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针对现有岩爆研究的不足,在物理模拟试验的基础上分析了直墙拱形巷(隧)道岩爆破坏机制及模式,得到了考虑破坏模式的岩爆条件并在此基础上进行了因素敏感性分析。研究表明,根据围岩变形和破坏区被约束程度的不同,岩爆破坏将呈现劈裂破坏、劈裂-剪切破坏和剪切破坏,劈裂-剪切破坏和剪切破坏源于围岩变形的不一致;弯曲应变能是围岩卸荷后由于变形不一致产生的并随着卸荷后载荷的增加而增加,正因为存在变形的不一致才呈现出了不同的破坏形式和爆坑;定义了岩爆危险系数,其值可作为衡量岩爆危险性的度量;高应力区围岩岩爆所需的临界a0(开挖卸荷面爆体中部挠度)是很小的;在a0一定的情况下,劈裂岩爆发生时的破坏区高度范围和深度具有一致的发展趋势;开挖卸荷后的a0值对围岩岩爆的发生与否、强度大小的影响明显。
Aiming at the shortcomings of existing rockburst research, based on the physical simulation test, the rockburst failure mechanism and mode of straight tunnel arched tunnel (tunnel) are analyzed, and the rockburst conditions considering the failure mode are obtained. Based on this, Factor Sensitivity Analysis. The research shows that according to the deformation degree of the surrounding rock and the restricted degree of the damaged area, the rock burst will show the splitting failure, the splitting-shear failure and the shear failure, the splitting-shear failure and the shear failure from the surrounding rock Deformation is not consistent; bending strain energy is generated after the unloading of the rock due to inconsistent deformation and increases with the load after unloading, precisely because of the existence of deformation inconsistencies showed different forms of damage and pits; defined The value of rockburst hazard can be used as a measure of rock burst risk. The critical a0 (middle deflection of excavated surface of excavated rock excavation) in surrounding rocks with high stress is very small. In a certain situation of a0 , The height range and depth of the failure zone in the occurrence of splitting rock burst have a consistent trend of development. The value of a0 after unloading excavation has an obvious effect on the occurrence of rock burst and the intensity of surrounding rock.