地铁列车振动荷载作用下土体的动力特性和动强度研究

A STUDY ON DYNAMIC STRENGTH AND DYNAMIC STRESS-STRAIN RELATION OF SILT SOIL UNDER TRAFFIC LOADING

摘要: 通过室内C.K.C循环三轴仪的动三轴试验,研究了在地铁列车循环荷载长期作用下,淤泥质粉质粘土的动强度和动应力-动应变的发展关系。得到了淤泥质粉质粘土的动强度随动荷载连续的循环次数的增加而降低,在设计基础时,所取土的强度指标必须根据一次列车的动荷载大小及其循环次数而定;还得到了淤泥质粉质粘土动应力-动应变关系,并进一步得出了土体的动剪切模量、动抗剪强度等随动应变值的变化而变化的规律。对地铁隧道的设计具有重要价值。

Abstract: Through lab tests by using the typical triaxical test machine-C.K.C, the thesis studies the dynamic strength and stress-strain relation of silt soil under subway traffic loading. And the research shows that the dynamic strength fall as the cycle of the dynamic loading increases, and the stress-strain relation. In addition, the research educes the rules of the dynamic elasticity modulus and dynamic shear strain of the silt soil. The result is beneficial to the design of the subway.