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| 水分及冻融环境下岩石抗拉力学特性 |
| Anti-tensile mechanical characteristics of rock under moisture and freeze-thaw condition |
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| DOI： |
| 中文关键词: 岩石力学 干燥 饱和 冻融循环 抗拉特性 |
| 英文关键词: rock mechanics dry saturation freeze-thaw cycle tensile characteristics |
| 基金项目:国家自然科学基金资助项目(11172232,41272430);陕西省自然科学基金项目(2011JM1003);陕西省教育厅专项基金项目(11JK0525) |
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| 中文摘要: |
| 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. |
| 英文摘要: |
| The drying, saturated and freeze-thaw cycling tests were conducted for the two types of rock which are red sandstone and shale, then Brazilian test and the effectiveness analysis of tensile strength measurement were carried out on various states. The rock damage deterioration and failure process were investigated, the influence of lithology, moisture and freeze-thaw cycle on tensile mechanical characteristics of rock were studied systematically, and the identity and discrepancy of rock tensile and compressive properties were compared. It is shown that, the moisture impacts on the internal microstructure of rock and leads to the decrease of bonding force between rock particles. The frozen-heave force and pore water pressure generate by the freeze-thaw action results in local damage in rock interior. In the role of moisture and freeze-thaw cycles, the tensile strength and elastic modulus decrease significantly, and the reflection of red sandstone is more sensitive. The damage of rock is affected not only by the random distribution of internal defects, but also by the stress state even more important, the rock defects are particularly susceptible to the reduction of intensity under the state of tensile stress. |
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