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利用摆锤冲击加载SHPB试验装置,进行砂岩和人造岩心长杆冲击试验和动态巴西盘试验,测试砂岩和人造岩心的黏性系数,分析砂岩和人造岩心强度的加载率效应。利用试验和数值模拟相结合的方法得到绿砂岩、人造岩心A和B的黏性系数分别为100,10和5 k Pa·s。开展不同黏性岩石的动态巴西盘试验,测得砂岩和人造岩心试样的动态抗拉强度随着加载率的增大而增大,表现出一定的加载率相关性;证明了黏性对岩石强度加载率效应的影响,但两者并非正相关;在较小的加载速率下,岩石黏性导致试样中传播的应力波能量衰减,在巴西盘中心点起裂的裂纹沿加载直径方向扩展但是不足以使试样破坏成两半,从而验证了巴西盘裂纹起裂位置。
The SHPB test device was used to test the longwall impact test of sandstone and artificial core and the dynamic Brazilian test. The viscosity coefficient of sandstone and artificial core was tested. The loading effect of sandstone and artificial core strength was analyzed. Green sandstone is obtained by a combination of experimental and numerical simulation. The viscosity coefficients of artificial cores A and B are 100, 10 and 5 kPa · s, respectively. The dynamic Brazilian test of different viscous rocks is carried out. The dynamic tensile strength of sandstone and artificial core samples increases with the increase of loading rate, and shows a certain loading rate dependence. It is proved that the viscosity of rock Strength load rate effect, but the two are not positively correlated; at a small loading rate, the rock viscosity causes the energy of the stress wave propagating in the sample to decay, and the crack propagating in the Brazilian plate center extends along the loading diameter But not enough to damage the specimen in half, thus verifying the Brazilian crack initiation position.