文章摘要
王佳妮, 马戌, 张晓明.干湿循环下崩岗土体裂隙发育对其渗透性能的影响[J].水土保持学报,2021,35(1):90~95,102
干湿循环下崩岗土体裂隙发育对其渗透性能的影响
Effect of Fissure Development of Collapsed Soils on Their Permeability Under Dry-wet Cycle
投稿时间:2020-07-23  
DOI:10.13870/j.cnki.stbcxb.2021.01.013
中文关键词: 崩岗  干湿循环  饱和渗透系数  裂隙
英文关键词: Benggang  dry-wet cycle  permeability coefficient  fissures
基金项目:国家自然科学基金项目(41771307,41201271);长江科学院开放研究基金项目(CKWV2017522/KY)
作者单位E-mail
王佳妮1, 马戌1,2, 张晓明1 1. 华中农业大学资源与环境学院, 武汉 430070

2. 西北农林科技大学水土保持研究所
, 陕西 杨凌 712100 
zxm_huanong@mail.hzau.edu.cn 
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中文摘要:
      渗透是崩壁降雨重分布的关键且直接影响其重力侵蚀过程。试验设计6次干湿循环,通过进行崩壁4层土壤的饱和渗透试验并结合数字图像处理技术,研究了干湿循环效应下崩壁4层土的裂隙演化规律及其对各层土饱和渗透性能的影响。结果表明:(1)随干湿循环次数的增加,表土层和红土层裂隙发育明显,裂隙率逐渐增加后趋于稳定,过渡层和砂土层几乎没有产生裂隙;表土层在第3次循环后裂隙几乎发育完全,裂隙率达到3.50%,形态纤细且破碎,而红土层在第1次循环后裂隙骨架基本定型,随着干湿循环的进行,裂隙宽度不断增大至一定程度时不再发生变化;(2)4层土壤渗透系数大小为砂土层 > 过渡层 > 红土层 > 表土层,表土层和红土层渗透系数随干湿循环的进行逐渐增加后趋于稳定,过渡层一直比较稳定,砂土层逐渐减小后趋于稳定;(3)土壤裂隙率与渗透系数之间存在二次函数关系,裂隙发育对土壤渗透性能的影响先增大后减小。研究结果可为降雨入渗-重分布下崩壁失稳机理研究提供科学依据。
英文摘要:
      Infiltration is critical to the redistribution of rainfall in a collapsed wall and directly affects its gravity erosion process. In this study, the experiment designed six dry-wet cycles, and through saturated infiltration experiments of four layers of soil fissures and digital image processing technology, the evolution of four layers of soil fissures under the effect of dry-wet cycles and its influence on saturated soil permeability of each soil layer were studied. The results showed that: (1) With the increasing of the wet and dry cycles, the fissures in the topsoil layer and the laterite layer developed obviously, the fissure rate gradually increased and then tended to be stable, while the transition layer and sand layer had almost no fissures. The fissures of the topsoil were almost completely developed after the third cycle, and the fissure rate reached 3.50%. The fissures were slender and broken. However, for the laterite, after the first cycle, the fissures were basically fully fixed, the fracture width would remain unchanged when it increased to a certain extent with the progress of the dry-wet cycle. (2) The soil permeability coefficient of the four layers followed the order of sandy soil layer > transition layer > laterite layer > topsoil layer. With the increasing of the number of wet and dry cycles, the permeability coefficients of the topsoil layer and the laterite layer gradually increased and then tended to be stable, the transition layer was relatively stable, and the sand layer gradually decreased and then tended to be stable. (3) There was a quadratic function relationship between the soil fissure rate and the permeability coefficient. The impact of fissure development on soil permeability increased first and then decreased. The results could provide a scientific basis for the study of the mechanism of wall collapse instability under rainfall infiltration and redistribution.
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