HE Daixun,ZHANG Jiaming,CHEN Mao,et al.Influence of Particle Size Composition on Desiccation Cracks of Red Clay[J].Research of Soil and Water Conservation,2022,29(05):185-191.
粒度组成对红黏土干缩裂隙影响
- Title:
- Influence of Particle Size Composition on Desiccation Cracks of Red Clay
- 文章编号:
- 1005-3409(2022)05-0185-07
- Keywords:
- engineering geology; desiccation crack; laboratory desiccation tests; red clay; particle size composition
- 分类号:
- X4; TU446
- 文献标志码:
- A
- 摘要:
- 为了探讨粒度组成对红黏土干缩裂隙发育的影响,从而给红黏土地区的工程建设及减灾防灾提供理论依据。通过室内干燥试验,研究了粒度组成对昆明呈贡红黏土饱和泥浆样的水分蒸发、干缩裂隙的形成和演化、表面干缩裂隙结构形态的影响。结果表明:(1)蒸发曲线分为4个阶段,常速率阶段是最重要阶段;(2)常速率阶段历时随粒径减小而增长,随粒径分布范围变大而减短;(3)蒸发速率与粒径、粒径分布范围的关系不明显;(4)干缩裂隙形成与演化过程分为5个阶段,受粒度组成影响最显著的是裂隙形成阶段;(5)粒度组成影响裂隙形成阶段历时、不同等级裂隙先后衍生关系、开裂曲线的分段性、裂隙网络结构和土块分布;(6)天然粒组样的干缩裂隙产生向上卷曲现象;(7)粒径分布范围越大,分布非均匀性越强,表面裂隙率越大,而粒径的影响不明显;(8)表面裂隙的分形维数随粒径减小而减小。综上,粒径分布范围和分布非均匀性显著影响红黏土的水分蒸发过程,干缩裂隙的形成和演化,表面干缩裂隙结构形态。
- Abstract:
- The effects of particle size composition on the development of desiccation cracks in red clay were studied. This study can provide a theoretical basis for engineering construction and disaster prevention in red clay areas. Through laboratory drying tests on saturated mud samples, the effects of particle size composition on the water evaporation, the formation and evolution of desiccation cracks, and the surface desiccation cracks structure morphology of red clay were investigated. The results show that:(1)the evaporation curves can be divided into four stages, and the constant rate stage is the most essential stage of the evaporation curves;(2)the decrease of particle size reduces the constant stage duration;(3)the increased spread of particle size distribution also reduces the duration of the constant rate stage;(4)there is no obvious relationship between evaporation rate and particle size, particle size distribution;(5)the formation and evolution of drying shrinkage cracks can be divided into five stages, and the most significant stage is the stage of desiccation crack formation;(6)particle size composition affects the duration of desiccation crack formation, derivative relationship of different grade desiccation cracks, segmentation of cracking curve, fracture network structure and soil block distribution; desiccation crack of natural grain specimens produces upward curl phenomenon;(7)particle size composition affects segmentation of cracking curve as well; the larger the particle size distribution spread, the stronger distribution non-uniformity of the desiccation cracks of red clay is, and the more significant surface crack rate is, the more significant no effect on the particle size is;(8)particle size composition affects the surface desiccation crack structure morphology and clod distribution on the surface of specimens; the decrease of particle size reduces the fractal dimension of surface cracks. Therefore, it can be concluded that particle size distribution and distribution non-uniformity deeply affect the process of water evaporation, formation and evolution of desiccation cracks, and the surface desiccation crack structure morphology of red clay. These research results can provide reference for reducing the disasters and taking precautions against the calamities to help the construction of the red clay soil area.
参考文献/References:
[1] Gidigasu M D. Laterite soil engineering:pedogenesis and engineering principles[M]. New York:Elsevier Scientific Publishing Company, 1976.
[2] 余培厚,曲永新,唐大雄.第二届全国红土工程地质研讨会[C].贵阳:贵州科技出版社,1991.
[3] Angelo B D, Bruand A, Qin J, et al. Origin of the high sensitivity of Chinese red clay soils to drought: Significance of the clay characteristics[J]. Geoderma, 2014,223:46-53.
[4] 谈云志,胡焱,邓永锋,等.偏高岭土协同石灰抑制红黏土收缩的行为与机制[J].岩土力学,2019,40(11):4213-4219.
[5] 陈爱军,张家生.基于线弹性力学的非饱和红黏土裂缝开展分析[J].自然灾害学报,2013,22(3):198-204.
[6] 张涟英,黄宏辉,郑甲佳.贵州高速公路红黏土边坡稳定分析[J].贵州大学学报:自然科学版,2014,31(3):105-110.
[7] 彭宏艳.红黏土在岩溶悬托型水库中的防渗作用[J].中国岩溶,1996,15(4):18-23.
[8] 吴让新,段尚琪,张寅晨,等.昆明地区连续干旱红黏土地质对铁塔稳定性影响的研究及措施[J].云南科技管理,2015,28(5):65-68.
[9] 唐朝生,施斌,刘春,等.影响黏性土表面干缩裂缝结构形态的因素及定量分析[J].水利学报,2007,38(10):1186-1193.
[10] 唐朝生,施斌,刘春,等.黏性土在不同温度下干缩裂缝的发展规律及形态学定量分析[J].岩土工程学报,2007,29(5):743-749.
[11] 施斌,唐朝生,王宝军,等.粘性土在不同温度下龟裂的发展及其机理讨论[J].高校地质学报,2009,15(2):192-198.
[12] 陈开圣.干湿循环下红黏土裂隙演化规律及对抗剪强度影响[J].水文地质工程地质,2018,45(1):89-95.
[13] 陈开圣.干湿循环下红黏土边坡裂隙演变规律[J].建筑科学与工程学报,2019,36(5):52-61.
[14] 熊俊豪,刘宝臣,刘磊,等.基于摄影法的红黏土裂隙试验研究[J].地下空间与工程学报,2020,16(2):381-387.
[15] 王美丽,高学杰,石英,等. RegCM4模式对云南及周边地区干旱化趋势的预估[J].高原气象,2015,34(3):706-713.
[16] 金燕,况雪源,晏红明,等.近55年来云南区域性干旱事件的分布特征和变化趋势研究[J].气象,2018,44(9):1169-1178.
[17] 徐海亮.六十年来全国与西南地区气象干旱及气候环境变化:以云南为例[J].昆明学院学报,2020,42(2):24-35.
[18] 唐朝生,崔玉军, Tang A M,等.膨胀土收缩开裂过程及其温度效应[J].岩土工程学报,2012,34(12):2181-2187.
[19] Liu C, Tang C S, Shi B, et al. Automatic quantification of crack patterns by image processing[J]. Computers & Geosciences, 2013,57:77-80.
[20] Richie J T. Dryland evaporative flux in a subhumid climate:I. micrometeorological inuences[J]. Agronomy Journal, 1971,63(1):51-55.
[21] Richie J T, Burnett E. Dry land evaporative flux in a subhumid climate:Ⅱ. plant influences[J]. Agronomy Journal, 1971,63(1):56-61.
[22] Idso R J, Reginato R D, Jackson R D, et al. The three stages of drying of a field soil[J]. Soil Science Society of America Journal, 1974,38(5):831-837.
[23] 唐朝生,施斌,顾凯.土中水分的蒸发过程试验研究[J].工程地质学报,2011,19(6):875-881.
[24] 唐朝生,施斌,崔玉军.土体干缩裂隙的形成发育过程及机理[J].岩土工程学报,2018,40(8):1415-1423.
备注/Memo
收稿日期:2021-07-09 修回日期:2021-08-15
资助项目:国家自然科学基金青年项目“强降雨条件下植被发育斜坡非饱和带土体大孔隙流试验研究”(41807258)
第一作者:何岱洵(1999—),男,广东茂名人,本科,主要从事红黏土干缩裂隙研究。E-mail:201811003445@stu.kust.edu.cn
通信作者:张家明(1984—),男,云南泸西人,博士,讲师,硕士生导师,主要从事工程地质及地质灾害防治研究。E-mail:zhangjiaming@kust.edu.cn