| 刘向峰*,郭子钰,王来贵,高晗,丁盛鹏.冻融循环作用下石窟砂岩物理力学性质损伤规律研究[J].实验力学,2020,35(5):943~954 |
| 冻融循环作用下石窟砂岩物理力学性质损伤规律研究 |
| Experimental study on physical and mechanical property damage of grotto sandstone in freeze-thaw cycle |
| 投稿时间：2019-10-25 修订日期：2020-03-15 |
| DOI：10.7520/1001-4888-19-196 |
| 中文关键词: 冻融循环 石窟砂岩 宏观 细观 层理 |
| 英文关键词:freeze-thaw cycle grotto sandstone macro micro bedding defect |
| 基金项目:国家重点研发计划重点专项项目(2017YFC1503102)资助 |
|
| 摘要点击次数: 376 |
| 全文下载次数: 116 |
| 中文摘要: |
| 为研究不同状态下石窟砂岩冻融循环过程中物理力学性质发展规律，选取完整和缺陷饱和状态、完整和缺陷自然状态、完整和缺陷干燥状态6种不同状态石窟砂岩进行试验研究，通过宏观—细观角度分析砂岩在冻融循环作用下物理力学性质损伤规律。试验结果表明：饱和含层理缺陷岩样受冻融循环质量损失最为显著，对于含层理缺陷或完整无缺陷岩样，含水状态越高，质量损失率越大；在未冻融前各组岩样的纵波波速均随着含水状态的提高而降低，随着冻融周期的增加，所有岩样的波速均有所下降；未冻融条件下完整组岩样抗压强度显著高于含层理缺陷岩样，随着冻融周期的增加，完整岩样抗压强度依然大于含层理缺陷岩样，且含水状态越高,抗压强度越低；在冻融循环作用下，细观观测中含层理组岩样的裂隙条数多于完整组岩样，含层理缺陷组岩样中出现裂隙汇交，而完整组未出现，最后含层理缺陷组岩样裂隙方向大致都平行且沿着层理方向，而完整岩样裂隙无确定方向。在冻融循环作用后，岩样均受到损伤，其中含层理的岩样最为显著。 |
| 英文摘要: |
| In order to study the development law of physical and mechanical properties of grotto sandstone in the process of freeze-thaw cycle, six different states of grotto sandstone, i.e., complete and defective saturated states, complete and defective natural states, complete and defective dry states, are selected for experimental study, respectively. The damage law of physical and mechanical properties of sandstone under the action of freeze-thaw cycle is analyzed from the macro-micro perspective. The test results show that the mass loss of saturated rock samples with bedding defects is the most significant in the freeze-thaw cycle. For rock samples with bedding defects or intact without defects, the higher the water content is, the greater the mass loss rate is; before the freeze-thaw cycle, the longitudinal wave velocity of each group of rock samples decreases with the increase of water content, and with the increase of freeze-thaw cycle, the wave velocity of all rock samples decreases. Without the freeze-thaw cycle, the compressive strength of the lower complete rock sample is significantly higher than that of the rock sample with bedding defects. With the increase of the freeze-thaw cycle, the compressive strength of the complete rock sample is still higher than that of the rock sample with bedding defects, and the higher the water content is, the lower the compressive strength is. Under the freeze-thaw cycle, the number of the fracture of the rock sample with bedding defects is basically greater than that of the complete rock sample, and the fracture convergence occurs in the rock sample with bedding defects. However, the complete formation does not appear. Finally, the fracture directions of the rock samples with bedding defects are generally parallel and along the bedding direction, while the fractures of the complete rock samples have no definite direction. To sum up, the rock samples with bedding defects are significantly affected by freeze-thaw cycles. |
| 查看全文 下载PDF阅读器 |
| 关闭 |
|
|
|
|
|
