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将干燥红砂岩进行饱水及开放系统下的冻融循环实验,并对干燥、饱水及经历一定冻融次数后的试样进行单轴压缩实验,系统地研究了红砂岩的遇水软化性及冻融损伤劣化特性,分析了岩石的弹性模量、强度、应力-应变关系的变化规律。结果表明:在水分的作用下,红砂岩的弹性模量及强度显著降低,且强度受水分影响引起的损伤较弹性模量大;水分及软弱结构面的存在促进了岩石的冻融损伤劣化,并伴随着岩石延脆性性质的改变,最终在冻融循环的作用下完全崩解;在寒区岩体工程设计和施工过程中,必须考虑水分和温度对工程稳定性的影响,采取加强防排水及隔热保温技术等综合防治措施减少冻融灾害。
The dry red sandstone was subjected to freeze-thaw cycles under both saturated and open systems. Uniaxial compression experiments were conducted on dry, saturated and frozen-thawed samples. The water softening properties of red sandstone And the characteristics of freeze-thaw damage, the variation of elastic modulus, strength and stress-strain relationship were analyzed. The results show that under the action of water, the elastic modulus and strength of red sandstone decrease obviously, and the damage caused by the influence of water content is more than the elastic modulus. The existence of water and weak structure surface promotes the freeze-thaw damage of rock, And accompanied by the change of the brittle nature of the rock, and eventually collapse completely under the action of the freeze-thaw cycle. In the rock mass engineering design and construction process, the influence of moisture and temperature on the stability of the project must be considered, And thermal insulation technology and other comprehensive prevention and control measures to reduce freeze-thaw disaster.