Numerical Analysis Of Large Cross-section Tunnel Construction

Large cross-section tunnel has some obvious advantages, such as accelerating speed, shortening miles, saving fuel and time, etc. However, it also exists many complicated problems which anxiously need to be solved. Due to the large square of excavation, it dramatically increased the possibility that rock masses crossed and therefore formed unstable structure. This is a very bad factor for stability of wall rock, therefore, aspects on designing, construction and its key technology, and wall rock stability, etc. will confront with many tackling leading edge research subjects.On basis of consulting related documents and literature, combining with the actual condition of Shangbian Tunnel, this thesis develops the supervisor measurement and numerical analysis. By demonstrating the NATM, and summarizing and analyzing the construction characteristic of large cross-section tunnel, it takes the principle of Xin'ao into the construction of large cross-section tunnel; with the support of Shangbian tunnel project, draw up specific supervisor measurement plan, management system, and quality guarantee system; combining with the characteristic of Shangbian tunnel project, adopts numerical analysis to make simulation of construction of one-sided and double-sided base tunnel, comparing bout the advantage and disadvantage of the two methods. According to the supporting parameter of Shangbian designing, it gives the construction way and technical method, propose the key point and difficult point of construction, and choose the most suitable method by comparing the methods used for the section of entrance to the cave of Shangbian tunnel.