Research On Excavation Method And Mechanics Behavior Of Small Spacing Tunnel

This paper analyzes the mechanical behavior of neighborhood tunnel excavation methods research, relying on the project to Li Ping Shallow neighborhood tunnel segments, this paper analyzes includes six main parts:the first major analysis of the domestic small spacing tunnel outside the current research and research content and methods described herein; second, discusses the basic theory and the tunnel wall rock mechanics basic theory, basic theory of finite element; thirdly, describes the design process of Li Ping Neighborhood Tunnel; fourth, relying mainly built for specific projects using five excavation methods model focuses on the basic parameters of the five construction method displacement, stress, strain, etc.; fifth, discusses the neighborhood tunnel monitoring in the new the Austrian law status, and major project monitoring and measurement; sixth, mainly for a comprehensive analysis of the main conclusions drawn in this article and research prospects for Neighborhood Tunnel Conclusive research mainly includes the following three aspects:①Combined with practical engineering design parameters, the use of MIDAS/GTS modeling three-dimensional finite element numerical simulation conducted on the basic mechanical properties of Neighborhood Tunnel:plastic zones, caves weeks displacement, rock stress, as well as ground subsidence;②By Li Ping Shallow neighborhood tunnel section with full-face rock stress under law, step method, CRD method, double side drift method other four construction method, strain, displacement and adding rocks at the comparative analysis of the stress response, and ultimately select the best for a particular rock engineering methods, to ensure that small interval tunnel to reach technically feasible and economically reasonable, to ensure security.③Relying on the project site monitoring information, analysis and monitoring of key parts of the mechanical properties of Neighborhood Tunnel and key parts of the neighborhood tunnel surrounding rock-supporting system stability analysis and judgment.