摘要
针对重庆地区的微风化砂岩,完成了1、3、6、10、15次的干湿循环,对循环后的试件(饱水状态)进行了单轴抗压和劈裂试验。试验结果表明,干湿循环对砂岩造成了不可逆的渐进性损伤,在15次循环后,单轴抗压强度损失达20.73%,抗拉强度达51.96%,弹性模量达33.79%,三者与循环次数之间有良好的对数关系。在干湿循环过程中,砂岩的强度损伤会出现拐点,这取决于水对砂岩的侵蚀程度。
Slightly weathered sandstone in Chongqing area was studied to investigate and quantify the effects of cyclic wetting and drying to the rock strength. The UCS, tensile strength and Young's modulus were measured after subjecting the sandstones to 1, 3, 6, 10, 15 cycles of wetting and drying. The results indicated that the damage of sandstone caused by cycles of wetting and drying is irreversible. UCS, tensile strength and Young' s modulus decrease by 20.73%, 51.96% and 33.79%, respectively, after 15 cycles. There was a marked logarithmic relationship between UCS and cycles, so was tensile strength and Young' s modulus. The erosion of sandstone by water caused an inflexion on damage when sandstone was full saturated.
出处
《水文地质工程地质》
CAS
CSCD
北大核心
2009年第6期54-58,共5页
Hydrogeology & Engineering Geology
基金
国家留学回国人员科研启动基金重点项目(教外司留[2002]247号)
教育部"新世纪优秀人才支持计划"(NCET-05-0763)
国家自然科学基金创新群体基金项目(50621403)