Study The Whole Process Of Deformation And Failure Of Surrounding Rock Anchorage Structure In Deep Roadway Based On Multi-source Information

With the increase of coal mining depth,it is very common that high surrounding rock pressure in deep roadway leads to the failure of anchorage support structure.Therefore,this paper aims at the characteristics of deformation and failure of different surrounding rock anchorage structures in deep roadway,and on the basis of summarizing and absorbing previous research results combining with the key project of national natural science foundation of China,“basic theoretical research on deep mining and roadway surrounding rock stability control informatization(51734009)” and the sub-project of national key research and development plan(2017YFC0603001)“surrounding rock deterioration and strength attenuation law of strong mining roadway in a kilometer deep well”,taking Kou Zi dong coal mine of Zhong Mei Xin Ji energy source in Fu Yang,An Hui province as the research object,the first "whole process simulation test system for structural instability of deep underground engineering" in China is adopted,in addition,the whole process of deformation,fracture,evolution and instability of four kinds of anchorage structures was systematically studied by using acoustic emission,geoelectricity,electromagnetic radiation and other multi-source geophysical information monitoring technologies,the whole-process test curves of load-displacement of 4 types of anchorage structures are obtained for the first time,the fracture evolution process and failure characteristics of the anchorage structure were analyzed,the bearing capacity and instability mechanism of the anchorage structure were revealed,the stability control mechanism and technology of surrounding rock in deep roadway were proposed,and the industrial test of roadway was successfully carried out.The main research contents and conclusions are as follows:(1)Independently developed the “whole process simulation test system for structural instability of deep underground engineering” and the anchoring structure mold,model tests of the whole process of deformation,fracture,evolution and instability of four types of anchorage structures in deep roadways were carried out,the load-displacement curves of the whole process of test for 4 kinds of different anchorage structures are obtained for the first time and the evolution characteristics of radial stress and tangential stress in the whole process of anchorage structure instability are analyzed;The variation rules of bearing capacity and displacement field of different anchorage structures are revealed.(2)Physical simulation experiment using AE,geoelectric,electromagnetic radiation and other multi-source information monitoring technology of geophysics,obtain four different anchorage structure under load deformation of roadway surrounding rock failure process ofelectromagnetic radiation,acoustic emission and apparent resistivity response and evolution characteristics,puts forward the supporting of roadway and not different anchorage structure definition method of yield strength,reveals the multi-source information of roadway surrounding rock and the load-displacement coupling law of different anchorage structure.(3)A 3DEC numerical calculation model is established based on the whole process of load displacement test of roadway and anchorage structure,the bearing characteristics of unsupported roadway and different surrounding rock anchorage structures were studied,the main stress in the whole process of deformation and instability of different anchorage structures,the bearing evolution law of supporting structures and the total displacement vector field after failure were systematically analyzed,the rules of bending moment evolution of prefabricated composite anchorage structures are obtained and the mechanism of bearing capacity formation and failure and instability of roadway and anchorage structures is revealed(4)The damage characteristics of unsupported roadway and prefabricated composite anchorage structure supporting roadway surrounding rock are analyzed,and the influence mechanism of supporting strength on surrounding rock stability is revealed;Based on the regression equation of load-displacement curve of anchorage structures with different supporting forms,the load strength calculation model of different anchorage structures is derived and established,and the strength failure criterion of anchorage structures is proposed;The effects of different supporting forms,parameters and lithology on vertical displacement of anchorage structures are obtained.(5)According to the above research conclusions,the surrounding rock stability control technology of "coordinated coupling of anchor cable and U-shaped steel wall thickness filling" overall support is constructed,the key technical system for stability control of surrounding rock reinforcement with high strength and high stiffness in deep roadway is formed,two support schemes of-967 m horizontal west wing rail transport roadway in Kou Zi dong coal mine are optimized and analyzed,the strength and stiffness of the support are improved,which solves the problem of roadway support in Kou Zi dong coal mine and verifies the rationality and practicability of the research conclusion.