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| Experimental investigation of creep-erosion coupling mechanical properties of water inrush hazards in fault fracture rock masses |
| MA Dan1，2，DUAN Hongyu1，2，3，ZHANG Jixiong1，2，FENG Xiujuan1，2，HUANG Yanli1，2，4 |
(1. School of Mines，China University of Mining and Technology，Xuzhou，Jiangsu 221116，China；
2. State Key Laboratory of Coal Resources and Safe Mining，China University of Mining and Technology，Xuzhou，Jiangsu 221116，China；3. School of Resource and Safety Engineering，Central South University，Changsha，Hunan 410083，China；
4. School of Mining Engineering and Geology，Xinjiang Institute of Engineering，Urumqi，Xinjiang 830023，China) |
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Abstract In order to study the evolution law of water inrush disasters in fault fracture zones，an experimental research on creep-erosion coupling mechanical characteristics of fault fracture rock masses was conducted in this paper. A novel test method，for infecting water around the inner of the seepage cylinder and loading in the axial direction，was invented and innovated，by which the core issue of radial migration of fine rock particles from the surrounding to the center under the action of seepage was broken through. A series of fluid-structure coupling tests of fault fracture rocks under multi-factor conditions were carried out，and the deformation and seepage characteristics of fault fracture rocks during variable-mass water inrush were obtained. The test results show that the variable-mass water inrush process can be divided into three stages，i.e.，the initial stage，the erosion period and the creep period. Among them，the erosion period is the key that determines the germination of variable-mass water inrush disasters，and during the creep period，the large deformation will induce the instability disaster of surrounding rocks. More significant creep effects can be observed in the samples with larger axial stress，larger bore diameter，lower water pressure and lower cementing strength. More obvious erosion effects can be observed in the samples with larger water pressure，larger inner diameter，smaller axial stress and smaller cementing strength. Among influencing factors，the axial stress and the cementing strength are the main controlling factors for the creep behavior of fault rocks，while the axial stress，the water pressure，the cementing strength and the bore diameter all have a great effect on the erosion behavior.
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2021, Vol. 40 
