相邻深基坑不同开挖方式对所夹地下综合管廊的影响分析  

Analysis of Impact of Different Excavation Methods on Adjacent Deep Foundation Pits on Embedded Underground Comprehensive Utility Tunnel

作　　者：崔天义 张博 赵博生 孙晨光 CUI Tianyi;ZHANG Bo;ZHAO Bosheng;SUN Chenguang(China Railway Construction Engineering Group No.1 Construction Co.,Ltd.,Beijing 100070,China;Department of Civil Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]中铁建工集团第一建设有限公司,北京100070 [2]北京科技大学土木与资源工程学院,北京100083

出　　处：《建筑施工》2023年第8期1686-1690,共5页Building Construction

摘　　要：依托邻近2条地下综合管廊的相邻深基坑工程,建立了基坑开挖支护及地下综合管廊的三维有限元模型,研究了在同步和异步2种开挖方式下,相邻基坑的开挖支护活动对其所夹地下综合管廊受力变形特性的影响。分析结果表明:基坑开挖引起管廊沉降增大,最大值发生在距离基坑侧最近的位置。相邻深基坑同步和异步不同开挖方式对所夹地下综合管廊的最终沉降值影响较小,同步开挖方式下综合管廊沉降均值相对较大。相邻深基坑异步开挖使邻近先挖基坑地下综合管廊的水平位移呈现先增大后减小的变化,这种现象在同步开挖方式下未有体现。不同开挖方式下,综合管廊最终的水平位移变化规律基本类似。综合管廊工程竣工后,管廊顶板的Von-Mises应力和最大剪应力分布较为平均,靠近综合管廊交会处应力发生增大突变。相邻深基坑的不同开挖方式对所夹地下综合管廊的Von-Mises应力和最大剪应力的影响基本类似,基坑的开挖使管廊顶板的Von-Mises应力和最大剪应力都有增大,并导致在距离基坑侧最近位置处出现应力的峰值。相关的研究成果可为类似工程的设计施工提供借鉴经验。Based on the adjacent deep foundation pit engineering of two underground comprehensive utility tunnels,a 3D finite element model of foundation pit excavation support and underground comprehensive utilty tunnel is established.The impact of excavation support activities of adjacent foundation pits on the stress and deformation characteristics of the underground comprehensive utility tunnel under synchronous and asynchronous excavation methods is studied.The analysis results indicate that the excavation of foundation pit causes an increase in the settlement of underground comprehensive utility tunnel,with the maximum value occurring at the closest position to the side of foundation pit.The synchronous and asynchronous excavation methods of adjacent deep foundation pits have a relatively small impact on the final settlement value of embedded underground comprehensive utility tunnel,while the average settlement value of underground comprehensive utility tunnel is relatively large under synchronous excavation methods.The asynchronous excavation of adjacent deep foundation pits results in an increase and then decrease in the horizontal displacement of the underground comprehensive utility tunnel of the adjacent first excavated foundation pit,which is not reflected in the synchronous excavation method.Under different excavation methods,the final horizontal displacement changes of underground comprehensive utility tunnel are basically similar.After the completion of underground comprehensive utility tunnel project,the Von-Mises stress and the maximum shear stress of the roof of underground comprehensive utility tunnel are evenly distributed,and the stress near the intersection of underground comprehensive utility tunnels increases abruptly.The impact of different excavation methods of adjacent deep foundation pits on the Von-Mises stress and maximum shear stress of underground comprehensive utility tunnel is basically similar.The excavation of the foundation pit increases the Von-Mises stress and maximum Shear stress of t

关 键 词：相邻基坑 开挖方式 综合管廊 受力变形 数值模拟 

分 类 号：TU753[建筑科学—建筑技术科学]