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由于岩石形成过程以及所经历的地质历史作用,岩石内部微观裂纹、裂隙、孔隙等缺陷是客观存在的,而这些缺陷正是导致岩石力学试验结果离散的根本原因。在以往岩石力学试验现象统计分析基础上,详细分析了岩石内部缺陷对应力-应变曲线的影响,提出了显式缺陷和隐式缺陷岩样的概念;结合岩石的地质本质性和室内试验条件,选取岩石的密度和纵波波速作为衡量岩样缺陷程度和强度预测的基本参数,建立了岩石纵波波速、密度和抗压强度预测经验公式;针对显式缺陷和隐式缺陷岩样的试验结果分别提出了抗压强度修正方法,该修正方法的核心就是采用纵波波速和密度作为衡量岩样内部缺陷的定量指标,将岩样的缺陷修正到同一水平,这样将更好地把握岩石力学试验的规律。验证结果表明,所提出的修正方法可以较好地修正由于岩样内部缺陷导致的抗压强度离散值。
Due to the rock formation process and the geological history, the internal defects such as microcracks, fissures and pores in the rock exist objectively, and these defects are the root causes of the discrepancy of the rock mechanics test results. Based on the statistical analysis of previous rock mechanics test phenomena, the influence of internal defects of rock on stress-strain curve is analyzed in detail, and the concepts of explicit defects and implicit fault rock samples are proposed. According to the geological nature of rocks and laboratory test conditions, The density and longitudinal wave velocity of rock are selected as the basic parameters to measure the degree of rock defect and strength prediction. The empirical formula of wave velocity, density and compressive strength of rock is established. The experimental results of explicit and implicit rock samples are respectively The compressive strength correction method, the core of the correction method is to use the longitudinal wave velocity and density as a quantitative index to measure the internal defects of the rock specimen, and correct the defects of the rock specimen to the same level, so that the law of the rock mechanics test will be better grasped. The verification results show that the proposed correction method can well correct the discrete values of compressive strength due to the internal defects of rock samples.