平行叠落地铁区间施工地表沉降特征研究  

Characteristic Study on Surface Settlement of Construction of Parallel Stacking Subway Intervals

作　　者：王祐菁 刘飞 Wang Youjing;Liu Fe(School of Civil and Transportation Engineering,Beijing University of Civil Engineering and Architecture,Beijing 100044,China)

机构地区：[1]北京建筑大学土木与交通工程学院,北京100044

出　　处：《市政技术》2024年第1期147-153,224,共8页Journal of Municipal Technology

摘　　要：北京某在建地铁区间暗挖段工程北侧为单跨双层拱顶直墙断面,采用PBA法施工;南侧为双洞叠落标准断面,上层采用CRD法施工,下层采用台阶法施工。因此,利用有限元软件进行数值模拟分析,研究了“先小后大”+“先下后上”、“先小后大”+“先上后下”、“先大后小”+“先下后上”以及“先大后小”+“先上后下”4种不同施工顺序下,地铁区间施工对纵向地表沉降与横向地表沉降的影响。研究结果表明:在该工程中,采用“先大后小”+“先下后上”的施工顺序引起的地表沉降值最小。该研究成果可为同类型工程地表变形控制提供参考。The north side of a subway interval excavated section project in Beijing is a single-span double-layer vault straight wall section constructed by PBA method;The south side is a double-hole stacked-fall standard section,which the upper layer is constructed by CRD method,and the lower layer is constructed by step method.Therefore,numerical simulation analysis was carried out by finite element software to investigate the effects of subway interval construction on longitudinal and transverse surface settlements under four different construction sequences,namely,"small before large""+"down before up","small before large"+"up before down","large before small"+"down before up",and"large before small"+"up before down".The results show that the surface settlement caused by the construction sequence of"big first,then small"+"first down,then up"is the smallest in this project.This research result can provide reference for the control of surface deformation in similar projects.

关 键 词：地铁区间 平行叠落 工序 数值模拟 地表沉降 多工法 

分 类 号：U455.43[建筑科学—桥梁与隧道工程] P642.26[交通运输工程—道路与铁道工程]