The Judgment Of The Unstable Failure Mode And The Stability Analysis Of The Dangerous Rock Mass In Shan Shu Ya Phosphorite Area

Shanshuya phosphorus mine in Western ore block is located in the territory of Zhang village in Yiling District of Yichang city town in Hubei province.It is an important project of China Sea Grand Pacific Petrochemical Co of China National Offshore Oil Corporation.This paper relies on the project "CNOOC Chemical Co Yichang mining shanshuya phosphorus mine ore blocks west 1.5 million tons / year mining projects mine geological environment protection and restoration".Selected the most typical rock body within the mining area, according to the principle of stereographic projection, use Dips to study the collapse instability mode in the area of dangerous rock mass.Calculating the stability of dangerous rock mass under current situation, and using Flac3 D software to simulate and predict the effect of seam excavation on the stability of rock body.Firstly, collect the data of the previous research in the study area, On the basis of this, a detailed field geological survey was carried out in the study area, Comprehensive grasp of engineering geological conditions of the study area,arrangement the physical parameters related to rock body.Then collected surface parameters related to the rock mass fissure structure. By using the software Dips, will filter out the dangerous rock mass surface structure advantage, The procedure to determine the analysis of unstable rock collapse failure mode with slope Chinese Institute of water conservancy and hydropower instability mode. and according to the stability coefficient calculation formula to calculate the stability coefficient of the rock body, judging the dangerous rock mass stability.Finally,according to the ledge excavation and the location of the range and dangerous rock mass, delineation of the scope of influence of excavation of ore bed of the dangerous rock body, the stratum, rock layer and the surface of the 3D geological model was established by using Ansys software and import the Flac3 D software. According to the open mining layer effects on unstable rock, predicting the mine seam excavation, the stability of rock body. Due to the mining area are distributed in a large number of dangerous rock mass, the rock mass stability of mining excavation of the progress of the project and staff security has a significant impact.Therefore, it is very important to judge the stability and failure mode of the dangerous rock mass, and to take effective measures to the mining area. Prevention and treatment of major economic losses and casualties, the risk of phosphate mining to a minimum.