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基于应变软化的莫尔-库仑模型,模拟比较不同卸荷程度、不同应力荷载比和不同孔隙水压力对围岩分区破裂的影响规律,获得不同条件的破裂条带图像.数值模拟表明,应力荷载比大于1作为不均匀破裂条件是比较合理的,卸荷程度、应力荷载比和孔隙水压力的增大,都导致围岩不均匀破裂程度增大.模拟的围岩不均匀破裂主要是剪切带启动、伸展、缠绕形成的,与环形张拉或劈裂机理不同.模拟结果表明,剪切机制是导致深部围岩非均匀破裂的重要原因.
Based on the Mohr-Coulomb model of strain softening, the effects of different unloading degrees, different stress-loading ratios and different pore-water pressures on the rupture of the surrounding rock are simulated to obtain the images of the rupture bands under different conditions. Numerical simulations show that the stress loading Which is more than 1 as the non-uniform rupture condition, and the unloading degree, the stress load ratio and the increase of pore water pressure all lead to the increase of the uneven rupture of the surrounding rock.The uneven rupture of the surrounding rock is mainly shear Different from the mechanism of toroidal tension or splitting, the results of the simulation show that the shearing mechanism is the important reason that leads to the inhomogeneous rupture of the deep surrounding rock.