节理岩体超声测试及单轴压缩试验研究

为了获取节理岩体各向异性力学特性和声波传播规律的相互关系，通过制作圆柱形单一预制贯通节理试件，开展了7种不同倾角节理试件的超声波波速测试和单轴压缩试验。试验结果表明：（1）节理试件波速测试值离散性较大，但总体服从正态分布，波速平均值介于石膏试件和完整试件之间，波速随节理倾角增大呈线性递减；（2）不同倾角的节理面对节理试件力学特性的影响很大，在应力-应变关系、变形特征、强度特征和破坏模式上均表现出显著的各向异性特征；（3）节理试件的力学性质和超声波传播特性变化规律区别很大，采用超声波波速确定节理试件的力学参数会存在很大误差。

Study of ultrasonic test and uniaxial compression test of jointed rock masses

In order to obtain interrelation between anisotropic mechanical characteristics of jointed rock masses and ultrasonic propagation variation, by making the cylinder samples with a precasted joint surface, the ultrasonic test and uniaxial compression test of jointed samples with 7 joint dips are conducted. The results show: (1) The ultrasonic wave velocity test values of jointed samples are discretization and obey the normal distribution. The average of wave velocity is between the intact samples and the gypsum samples, and decreases linearly with increase of joint dip. (2) The joint surface with various joint dips has a great influence on mechanical characteristics of jointed samples, so it has remarkable characteristics of anisotropy in stress-strain curve, deformation, strength and failure modes. (3) There is large difference between the mechanical characteristics of jointed samples and the ultrasonic wave propagation variation, and it will have a great error to determine the mechanical parameters via the ultrasonic wave velocity.