近距离平行盾构隧道施工数值模拟及影响因素分析  

Numerical Simulation of Construction Process and Analysis of Influencing Factors in Parallel Shield Tunnelling with Close Distance

作　　者：王博[1] 郑鹏飞[1] 胡江洋[1] 刘军勇[1] 刘硕 WANG Bo;ZHENG Pengfei;HU Jiangyang;LIU Junyong;LIU Shuo(CCCC First Highway Consultants Co.,Ltd.,Xi′an 710075;School of Civil Engineering,Xi′an University of Architecture and Technology,Xi′an 710055)

机构地区：[1]中交第一公路勘察设计研究院有限公司,西安710075 [2]西安建筑科技大学土木工程学院,西安710055

出　　处：《现代隧道技术》2021年第4期117-124,共8页Modern Tunnelling Technology

摘　　要：文章以西安北站至咸阳机场城际轨道项目为例,通过ANSYS有限元软件模拟分析了新建隧道近距离平行施工对已建隧道产生的影响,考虑了“先左孔、后右孔”和“先右孔、后左孔”两种施工工序,重点分析盾构施工中地层损失率、盾构顶推力和注浆情况的影响规律。结果表明,“先左孔、后右孔”对地层位移和已建隧道管片的应力、应变影响较小;地层损失率越小,地表沉降量越小,产生的地表最大沉降量越小,地表沉降坡度越缓;盾构顶推力越大,地表的沉降量越大,随着盾构掘进深度的增大,地表沉降量逐渐减小,直至趋于稳定;注浆材料的弹性模量越大,地表沉降量越小。Taking the intercity rail project from Xi′an North Station to Xianyang Airport as an example,this paper analyzes the impact of the adjacent parallel construction of new tunnels on the existing tunnels through finite ele⁃ment software ANSYS,regarding two construction options of"left bore first before right bore"and"right bore first before left bore".It is mainly focused on the influence patterns of such factors as the ground loss rate,shield thrust and grouting during shield construction.The results show that the option of"left bore first before right bore"has less effect on the ground displacement as well as the stress and strain of the existing tunnel segments;with smaller ground loss rate;the smaller the ground settlement is,the smaller the maximum ground settlement will be,and the flatter the ground settlement slope will be;the greater the shield thrust is,the greater the ground settlement will be,and as the shield excavation distance extends,the ground settlement will gradually decrease until it tends to stabi⁃lize;the higher the elasticity modulus of the grouting materials is,the lower the amount of ground settlement will be.

关 键 词：近距离 盾构隧道 施工工序 数值模拟 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]