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Cross Fracture Simulation Based on Cohesive Element

机译：基于粘性元件的交叉骨折模拟

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Based on the theory of rock mechanics and fracture mechanics, the hydraulic crack and natural crack are set by Cohesive element, the finite element software ABAQUS is used to set up a two-dimensional model of cross-crack propagation, which is based on fluid-solid coupling. The target mesh is locally encrypted according to the crack fracturing and propagating position, and the near boundary uses a larger mesh density, which can control the calculation accuracy and reduce the calculation time. The model is used to analyze the influence of different stress difference and the angle between natural crack and maximum horizontal stress on the intersection of cracks. The results show that when the ground stress difference is small, the hydraulic crack will crack along the natural crack. When the stress difference is large, the hydraulic crack will extend along the direction of the maximum horizontal principal stress; when the angle between the natural crack and the maximum horizontal ground stress is small, the hydraulic crack extends along the direction of the natural crack. When the angle is large, the hydraulic crack directly penetrates the natural crack and extends along the direction of the maximum horizontal principal stress.
机译：基于岩石力学和断裂力学，液压裂缝和裂纹自然是由衔接元件设置的理论，有限元软件ABAQUS用于设置跨裂纹扩展，这是基于流体的二维模型固耦合。目标网格根据裂纹压裂和传播位置，与近边界使用更大的网格密度，可分别控制的计算精度，并减少计算时间局部地加密。该模型被用于分析不同应力差的影响，裂缝的相交天然裂缝和最大水平应力之间的角度。结果表明，当接地应力差小，液压裂纹将沿自然裂纹开裂。当应力差较大时，液压裂纹将沿最大水平主应力的方向上延伸;当自然裂缝和最大水平应力地面之间的角度是小的，液压裂纹沿着天然裂缝的方向上延伸。当角度大时，液压裂纹直接穿透天然裂缝和沿最大水平主应力的方向上延伸。

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