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基于Hudson裂隙理论中等效裂隙模型假设,在均匀介质中嵌入定向排列的薄圆片充填物可构成裂隙介质模型.通过改变充填物薄片的厚度,模拟裂隙的张开度,观测其对纵横波传播的影响.在实验室内用环氧树脂作裂隙模型的基质材料,含硅橡胶的混合低速材料做裂隙充填物.当每个模型中裂隙的直径和个数相等时,仅改变裂隙的厚度,形成了一组相同裂隙密度的裂隙模型.采用超声波脉冲透射法获得了平行和垂直裂隙方向纵横波传播的时间和波形记录.实验表明,在相同裂隙密度条件下,裂隙张开度的变化对纵横波的速度和振幅都有影响,其中纵波振幅的变化比速度变化大得多.横波速度的变化主要反映在慢横波上,振幅的变化快横波比慢横波大.这些特征对地震资料的处理和解释有一定的指导意义.
Based on the hypothesis of the equivalent fracture model in Hudson fracture theory, we can construct the fracture medium model by embedding the aligned thin-walled disk packing in the homogeneous medium. By varying the thickness of the filling sheet and simulating the crack opening, we can observe its influence on the propagation of longitudinal and shear waves In the laboratory, epoxy resin was used as the matrix material for the crack model, and the mixed low velocity material containing silicone rubber was used as the crack filling material. When the diameter and the number of cracks in each model were the same, only the crack thickness was changed to form A group of crack models with the same crack density were obtained.The time and waveform records of longitudinal and transverse wave propagating in parallel and vertical crack directions were obtained by using ultrasonic pulse transmission method.The experimental results show that under the same crack density conditions, The amplitude of the longitudinal wave changes much faster than the velocity.The changes of the velocity of the shear wave are mainly reflected in the slow shear wave.The amplitude of the fast shear wave is faster than that of the slow shear wave.These data have a certain value to the seismic data processing and interpretation Guiding significance.