Study On The Influence Of Support Space Effect On Endwall Stability In Open-pit Coal Mine

Open-pit coal mine side slope influenced by mining row homework,its stability is affected by membrane support 3 d effect is obvious,with current projects in use 2 d plane strain more simplified way carries on the analysis on the stability of side slope,and there is no consider supporting body 3 d effect influence on the stability of open-pit coal mine end help system research.Aiming at this problem,this paper studies the three-dimensional spatial structure characteristics of the end wall of open pit coal mine through theoretical analysis combined with numerical simulation method,elucidates the law that the stability of the end wall changes with the three-dimensional spatial structure,and reveals the reason for the difference between the three-dimensional and two-dimensional stability of the end wall under the three-dimensional effect of the support body.This paper explores a new method to build 3D geological numerical model,and verifies the practicability of this modeling method with an engineering example.Based on this geological modeling method,the process of pressure drainage in an open pit coal mine in Xinjiang was numerically simulated and analyzed.The main achievements are as follows:(1)Based on the three-dimensional spatial structure characteristics of the end wall of open pit coal mine,the factors affecting the stability of the rock mass of the end wall of open pit coal mine are analyzed,the stress differentiation law of the exposed part of the end wall rock mass under the three-dimensional effect of the support body is defined,and the mechanism of the influence of the support body on the three-dimensional stability of the end wall slope is revealed.(2)The influence of the bottom distance and the Angle of the support slope on the three-dimensional stability of the endwall is analyzed by numerical simulation method,and the reason of the displacement constraint caused by the support on the exposed part of the endwall is revealed.End is studied for Angle and width of the bottom side help stability coefficient under the action of evolution,the in the side slope under the influence of the supporting body exposed part of the two dimensional stability coefficient and the three dimensional stability coefficient of comparative analysis,obtained the former by the plane strain simplify the processing error between the 3 d effect with the latter,for open-pit coal mine end for two dimensional stability coefficient in the practical engineering application provides the evaluation reference value.(3)A new method to effectively establish the complex three-dimensional slope geological model of open-pit mine is explored,and the practical verification of the engineering case is obtained.Modeling method based on a row of presser foot processes in the open-pit coal mine in Xinjiang are analyzed in numerical simulation,establishes the rows of presser foot in south help limit equilibrium theory model,and derive the southern tip of the row of presser foot process in help stability coefficient calculation formula,this paper expounds the south help row within the presser foot slope stress during the process of evolution,reveal the south this process to help potential change and improve the stability of the slip plane position.According to the evolution law of the position of the potential sliding surface with the geometric parameters of the inner drainage,the pressure foot of the inner drainage is divided into three stages,and the influence of the three-dimensional effect of the support body on the three stages of the inner drainage is pointed out,which provides an important reference for the aging control of the end slope of the open-pit coal mine under similar working conditions.There are 59 figures,9 tables and 73 references in the papers.