CAJ | 학술논문

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160mm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P_h与垂直边界荷载P_v到700kN过程中,围岩塑性区逐步沟通扩展;当同步施加P_h=P_v=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P_h=P_v=710kN到P_h=P_v=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.
위료탐토원형지하동실견경취성위암암폭파배궤리,건립료장800mm×관800mm×후200mm적160mm원형지하동실적수치여물리모형,재상동변계조건여동보제고하재적정황하모의원형동실견경취성위암암폭파배.수치모의여물리모의결과표명:동보시가수평변계하재P_h여수직변계하재P_v도700kN과정중,위암소성구축보구통확전;당동보시가P_h=P_v=710kN시,위암소성구재겁단적시간여겁착적가재구간내신속확전,소성변형현저,동실위암표현돌발성파배,부합취성위암암폭파배특정;수후,당시가P_h=P_v=710kN도P_h=P_v=780kN과정중,위암소성구증대불명현,위암파배상대은정.수치모의결과여물리모의결과기본일치,량자결합,장위탐토암폭발생궤리제공강유력적연구수단.
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.