| 彭成,谢阳发,李安然,钟启明.干湿循环作用下红砂岩堆石料力学性能研究[J].南华大学学报(自然科学版),2022,(3):54~59, 112.[PENG Cheng,XIE Yangfa,LI Anran,ZHONG Qiming.Study on Mechanical Properties of Red Sandstone Rockfill Under Dry-wet Cycle[J].Journal of University of South China(Science and Technology),2022,(3):54~59, 112.] |
| 干湿循环作用下红砂岩堆石料力学性能研究 |
| Study on Mechanical Properties of Red Sandstone Rockfill Under Dry-wet Cycle |
| 投稿时间：2021-12-22 |
| DOI： |
| 中文关键词: 堆石料 干湿循环 三轴试验 抗剪强度 |
| 英文关键词:rockfill material dry-wet cycle triaxial test shear strength |
| 基金项目:水利部土石坝破坏机理与防控技术重点实验室开放基金项目(YK319008) |
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| 中文摘要: |
| 为研究红砂岩堆石料在干湿循环作用下的力学性能,以干湿循环次数为主要变量,开展常规三轴压缩试验。研究结果表明:不同干湿循环次数下,红砂岩堆石料应力-应变曲线变化规律基本一致,整体呈现出明显的应变软化。应力-应变曲线在初期快速增加,直至出现峰值,而后开始降低,最后趋于稳定;相同干湿循环次数下,试样破坏强度随围压增大而逐渐增长;相同围压,破坏强度随干湿循环次数增加而逐渐降低,破坏强度与干湿循环次数呈现指数关系;当干湿循环次数增加时,试样强度指标黏聚力逐渐减小,从125.9 kPa降低到62.3 kPa,黏聚力降幅约50%,且黏聚力与干湿循环次数之间成负线性关系;与之相似,另一强度指标内摩擦角逐渐减小,但降低幅度较小,减小幅度为15%左右,与干湿循环次数呈现指数关系。 |
| 英文摘要: |
| In order to study the mechanical properties of red sandstone rockfill under dry-wet cycles, conventional triaxial compression tests were carried out with the number of dry-wet cycles as the main variable. The results show that under different dry-wet cycles, the stress-strain curve of red sandstone rockfill is basically the same, showing obvious strain softening as a whole. The stress-strain curve increases rapidly at the initial stage until there is a peak, then decreases and finally tends to be stable; under the same number of dry-wet cycles, the failure strength increases gradually with the increase of confining pressure, and the failure strength decreases gradually with the increase of the number of dry-wet cycles, and there is an exponential relationship between the failure strength and the number of dry-wet cycles. When the number of dry-wet cycles increases, the cohesion of the sample strength index decreases gradually, from 125.9 kPa to 62.3 kPa, the cohesion decreases by about 50%, and there is a negative linear relationship between cohesion and the number of dry-wet cycles; similarly, the internal friction angle of another strength index gradually decreases, but the reduction is not significant, about 15%, showing an exponential relationship with the number of dry-wet cycles. The purpose of this paper is to provide a reference basis for the design, construction and safe application of earth-rockfill dams dominated by red sandstone and red clay. |
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