Experimental research on transient rock breaking characteristics of high-energy gas
CHEN Lijing1，FENG Jimi1，WU Xiaochao2
(1. School of Civil Engineering and Architecture，Xi′an University of Technology，Xi′an，Shaanxi 710048，China；
2. Wuhan Hanyang Municipal Construction Group Corporation，Wuhan，Hubei 430050，China)
Abstract：Using non-explosive high-energy gas to break rock is a technical method often used in engineering practice. In order to study the rock-breaking characteristics of high-energy gas and obtain the key factors that affect the rock-breaking effect，an experimental device is designed to simulate the generation and impact of high-energy gas. By controlling the pressure peak，loading speed and other factors，the simulation of the rock breaking effect of high energy gas with different characteristics is realized. A comparative experimental study of quasi-static and transient loading is used to study the influencing factors that affect the rock breaking effect of high-energy gas. The transient flow theory is used to analyze the motion of high-energy gas in the device，and the pressure characteristics of the effective impact load acting on the bore surface of the specimen are analyzed. Combining the experimental results and theoretical analysis，the influence laws of each factor on the rock breaking effect are explored. The analysis results show that the transient effect of high-energy gas is obvious，and the effect of gas pulse pressure is much larger than that of gas expansion pressure，and the loading speed obviously affects the effect of impact rock breaking. Therefore，in the design of high energy gas rock breaking，when the loading peak is limited，the rock breaking effect can be improved by adjusting the loading speed.
2020, Vol. 39 
