Research And Application Of Support Technology For Deep Soft Rock Roadway In PengZhuang Coal Mine

Buried depth of-700m belt at West Wing of PengZhuang coal mine in JuYe mining area,and mostly passes through the soft and broken mudstone layer,which is a typical deep surrounding rock roadway.In order to better grasp the deformation law and failure mechanism of surrounding rock,on the basis of on-site monitoring,borehole speculum and geological radar detection,around the support problems faced by the rock roadway of PengZhuang coal mine,taking the West wing-700 belt down the mountain as an example,improve the existing support scheme,propose safe and efficient support form,and finally establish and improve the deep surrounding rock support technology system of PengZhuang coal mine.In order to ensure the safe production of the mine.In this paper,the problems in the process of soft rock support in PengZhuang coal mine of JuYe mining area are studied in depth by means of field monitoring,theoretical analysis,numerical simulation and field test.The main achievements are as follows:1.Carry out the field monitoring under the original support conditions,and the deformation and failure law of surrounding rock in soft rock roadway of PengZhuang coal mine is obtained through the statistical regression of the field monitoring data.2.The triaxial compression tests of mechanical properties of deep soft rock under different confining pressures were carried out systematically by using the core samples taken in the field.The variation and mechanical parameters of the surrounding rock under the West wing-700m belt were obtained,and the post peak deformation and failure characteristics of the surrounding rock were analyzed.3.Based on the theory of rock strength failure,a post peak strain softening constitutive model of deep surrounding rock suitable for the West wing-700 belt downhill is proposed.The comparative analysis shows that the constitutive model can better describe the post peak mechanical softening behavior of surrounding rock,and the results of field monitoring and theoretical analysis are highly similar to the results of indoor test,which is the theoretical basis for determining the scheme.4.The mechanism and control effect of the surrounding rock under different bolt(cable)length and matching preload are compared and analyzed.The simulation of the deformation and failure degree of the surrounding rock at the site of the West wing-700 belt downhill is realized,and the deformation and failure mechanism of the surrounding rock at the West wing-700 belt downhill is studied.5.Based on the concept of high-strength prestressed coupling,the paper quantitatively analyzes the effect of surrounding rock control and the time relationship of surrounding rock deformation under different support schemes,and determines the optimal support scheme of the West wing-700 belt downhill site,which effectively controls the deformation and damage of the roadway roof and two sides,the surface deformation of the surrounding rock of the tunnel is reduced,and the normal use of the tunnel is realized.