The Analysis Of Strain Localization In The Mining Failure Process Of Open Pit Mining Slope

Our country is under the influence of mining landslide disaster,mine high slope landslide collapse is currently one of the main cause of accidents in mines in our country.Mine landslide accident has the characteristics of sudden,instantaneous and huge destruction,and it is the research object of the scientific research workers at home and abroad.After the reform and opening,China's rapid economic development,the demand for energy is increasing rapidly,and China is rich in mineral resources,so in order to pursue better economic benefits,for mine exploitation is also increasing.With the continuous exploitation of mines,forming a deep concave convex shape,high and steep slope,the slope under blasting vibration,precipitation.The construction of mining disturbance and other uncertain factors,forming a security risk,threatening the safety of construction,but also caused huge economic losses.On the background of Jinchuan open pit quartz mine slope monitoring project,thr ough the analysis of the displacement monitoring to the accumulative value of local fai lure phenomenon based on field slope,analyzes its surrounding 2-C step and section of the landslide is adjacent to the 3-C,4-C,5-C level slope displacement curve.Through the analysis of the monitoring data,the deformation localization site of stress release,tr ansfer and re adjustment,the stress field of re building,part of the stress transfer to the adjacent area of rock,rock damage area distance closer to the regional stress transfer m ore displacement caused by the change of the extent of damage is more obvious,the sl ope is greater.According to the analysis results,the stress mainly to the upper level of t he upper rock mass of slope rock mass transfer,great influence At the same time found in the 3-C monitoring point displacement of potential sliding surface,because the cou pling effect of excavation disturbance and natural factors,the cumulative value appeare d different degree of fluctuation of horizontal displacement 4-C,5-C monitoring 7.2m depth inclinometer,after monitoring key.In the future,we should focus on the blasting effect,and provide the guarantee for the monitoring and early warning.Strength reduction method based on RFPA,established numerical model and field combination,accurately recreate the multilevel local rock and soil profile of 1768 typi cal platform in the construction process of the progressive failure process,analyzed thefailure strain localization phenomenon in slope.Near the free face rock mass in the pr ocess of tension shear failure in the upper part and gradually to the free face away from the rock expansion Near the free face rock mass in the process of tension shear failure in the upper and gradually away from the free face rock expansion When the damage is extended into the upper rock mass damage region and damage area and the lower part of the rock formation damage area greater connectivity,will cause the rock stress furth er bridge more,thereby causing a greater range of rock stress changes.