西安科技大学学报2024，Vol.44Issue(5)：857-865,9.DOI:10.13800/j.cnki.xakjdxxb.2024.0506
构造区硬岩可控冲击波预裂参数优化与实践
Optimization of parameters for controllable shock waves pre-splitting in hard rocks in tectonic zones
摘要
Abstract
In order to reduce the impact of hard rock in the structural area of the fully mechanized min-ing face on mining,a controllable shock wave presplitting technique for hard rock was developed through a combination of experiments and numerical simulations.Firstly,a controllable shock wave en-ergy testing platform was built,and the controllable shock wave presplitting tests were conducted using concrete-like materials.Then,by simulating the three-dimensional loading conditions using the continu-um-based discrete element method(CDEM)software,the influence of in-situ stress,shock wave intensi-ty,and elastic modulus on the presplitting range was examined.The results showed that the in-situ stress was inversely proportional to the fracture radius,and the peak stress and the number of shocks were directly proportional to the fracture range.Under the shock energy conditions of a discharge volt-age of 30 kV and a peak pressure of 224 MPa,the presplitting effects of test specimens at different dis-tances from the shock operation point were obtained.Finally,the field application showed that the con-trollable shock wave could significantly affect the development of large whole rock fractures in the hard rock affected area of the mining face.After the shock wave action,the number of rock cracks is more than 3/m2.The rock mass in the presplitting area is loose and angular.The cut rock does not need sec-ondary crushing.The daily advance of the recovery working face is 3～5 m,which is equivalent to the normal mining efficiency.As a new technology for treating the impact zone of hard rock underground actively and proactively in large areas,the controllable shock wave presplitting technology could provide technical support for safe and efficient production in coal mines.关键词
硬岩/可控冲击波/高效预裂/离散元CDEM软件/大面积处理Key words
hard rock/controllable shock wave/efficient presplitting/discrete element CDEM software/large-area processing分类
矿业与冶金引用本文复制引用
陈海俊,陈忠,胡彪,胡强勇,赵有志..构造区硬岩可控冲击波预裂参数优化与实践[J].西安科技大学学报,2024,44(5):857-865,9.基金项目
国家自然科学基金项目(52304255) （52304255）
陕西省教育厅一般专项项目(23JK0546) （23JK0546）
陕西省博士后科研项目(2023BSHYDZZ153) （2023BSHYDZZ153）
