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针对传统的岩体强度参数估算方法考虑风化程度的研究成果较少的不足,引入弹性波速比λ,提出了岩体强度参数的估算方法。以贵州省二叠系两种典型岩体(灰岩和泥岩)为例,讨论了参数λ和正应力σn对岩体强度参数的影响。主要研究成果为:基于弹性波速比与Hoek-Brown强度准则,探讨了不同风化程度岩体抗剪强度参数折减系数的确定方法;研究了正应力与弹性波速比对不同风化程度灰岩与泥岩岩体瞬时抗剪强度参数的影响,结果表明,岩体所处的环境与风化程度是影响岩体剪切强度参数的主要因素;通过多项式拟合,建立了灰岩与泥岩扰动与未扰动情况下不同风化程度强度折减系数的计算公式,从理论上探讨了两种主要岩体不同风化程度对强度参数的影响。
Aiming at the traditional research on rock mass strength parameter estimation considering the degree of weathering, there are not enough research results. By introducing the elastic wave velocity ratio λ, a method for estimating rock mass strength parameters is proposed. Taking the Permian two typical rock masses (limestone and mudstone) in Guizhou Province as an example, the influence of the parameter λ and the normal stress σn on the rock mass strength parameters is discussed. The main research results are as follows: Based on the elastic wave velocity ratio and Hoek-Brown strength criterion, the method to determine the reduction coefficient of shear strength parameters of rock mass with different degrees of weathering is discussed. The effect of normal stress and elastic wave velocity ratio on the different degrees of weathering of limestone and mudstone The results show that the environment and weathering degree of the rock mass are the main factors affecting the shear strength parameters of rock mass. By polynomial fitting, the disturbance and undisturbed state of limestone and mudstone are established Under different weathering intensity reduction coefficient of the formula, the two main rock mass weathering degree on the intensity parameters of the impact of different degrees of weathering.