| 王来贵*,高晗,郭子钰,丁盛鹏.受冻融循环作用的砂岩宏观变形特征研究[J].实验力学,2020,35(6):1113~1120 |
| 受冻融循环作用的砂岩宏观变形特征研究 |
| Study on macroscopic deformation characteristics of sandstone subjected to freeze-thaw cycle |
| 投稿时间：2019-12-16 修订日期：2020-03-02 |
| DOI：10.7520/1001-4888-19-230 |
| 中文关键词: 冻融循环 层理砂岩 裂隙 变形破坏 |
| 英文关键词:freeze-thaw cycle bedding sandstone fracture deformation and failure |
| 基金项目:国家重点研发计划重点专项项目(2017YFC1503102)资助 |
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| 中文摘要: |
| 冻融循环作用是砂岩风化的重要影响因素，研究冻融循环条件下砂岩的变形破坏规律对寒区岩石文物保护具有重要意义。对不同含水状态含层理及完整砂岩展开冻融循环试验，研究冻融循环条件下不同含水状态砂岩冻融变形破坏规律，在冻融循环过程中实时测定6种状态岩样的应变变化过程。结果表明：含水岩样变形主要包括温度效应造成的热胀冷缩变形和水分结冰膨胀造成的冻胀变形，干燥岩样冻融过程中微变形以“冷缩”为主要特征，温度应力是造成破坏的主要原因。热胀冷缩变形受岩样自身颗粒成分和颗粒组成非均匀程度影响，所以含层理岩样比完整岩样热胀冷缩变形大，而含水率越高冻胀变形越大。 |
| 英文摘要: |
| The freeze-thaw cycle is an important influencing factor for sandstone weathering. Studying the deformation and failure rules of sandstone under the freeze-thaw cycle is of great significance to the protection of rock relics in cold regions. The freeze-thaw cycle tests are carried out on the bedding and intact sandstones in different water-containing states and the freeze-thaw deformation and failure laws of sandstones are studied. The strain changes of the rock samples in 6 states are measured in real-time during the freeze-thaw cycles. The results show that the deformation of water-containing rock samples mainly includes the thermal expansion and contraction deformation caused by temperature effects and the frost heave deformation caused by icing and water expansion. The micro-deformation of dry rock samples during freezing and thawing is mainly characterized by “cold shrinkage”. The temperature stress is the main cause of damage. The thermal expansion and contraction deformation is affected by the non-uniformity of the particle composition and particle composition of the rock sample, so the stratified rock sample has greater thermal expansion and contraction deformation than the complete rock sample, and the higher the water content is, the greater the frost heave deformation becomes. |
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