降雨-干燥交替作用下泥质岩耐崩解性试验研究
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TU 458

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甘肃省安全生产科研项目(GAJ00011);甘肃省青年科技基金计划(18JR3RM240);甘肃省安全生产科技项目(GAJ00011)


Experimental study on the slake durability of mudstone under the actionof rainfall and drying
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    摘要:

    泥质岩在自然界频繁的降雨-干燥交替作用下发生崩解,从而引发一系列地质灾害。为了进一步研究泥质岩的崩解特性,采用自行设计的试验装置模拟自然界中降雨的实际环境,对江西省赣南地区的泥质岩制成4种不同块度的试样,开展了干湿循环作用下的室内崩解试验研究。结果表明,不同粒径百分含量关系曲线呈现出三种变化趋势。即:随着循环次数的增加,不同粒径百分含量不断减小、先增大后减小以及不断增大。在试样各粒组百分含量关系曲线中,不同循环次数条件下,曲线都存在一个明显的峰值,曲线基本表现出先增加至峰值,而后减小的变化趋势。在峰值前,随着循环次数的增加,曲线的位置逐渐向下移动;而在峰值后,随着循环次数的增加,曲线的位置则逐渐的向上移动。块度较大的泥质岩崩解后各粒组累计百分含量与粒径的关系曲线呈现出“S”型,而块度较小的泥质岩崩解后则为双曲线形。随着干湿循环次数的不断增加,泥质岩崩解物各粒组累计百分含量关系曲线逐渐向着较小粒径的方向整体发生移动;各曲线之间的空隙不断减小,最后基本重合,反应出泥质岩的崩解速率逐渐减小且最后趋于稳定。推导了基于优化级配方程的相对耐崩解性指数,并验证了模型的正确性。随着试样块度的不断增大,其耐崩解性指数与相对耐崩解性指数均不断减小。

    Abstract:

    Disintegrate of mudstone is conducting under the frequent rainfall-drying interactions in nature, which causing a series of geological disasters. In order to further study the disintegration characteristics of mudstone, a self-designed test device was used to simulate the actual environment of rainfall in the natural environment, and four different lumpiness samples were prepared for the mudstone in the Weinan area of Jiangxi Province. Experimental study on indoor disintegration under cyclic action was carried out. The results show that, The relationships between percentage of each group and cycle number of mudstone disintegration show three trends. That is, as the cycle numbers increases, the percentage of different particle groups decreases, increases first and then decreases, and increases. Moreover, In the curve of the percentage of each particle group, there is a significant peak in the curve under different cycles. The curve basically shows increasing to the peak first, then decreasing. Before the peak, as the cycle numbers increases, the position of the curve gradually moves downward; and after the peak, as the cycle numbers increases, the position of the curve gradually moves upward. In addition, the relationship between the cumulative percentage of particle group and particle size after the disintegration of the larger mudstone shows the “S” shape, while the shale with smaller block size is hyperbolic after disintegration. As the dry and wet cycle numbers increase, the relationship curve between cumulative percentage of each group of mudstone disintegration gradually moves toward the smaller particle size; the gap between the curves decreases continuously, and finally attain basic stable. This indicates that the disintegration rate of the mudstone is gradually reduced and finally stabilizes. Besides, based on the optimized gradation equation, the relative slake durability index is derived and the correctness of the model is verified. As the sample lumpiness increases, its slake durability index and relative slake durability index all decrease.

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引用本文

张磊. 降雨-干燥交替作用下泥质岩耐崩解性试验研究[J]. 科学技术与工程, 2020, 20(15): 6221-6227.
Zhang Lei. Experimental study on the slake durability of mudstone under the actionof rainfall and drying[J]. Science Technology and Engineering,2020,20(15):6221-6227.

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  • 收稿日期:2019-09-12
  • 最后修改日期:2020-06-13
  • 录用日期:2019-11-25
  • 在线发布日期: 2020-06-24
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