基于正态分布的一种岩石(岩块)弹性纵波速度取值方法

Value of elasticcompressive wave velocity of rock(rock block)based on normal distribution

新鲜完整岩石(岩块)波速(Vpr)是计算岩体完整性系数的重要参数,岩石弹性纵波速度取值对岩体完整性评判具有重要作用,但其取值具有较强人为随意性的缺点,对同一类型岩石原位测试进行统计分析,得到了岩石弹性纵波速度分布的概率分布模型。通过不同概率保证率,可以利用概率分布模型得到完整岩体波速的上限值,得到岩石弹性纵波速度参数取值范围。以某抽水蓄能电站中花岗岩试验数据为例,通过实际工程算例表明,所提出的基于正态分布的岩体弹性波参数取值的方法可为实际工程中确定岩体完整性评价提供参考。

The wave velocity(Vpr)of fresh intact rock(rock block)is an important parameter for calculating the integrity coefficient of rock mass.The value of the elastic compressive wave velocity of rock mass plays an important role in the evaluation of the integrity of rock mass,but its value has the disadvantage of strong randomness.The probability distribution model of the elastic longitudinal wave velocity distribution of rock mass is obtained through statistical analysis of the original test of the same type of rock.Through different probability assurance rates,the upper limit value of the wave velocity of the complete rock mass can be obtained by using the probability distribution model,and the value range of the elastic longitudinal wave velocity parameter of the rock can be obtained.Taking the test data of granite in a pumped storage power station as an example,the practical engineering example shows that the proposed method based on the normal distribution of elastic wave parameters of rock mass can provide a reference for determining the integrity evaluation of rock mass in practical engineering.