浅埋盾构掘进诱发土体剪胀对地表变形的影响分析  

Effect Analysis of Soil Dilatation Induced by Shallow Buried Shield Excavation on Surface Deformation

作　　者：叶友林 路志旺 孙雅珍[2] 商诗健 钱子杰 YE Youlin;LU Zhiwang;SUN Yazhen;SHANG Shijian;QIAN Zijie(School of Civil Engineering,Shenyang Jianzhu University,Shenyang,China,110168;School of Transportation and Geomatics Engineering,Shenyang Jianzhu University,Shenyang,China,110168)

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳100168 [2]沈阳建筑大学交通与测绘工程学院,辽宁沈阳100168

出　　处：《沈阳建筑大学学报（自然科学版）》2022年第5期871-878,共8页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(52008269);辽宁省教育厅科技计划项目(LJKZ0600)。

摘　　要：目的 研究浅地层盾构掘进过程中隧道周围土体发生剪胀对地表变形的影响。方法 首先通过建立有限差分模型,结合非关联流动准则,得到了隧道周围土体发生剪胀时地表变形的主要区域;进而采用无量纲参数β对传统沉降经验公式进行修正。结果 最大地表沉降随着剪胀系数的增加而减小;采用相关联流动准则和非关联流动准则所得到的最大地表沉降的差值随着支护力的增大而增大;随着隧道埋深比的增加,土体剪胀作用对地表沉降的影响逐渐减小;修正系数β与剪胀系数η二者在预测地表变形规律方面表现出良好的一致性。结论 砂土剪胀对浅埋盾构掘进影响较大,分析地表变形时应合理考虑土体剪胀角。The influence of soil dilatation on surface deformation during shield tunneling in shallow strata is studied.Firstly,the finite difference model is established and the non-correlation flow criterion is used to obtain the main area of surface deformation when the soil around the tunnel is dilated.Then the dimensionless parameter is used to modify the traditional settlement empirical formula.The maximum surface subsidence decreases with the increase of dilatancy coefficient.The difference between the maximum surface settlement obtained by the correlated flow criterion and the non-correlated flow criterion increases with the increase of the support force.With the increase of the buried depth ratio,the influence of soil dilatation on the surface settlement gradually decreases.The correction coefficient and dilatancy coefficient η show good agreement in predicting surface deformation.Sand dilatation has great influence on shallow buried shield tunneling,so the dilatation angle of soil should be considered when analyzing surface deformation.

关 键 词：地铁隧道 剪胀 数值模拟 地表变形 浅埋 

分 类 号：TU47[建筑科学—结构工程] U455.43[建筑科学—土工工程]