深部爆破引起的裂隙扩展范围的研究

Fracture extension range caused by deep blasting

通过研究地应力卸荷和爆破荷载的耦合机制及其对深部岩体裂隙区拓展的影响方式,建立了初始地应力条件下岩体裂隙区范围的计算模型,并对不同初始地应力下的岩体爆破进行数值模拟,结果表明计算模型与数值模型结果有较好的一致性,证明计算模型有较高的可靠性。同时研究结果表明,在爆炸近区爆炸荷载对围岩裂隙的发展起主要作用,在爆炸远区地应力对爆破荷载的干涉作用较大,地应力对裂隙区范围的拓展也起一定的抑制作用。

Based on the study of the coupling mechanism of geostress unloading and blasting load and their influence on the expansion of deep rock mass fissure zone,the calculation model of the rockfill fissure zone under initial geostress condition is established,and the numerical simulation of rock blasting under different initial geostress is carried out.The results show that the calculated model has a good consistency with the numerical model,which proves that the calculation model has high reliability.At the same time,the results show that the explosion load in the near area plays a major role in the development of the fissures of the surrounding rock,therefore in the far area,the effect of geostress on the blasting load is large,and the geostress also inhibits the expansion of the fissure zone.