黄土层下覆强风化岩动弹性模量和阻尼比试验研究

摘要

A series of studies on dynamic elasticity modulus and damping ratio of highly weathered rock which covered by loess are conducted with small strain ed, using triaxial shear equipment and their dynamics properties are analyzed. The results show that the dynamic stress and strain relation of highly weathered rock is nonlinear elastic relations, and fit the model of hyperbolic type with small strain ed. Within the same strain range, the mudstone's damping ratio is greater than the red sandstone's. In the same consolidation condition, the initial elastic modulus of red sandstone is greater than the one of mudstone. The research provides experimental technology and dynamic property parameters to dynamic response analysis and seismic deformation mechanism study for highly weathered rock which covered by thick layer of loess.%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.