Gob Side Entry Retaining Technology Of Self Locking Concrete Wall In Fully Mechanized Caving Solf Surrouunding Rock

In this paper, according to the actual geological conditions of 30105 working face in Shiquan coal mine, through theoretical analysis,laboratory experiment and numerical simulation, the gob side entry retaining overburden movement and structural evolution, the surrounding rock stress, the structure design of self-locking solid wall and influence of body structure parameters of roadside support on stability of roadway are analysed systematically,the main conclusions are as follows:(1)According to the gob overburden movement and overburden large structure, small structure theory, system analysis of the gob roof stress transfer mechanism, put forward the surrounding rock "controllable critical zone" theory, "controllable critical zone" by the roadside barrier,solid coal, the roof and floor of the roadway through the lane, roadside support composed of retaining roadway stability maintenance system,and through the reasonable control of the controllable critical zone in different parts, can effectively guarantee the stability of gob side entry retaining.(2)The retained roadway surrounding rock support structure mechanical model is established, and the stress analysis is carried out.The paper take roadside wall, roof and floor directly with different stiffness as roadside support system, construct mechanical model of roadway support system, Analysis of the relationship between the total deformation S and stiffness K of roadway support system and each segment stiffness influence on deformation of roadway support system.(3) The stress and deformation law of surrounding rock in fully mechanized gob side entry retaining roadway at different stages were studied by means of similar material simulation experiment, The two mining abutment pressure has a great influence on the deformation of the surrounding rock and the influence of the two mining on the stability of the surrounding rock is more serious, the residual support pressure in the inclined direction of the working face of the retaining wall has a great influence on the stability of the inclined direction of the wall.(4) Design of the precast concrete block locking solid walls based on a detailed analysis of the advantages and disadvantages of the existing driftside system, through three-dimensional simulation software solidworks simulates the wall block structure and block arrangement,analysis of the self-locking solid wall stability through FLAC3D numerical simulation, the self-locking solid wall is more stable than ordinary wall assembly.(5) Using FLAC3D numerical simulation software, simulation analysis of dynamic changes of stability of surrounding rock for the lane with the advance of working face, a comprehensive analysis of the impact strength?width?structure of roadside barrier to keep the stability of surrounding rock roadway. The results show that the larger the roadway support width, the more stable the surrounding rock, but there are shortcomings of high cost, slow progress, from safety and economy comprehensively determine the intensity and width of roadway support;the top pressure materials is to ensure that the overall strength of wall,make the roadside barrier have appropriate deformability at the same time, more conducive to the stability of roadway support wall.