Analysis of Rockburst Criteria Based on Measured Data of In-situ Stress During Tunnel Construction
Caoguoshan Tunnel of Manjin Expressway in Yunnan Province is a deep-buried long tunnel. The surrounding rock of the tunnel is hard,complete and brittle. The tunnel construction stage faces the risk of rockburst. For this reason,the stress relief method is used to measure the ground stress along with the construction progress,which provides basic data for the analysis and prediction of rockbursts. In this paper,the measured original rock stress data is used to compare the occurrence level of rockburst through formula operation and fitting analysis,combined with different strength criteria. Finally,the verification and analy-sis are carried out according to the actual occurrence and location of rockburst. The results show that in addi-tion to the stress index,the rockburst prediction standard should also use the multi-factor index for compre-hensive judgment;A certain rockburst prediction method cannot be applied to all underground projects. It is necessary to combine the specific conditions of the project,conduct rockburst risk assessment,and pro-pose rockburst prevention measures for the project. The research results of this paper provide a reference for the analysis,prediction and prevention of rockburst disasters in deeply buried intact hard rocks.
万方数据
维普
