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为了研究含水率对砂岩渐进破裂过程的影响,采用MTS-815岩石力学试验系统,考虑不同围压及含水率条件下砂岩的三轴试验,对其渐进破裂坏过程进行试验研究,分析不同含水率条件下砂岩的渐进破裂指标及其扩容特性的演化规律。研究结果表明,含水率对砂岩的渐进破裂过程存在促进作用;随着含水率的增加,砂岩的闭合应力、起裂强度、损伤强度和峰值强度均逐渐减小;且当砂岩饱水系数在0.7左右时,岩石损伤强度和峰值强度减少量超过20%;砂岩含水率对岩石强度的弱化作用较明显,而砂岩含水率的变化对扩容速率影响不明显,但随着含水率的增大,岩石压缩极限减小,扩容提前发生。
In order to study the influence of water content on the gradual rupture process of sandstone, the MTS-815 rock mechanics test system was used to investigate the progressive failure process of sandstone under different confining pressures and water cut rates. Under the conditions of sandstone progressive rupture index and its expansion characteristics of the evolution law. The results show that the moisture content promotes the progressive rupture of sandstone. With the increase of water content, the closure stress, rupture strength, damage strength and peak strength of sandstone decrease gradually. When the sandstone saturation coefficient is 0.7 , The damage intensity of rock and peak intensity decrease more than 20%. The sandstone moisture content has more obvious weakening effect on rock strength, while the change of sandstone water content has no obvious effect on the expansion rate. However, with the increase of water content, Reduced compression limit, expansion occurred in advance.