Measuring broken rock zone around unsymmetrical-loading tunnel in geologic and analysis the reason of the liner craks

According to the principle of measuring the broken rock zone(BRZ) with GPR, the method of the measuring of the broken rock zone was proposed. According to the measuring of Gonghe-tunnel, the law of the distribution and vary of broken rock zone of unsymmetrical-tunnel in geologic were obtained. Based on the law of failure of layered rock and the theory of slab-rent structure, the failure model of the rock of unsymmetrical-tunnel in geologic and the reason of the failure of liner were worked out and the treating measurement was proposed.