Pressure relief technology using dense borehole in soft surrounding rock of deep coalmine roadway and its application
KANG Yongshui1，2，GENG Zhi1，2，LIU Bin1，ZHANG Rui3，LI Xiang3，LI Yinyu1
(1. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China；2. University of Chinese Academy of Sciences，Beijing 100049，China；
3. Huainan Mining Industry(Group) Limited Liability Company，Huainan，Anhui 232131，China)
Abstract：The contradiction between high stress and low strength in deep surrounding rock of coal mines is a key factor leading to large deformation and failure in deep roadways. In order to investigate borehole pressure relief technology in soft rock of deep roadways，the evolution characteristics of the disturbed stress field were analysed. Then，the mechanism of borehole pressure relief in soft rock under high stress is revealed，and the reasonable design method of borehole group is proposed. Three layout modes of pressure relief boreholes were proposed，including parallel layout，fan-layout and pipe-shed layout. The advantages and disadvantages of each layout modes were compared and analysed. Finally，an application experiment is carried out in a deep roadway with soft rock in Guqiao Coal Mine. A total of 96 pressure relief boreholes were drilled using the fan-shaped layout method. Surface displacement monitoring results indicated that，compared with the roadway near similar geological conditions in the non-depressurized area，the deformation of the surrounding rock in the depressurized section can be reduced by about 35.71%，the roof subsidence by approximately 33.43%，and the floor heave by approximately 35.84%. The stress release rate at 12 m depth inner the rock mass is approximately 18.5%. Our research demonstrates that reasonable drilling pressure relief can effectively reduce the concentrated stress，which is conducive to the stability control of roadway and the prevention and control of large deformation disasters. Pressure relief technology using dense borehole can be applied as an auxiliary means for the prevention and controlling large deformation disasters in deep，high-stress，weak surrounding rock.
康永水1，2，耿 志1，2，刘 滨1，张 瑞3，李 翔3，李寅玉1. 煤矿深部巷道软弱围岩密集钻孔卸压技术与应用[J]. 岩石力学与工程学报, 2024, 43(S1): 3187-3194.
KANG Yongshui1，2，GENG Zhi1，2，LIU Bin1，ZHANG Rui3，LI Xiang3，LI Yinyu1. Pressure relief technology using dense borehole in soft surrounding rock of deep coalmine roadway and its application. , 2024, 43(S1): 3187-3194.
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2024, Vol. 43 
