(1. School of Resource and Environment and Safety Engineering，Hunan University of Science and Technology，Xiangtan，
Hunan 411201，China；2. Hunan Provincial Key Laboratory of Safe Mining Techniques of Coal Mines，Hunan
University of Science and Technology，Xiangtan，Hunan 411201，China；3. School of Mechanics and Civil
Engineering，China University of Mining and Technology(Beijing)，Beijing 100083，China)
Abstract：The stability and control of roadway composite surrounding rock(coal and rock) under inclined thin coal seam mining is a prominent problem in coal resource mining，and hence，it is of great significance to study the failure mechanisms of coal-rock-bolt composite anchor solid formed by coal，rock mass and the support structure. A series of uniaxial compression tests were carried out on horizontal anchored and non-anchored of inclined coal-rock composite specimens(15°，30° and 45°，respectively). The results show that the stress-strain curves of the non-anchored specimens at the post-peak stage stepwise decrease with many small multi-peak fluctuations. When failure of small-angle coal-rock composite specimens occurs，the stress of coal mass acting on the coal-rock structural plane is more uniform，the failure cracks mainly distribute in coal mass and the strength difference of samples is small. When the combination angle increases(＞15°)，the local stress concentration is formed on the coal-rock structural plane，and composite tension and shear failures of coal mass and rock mass occur simultaneously. At this time，the strength of coal and rock mass is determined by coal，rock and bolts together. The cumulative value of the circumferential strain of coal and rock increases with increasing the combined inclination，and the cumulative value of the strain of the anchored specimen is less than that of the non-anchored specimen. Additionally，the cumulative destruction between the coal part and the rock part presents a lag effect，and the coal body fails 50 s ahead of the rock mass. Finally，the mechanical characteristics of the“coal-rock-bolt”inclined composite specimens were discussed，and the influence of the anchorage angle between the bolt and the coal-rock structural plane on the strength of the coal-rock system was analyzed. The experimental results are in good agreement with the theoretical prediction model.
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2020, Vol. 39 
