Damage Model and Numerical Experiment of High-Voltage Electro Pulse Boring in Granite
Damage Model and Numerical Experiment of High-Voltage Electro Pulse Boring in Granite
复制标题
花岗岩高压电脉冲钻孔损伤模型及数值试验
DOI：
10.3390/en12040727
复制
发表时间：
2019-02-02
期刊：
影响因子：
3.2
通讯作者：
Fu, Wenpeng
中科院分区：
文献类型：
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作者：
Li, Changping;Duan, Longchen;Fu, Wenpeng
高压电脉冲钻孔(EPB)具有破岩效率高、壁面质量好等优点，是一种极具潜力的新型破岩方法。EPB过程被定义为随机的，因为它受许多因素的影响。目前，还没有合适的物理和数学模型来描述土压平衡的破岩过程和结果，关于破岩机理的结论也不统一。本文建立了包括冲击波模型和花岗岩高压EPB损伤模型在内的完整的花岗岩高压EPB损伤模型。损伤模型是基于颗粒流程序的二维程序。采用EPB损伤模型，考虑了高压EPB从放电到产生冲击波的全过程，从而可以对电脉冲破岩进行模拟计算。在此基础上，对不同电参数的冲击波时变波形进行了仿真计算。在土压平衡花岗岩损伤几何模型中，表面和内部加载不同形式的冲击波。然后，分析了岩石表面和内部的破坏过程，以及土压平衡的破岩机理。本研究为EPB中岩石破碎度的定量表达和预测提供了科学依据，以提高钻井效率，减少EPB过程中的能量损失。
High-voltage electro pulse boring (EPB) has the advantages of high rock-breaking efficiency and good wall quality, and is a new and efficient potential method of rock breaking. The EPB process is defined as random because it is affected by many factors. At present, there is no suitable physical and mathematical model to describe the process and results of rock breakage in EPB, and the conclusions reached regarding rock-breakage mechanisms are not uniform. In this study, a complete damage model of high voltage EPB in granite is established, which includes a shock wave model and a damage model of high voltage EPB in granite. The damage model is based on the Particle Flow Code two-dimensional program. Use of a damage model of EPB accommodates the complete process of high voltage EPB, from discharge to production of a shock wave, and so rock-breaking via electro pulse can be simulated and calculated. The time-varying waveforms of shock waves with different electrical parameters are simulated and calculated on the basis of the model. Different shock wave forms are loaded into the surface and internal rock in the damage geometric model of EPB granite. Then, the breakage process of the rock surface and internally, and the mechanism of rock breakage using EPB are analyzed. This study provides a scientific basis for the quantitative expression and prediction of rock fragmentation in EPB in order to improve the drilling efficiency and reduction of energy loss in the process of EPB.