A Study On Causes And Stability Of Ancient Landslide At Long Xin Fa Coal Mine. LingShi .ShanXi

The Longxinfa coal mine in constructing is to be located at the village of Renyi in Lingshi County, Shanxi, The exploration amount is 30 Million Tons annual. The Longxinfa coal mine to be about mining is under a ancient slope,The area of this ancient slope is 0.21Km~2, classifies to large-scale slope.The stability of this slope Related to the Production safety and Normal operation,.So,It is essential to Evaluate and predict its stability correctly.Combined with the practical problem of evaluation on stability of ancient landslope,Based on the investigation,Data collection,Geological survy and Physical and mechanical experiments,This paper Analysised and Researched its Environmental geology background,Material composition,Structural characteristics and boundary characteristics, And summarized the Development conditions,Mechanism and The law of development of this slope.The main factors effected this ancient slope are underground mining and earthquake. Based on the principle of finite element method, some numerical tests and analyses are used to the displacement and stress condition of the ancient landslide in underground mining and earthquake. some distribution rules of displacement and ground pressure of the ancient landslope in underground mining and earthquake are summarized.At the circumstances of underground mining, In the initial time ,displacement mainly occurred in the the midst of the slope,This slope was in Compression and the sloping strip was in tension, Stress concentration occurred in local.After mining , displacement was increasing and the region of Concentrated area transferred and spreaded,The tension was also increasing, Compressive stress concentration occurred in local,The tensive stress was also increasing at the sloping strip and the phenomenon of Stress concentration was more distinct.To be subjected to the effect of earthquake, This slope was in Tension,and the values of tensile force in every moment are equal.The maximum tensile force mainly occurred at the the Bedrock of the slope; The maximum Shear stress mainly occurred in the the midst and front of the slope, That is the Contact part Between the Bedrock and the lower step of the slope. and the phenomenon of Stress concentration occurred at some specific part of the sloping strip; displacement mainly occurred in the the midst and front of the slope, The Curve of Displacement-Time is Similar to the Curve of earthquake Acceleration.According to Analysis and Research,Some useful Results Are summarized.It can Provides some useful Scientific basis for underground mining and Civil construction latter.