圆形地下洞室坚硬脆性围岩岩爆的模拟

为了探讨圆形地下洞室坚硬脆性围岩岩爆破坏机理,建立了长800mm×宽800mm×厚200mm的Ф160mm圆形地下洞室的数值与物理模型,在相同边界条件与同步提高荷载的情况下模拟圆形洞室坚硬脆性围岩岩爆破坏.数值模拟与物理模拟结果表明：同步施加水平边界荷载Ph与垂直边界荷载Pv到700kN过程中,围岩塑性区逐步沟通扩展;当同步施加Ph=Pv=710kN时,围岩塑性区在极短的时间与极窄的加载区间内迅速扩展,塑性变形显著,洞室围岩表现突发性破坏,符合脆性围岩岩爆破坏特征;随后,当施加Ph=Pv=710kN到Ph=Pv=780kN过程中,围岩塑性区增大不明显,围岩破坏相对稳定.数值模拟结果与物理模拟结果基本一致,两者结合,将为探讨岩爆发生机理提供强有力的研究手段.

Simulation of Rockburst in Hard and Brittle Surrounding Rocks of Circular Underground Cavern

In order to discuss mechanism of rockburst failure in hard and brittle surrounding rock of circular underground cavern, a numerical and a physical model, which are 800mm long and 800mm broad and 200mm thick with a 160mm circular cavern, are made to simulate rockburst in hard and brittle surrounding rock under the same boundary and the same increasing load conditions. There are some research results as follows:Plastic zones in surrounding rock begin to communicate and extend step by step when the horizontal boundary load(P_h) and the vertical boundary load(P_v)are loaded to 700kN synchronously. When P_h and P_v being loaded to 710kN at the same time, plastic zones extend rapidly during a transitory time and a limited loading zone so that a paroxysmal failure takes place, according with the failure characteristics of rockburst. Subsequently, being loaded from P_h=P_v=710kN to P_h=P_v=780kN synchronously, plastic zones of surrounding rock increase indistinctively and its failure is relatively steady. Numerical simulation results are consistent with physical simulation results on the whole. Therefore, their combination will be turned into a strong means to research rockburst mechanism.