Evolutionary Mechanism of Coal Breaking by High-Pressure Water Jets Based on Numerical Simulation

Abstract

Currently, coal bed methane (CBM) resources are in urgent need of development to alleviate the problem of resource constraints. This paper proposes a new method for detecting CBM gas by using the electroluminescence optical properties of the material to establish an electro-luminescence analysis method and the effect of CBM gas on the electro-luminescence intensity of nanomaterials to explore the electro-luminescence properties of nanomaterials and their influencing factors. In this paper, we investigate the high-pressure water jet drill bit for coal rock crushing by theoretical analysis, numerical simulation and rock breaking and punching tests, from the mechanism of coal rock crushing by jet, drill bit structure design, drill bit internal structure optimization and drilling and punching tests. By introducing acoustic emission technology, online monitoring of the coal seam crushing process was achieved. Physical tests and numerical simulations focusing on high-pressure water jet impact studied the crushing mechanism and damage characteristics of concrete under high-pressure water jet impact, improved the accuracy and safety of high-pressure water jet crushing technology, and investigated the crushing process of concrete and the damage distribution near the erosion hole. The extraction of CBM through very small radius radial drilling technology is one of the main trends in current exploration and development. The core component of radial drilling technology is the water jet bit, which has a decisive influence on the drilling efficiency and extraction results of radial drilling technology. Among many types of jet bits, the high-pressure water jet bit has the advantages of stability and reliability, strong drilling capacity, etc. It is suitable for the technical requirements of radial drilling, but the research on the mechanism of coal rock fragmentation and its flow field characteristics needs further study.