【摘要】 通过动三轴试验研究砂土轴向应变的发展过程,从应力状态变化和理论解析两个方面,分析了砂土应力应变滞回曲线及其动力学特性,利用试验测量的滞回曲线来确定土的剪切模量和阻尼比。分析了影响滞回曲线形状的主要因素,解释了砂土在动载荷作用下应力应变滞回曲线出现不规则变化情况的原因。研究结果可为地震或振动等作用下工程建筑的安全性评价提供参考和借鉴。更多还原

【Abstract】 Through the dynamic triaxial test,the on-going process of the sand soil’s axial stress is studied;from the two aspects:the change of the stress state and the analysis from the theory,the stress-strain hysteresis curve of the sand soil and its characteristics of dynamics are analyzed,and using the hysteresis curve from the test and measurement,the shear modulus and damping ration of the sand soil are determined.Besides,the main factors that affect the shapes of the hysteresis curve are analyzed,and the causes of the irregular changes of the stress-strain hysteresis curve under the live load are explained.The results from the study can provide reliable reference and comparison for the safety assessment of a construction in case of any earthquake or vibrations.更多还原