膨胀土收缩开裂特性研究

唐朝生; 施斌; 刘春

膨胀土收缩开裂特性研究

南京大学地球科学与工程学院南京 210093

基金项目:

国家自然科学基金项目(41072211); 江苏省自然科学基金项目(BK2011339)和高等学校博士学科点专项科研基金(新教师基金课题)(20090091120037)

详细信息

作者简介:
唐朝生,主要从事环境岩土工程和工程地质方面的研究工作. Email: tangchaosheng@nju.edu.cn

中图分类号: TU44
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出版历程
- 收稿日期: 2012-05-20
- 修回日期: 2012-05-27
- 刊出日期: 2012-10-25

STUDY ON DESICCATION CRACKING BEHAVIOUR OF EXPANSIVE SOIL

School of Earth Sciences and Engineering, Nanjing University, Nanjing 210093

摘要

摘要: 在干燥环境中,由于蒸发失水,膨胀土发生收缩,表面容易产生纵横交错的裂隙网络(龟裂)。龟裂的产生会极大弱化土体的工程性质,并导致各种工程问题。随着极端干旱气候的频发,膨胀土龟裂问题将会越来越多,越来越显著。开展龟裂研究对揭示龟裂现象的本质规律和指导膨胀土地区的工程实践有重要意义。龟裂的形成和发展是一个动态的过程,与土中水分的蒸发速率、应力状态、收缩特性等直接相关:龟裂形成时水分蒸发处于常速率阶段; 吸力和抗拉强度是制约龟裂形成的两个关键力学参数,当土体中的吸力引起的张拉应力超过土体的抗拉强度时,龟裂便会产生; 龟裂是孔隙发生收缩的直观表现。总体上,力的作用和收缩空间是土体龟裂形成的两个必要条件。此外,膨胀土龟裂具有非常复杂的发生发展过程,受土质学、土力学、土结构、试验条件和方法等许多因素的影响。龟裂定量分析是龟裂研究的重要内容之一,能为龟裂机理研究及相关理论模型的建立提供必要参数。计算机图形处理技术具有效率高、操作性强、精度高等优点,为龟裂定量分析提供了强有力的工具。目前关于土体龟裂研究还存在许多不足之处,在今后的工作中,应该重视龟裂形成和发展过程的动态特征,围绕与土体龟裂相关的水-土作用关系、力学机制、收缩变形机制、大尺度现场试验和三维观测分析技术等方面开展更多的针对性研究,综合考虑龟裂形成过程中的土质学、土力学和土结构因素,结合宏观现象与微观分析,建立土体龟裂的理论体系。
- 膨胀土 /
- 龟裂 /
- 水分蒸发 /
- 体积收缩 /
- 微观结构 /
- 土吸力 /
- 抗拉强度 /
- 定量分析
Abstract: Upon drying, the evaporation of soil water results in volumetric shrinkage and desiccation cracks on expansive soils. The presence of crack can significantly weaken the engineering properties of soil, and cause various problems in geological, geotechnical, hydraulic, environmental engineering fields. With the increasing frequency of severe drought climate, the engineering problems that induced by desiccation cracking can be more and more, worse and worse. The study of desiccation cracking is therefore very significant for revealing the intrinsic mechanisms behind this common natural phenomenon, and plays an important role in engineering practice in clayey soil areas and especially in expansive soil areas. Generally, the initiation and propagation of desiccation cracks show evident dynamic characteristics and significantly depend on soil water evaporation rate, stress state and shrinkage property. The cracks initiate at constant evaporation rate stage. Soil suction and tensile strength are the two key mechanical parameters that control the cracking behavior. Cracking is likely to occur if the tensile stress which is induced by soil suction reaches the tensile strength of soil. Intrinsically, cracking is the result of pore shrinkage. It is believed that the mechanical effect and shrinkage potential are the two necessary factors for crack initiation. It is found that the desiccation cracking behaviour is affected by many factors including soil materials, mechanical properties, structures, test conditions, and test methods. Quantitative characterization of crack patterns is required for desiccation cracking investigation, and plays very important role in understanding the cracking mechanism and constructing the relevant model. Image processing is a powerful, efficient and high-accurate tool for quantitative description crack patterns. In the next stage, more attention should be paid to the dynamic characteristics of cracking, and more work should be done on water-soil interaction, mechanical mechanism, shrinkage mechanism, large scale field test and 3D quantification technique that related to soil desiccation cracking. It is also important to study desiccation cracking behaviour on the basis of soil materials, mechanics and structures, to integrate macro-observation with micro-analysis and to construct perfect theory for characterizing desiccation cracking.
- Expansive soil /
- Desiccation crack /
- Water evaporation /
- Volumetric shrinkage /
- Microstructure /
- Soil suction /
- Tensile strength /
- Quantitative analysis

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参考文献(1)

[1] Nelson J D,Miller D J.Expansive soils: problems and practice in foundation and pavement engineering[J]. John Wiley, New York, 1992.

[2] Lloyd-Hughes B.the long-range predictability of European drought.Thesis of University of London, 2002.

[3] Morris P H,Graham J,Wiliams D J.Cracking in drying soils[J]. Canadian Geotechnical Journal, 1992, 29: 263~267.

[4] Boyntjon S S,Daniel D E.Hydraulic conductivity tests on compacted clay[J]. ASCE J. Geotech. Engrg., 1985, 114 (4): 465~478.

[5] Albrecht B A.Benson C H.Effect of desiccation on compacted natural clays[J]. ASCE,J. of Geotech. and Geoenvir. Engrg., 2001, 1271: 67~75.

[6] Sherard J L.Embankment dam cracking[M].In: Embankment-dam Engineering(Casagrande Volume)[J].John Wiley & Sons, New York, 1973,271~353.

[7] Lazanye L,Horvath G,Farkas J.Volume change induced cracking of flood protection dikes built of clay.In Proceeding of the 2nd International Conference on Unsaturated Soils. Beijing: International Academic Publishers, 1998,213~218.

[8] Miller C J.Field investigation of clay liner movement[J]. Hazardous Waste and Hazardous Materials, 1988, 5 (3): 231~238.

[9] Miller C J,Mi H,Yesiller N.Experimental analysis of desiccation crack propagation in clay liners[J]. Journal of the American Water Resources Association, AWRA, 1998, 34 (3): 677~686.

[10] 姚海林, 郑少河,陈守义.考虑裂隙及雨水入渗影响的膨胀土边坡稳定性分析[J].岩土工程学报, 2001, 23 (5): 606~609.

Yao Hailin, Zheng Shaohe, Chen Shouyi. Analysis on the slope stability of expansive soils considering cracks and infiltration of rain. Chinese Journal of Geotechnical Engineering, 2001, 23 (5): 606~609.

[11] Baker R.Tensile strength, tension cracks, and stability of slopes. Soils and Foundations, 1981, 21 (2): 1~17.

[12] 袁俊平, 殷宗泽.膨胀土裂隙的量化指标与强度性质研究[J].水利学报, 2004,(6): 108~113.

Yuan Junping, Yin Zengze. Quantitative index of fissure and strength characteristics of fissured expansive soils. Journal of Hydraulic Engineering, 2004,(6): 108~113.

[13] 孔令伟, 陈建斌,郭爱国,等.大气作用下膨胀土边坡的现场响应试验研究[J].岩土工程学报, 2007, 29 (7): 1065~1073.

Kong Lingwei, Chen Jianbin, Guo Aiguo, et al. Field response tests on expansive soil slopes under atmosphere. Chinese Journal of Geotechnical Engineering, 2007, 29 (7): 1065~1073.

[14] Stolte J,Ritsema C J,Roo A P J.Effects of crust and cracks on simulated catchment discharge and soil loss[J]. Journal of Hydrology, 1997, 195: 279~290.

[15] Bronswijk J J B,Hamminga W,Oostindie K.Field scale solute transport in a heavy clay soil[J]. Water Resources Research, 1995, 31: 517~526.

[16] Boynton S S,Daniel D E.Hydraulic conductivity tests on compacted clay[J]. ASCE Journal of Geotechnical Engineering, 1985, 111 (4): 465~478.

[17] Lau J T K.Desiccation cracking of clay soils.M.Sc.thesis, Department of Civil Engineering. University of Saskatchewan, Saskatoon, Canada, 1987.

[18] Chertkov V Y.Modelling cracking stages of saturated soils as they dry and shrink[J]. European Journal of Soil Science, 2002, 53: 105~118.

[19] Abu-Hejleh A N,Znidarcic D.Desiccation theory for soft cohesive soils[J]. ASCE Journal of Geotechnical Engineering, 1995, 121 (6): 493~502.

[20] Fang H Y.Introduction to Environmental Geotechnology[M]. CRC Press, Boca Raton. FL.1997.

[21] Konrad J M,Ayad R.An idealized framework for the analysis of cohesive soils undergoing desiccation[J]. Canadian Geotechnical Journal, 1997, 34: 477~488.

[22] Konrad J M,Ayad R.Desiccation of sensitive clay: field experimental observations[J]. Canadian Geotechnical Journal, 1997, 34: 929~942.

[23] Ayad R,Konrad J M,Soulié M.Desiccation of a sensitive clay: Application of the model CRACK[J].Canadian Geotechnical Journal, 1997, 34: 943~951.

[24] Kayyal,M K.Effect of the moisture evaporative stages on the development of shrinkage cracks in soil.In: Proceedings of First International Conference on Unsaturated Soils, 1995,373~379.

[25] Yesiller N,Miller C J,Inci G,Yaldo K.Desiccation and cracking behavior of three compacted landfill liner soils[J]. Engineering Geology, 2000, 57: 105~121.

[26] Albrecht B A,Benson C H.Effect of desiccation on compacted natural clay[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2001, 127 (1): 67~75.

[27] Prat P C,Ledesma A,Lakshmikantha M R.Size effect in the cracking of drying soil. In Proceedings of the 16^th European Conference of Fracture(edited by EE Gdoutos),Springer, 2006.

[28] Nahlawi H,Kodikara J K.Laboratory experiments on desiccation cracking of thin soil layers[J]. Geotechnical and Geological Engineering, 2006, 24: 1641~1664.

[29] Rodríguez,R,Sánchez, M,Ledesma A,Lloret A.Experimental and numerical analysis of desiccation of a mining waste[J]. Canadian Geotechnical Journal, 2007, 44: 644~658.

[30] 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.

Tang Chaosheng, Shi Bin, Liu Chun, et al. Developing law and morphological analysis of shrinkage cracks of clay soil at different temperature. Chinese Journal of Geotechnical Engineering, 2007, 29 (5): 743~749.

[31] 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.

Tang Chaosheng, Shi Bin, Liu Chun, et al. Factors affecting of the surface shrinkage cracks' structure and morphology of clay soil and quantitative analysis. Journal of Hydraulic Engineering, 2007,(10): 1186~1193.

[32] Rayhani MHT,Yanful EK,Fakher A. Desiccation-induced cracking and its effect on the hydraulic conductivity of clayey soils from Iran[J]. Canadian Geotechnical Journal,2007, 44:276~283.

[33] 刘春, 王宝军,施斌,唐朝生.基于数字图像识别的岩土体裂隙形态参数分析方法[J].岩土工程学报, 2008, 30 (9): 1383~1388.

Liu Chun, Wang Baojun, Shi Bin, Tang Chaosheng. Analytic method of morphological parameters of cracks for rock and soil based on image processing and recognition. Chinese Journal of Geotechnical Engineering, 2008, 30 (9): 1383~1388.

[34] 施斌, 唐朝生,王宝军,姜洪涛.黏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, 15 (2): 2009,192~198.

Shi Bin, Tang Chaosheng, Wang Baojun, Jiang Hongtao. Development and mechanism of desiccation cracking of clayey soil under different temperatures. Geological Journal of China University, 2009, 25 (2): 192~198.

[35] Tang C S,Shi B,Liu C,Zhao L Z,Wang B J.Influencing factors of geometrical structure of surface shrinkage cracks in clayey soils[J]. Engineering Geology, 2008, 101 (3-4): 204~217.

[36] Péron H,Herchel T,Laloui L,Hu L B.Fundamentals of desiccation cracking of fine-grained soils: Experimental characterization and mechanisms identification[J]. Canadian Geotechnical Journal, 2009, 46: 1177~1201.

[37] Tang C S,Cui Y J,Tang A M,Shi B.Experiment evidence on the temperature dependence of desiccation cracking behavior of clayey soils[J]. Engineering Geology, 2010, 114: 261~266.

[38] Tang C S,Shi B,Liu C,Suo W B,Gao L.Experimental characterization of shrinkage and desiccation cracking in thin clay layer[J]. Applied Clay Science, 2011, 52: 69~77.

[39] Tang C S,Shi B,Liu C,Gao L,Inyang H.Experimental investigation on the desiccation cracking behavior of soil layer during drying[J]. Journal of Materials for Civil Engineering, 2010, 23 (6): 873~878.

[40] Corte A,Higashi A.Experimental research on desiccation cracks in soil.Research Report. U.S.Army Snow Ice and Permafrost Research Establishment, Illinois, USA, 1960.

[41] Fredlund D G,Rahardjo H.Soil Mechanics for Unsaturated Soils[M]. New York: Wiley, 1993.

[42] Kleppe J,Olson R.Desiccation cracking of soil barriers. Hydraulic barriers in soil and rock, STP 874,ASTM,Philadelphia, 1985, 263~275.

[43] Wilding L P,Tessier D.Genesis of vertisols: Shrink-swell phenomena. In Vertisols: Their Distribution, Properties, Classification and Management, Wilding L P,Puentes R,Eds. Technical Monograph No.18,Soil Management Support Services: Texas A & M,TX, 1988,55~81.

[44] Tay Y Y,Stewart D Ⅰ,Cousens T W.Shrinkage and desiccation cracking in bentonite-sand landfill liners[J]. Engineering Geology, 2001, 60: 263~274.

[45] Vogel H J,Hofmann H,Roth K.Studies of crack dynamics in clay soil Ⅰ: Experimental methods, results, and morphological quantification[J]. Geoderma, 2005, 125: 203~211.

[46] 唐朝生, 崔玉军,Anh-Minh Tang,施斌.膨胀土收缩开裂过程的温度效应[J].岩土工程学报,待刊.

Tang Chaosheng, Cui Yujun, Tang Anh-Minh, Shi Bin. Temperature dependence of shrinkage and desiccation cracking process of expansive soil. Chinese Journal of Geotechnical Engineering(in press).

[47] 唐朝生, 崔玉军,Anh-Minh Tang,施斌.土体干燥过程中体积收缩变形特征[J].岩土工程学报, 2011, 33 (8): 1271~1279.

Tang Chaosheng, Cui Yujun, Tang Anh-Minh, Shi Bin. Soil volume shrinkage characteristics during drying. Chinese Journal of Geotechnical Engineering, 2010, 33 (8): 1271~1279.

[48] 唐朝生, 施斌.干湿循环过程中膨胀土的胀缩变形特征[J].岩土工程学报, 2011, 33 (9): 1376~1384.

Tang Chaosheng, Shi Bin. Swelling and shrinkage behaviour of expansive soil during wetting-drying cycles. Chinese Journal of Geotechnical Engineering, 2010, 33 (9): 1376~1384.

[49] Towner G D.the influence of sand-and silt-size particles on the cracking during drying of small clay-dominated aggregates[J]. Journal of Soil Science, 1988, 39: 347~356.

[50] Weinberger R.Initiation and growth of cracks during desiccation of stratified muddy sediments[J]. Journal of Structural Geology, 1999, 21: 379~386.

[51] Zabat M,Vayer-Besan on M,Harba R,Bonnamy S,Van Damme H.Surface topography and mechanical properties of smectite films. Progress in Colloid and Polymer Science.96~102.Berlin: Springer, 1997.

[52] Scherer G.W.Theory of drying[J]. Journal of the American Ceramic Society, 1990, 73: 3~14.

[53] Prat P C,Ledesma A,Cabeza L.Drying and cracking of soils: numerical modeling.In 8th Int. Conference on Numerical Models in Geomechanics NUMOG Ⅷ,705-711,Rome, ltaly, 2002.

[54] Morris P H,Graham J,Williams D J.Crack depths in drying clays using fracture mechanics. Fracture Mechanics Applied to Geotechnical Engineering. ASCE Geotechnical Special Publication, 1994,pp.40~53.

[55] Omidi G H,Thomas J C,Brown K W.Effect of desiccation cracking on the hydraulic conductivity of a compacted clay liner[J]. Water, Air and Soil Pollution, 1996, 89: 91~103.

[56] Daniel D E,Wu Y K.Compacted clay liners and covers for arid sites[J]. Journal of Geotechnical Engineering, ASCE, 1993, 119 (2): 223~237.

[57] Babu G L S,Gartung E.Methodology for prediction of desiccation of clay liners.In Clay science for Engineering, Adachi and Fukue eds., pages 187~190,Rotterdam. Balkema, 2001.

[58] Towner G.the tensile stress generated in clay through drying[J]. Journal Agricultural Engineering Research, New York, 1987, 37 (4): 279~289.

[59] Towner G D.the mechanics of cracking of drying clay[J]. J.Agric. Engrg. Res, 1987, 36: 115~124.

[60] Nearing M A,Parker S C,Bradford J M., Elliot W J.Tensile strength of thirty-three saturated repacked soils[J]. Soil Sci. Soc. Am. J., 1991, 55: 1546~1551.

[61] Tang C S,Shi B,Gao W,Chen F G,Cai Y.Strength and mechanical behavior of short polypropylene fiber reinforced and cement stabilized clayey soil[J]. Geotextiles and Geomembranes, 2007, 25: 194~202.

[62] Tang C S,Shi B,Zhao L Z.Interfacial Shear Strength of Fiber Reinforced Soil[J]. Geotextiles and Geomembranes, 2009, 28: 54~62.

[63] Tang C S,Cui Y J,Shi B,Tang A M,Liu C.Desiccation and cracking behaviour of clay layer from slurry state under wetting-drying cycles[J]. Geoderma, 2011, 166 (1): 111~118.

[64] Yong R N,Warkentin B P.Soil Properties and Behaviour[M]. Elsevier, Amsterdam, 1975.

[65] Perrier E.Structure Géometrique et Fon ctionnement Hydrique des Sols: Simulations Exploratoires[M]. ORSTOM Editons, Paris, 1995,259.

[66] Perrier E,Mullon C,Rieu M.Computer construction of fractal soil structures: simulation of their hydraulic and shrinkage properties[J]. Water Resour. Res, 1995, 31: 2927~2943.

[67] Ringrose-Voase A J,Sanidad W B.A method for measuring the development of surface cracks in soils[J]. Application to crack development after lowland rice. Geoderma, 1996, 71: 245~261.

[68] Wopereis M C S,Bouma J,Kropff M J,Sanidad W.Reducing bypass flow through a dry, cracked and previously puddle rice soil[J]. Soil Tillage Res., 1994, 29: 1~11.

[69] Zein el Adebine A,Robinson G H.A study on cracking in some Vertisols of the Sudan[J]. Geoderma, 1971, 5: 229~241.

[70] Inoue H.Lateral flow in a clayey agricultural field with cracks[J]. Geoderma, 1993, 59: 311~325.

[71] Dasog G S,Shashidhara G B.Dimension and volume of cracks in a vertisol under different crop covers[J]. Soil Sci., 1993, 156: 424~428.

[72] Velde B.Structure of surface cracks in soil and muds[J]. Geoderma, 1999, 93: 101~12.

[73] Yan A.,Wu K., Zhang X.A quantitative study on the surface crack pattern of concrete with high content of steel fiber[J]. Cement and Concrete Research, 2002, 32: 1371~1375.

[74] Mi H.Kinematic Wave Formulation for Flow through Macroporous Soil.Ph. D.Thesis, Department of Civil and Environmental Engineering, Wayne State University, Detroit, MI, 1995.

[75] 易顺民, 黎志恒,张延中.膨胀土裂隙结构的分形特征及其意义[J].岩土工程学报, 1999, 21 (3): 294~298.

Yi Shunmin, Li Zhiheng, Zhang Yanzhong. The fractal characteristics of fracture in expansive soil and its significance. Chinese Journal of Geotechnical Engineering, 1999, 21 (3): 294~298.

[76] Lecocq N,Vandewalle N.Experimental study of cracking induced by desiccation in one-dimensional systems[J]. The European Physical Journal-E EDP Sciences, Springer-Verlag, Societ Italiana di Fisica, 2002, 84: 445~452.

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