地下综合管廊穿越活动地裂缝变形破坏机制研究

Xi'an is a pilot city for underground integrated pipe gallery in China and is also the city with the most serious ground-fissure-related disasters in China and even in the world. Most of the urban underground integrated pipe gallery planned and constructed in Xi'an are intersected with ground fissures. Therefore, the construction of underground integrated pipe gallery in Xi'an City faces the serious threat of ground fissure disasters.The previous research on ground cracks and their engineering disasters has not been involved in the field of urban underground integrated pipe gallery, which is a new subject.This project takes the ground fissure disaster in Xi'an as the background and chooses the under-constructed underground integrated pipe gallery of the prosperous forest belt as the research project background and support. By means of physical model test, numerical simulation and theoretical analysis, the mechanical model considering the dislocation effect of ground fissures, the structure of pipe gallery, the effect of casing load and the failure of the integrated underground pipe gallery under the multi-factor coupling effect are established.Considering the nonlinear interaction between the pipe gallery structure and the soil mass, the paper explores the disaster mechanism of the damage of the underground pipe gallery under the action of the ground fissure activity and quantifies the reasonable fortification length of the upper and lower plates when the underground integrated pipe gallery crosses the ground fissure.It will provide theoretical and technical guidance for the structural design and the ground fissure disaster prevention of the underground pipe gallery in Xi'an, and enrich the research contents of ground fissure disaster in China.

西安是全国地下综合管廊试点城市，亦是全国甚至全球地裂缝灾害最为严重的城市，西安市最新规划建设的城市地下综合管廊绝大部分与地裂缝相交，因此西安城市地下综合管廊的建设面临严重的地裂缝灾害威胁，以往地裂缝及其工程灾害研究尚未涉及城市地下综合管廊领域，属于全新的课题。本项目以西安地裂缝灾害为背景，选择即将建设的幸福林带地下综合管廊为研究工程背景和依托，采用物理模型试验、数值模拟和理论分析相结合的方法，建立考虑地裂缝位错效应、管廊结构效应、覆土荷载效应及多因素耦合效应下地下综合管廊破坏的力学模型，考虑管廊结构与土体的非线性相互作用，探究地裂缝活动作用下地下综合管廊结构破坏的致灾机理，量化地下综合管廊穿越地裂缝时上、下盘的合理设防长度，为西安市城市地下综合管廊穿越地裂缝带的结构设计以及地裂缝灾害防治提供理论和技术指导，丰富我国地裂缝灾害研究内容。

西安是全国地下综合管廊试点城市，亦是全国甚至全球地裂缝灾害最为严重的城市，根据西安市最新城市地下综合管廊规划，绝大部分城市地下综合管廊均与地裂缝相交，由于城市地下综合管廊的线型特点，埋设时无法彻底避开地裂缝，而在穿越地裂缝时不可避免受地裂缝活动影响，而地裂缝活动对地下综合管廊破坏作用机理方面的研究成果较少。本项目以西安地裂缝灾害为背景，选择幸福林带地下综合管廊为研究工程背景和依托，采用物理模型试验、数值模拟计算和理论分析相结合的方法，建立考虑地裂缝位错效应、管廊结构效应、覆土荷载效应及多因素耦合效应下地下综合管廊破坏的力学模型，考虑管廊结构与土体的非线性相互作用，揭示地裂缝活动作用下地下综合管廊结构破坏的致灾机理，量化地下综合管廊穿越地裂缝时上下盘的合理设防长度，为西安市城市地下综合管廊穿越地裂缝带的结构设计以及地裂缝灾害防治提供理论和技术指导，丰富我国地裂缝灾害研究内容。