Physico-mechanical rock properties are typically investigated via laboratory tests using core samples. However, sample coring is time consuming and expensive. The longitudinal wave velocity in rock bolts embedded in a rock mass depends on the surrounding rock properties. Hence, the longitudinal wave velocity in rock bolts can be utilized to predict rock properties. This study presents the relationship between granite rock properties and longitudinal wave velocity (v_L) in rock bolts to predict rock properties using the longitudinal wave velocity in a rock bolt. Chemical (saline solution) and mechanical (slake durability test) weathering processes are employed to diversify the properties of the rock specimens. Laboratory tests are conducted on rock specimens to measure the physico-mechanical rock properties, including the velocities (v_p and v_s) associated with constrained and shear moduli, density (ρ), Young's modulus (E), Poisson's ratio (μ), and porosity (η), compressive strength (f_c), and slake durability index (SDI). The measured rock properties are used in the rock mass model, and variations in v_L in the rock bolt with different properties are investigated via numerical simulations. Results show that v_p, v_s, ρ, E, and f_c are correlated significantly with v_L (R² > 0.9), whereas η and SDI are moderately correlated with v_L (R² > 0.7). However, a meaningful correlation between μ and v_L is not obtained. The root mean square and mean absolute percentage errors are estimated to validate the correlation equations, and errors are not considered. Results of the t-test show that the calculated t-value is higher than the critical t-value, and the p-value is smaller than the significance level of 0.05, indicating that the correlation coefficient is significant. This study shows that the velocity of longitudinal waves in a rock bolt can be a useful indicator for predicting in-situ rock properties.

物理力学岩石特性通常通过使用岩心样品的实验室测试来研究。然而，样品取芯既费时又昂贵。嵌入岩体中的锚杆中的纵波速度取决于周围岩石的性质。因此，岩石锚杆中的纵波速度可用于预测岩石特性。本研究提出了花岗岩岩石性质与纵波速度 ( v _L) 在锚杆中使用锚杆中的纵波速度来预测岩石特性。化学（盐溶液）和机械（耐久试验）风化过程用于使岩石标本的性质多样化。对岩石标本进行实验室测试，以测量岩石的物理力学性质，包括_与约束和剪切模量、密度 ( ρ )、杨氏模量 ( E ) 、泊松比( _μ )、和孔隙率 ( η )、抗压强度 ( _fc )和熟化耐久性指数 ( SDI )）。测得的岩石特性用于岩体模型，并通过数值模拟研究不同特性的锚杆中v _{L的变化。}结果表明，v _p、v _s、ρ、E和f _c与v _L ( R ²  > 0.9)显着相关，而η和SDI与v _L ( R ²  > 0.7)呈中度相关。然而，μ和v _{L之间存在有意义的相关性}没有获得。估计均方根和平均绝对百分比误差以验证相关方程，并且不考虑误差。t检验结果表明，计算出的t值高于临界t值，p值小于0.05的显着性水平，说明相关系数显着。这项研究表明，锚杆中的纵波速度可以作为预测原位岩石特性的有用指标。