基于岩体波速的Hoek-Brown准则预测岩体力学参数方法及工程应用

根据建立的由岩体波速估算地质强度指标GSI和岩体扰动参数D的计算公式，引入Hoek-Brown准则，给出岩体波速预测岩体力学参数方法(简称岩体波速法)。以中缅油气管道(国内段)澜沧江跨域工程边坡岩体力学参数研究为例，并以室内岩石物理力学参数和场区声波测试数据为基础，采用岩体波速法和E. Hoek建议法预测场区的岩体力学参数。结果表明：岩体波速法和E. Hoek建议法所得的结果平均相对误差均较小，两者基本等效，数值模拟结果更进一步验证了工程应用效果的合理性。该方法在试验资料不足的情况下，能为岩体力学参数的快速评价提供一条新途径。

ESTIMATION OF ROCK MASS MECHANICAL PARAMETERS BASED ON ULTRASONIC VELOCITY OF ROCK MASS AND HOEK-BROWN CRITERION AND ITS APPLICATION TO ENGINEERING

According to the established calculation formulae of geological strength index(GSI) and disturbed factor D for rock masses estimated by ultrasonic velocity of rock mass，the rock mass mechanical parameters are predicted by Hoek-Brown criterion based on ultrasonic velocity(the method of rock mass ultrasonic velocity for short). Then，taking Lancang River cross domain engineering slope rock mass of China—Myanmar oil and gas pipelines(domestic section) for example，based on the rock physico-mechanical parameters which were obtained by laboratory test and the wave test data，the rock mass mechanical parameters can be assessed according to the method of rock mass ultrasonic velocity and the Hoek-Brown criterion. It is shown that the calculation results of the method of rock mass ultrasonic velocity accords well with that of the method proposed by E. Hoek. The rationality of the method of rock mass ultrasonic velocity is further explained by numerical results. In addition，the proposed method provides a new approach to determine the mechanical parameters of rock mass，when test data are scant.