石灰岩在爆炸载荷作用下的破坏机理试验研究

Experimental Study on Failure Mechanism of Limestone in Explosion Loading

为了探讨岩石在爆炸载荷下的力学特性和破坏机理,采用耦合填塞装药、耦合无填塞装药和不耦合填塞结构模拟了爆炸应力波和爆生气体的不同加载强度,在石灰岩中进行模拟爆破试验,对爆炸应变波及其参数、以及爆破后岩石内部的声波速度进行了测试。基于模拟爆破试验结果,对石灰岩的力学特性和爆破损伤程度进行了分析,得到了岩石在不同爆破条件下的爆破损伤和破坏规律。

In order to probe into the mechanical behaviour and failure mechanism of rock in explosive loading, the different loading strength of the explosive stress wave and the detonation gas were simulated in the conditions of couple charge blasting with stemming and without stemming, and decouple charge with stemming. After the simulating explosion experiments in limestone were performed in the laboratory, the explosion strain waves and their parameters, the results of ultrasonic measure in explosion loaded limestone were investigated. Based on the test results, both the mechanical behaviors and the damage degree of limestone in explosion loading were analyzed, and the damage regu-larities and failure characteristics of rock in the different blasting conditions were obtained.