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Analysis of mechanical behaviors of big pipe roof for shallow buried large-span tunnel

Engineering Sciences 2013年第6期11卷 32-37页

作者： Li Jian Tan Zhongsheng Yu Yu Guo Xiaohong Second Highway Consultants Co. Ltd. China Communications Construction Company Ltd. School of Civil Engineering Beijing Jiaotong University The Second Survey and Design Institute of China Railway

A series of researches on mechanical behaviors of big pipe roof for shallow large-span loess tunnel were carried out based on the Wenxiang tunnel in Zhengzhou—Xi'an Special Passenger Railway. The longitudinal deformations of the pipe roofs were monitored and the mechanical behaviors of the pipe roofs were analyzed at the test section. A new double-parameter elastic foundation beam model for pipe roof in shallow tunnels was put forward in Wenxiang tunnel. The measured values and the calculation results agreed well with each other,revealing the force-deformation law of big pipe roof in loess tunnel:At about 15 m in front of the excavating face,the pipe roof starts to bear the load;at about 15 m behind the excavating face,the force of the pipe roof tends to be stabilized;the longitudinal deformation of the whole pipe roofs is groove-shaped distribution,and the largest force of pipe roofs is at the excavating face. Simultaneously,the results also indicate that mechanical behaviors of pipe roof closely relate to the location of the excavation face,the footage of the tunnelling cycle and the mechanics parameters of pipe roof and rock. The conclusions can be reference for the design parameter optimization and the construction scheme selection of pipe roofs,and have been verified by the result of numerical analysis software FLAC3Dand deformation monitoring.

关键词： shallow burying mining underpass construction loess tunnel pipe roof deformation monitoring mechanical behavior

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