中南大学学报（自然科学版）2025，Vol.56Issue(5)：1957-1968,12.DOI:10.11817/j.issn.1672-7207.2025.05.022
真三轴高压电脉冲岩体致裂试验系统及定向破裂特征
True triaxial high-voltage electric pulse rock fracturing test system and directional fracture characteristics
摘要
Abstract
A directional fracturing test system of high voltage electric pulse rock mass under true triaxial stress was designed and developed.Firstly,the core framework of the test system was constructed by combining the true triaxial test machine with the high-voltage electric pulse system.Secondly,the ultra-dynamic strain gauge was used to monitor the strain changes in the cracking process with high precision.Finally,a series of tests were carried out on red sandstone samples,and the fracture characteristics of high-voltage electrical pulse cracking were systematically studied from three perspectives of discharge energy,load electrode structure and unidirectional confining pressure.The results show that the system consists of three subsystems of high voltage electric pulse system,stress loading control system and data acquisition system.The system can realize accurate control and real-time monitoring of rock mass cracking process under complex stress conditions.The energy conversion efficiency of the loaded electrode is stable at 10%～20%.The discharge energy has the optimal value for the fracturing effect.At low discharge energy,the directional fracturing effect is not obvious.When the energy is too high,the non-energy-gathering direction will produce more cracks,resulting in a decrease in energy utilization.In addition,increasing the width of the discharge hole can significantly improve the propagation efficiency of the shock wave,and the energy release orientation of the 12 mm shaped charge hole is better than that of the 6 mm shaped charge hole.Unidirectional confining pressure inhibits the initiation and propagation of cracks in the direction perpendicular to the confining pressure,while cracks in the direction parallel to the confining pressure are promoted.At the same level of energy,with the increase of unidirectional confining pressure,the average angle between the crack propagation direction and the confining pressure direction decreases,and the crack width and length increase significantly.关键词
液电效应/试验系统/真三轴/定向致裂/峰值应变Key words
electrohydraulic effect/testing system/true triaxial/directional fracture/peak strain分类
矿山工程引用本文复制引用
郭军,张旭,李丽绒,刘全,冯国瑞,白锦文,王志强,文晓泽,米鑫程,冯文明,张洁..真三轴高压电脉冲岩体致裂试验系统及定向破裂特征[J].中南大学学报（自然科学版）,2025,56(5):1957-1968,12.基金项目
国家杰出青年科学基金资助项目(51925402,51904203) （51925402,51904203）
山西省基础研究计划自然科学研究面上项目(202303021211062) （202303021211062）
山西省科技重大专项项目(20201102004) （20201102004）
国家自然科学基金资助项目(52334005)(Projects(51925402,51904203)supported by the National Science Foundation for Distinguished Young Scholars （52334005）
Project(202303021211062)supported by the Shanxi Province Basic Research Program for Natural Science （202303021211062）
Project(20201102004)supported by Shanxi Province Science and Technology Major Special Project （20201102004）
Project(52334005)supported by the National Natural Science Foundation of China) （52334005）
