论文部分内容阅读
对红砂岩和页岩2种岩石进行干燥、饱水及开放系统下的冻融循环试验,并对各种状态下的岩样进行巴西试验及抗拉强度测试的有效性分析;分析了岩石的损伤劣化及破坏行为,系统研究了岩性、水分及冻融循环作用对岩石抗拉力学特性的影响,并对岩石抗拉压特性的同一性和差异性进行比较.研究表明:水分对岩石内部微观结构产生影响,削弱了岩石颗粒间的连结力;冻融作用产生的冻胀力与孔隙水压力导致岩石内部出现局部损伤;在水分及冻融循环的作用下,岩石抗拉强度及弹性模量显著降低,红砂岩反映更敏感;损伤不仅受岩石内部缺陷随机分布的影响,更重要的是受应力状态的影响,在拉应力作用下岩石缺陷对强度降低特别敏感.
The red sandstone and shale two kinds of rocks were subjected to freeze-thaw cycles under dry, saturated and open systems. The rock samples in various conditions were tested for their effectiveness in Brazil and tensile strength tests. The effects of rock Damage and deterioration of the rock, the effects of lithology, moisture and freeze-thaw cycles on the tensile mechanical properties of the rock were studied systematically, and the differences of the tensile and compressive properties of the rock were compared. The results show that: The microstructure has the effect of weakening the bond force between the rock particles; the frost heaving force and the pore water pressure caused by the freeze-thaw function cause local damage in the rock; under the action of moisture and the freeze-thaw cycle, the tensile strength and elastic modulus The red sandstone reflects more sensitively. The damage is not only affected by the random distribution of internal defects in the rock, but more importantly, it is affected by the stress state. The rock defects are particularly sensitive to the decrease of the strength under tensile stress.