Investigation of combined step-wised support technology for precise intervention of surrounding rock structure for deep rock roadway
KANG Yongshui1，LIU Quansheng2，LIU Bin1，ZHU Yuanguang1，LI Xiang3，WANG Sheng1
(1. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China；2. School of Civil Engineering and Architecture，Wuhan University，Wuhan，Hubei 430072，China；3. Huainan Mining Industry(Group) Limited Liability Company，Huainan，Anhui 232131，China)
Abstract：To investigate the evolution characteristics of stress and rock structure under high stresses，a testing method for the evolution of the in-situ stress was studied based on the rheological recovery method，which can monitor the disturbed stress in surrounding rock. Based on the weak reflection fiber grating technology and time division multiplexing principle，a large deformation sensor was developed and a real-time monitoring method for rock structure was developed. Further，the distribution of the fractured zone，damage expansion zone and continuous deformation zone under excavation and unloading conditions of deep roadway was studied. The distribution characteristics of stress and the range of damage expansion zone under polar coordinates were derived. The bearing capacity considering the coupling effect of surrounding rock and support was further analyzed，and the proper intervention timing of each support measures was proposed. Subsequently，the intervention timing of support measures such as pre-tensioned bolt，steel support，shotcrete，pre-tensioned cable and deep grouting for different grades of surrounding rock was studied. And the step-wised combined support technology for intervention of rock structure was studied. Support measures should be conducted at a proper timing during the evolution of structure. Pre-tensioned bolt should be applied as early as possible after excavation to restore the normal stress on the roadway surface. Shallow grouting can be carried out when Rr extends to approximately 2Rb/3. Pre-tensioned cable should be installed before the damage expansion area(Rf) exceeds the primary support range of bolts(Rb) and the action range of cables(Rc)，which is favorable for releasing high pressure and hindering rapid expansion of the failure zone. The intervention timing of deep grouting can be implemented when of the fractured zone(Rr) expands to approximately 3Rc/4.
康永水1，刘泉声2，刘 滨1，朱元广1，李 翔3，王 升1. 深部岩巷精准介入围岩结构的分步联合支护技术探索[J]. 岩石力学与工程学报, 2023, 42(11): 2682-2693.
KANG Yongshui1，LIU Quansheng2，LIU Bin1，ZHU Yuanguang1，LI Xiang3，WANG Sheng1. Investigation of combined step-wised support technology for precise intervention of surrounding rock structure for deep rock roadway. , 2023, 42(11): 2682-2693.
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2023, Vol. 42 
