到最大值;在坑底位置,粉土水平位移约为砾质黏土的10倍;竖向位移最大时,粉土约为砾质黏土的7倍。
[Abstract]:In order to study the influence of excavation support process on adjacent underground pipelines, a three-dimensional nonlinear finite element model is established based on the analysis of soil nailing wall, the interaction of pipeline and soil, and the numerical simulation method of foundation pit excavation.The distribution and variation of underground pipeline displacement under different distance between pipeline and foundation pit, buried depth of pipeline, length of soil nail, spacing of soil nailing and soil properties around pipeline are compared and analyzed.The results show that there will be horizontal displacement far away from the foundation pit in the range of 10 m ~ 20 m outside the corner of foundation pit, where the horizontal curvature will change the most, and the horizontal displacement under silt is about 4 ~ 5 times as high as that under gravel clay, and with the increase of the buried depth of pipeline, the horizontal displacement under silt is about 5 times of the horizontal displacement under gravel clay.The vertical displacement decreases, but the horizontal displacement increases, reaching the maximum at the bottom; at the bottom position, the silt horizontal displacement is about 10 times of that of the gravel clay; when the vertical displacement is the largest, the silt is about 7 times as much as the gravel clay.
【作者单位】：北京科技大学土木与环境工程学院土木系;中国五洲工程设计集团有限公司;
【基金】：国家自然科学基金资助项目(51078033)
【分类号】：TU753;TU990.3

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