Abstract

As the actual jointed rock mass often does not behave elastically, its deformation modulus is typically used in practical engineering. In this study, an analytical equation for characterizing the damage variable of in-situ rock mass was investigated. This equation is primarily based on the P-wave propagation velocity, and its simplified form, which only considers the deterioration of the P-wave propagation velocity compared with intact rocks, is presented. Moreover, a novel approach for estimating the deformation modulus of in-situ rock mass, is proposed, based on the P-wave modulus and simultaneously modified by the damage variable, Poisson's ratio, and an empirical coefficient. A simplified equation comprising only two basic, easily obtainable parameters is also provided, which can approximate the deformation modulus of in-situ rock mass. Literature from in-situ databases was discussed to verify the applicability of the two proposed simplified equations. Back calculation analysis was further conducted to obtain a piecewise function, thereby improving the accuracy of the simplified equation. These validations demonstrate that the proposed estimation method can provide consistent prediction values for the deformation modulus of in-situ rock mass with the same lithology based on its damage variable. Based on observations of the field deformation modulus, the proposed method exhibites a satisfactory degree of accuracy.

摘要

由于实际节理岩体通常不具有弹性，其变形模量通常用于实际工程中。在这项研究中，研究了表征原位岩体损伤变量的解析方程。该方程主要基于纵波传播速度，并给出了仅考虑纵波传播速度相对于完整岩石的劣化的简化形式。此外，提出了一种基于纵波模量并同时通过损伤变量、泊松比和经验系数修正的原位岩体变形模量估计方法。还提供了一个简化的方程，只包含两个基本的、容易获得的参数，可以近似地估计原位岩体的变形模量。讨论了来自原位数据库的文献，以验证所提出的两个简化方程的适用性。进一步进行反算分析，得到分段函数，从而提高了简化方程的精度。这些验证表明，所提出的估计方法可以根据其损伤变量为具有相同岩性的原位岩体的变形模量提供一致的预测值。基于对场变形模量的观察，所提出的方法表现出令人满意的精度。这些验证表明，所提出的估计方法可以根据其损伤变量为具有相同岩性的原位岩体的变形模量提供一致的预测值。基于对场变形模量的观察，所提出的方法表现出令人满意的精度。这些验证表明，所提出的估计方法可以根据其损伤变量为具有相同岩性的原位岩体的变形模量提供一致的预测值。基于对场变形模量的观察，所提出的方法表现出令人满意的精度。