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高应力硬岩板裂化破坏现象普遍存在于工程地质和采矿工程现场,而以此诱发的板裂屈曲岩爆也给深部资源的安全高效开采带来了严峻挑战。为了分析深部高应力硬岩板裂屈曲岩爆的力学机理与控制对策,对板裂化岩体建立了正交各向异性薄板力学模型,推导出双向受力条件下板裂屈曲岩爆临界荷载值;在解出弯曲形变势能的基础之上,依据能量法求得了薄板压曲状态下的挠度值。提出采用充填法的控制对策以防治板裂屈曲岩爆的发生,并推导出充填体所需的围压值。研究结果表明:(1)针对竖向层状岩体中发生的板裂屈曲岩爆现象,应对板裂化岩体建立正交各向异性薄板力学模型进行相关力学机理的研究;(2)轴向应力的增加不仅促进了板裂化破坏的形成,还加剧了板裂屈曲岩爆发生的可能性;(3)在一定范围内,板裂体在压曲作用下的水平挠度值随板厚的减小而增大,且当长高比为E_2/E_1~(1/4)时,有最大挠度值;(4)在对采空区进行充填时,较小的充填体围压值便可以有效抑制板裂屈曲岩爆的发生。
The cracking of high stress hard rock is widespread in the engineering geology and mining engineering scene, and the rock burst caused by the buckling also brings serious challenges to the safe and efficient mining of deep resources. In order to analyze the mechanics mechanism and control strategy of rock buckling rockburst in high stress hard rock, the mechanical model of orthotropic thin slab is established for rock mass. The critical load of buckling rockburst under two-way stress is deduced On the basis of solving the bending deformation potential energy, the deflection value under the sheet buckling condition was obtained by the energy method. The control strategy of filling method was put forward to prevent the occurrence of buckling rock buckling and deduce the confining pressure value of filling body. The results show that: (1) Aiming at the phenomenon of buckling rock burst occurred in vertical stratified rock mass, mechanical model of orthotropic thin slab should be established for slabbed rock mass; (2) The increase of stress not only promotes the formation of plate cracking, but also exacerbates the possibility of buckling rock burst. (3) Within a certain range, the horizontal deflection value of plate failure body under buckling decreases with the thickness Small and large, and have a maximum deflection value when the aspect ratio is E 2 / E 1 ~ (1/4). (4) The smaller confining pressure value of the filling body can be effective when filling the goaf Inhibit the occurrence of buckling rock burst.