|
|
|
| EXPERIMENTAL STUDY OF THE MECHANISM OF FLOWING SOIL
FOR HOMOGENEOUS COHESIONLESS SOIL |
| HUANG Dewen1，2，CHEN Jiansheng1，2，CHEN Liang1，2，WANG Shuang1，2 |
(1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering，Hohai University，Nanjing，
Jiangsu 210098，China；2. Geotechnical Research Institute，Hohai University，Nanjing，Jiangsu 210098，China) |
|
|
|
|
Abstract The process of flowing soil in cohesionless soil was stimulated in laboratory tests to study the change rule among parameters such as permeability coefficient，hydraulic gradient and seepage discharge during seepage deformation. The cyclic process of preferential flow formation and development was analyzed in the process of seepage failure. Comparative tests were conducted to study the anti-permeability strength of soil after a period of consolidation. Results show that there is a period of steady fluid flow under low hydraulic gradient，during which the preferential flow has not formed and the permeability coefficient is a constant. The preferential flow induced by seepage is spatially variable in cohesionless soils. In the cycle of preferential flow formation，development，disappear and reformulation，the tiny seepage deformation happens all the time. In the broken area of flowing soils，the hydraulic screening changed the soil structures and reduced the anti-permeability strength.
|
|
|
|
|
|
| [1] TERZAGHI K. Der grundbruch an stauwerken und seine verhuetung[J]. Die Wasserkraft，1922，17(24)：445–449.
[2] KOENDERS M A，SELLMEIJER J B. Mathematical model for piping[J]. Journal of Geotechnical Engineering，1992，118(6)：943–946.
[3] BURNS B，BARKER R，GHATAORA G S. Investigating internal erosion using a miniature resistivity array[J]. Independent Nondestructive Testing and Evaluation International，2006，39(2)：169–174.
[4] KE L，TAKAHASHI A. Strength reduction of cohesionless soil due to internal erosion induced by one-dimensional upward seepage flow[J]. Soils and Foundations，2012，52(4)：698–711.
[5] 陈建生，刘建刚，焦月红. 接触冲刷发展过程模拟研究[J]. 中国工程科学，2003，5(7)：33–39.(CHEN Jiansheng，LIU Jiangang，JIAO Yuehong. Simulation study on the contact scouring development between underground layers[J]. Engineering Science，2003，5(7)：33–39.(in Chinese))
[6] 周红星，曹 洪. 双层堤基渗透破坏机制和数值模拟方法研究[J]. 岩石力学与工程学报，2011，30(10)：2 128–2 136.(ZHOU Hongxing，CAO Hong. Research on mechanism and numerical simulation method of seepage failure of double-layer dike foundation[J]. Chinese Journal of Rock Mechanics and Engineering，2011，30(10)：2 128–2 136.(in Chinese))
[7] 倪小东，王 媛，陆宇光. 隧洞开挖过程中渗透破坏细观机制研究[J]. 岩石力学与工程学报，2010，29(增2)：4 194–4 201.(NI Xiaodong，WANG Yuan，LU Yuguang. Study of meso-mechanism of seepage failure in tunnel excavation process[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(Supp.2)：4 194–4 201. (in Chinese))
[8] 毛昶熙，段祥宝. 关于渗流的力及其应用[J]. 岩土力学，2009，30(6)：1 569–1 574.(MAO Changxi，DUAN Xiangbao. On seepage forces and application[J]. Rock and Soil Mechanics，2009，30(6)：1 569–1 574.(in Chinese) )
[9] 唐益群，施伟华，张先林. 关于流土和管涌的试验研究和理论分析[J]. 上海地质，2003，(1)：25–31.(TANG Yiqun，SHI Weihua，ZHANG Xianlin. The experiments study and theoretical analyses of piping and flowsoil[J]. Shanghai Geology，2003，(1)：25–31.(in Chinese))
[10] 杨 建，蔡元奇，朱以文. 考虑应力状态的接触流土试验研究[J]. 人民长江，2010，41(7)：79–81.(YANG Jian，CAI Yuanqi，ZHU Yiwen. Experimental study on contact soil flow considering stress condition[J]. Yangtze River，2010，41(7)：79–81.(in Chinese))
[11] 刘 杰. 土的渗透稳定与渗流控制[M]. 北京：水利电力出版社，1992：38–52.(LIU Jie. Penetration stability and penetration control of the soil[M]. Beijing：Water Power Press，1992：38–52.(in Chinese))
[12] 陈建生，何文政，王 霜，等. 双层堤基管涌破坏过程中上覆层渗透破坏发生发展的试验与分析[J]. 岩土工程学报，2013，35(10)：1 777–1 783.(CHEN Jiansheng，HE Wenzheng，WANG Shuang，et al. Laboratory tests on development of seepage failure of overlying layer during piping of two-stratum dike foundation[J]. Chinese Journal of Geotechnical Engineering，2013，35(10)：1 777–1 783. (in Chinese))
[13] 梁 越，陈建生，陈 亮. 孔隙流动数值模拟建模方法及孔隙流速分布规律[J]. 岩土工程学报，2011，33(7)：1 104–1 109.(LIANG Yue，CHEN Jiansheng，CHEN Liang. Numerical simulation model for pore flows and distribution of their velocity[J]. Chinese Journal of Geotechnical Engineering，2011，33(7)：1 104–1 109.(in Chinese))
[14] 李伟莉，金昌杰，王安志，等. 土壤大孔隙流研究进展[J]. 应用生态学，2007，18(4)：888–894.(LI Weili，JIN Changjie，WANG Anzhi，et al. Research progress in soil macropore flow[J]. Chinese Journal of Applied Ecology，2007，18(4)：888–894.(in Chinese))
[15] 程竹华，张佳宝. 黄淮海平原三种土壤中优势流现象的试验研究[J]. 土壤学报，1999，36(2)：154–161.(CHENG Zhuhua，ZHANG Jiabao. Experimental studies on preferential flow in three soil in Huanghuaihai plain[J]. Acta Pedologica Sinica，1999，36(2)：154–161.(in Chinese))
[16] QUISENBERRY V L，PHILLIPS R E，ZELEZNIK J M. Spatial distribution of water and chloride macropore flow in a well-structured soil[J]. Soil Science Society of America Journal，1994，58(5)：1 294–1 300.
[17] WILDENSCHILD D，JENSEN K H，VILLHOLTH K，et al. A laboratory analysis of the effect of macropores on solute transport[J]. Ground Water，1994，32(3)：381–389. |
|
|
|
2015, Vol. 34 
