| 张慧梅*,杨更社.水分及冻融循环对红砂岩物理力学特性的影响[J].实验力学,2013,28(5):635~641 |
| 水分及冻融循环对红砂岩物理力学特性的影响 |
| On the Influence of Moisture and Freeze-Thaw Cycle on Physical and Mechanical Properties of Red Sandstone |
| 投稿时间：2012-10-09 修订日期：2013-03-25 |
| DOI：10.7520/1001-4888-12-130 |
| 中文关键词: 岩石 水分 冻融循环 损伤劣化 物理力学特性 |
| 英文关键词:rock moisture freeze-thaw cycle damage deterioration physical and mechanical characteristics |
| 基金项目:国家自然科学基金资助项目(11172232, 41272340);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， 11JK0542) |
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| 中文摘要: |
| 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。 |
| 英文摘要: |
| The water-saturated and freeze-thaw cycle experiments in an open system were conducted for dried red sandstone. Then uniaxial compression experiments were carried out for dry, water-saturated samples and samples experienced certain number of freeze-thaw cycles, respectively. Water softening and damage deterioration characteristics due to freeze-thaw of red sandstone were systematically studied, its elastic modulus, strength and stress-strain relation were analyzed. Results show that elastic modulus and strength of red sandstone significantly decreased due to the existence of moisture content, and water influence on strength is more obvious than that on elastic modulus. The presence of moisture and weak structural plane boosts freeze-thaw damage deterioration of rock, and accompanied by the change of rock brittle nature, finally the rock is completely disintegrated due to freeze-thaw cycle. The influence of moisture and temperature on engineering stability must be considered during rock engineering design and construction in cold areas, and comprehensive prevention and control measures to reduce the freeze-thaw disaster, such as enhancing waterproof, drainage and applying heat insulation technology, should be applied. |
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