基于SPH算法的CO_(2)相变破岩数值模拟

Numerical simulation of CO_(2) phase change rock breaking based on SPH algorithm

为解决液态CO_(2)相变爆破破岩仿真中面临的网格畸变等问题,基于光滑粒子流体动力学分析方法(SPH)建立了高压射流冲击破岩数值仿真模型。并通过开展不同射流速度下的液态CO_(2)相变爆破破岩数值仿真研究,探讨了高压射流作用下裂纹扩展的规律和机理。得出对于强度为24 MPa的煤岩,单孔冲击峰值压力在67.2~90.1 MPa,射流冲击速度在250~280 m/s时爆破破裂效果最佳。然后对比了煤岩、大理岩等不同岩体性质下的爆破破坏特征,进一步证实该方法在液态CO_(2)相变爆破仿真中的有效性,为液态CO_(2)相变破岩仿真提供了一种新思路。同时仿真结果可以为液态CO_(2)相变致裂技术在实际工程中的参数选择提供参考。

In order to solve the mesh distortion problems in simulation of liquid CO_(2) phase change blasting rock breaking,based on smooth particle fluid dynamics analysis(SPH),a numerical simulation model of high pressure jet impact rock breaking was established.Through the numerical simulation of liquid CO_(2) phase change blasting rock breaking under different jet velocities,the law and mechanism of crack propagation under high pressure jet are discussed.The results show that for the coal rock with strength of 24 MPa,the peak pressure of single hole impact is 67.2~90.1 MPa,and the jet impact velocity is 250~280 m/s.Then,the blasting failure characteristics of different rock masses such as coal rock and marble are compared,the effectiveness of this method in the simulation of liquid CO_(2) phase change blasting is further verified and a new idea is provided for the simulation of liquid CO_(2) phase change rock breaking.The simulation results can provide reference for the parameter selection of liquid CO_(2) phase transition cracking technology in practical engineering.