PBA暗挖车站临时支撑拆除效应研究  

STUDY ON THE IMPACT OF REMOVING THE TEMPORARY SUPPORT IN THE PBA METHOD SUBTERRANEAN STATION

作　　者：梁宪魁 LIANG Xian-kui(China Railway 21st Bureau Group Rail Traffic Engineering Co.,Ltd.,250000,Ji'nan,China)

机构地区：[1]中铁二十一局集团轨道交通工程有限公司,济南250000

出　　处：《建筑技术》2024年第23期2928-2932,共5页Architecture Technology

摘　　要：依托沈阳某地铁暗挖六导洞双跨结构车站,建立三维数值模型,通过修改临时支撑结构的参数来研究沉降和水平位移的影响。在此基础上,当临时支撑强度为C25时,拆撑前地面沉降和水平位移最大值为30.95 mm和7.79 mm,拆撑后沉降和水平位移分别增加了0.53 mm和0.14 mm。设计了5种不同强度,发现临时支撑拆除后地面沉降和水平位移在5种不同强度下变化并不突出,最大差值为1.6 mm和0.21 mm,临时支撑的强度等级对车站安全影响不显著,拆撑后会在拱顶和底板处出现应力集中。Based on a double span structure station with six underground tunnels in a certain subway in Shenyang,a three-dimensional numerical model was established to study the effects of settlement and horizontal displacement by modifying the parameters of the temporary support structure.On this basis,when the temporary support strength is C25,the maximum ground settlement and horizontal displacement before dismantling the support are 30.95 mm and 7.79 mm,respectively.After dismantling the support,the settlement and horizontal displacement increase by 0.53 mm and 0.14 mm,respectively.Five different strengths were designed,and it was found that the ground settlement and horizontal displacement did not change significantly under the five different strengths after the removal of the temporary support,with a maximum difference of 1.6 mm and 0.21 mm.The strength level of the temporary support had no significant impact on the safety of the station,and stress concentration would occur at the arch crown and bottom plate after the removal of the support.

关 键 词：地铁车站 数值模拟 临时支撑 拆撑分析 沉降位移 

分 类 号：U231.3[交通运输工程—道路与铁道工程]