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崩解泥化过程中泥岩强度衰减因素研究

曹雪山, 额力素, 赖喜阳, 周赛, 李国维, 袁俊平, 吴建涛

曹雪山, 额力素, 赖喜阳, 周赛, 李国维, 袁俊平, 吴建涛. 崩解泥化过程中泥岩强度衰减因素研究[J]. 岩土工程学报, 2019, 41(10): 1936-1942. DOI: 10.11779/CJGE201910019
引用本文: 曹雪山, 额力素, 赖喜阳, 周赛, 李国维, 袁俊平, 吴建涛. 崩解泥化过程中泥岩强度衰减因素研究[J]. 岩土工程学报, 2019, 41(10): 1936-1942. DOI: 10.11779/CJGE201910019
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CAO Xue-shan, E Li-su, LAI Xi-yang, ZHOU Sai, LI Guo-wei, YUAN Jun-ping, WU Jian-tao. Factors for strength attenuation of mudstone during slaking and disintegration[J]. Chinese Journal of Geotechnical Engineering, 2019, 41(10): 1936-1942. DOI: 10.11779/CJGE201910019
Citation: CAO Xue-shan, E Li-su, LAI Xi-yang, ZHOU Sai, LI Guo-wei, YUAN Jun-ping, WU Jian-tao. Factors for strength attenuation of mudstone during slaking and disintegration[J]. Chinese Journal of Geotechnical Engineering, 2019, 41(10): 1936-1942. DOI: 10.11779/CJGE201910019
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崩解泥化过程中泥岩强度衰减因素研究  English Version

  • 1. 河海大学道路与铁道研究所,江苏 南京 210024;
    2. 河海大学岩土力学与堤坝工程教育部重点实验室,江苏 南京 210024

基金项目: 国家重点研发计划重点专项项目（2017YFC0404800）; 国家重点研发计划重点专项项目（2017YFC0404801,2017YFC0404804）
详细信息
    作者简介:

    曹雪山(1970—),男,博士,副教授,硕土生导师,从事非饱和土固结、土石坝数值计算、泥质岩崩解特性及地基与基础工程、地基处理等教学与研究。E-mail:x.s.cao@163.com。

Factors for strength attenuation of mudstone during slaking and disintegration

  • 1. College of Civil Engineering and Transporation Engineering, Hohai University, Nanjing 210024, China;
    2. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210024, China

摘要

    摘要
  • 摘要: 崩解是泥岩的基本特性,是土体的主要形成方式。受自然气候的干湿循环作用影响,泥岩崩解、泥化,引发了许多边坡坡面剥蚀及边坡失稳问题。因此研究泥岩在崩解泥化过程中强度衰减的影响因素具有重要的工程意义。以引江济淮试验工程的河道边坡下部低强度、弱膨胀的红层泥岩为研究对象,提出了自然约束的崩解试验研究方法,对干湿循环过程中泥岩试样的裂隙开展,颗粒组分,耐崩解比,剪切强度及强度指标等参数进行了研究。研究表明：干湿循环效应存在临界次数。在7次干湿循环前,泥岩试样的参数变化显著,有裂隙增长、细颗粒含量比例增加,耐崩解比、剪切强度及强度指标的减小。7次干湿循环后,这些参数变化均不明显。崩解物的耐崩解性变化特征与完全崩解颗粒粒径阈值Dcr无关,耐崩解指数IDi及耐崩解率DR减小特征趋势相同。泥岩崩解物的强度指标与耐崩解率DR呈现很高的正相关性。这些说明干湿循环为诱发岩石崩解的因素,对强度衰减起作用的是试样的颗粒组成与状态变化,耐崩解率是颗粒组成与状态的量化指标。
    Abstract: Slaking, a common engineering characteristic, is the main weathering mode from clay-bearing rocks to soils. Due to the influences of wetting-drying cycles of natural climate, mudstone can slake and disintegrate into the grains with different sizes, which cause numerous problems of erosion and slope instability. Thus, studying the influence factors for the strength attenuation of mudstone in the process of slaking and disintegration is of great engineering significance. On the basis of the red mudstone with low strength and weak expansion in the lower part of the waterway slope in the in-situ test project of the water diversion of the Yangtze River to Huaihe River in China, a method for disintegration tests regarding natural constrained condition is developed to study the variation characteristics of fracture development, particle composition, disintegration ratio, shear resistance and strength parameters. The results show that there is a critical number of wetting-drying cycle effects. Before the seventh wetting-drying cycle, the parameters of mudstone samples change significantly, including increase of fissures, percentage of fine particles, reduction of disintegration ratio, reduction of shear resistance and reduction of strength parameters. After the seventh wetting-drying cycle, the changes of these parameters are not obvious. The characteristics of the disintegration behaviors are independent of the critical grain size Dcr of the complete disintegration, and the decreasing trends of the disintegration index IDi and disintegration ratio DR are similar. The highly positive correlation between the strength parameters and the disintegration ratio DR indicates that wetting-drying cycles are the factor that induces rock slaking, and the particle composition and state changes of samples play a role in the strength attenuation, and the disintegration resistance rate is a quantitative index of particle composition and state.
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  • 收稿日期:  2018-11-06
  • 发布日期:  2019-10-24

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