考虑非线性渗流特性的软土隧道开挖变形规律研究  

Study on Deformation Law of Soft Soil Tunnel Excavation Considering Nonlinear Seepage Characteristics

作　　者：陈西林 姜育科 陈伟[3] 沈才华[3] CHEN Xilin;JIANG Yuke;CHEN Wei;SHEN Caihua(Suqian High-speed Railway Construction Development Co., Ltd., Suqian 223800, China;CCCC Nanjing Traffic Engineering Management Co., Ltd., Nanjing 211800, China;Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210024, China)

机构地区：[1]宿迁市高速铁路建设发展有限公司,宿迁223800 [2]中交南京交通工程管理有限公司,南京211800 [3]河海大学岩土力学与堤坝工程教育部重点实验室,南京210024

出　　处：《交通科技》2021年第5期130-135,共6页Transportation Science & Technology

基　　金：国家自然科学基金重点项目(41830110);宿迁市交通运输科技与成果转化项目(sqjt2020-19、20)资助。

摘　　要：为揭示掌子面排水、不同渗流系数对地表沉降、隧道拱顶拱底土层变形的影响规律,文中建立复杂地下水环境下隧道有限元模型,采用Drainage-only flow边界模拟开挖掌子面的出水情况,通过建立流固耦合有限元模型模拟隧道开挖掌子面出水量并计算出排水速率与排水量。结果表明,考虑掌子面排水的条件下,地表纵向沉降总体上大于掌子面不排水的情况,对于不同排水条件,沿水平方向地表沉降曲线均近似为高斯分布,并在隧道开挖面达到峰值;不同渗流系数条件下,地表沉降随着渗流系数的增加而逐渐加大。In order to reveal the influence of drainage and different seepage coefficients on surface settlement and deformation of soil layer at the top and bottom of tunnel arch,a finite element model of tunnel under complex groundwater environment is established,and the Drainage-only flow boundary is used to simulate the water discharge of excavation face.Through the establishment of fluid structure coupling finite element model,the water yield of tunnel excavation face is simulated,and the drainage rate and displacement are calculated.The results show that the longitudinal settlement of the ground surface is larger than that of the undrained tunnel face considering the drainage of tunnel face.For different drainage conditions,the surface settlement curve along the horizontal direction is approximately Gaussian distribution,and reaches the peak value at the tunnel excavation face.Under the condition of different seepage coefficient,the surface settlement increases with the increase of seepage coefficient.

关 键 词：隧道 掌子面 非线性渗流 数值模拟 地表沉降 

分 类 号：U452.14[建筑科学—桥梁与隧道工程]