基于波速法的隧道稳定性超前预测

Early prediction of tunnel stability based on wave velocity method

利用地震波纵波速度(V_(p))超前分析隧道围岩的稳定性。首先研究地质强度指标(I)、扰动参数(D)等Hoek-Brown常数与V_(p)之间的关系,然后采用Hoek-Brown准则推导隧道塑性区位移公式,考虑到V_(p)可以从TSP203PLUS中获取围岩的弹性模量、泊松比和V_(p)等一系列参数,最终形成确定隧道塑性区位移的新方法。为证明该方法的有效性,对某隧道进行超前评估,并通过卡斯特纳方程对预测结果进行验证。结果表明,提出的方法计算隧道所得塑性区位移与卡斯特纳方程基本一致,此方法获取的参数更为便捷,具有良好的工程应用前景。

This paper aims to use P-wave velocity(V_(p))to analyze the stability of the surrounding rock in tunnels.Firstly,the relationships between Hoek-Brown constants such as geological intensity index(I),and disturbance parameter(D)and V_(p)were studied.Furthermore,the tunnel displacement was derived by Hoek-Brown criterion.Thirdly,Noticing that a series of parameters such as Young's modulus,Poisson s ratio,and V_(p)of surrounding rock can be read from TSP203 PLUS.A method to determine the displa cement of the plastic zone in tunnels by using the obtaining parameters from TSP203 PLUS was developed.In order to demonstrate the effectiveness of this method,an early evaluation was conducted on a certain tunnel,and the prediction results were validated using the Kastner equation.The results show that the displacement of the plastic zone obtained from the tunnel calculated using the method in this paper is basically consistent with that using the Kastner equation,which is basically consistent with the Kastner equation.The parameters obtained by this method are more convenient,and have good engineering application prospects.