Effects of cyclic freezing and thawing on the mechanical behavior of dried and saturated sandstone
Effects of cyclic freezing and thawing on the mechanical behavior of dried and saturated sandstone
复制标题
循环冻融对干饱和砂岩力学行为的影响
DOI：
10.1007/s10064-019-01586-z
复制
发表时间：
2020-03-01
影响因子：
4.2
通讯作者：
Wu, Zhijun
中科院分区：
文献类型：
--
作者：
Fan, Lifeng;Xu, Chao;Wu, Zhijun
本文介绍了冻融循环对干燥和饱和砂岩岩心影响的实验研究。通过静态和动态试验，测定了不同冻融循环次数下干燥和饱和砂岩试件的静态应力-应变关系、单轴抗压强度、弹性模量、动态应力-应变关系、动态强度和动态能量吸收能力。讨论了冻融循环对混凝土力学性能的影响，并引入指数方程描述了冻融循环对混凝土静、动态力学性能的影响。结果表明，随着冻融循环次数的增加，干燥和饱和砂岩试样的静态和动态力学性能均下降。干燥砂岩的静态单轴抗压强度和动态强度均大于饱和砂岩，而静态弹性模量和动态吸能能力均小于饱和砂岩。干燥和饱和砂岩岩心的降解主要发生在前20次冻融循环中。冻融作用对土的静力和动力特性的影响可以用同一指数方程来描述，且具有较好的一致性。
This paper presents an experimental investigation of the effects of cyclic freezing and thawing on dried and saturated sandstone cores. Both static and dynamic tests were performed to determine the static stress-strain relationship, uniaxial compressive strength, elastic modulus, dynamic stress-strain relationship, dynamic strength and dynamic energy absorption capacity of dried and saturated sandstone specimens under different numbers of freeze-thaw cycles. The degradation in several mechanical properties were discussed, and exponential equations were introduced to describe the freeze-thaw cycling effects on the static and dynamic mechanical behaviors. The results show that both the static and dynamic mechanical properties of the dried and saturated sandstone samples decrease with an increasing number of freeze-thaw cycles. Both the static uniaxial compressive strength and dynamic strength of dried sandstone are greater than those of saturated sandstone, while both the static elastic modulus and dynamic energy absorption capacity of dried sandstone are less than those of saturated sandstone. The degradation of the dried and saturated sandstone cores mainly occurs during the first 20 freeze-thaw cycles. Moreover, the same exponential equation can be utilized to describe the freeze-thaw effects on the static behavior and dynamic behavior, with good agreement.