地裂缝与综合管廊小角度相交受力特性及安全监测研究

Research on Force Characteristics and Safety Monitoring of Ground Fissures and Integrated Pipe Gallery at Small Angle Intersection

为研究地裂缝与综合管廊小角度相交时的结构力学特性,保证地下综合管廊的施工及运维安全,以西安市某地下综合管廊项目为研究载体,采用数值分析软件ABAQUS,建立地裂缝与综合管廊相交16°时的有限元分析模型,对西安f6地裂缝活动下背景工程综合管廊受力特性进行研究。研究结果表明:管廊与地裂缝小角度相交时,土体竖向位移变化与管廊和地裂缝之间的水平距离相关。上盘位置越靠近地裂缝,土体竖向位移变化越大,反之则越小;管廊变形情况较其他角度存在差异,上下盘管廊结构未产生较大错动,但出现了侧向扭转;管廊不同位置的应力分布情况均有不同程度的改变,具体表现为在下盘顶面应力小于上盘底部隔墙位置的最大拉应力。在施工与运营的过程中,应对管廊结构应力、上部地表沉降、管廊结构错动位置进行着重安全监测。

In order to study the structural mechanical characteristics of the small Angle intersection between the ground crack and the comprehensive pipe gallery,and ensure the safety of the construction and operation of the underground comprehensive pipe gallery,the finite element analysis model of the 16°intersection between the ground crack and the comprehensive pipe gallery was established by using the numerical analysis software ABAQUS,taking the underground comprehensive pipe gallery project in Xi'an as the research carrier.In this paper,the stress characteristics of comprehensive pipe gallery under the background engineering of F6 ground fracture activity in Xi'an were studied.The results show that the vertical displacement of soil is related to the horizontal distance between the pipe gallery and the ground crack when the pipe gallery intersects the ground crack at a small Angle.The closer the hanging wall is to the ground crack,the larger the vertical displacement of soil is,and the smaller it is on the contrary.The deformation of pipe gallery is different from that of other angles.The upper and lower coil pipe gallery structure does not have great dislocation,but lateral torsion occurs.The stress distribution in different positions of pipe gallery changes to different degrees,which is manifested as the stress on the top of footwall is less than the maximum tensile stress on the partition at the bottom of footwall.In the process of construction and operation,the stress of pipe gallery structure,the upper surface settlement and the dislocation position of pipe gallery structure should be monitored emphatically.