岩土力学2017，Vol.38Issue(6)：1600-1608,9.DOI:10.16285/j.rsm.2017.06.008
循环荷载下干燥与饱和砂岩力学特性及能量演化
Mechanical properties and energy evolution of dry and saturated sandstones under cyclic loading
摘要
Abstract
In this study,uniaxial cyclic loading and unloading experiments were conducted on dry and saturated sandstones from Xiaojihan coal mine in Shaanxi province,respectively.The strength and deformation characteristics of rock and its corresponding energy evolution and distribution during the process were analyzed.It is found that the peak strength of dry specimens under cyclic loading and unloading condition was 19.47％ lower than that under uniaxial compression condition.The results demonstrate that the saturation affects both the strength and deformation of sandstone specimens.Compared with dry specimens,the average peak strength of saturated specimens was 39.55％ lower,meanwhile,the saturated specimens present more obvious compaction stage.The loading elastic modulus and unloading elastic modulus tend to increase for dry and saturated sandstones.However,the elastic modulus of saturated specimens was lower than that of dry ones.When the peak strength was normalized,the elastic strain energy Ue and the dissipation energy Ud of dry specimens were larger than those of saturated specimens at different stages of stress loading.During the loading process,the proportion of elastic strain energy Ud of saturated specimens was greater than that of dry one.In addition,the Ud proportion of saturated specimens declined gradually during the loading process.The Ue proportions of dry and saturated specimens achieved an appropriate level prior to failure.关键词
循环加、卸载/饱和试件/弹性模量/能量演化/弹性应变能占比Key words
cyclic loading and unloading/saturated specimen/elastic modulus/energy evolution/proportion of elastic strain energy分类
建筑与水利引用本文复制引用
汪泓,杨天鸿,刘洪磊,赵永川,邓文学,侯宪港..循环荷载下干燥与饱和砂岩力学特性及能量演化[J].岩土力学,2017,38(6):1600-1608,9.基金项目
国家重点基础研究发展计划项目(No.2013CB227902) （No.2013CB227902）
贵州省科技计划项目(黔科合LH字[2016]7465号) （黔科合LH字[2016]7465号）
国家自然科学基金项目(No.51574059).This work was supported by the National Basic Research Program of China (973 Program) (2013CB227902),Guizhou science and technology plan project (LH[2016]7465) and the National Natural Science Foundation of China (51574059). （No.51574059）
