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水对岩石强度的影响极其复杂,含水的岩石强度指标表征折减,而吸水率是主导岩石强度指标弱化的关键因素。为探讨吸水率对岩石抗剪强度指标的影响规律,以白云岩为研究对象,进行粉晶X—衍射成分分析、浸水试验及直剪试验测试研究分析,结果表明:白云岩自然吸水率偏低,且与时间呈良好的对数关系;岩石强度随浸水时间的增加其抗剪强度指标参数c、φ明显弱化;白云岩吸水率与明显湿度百分比关系密切,以明显湿度百分比量化岩石吸水率,两者呈现良好的二次函数关系。
The influence of water on rock strength is extremely complicated. The water-bearing rock strength index is reduced, while the water absorption rate is the key factor leading the weakening of rock strength index. In order to investigate the influence of water absorption on the shear strength index of rock, dolomite was taken as the research object, and the powder X-ray diffraction analysis, immersion test and direct shear test were carried out. The results show that the natural water absorption of dolomite is low , And had a good logarithmic relationship with time. The shear strength parameters c and φ of rock strength were obviously weakened with the increase of immersion time. The water absorption of dolomite was closely related to the percentage of obvious humidity, The two show a good quadratic function.