Effective approach for surrounding rock control in deep roadway

HOU Chaojiong

Abstract：With the depletion of shallow resources,coal mining gradually turns to deep mining.Considering the complicated mechanical environment,rock mechanical behavior and engineering response,efficient methods of surrounding rock control in deep roadway was put forward.By analyzing factors affecting the surrounding rock stability and their influence rules,it is believed that improving stress state and mechanical property of surrounding rock,choosing reliable support scheme,improving support resistance and optimizing roadway cross-sections are efficient ways to control surrounding rocks in deep roadway.According to field application,basic framework of the control technology in deep roadway was generated.The results show that deep roadway should avoid high stress influence in space and time;surrounding rock deformation can be controlled within 20 mm by stress relief of floor roadway;the stress environment of deep roadway can be improved by upward mining;the advance rate of working face increases from 48 m to 90 m per month;roof and floor convergence decreases by 900 mm through drilling ahead of roadway heading.By using bolts of high-strength,high pre-stressing force and high elongation,together with reliable grouting reinforcement parameters,the mechanical property of surrounding rock can be effectively improved,and the surrounding rock deformation is lowered by more than 40％.Moreover,measures such as arc cross-section and wall back filling should be taken to achieve even support and enhance the support resistance.