Study On The Effect Of Fractures On Surrounding Rock Stability In Zhaozhuang Mine

Rock by rock and structural network of surface and the occurrence of certain geological environment, and therefore will be subject to the mechanical properties of the rock structure which iMPacts their stress environment.â…¢, â…£ grade surface structure structure structure surface is most common, but also is one of the main problems of coal mine safe and efficient mining geological factors, but also the most concerned about the iMPact of coal mine workers. Therefore, this study was level faults, mainly limited scale while its structure is different from other non-structural surface.A large number of engineering practice and research shows that the effect size of the tectonic stress field near the fracture direction will change within the region relative to its far-field stress occurs, which makes the rock mass stress environment becomes complex, the deterioration of the surrounding rock stress state, resulting in the surrounding rock Easy to destruction, mine pressure behavior anomalies supporting large deformation failure, and even induced rock burst power disasters such as mine.In this paper, Zhao Mine engineering background, measured through a large number of field research to understand the situation and faults Zhaozhuang ore mining face pressure behavior 1306(1) Zhaozhuang mine field research observation and rock mechanics tests, the geological structure surrounding rock strength characteristics and development Zhaozhuang mine:the geological structure Zhaozhuang more, a lot of fault development, and the insidious development of small faults In particular, many the majority of the fault to normal faults; 3 coal and roof joint development, high density and extended length; 3 coal seam belongs weak, the overall strength of surrounding rock is not high; Ida to the stress level is moderate stress field;(2) The impact of the numerical simulation study of rock fracture tectonic stress field, come close to the size of the faults and the principal stress will change the direction of the main stress will be deflected; and study the mechanical properties of the fracture surface and surrounding rock influence of faults ends of peak stress;(3) The maximum principal stress caused by local faults occur in the direction of the deflection, the local mine roadway come under pressure to show tectonic influence fracture cause of the exception, and then analyzes the roadway axial direction of the maximum principal stress was a different theory and numerical simulation stress angle in case of distribution and destruction;(4) through on-site observation and theoretical analysis, summed up the three cases occurred Zhaozhuang mine roof leakage risk, the lower-bit free-falling, the top position instability caving, coal wall at landslide falling; and using block theory respectively analysis of Three caving form stability;(5) By the mine working face of 1306 Zhaozhuang faults special area of underground pressure observation, drawn face in the case of parallel faults, tilt direction Face down inclined fault, the advance direction of the mine pressure behavior, as well as direct top ore joint fractured in case pressure behavior.