Study On Ground Stress Testing Based On Ksiser Effect Of Acoustic Emision And 3D Stress Field Distribution Law Including Structure

Ground stress is to optimize mine,and the main geological basis for effective control of roadway surrounding rock.The study of ground stress,regardless of in theory or practice,has very important significance.In the actual engineering practice,the geological conditions are very complex,which usually contain faults,folds,subsided column.Therefore,when it comes to the construction of the mine and the choice of the method of support,it is important to know about the stress distribution law of the mine.In the past,due to the small number of the measuring point and without the consideration of the structure,the measurement results are not very accurate.Therefore,this paper focuses on the study of the three-dimensional distribution of the large-scale stress field with structure.The main research contents are as follows:(1)The study to test the ground stress is based on acoustic emission Kaiser effect in coal mine.The method of acoustic emission Kaiser effect to test the in-situ stress in coal mine is simple,easy,fast,economy,and it has more measuring points and little influence on the working face,which has good development and application prospect.Through the analysis of Kaiser effect of acoustic emission,the in-situ stress value of the sampling point is defined,and the maximum and minimum horizontal principal stress and vertical stress are got.(2)The paper study the effect of different fault throw(3m,5M and 7m,9m)on the distribution law of shear stress,vertical stress and horizontal stress in the single fault;The paper study the effect of five parameters(the fault intersecting angle,fault throw and intensity of key layer,broken belt strength,buried depth)on the horizontal and vertical direction of the stress field distribution of intersection of the orthogonal X type faults.(3)According to the geological structure of mine which has been known,professional numerical simulation software and large-scale parallel computers are used to establish engineering scale 3D numerical model.Apply the method of the inverse analysis to build the whole stress distribution law,and study the ground stress distribution rule in the condition of the fault structure in the mine.This paper study the effect of fault structure to quantization of ground stress clearly in the coal mine.The acoustic emission Kaiser effect is used to measure in-situ stress.The 3D inverse analysis of ground stress is realized.Any horizontal stress distribution law and structure influence on the distribution of in-situ stress can be extracted from the results of study.The paper realize the visualization of multi-level stress distribution,and intuitive and holistic understanding of stress distribution with geologicstructure can be realized.