The Study On Rock Mechanics And Prediction Of Rockburst Of Zhazixi Mine

Rock burst is one of the major geological disasters under high stress conditions, which brings casualties of workers and injury and loss of machine. This paper analyzes and predicts rock burst base on background of Zhazixi antimony mine through indoor experiments, statistical analysis, numerical simulation methods, which has important meaning for the safety of mining and theoretical study on rock burst. The main content as follows:(1Researching on mechanical properties of the surrounding rocks (quartz sandstone, tuffaceous sandstones, tuffaceous slate), antimony ore and ore-bearing rocks, such as mineral density, uniaxial tensile strength, compressive strength, poisson’s ratio, elastic modulus and internal friction angle.(2)Analyzing rock burst tendency of the underground rocks by rock mechanics test data using brittleness factor, impact energy indicators, the elastic deformation energy index and the residual energy factor theory,which indicate quartz sandstone, tuffaceous sandstones, tuffaceous slate, antimony ore are rock burst tendency.(3)Analyzing the failure form of various rocks under compression and rock stress values under macroscopic, then getting the stress values when rock microscopic damage through crack initiation stress theory. Proposing rock stress value under macroscopic damage and microscopic damage as underground rock burst prediction criterion ideas.(4)Measuring and analyzing the underground situ stress. Establishing a mining model by rock mechanics test data and situ stress conditions, then analyzing the accuracy of rock burst criterion and fixing a rock burst prediction criterion with FLAC software simulation results and site rock burst situation comparison, which improving the rockburst prediction accuracy.(5)Making the lowest value (quartz sandstone45Mpa) of the rock burst prediction criterion as classification standards of danger zone. According to the mining actual situation, dividing the danger zone to-115m level and-160m level being mined,-205m level and-250m level upcoming mining, and making detailed rock burst forecast through corrected prediction criterion to the danger zone.