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运用扭剪仪对小应变εd时黄土层下覆强风化岩的动模量和阻尼比进行了系列研究,分析了其动力学特性。结果表明,在小应变情况下风化岩体的动应力与动应变关系为非线性弹性关系,基本符合双曲线型模型;在相同应变范围内,泥岩阻尼比大于红砂岩的阻尼比;在相同固结条件下,红砂岩的初始动弹模大于泥岩初始动弹模。研究为厚覆盖层黄土场地及其下覆强风化岩层、隧道、高边坡动力反应分析和地震后土体变形机理研究提供了必要试验技术和参数。
The dynamic modulus and damping ratio of overburden strong aeolian rocks with small strain εd are studied by using a torsion shear tester. The dynamic characteristics are analyzed. The results show that the relationship between dynamic stress and dynamic strain of weathered rock mass is non-linearly elastic in the condition of small strain, which basically conforms to hyperbolic model. In the same strain range, the damping ratio of mudstone is larger than that of red sandstone. Under the condition of knot, the initial dynamic modulus of red sandstone is larger than the initial dynamic modulus of mudstone. The study provides the necessary experimental techniques and parameters for the analysis of the dynamic response of thick overburden loess and its overlying strong weathered rock strata, tunnels and high slopes, and the deformation mechanism of soils after earthquakes.