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为了快速准确的得到不同应力状态下煤岩的渗透率,提出一种基于格子Boltzmann方法和单轴压缩试验相结合的煤岩渗透率研究方法。首先对煤岩进行压缩破坏试验,获取应力应变曲线,并记录受压破坏过程中不同应力等级的煤岩裂纹图片,编制了孔隙尺度格子Boltzmann模拟程序,利用Grenoble试验对程序进行了验证。然后由程序读取裂纹图片,模拟流体在裂纹中的流动,获取流场压力和流体速度,基于达西方程计算出不同裂纹图片的渗透率数值,得到应力应变与煤岩渗透率的关系曲线,通过数据拟合,给出了应力-渗透率关系。最后与文献中的应力-渗透率关系进行了对比。
In order to obtain the permeability of coal rock under different stress states quickly and accurately, a new method based on the combination of lattice Boltzmann method and uniaxial compression test was proposed. Firstly, compressive failure test of coal and rock was conducted, stress and strain curves were obtained, and pictures of coal and rock cracks with different stress levels during compression failure were recorded. Lattice-scale lattice Boltzmann simulation program was prepared and the program was verified by Grenoble test. Then the crack images are read by the program to simulate the flow of the fluid in the crack to obtain the pressure of the flow field and the fluid velocity. Based on the Darcy equation, the permeability values of different crack images are calculated to obtain the stress- Through data fitting, the stress-permeability relationship is given. Finally, the stress-permeability relationship in the literature is contrasted.