Ultrasonic studies have been used as low-cost, quickly updated, non-destructive techniques in geology and geo-technique. Conventional geophysical operations that allow measurements of wave velocity in rock mass are costly. In this study, we sought a strategy for calculation of wave velocity in rock mass without these field operations. The velocity of a wave in rock mass is a function of two major factors: the intact rock and joint properties. Wave velocity has the highest value in the intact rock, and decreases in the presence of joints, the poorer the conditions of the joints, the greater the decrease. Therefore, wave velocity can be predicted from a measurement of velocity in the intact rock and the properties of the joints. In this research, we first measured P-wave velocity in selected Andesite intact samples from the boreholes, and then measured the rate of effect of joint spacing, opening, orientation, infilling, and roughness on wave velocity by inducing joints in the rock. Afterwards, the orientations of the joints were recorded through surficial joint studies at 29 stations in field. Moreover, the characteristics of the underground joints (6,530 joints) were determined through geotechnical drillings along 9 boreholes (with a total length of 840 m). Finally, the velocity of the P-wave in the rock mass was calculated in field along the assumed profiles. For validation, we compared our velocity estimations with available field data along seven profiles with a total length of 644 m, coinciding with our assumed profiles. The calculated wave velocity and that measured through geophysical operation in field were in close agreement. Thus, wave velocity in rock mass could be computed at an approximation rate of about 10%.

中文翻译：

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无需地球物理地震场测量的岩体中 P 波速度计算 (PVC)

超声波研究已被用作地质和地质技术中的低成本、快速更新、非破坏性技术。允许测量岩体中波速的常规地球物理操作成本高昂。在这项研究中，我们寻求一种无需这些现场操作即可计算岩体中波速的策略。岩体中的波速是两个主要因素的函数：完整的岩石和节理特性。波速在完整岩石中的值最高，有节理时波速下降，节理条件越差，下降幅度越大。因此，可以通过测量完整岩石中的速度和节理的特性来预测波速。在这项研究中，我们首先测量了来自钻孔的选定安山岩完整样品的纵波速度，然后通过在岩石中诱导节理来测量节理间距、开口、方向、填充和粗糙度对波速的影响率。之后，通过野外 29 个站点的表面关节研究记录了关节的方向。此外，地下节理（6,530 个节理）的特征是通过沿 9 个钻孔（总长度为 840 m）的岩土钻探确定的。最后，沿着假定的剖面在现场计算了岩体中 P 波的速度。为了进行验证，我们将我们的速度估计与沿 7 个总长度为 644 m 的剖面的可用现场数据进行了比较，与我们假设的剖面一致。计算的波速与现场地球物理作业测得的波速非常吻合。因此，