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中文摘要：
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。
英文摘要：
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.
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