Model Test Study on the Transmission Law of Explosion Stress Wave in Rock Mass with Filling Joints

Abstract

In order to study the propagation and attenuation law of explosive stress wave in rock mass with filling joints, and consider the influence of different crustal stress conditions, different strength mortar is used to simulate rock mass and joints, and the multi-functional simulation test device of geotechnical engineering is used to carry out explosive model test research, the influence characteristics of different in-situ stress conditions on the attenuation of explosive stress wave in rock mass with different thickness filling joints are analyzed, and obtain the transmission law of stress wave. The results show that: when the explosion stress wave propagates in the joined rock mass, the thicker the filling joint is, the greater the attenuation range of the stress wave energy and the samller the transmission coefficient; In-situ stress will change the attenuation of explosive stress wave in rock mass. With the increase of in-situ stress, the transmission coefficient of stress wave in intact rock mass and joined rock mass will increase. When the local stress is fixed, the transmission coefficient of stress wave in joined rock mass also increase gradually with the increase of explosion load.