动水位作用下饱和粗颗粒土渗流多尺度耦合模拟

doi:10.13722/j.cnki.jrme.2016.1529

摘要
图/表
参考文献(25)
相关文章 (15)

全文: PDF (975 KB) HTML (1 KB)
输出: BibTeX | EndNote (RIS)

摘要

为了获得饱和颗粒土渗流时内部错综复杂的动态响应机制，模拟洪水位上升过程中，堤基采用防渗板桩时内部流体–土颗粒的耦合过程。采用Navier-Stokes方程来描述孔隙水流，以线性角动量方程及离散元来描述颗粒状态，应用半经验公式来量化流体–颗粒之间的相互作用，引入离散格子玻尔兹曼方法实现瞬态耦合，借助土工离心机相似准则来建立二维耦合模型。研究发现：随着堤前水头差的增大，堤基中流体和颗粒之间耦合作用会持续发生，导致堤基上游河床沉降，下游凸起，直到发生渗透破坏。该模型从中尺度层面可获得模拟孔隙水流，获得渗流水头等势线、渗流速度及渗流路径；从微观尺度模拟砂性地基土壤颗粒的位移与变形，如颗粒运动过程、孔隙率、临界坡降及颗粒间相互作用力动态变化规律等；该模型对于分析砂性土在复杂情况下动力学过程方面提供了一个有效的工具，实现了水–土–结构三者之间的动态响应及耦合过程模拟。

	服务

	把本文推荐给朋友
	加入我的书架
	加入引用管理器
	E-mail Alert
	RSS
	作者相关文章
	毛海涛1
	2
	王晓菊3
	王正成1
	吴恒滨1

关键词 ：土力学, 粗颗粒土, 多尺度模型, 渗透, 耦合

Abstract：

In order to obtain the perplexing response mechanism of saturated granular soils，in this paper，a fully coupled model was employed to simulate a sheet pile wall subjected to an increasing water pressure that mimics a flooding scenario，and to analyze the mesoscale pore fluid flow and microscale solid phase deformation of saturated granular soils. The fluid motion was idealized using averaged Navier-Stokes equation；the discrete element method and the linear angular momentum equation were employed to model the assemblage of solid particles. The fluid-particles interaction was quantified using established semiempirical relationships. Besides，Boltzmann method of discrete lattice was introduced to achieve Instantaneous coupling，using the similarity criterion of geotechnical centrifuge to establish a 2D coupling model. It is founded that the coupling effect between the fluid and the particles will be ongoing with the waterhead increasing，caused the upstream riverbed sedimentation and downstream uplift，until the seepage failur was happened. The model simulated the pore water at mesoscale，we can get the equipotential line，seepage velocity and seepage path；To simulates displacement and deformation of particles at microscale，such as：motion process soil particles，the porosity，critical gradient and dynamic change law of interaction force between particles，etc. The model provided an effective tool which can analyze the dynamic process of sandy soil in complicated conditions，achieve the dynamic response and simulation of among water，soil and structure.

Key words： soil mechanics coarse soil multi-scale model permeation coupling

引用本文:

毛海涛1，2，王晓菊3，王正成1，吴恒滨1. 动水位作用下饱和粗颗粒土渗流多尺度耦合模拟[J]. 岩石力学与工程学报, 2018, 37(S1): 3796-3804.
MAO Haitao1，2，WANG Xiaoju3，WANG Zhengcheng1，WU Hengbin1. Seepage of saturated coarse soil multi-scale coupling simulation with dynamic water level. , 2018, 37(S1): 3796-3804.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2016.1529 或 https://rockmech.whrsm.ac.cn/CN/Y2018/V37/IS1/3796

[1]	周健，姚志雄，张刚. 砂土渗流过程的细观数值模拟[J]. 岩土工程学报，2007，29(7)：977-981.(ZHOU Jian，YAO Zhixiong，ZHANG Gang. Mesomechanical simulation of seepage flow in sandy soil[J]. Chinese Journal of Geotechnical Engineering，2007，29(7)：977-981.(in Chinese))
[2]	徐卫亚，邢万波，魏文白，等. 堤防失事风险分析和风险管理研究[J].岩石力学与工程学报，2006，25(1)：47-55.(XU Weiya，XING Wanbo，WEI Wenbai，et al. Risk analysis and risk management for leveesfailure[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(1)：47-55.(in Chinese))
[3]	JACKSON R，SHATTUCK M D. The dynamics of fluidized particles[J]. Measurement Science andTechnology，2001，69(12)：368.
[4]	ELMEKATI A，SHAMY U E. A practical co-simulation approach for multiscale analysis of geotechnical systems[J]. Computers andGeotechnics，2010，37(4)：494-503.
[5]	ANDERSON T，JACKSON R. A ?uid mechanical description of ?uidized beds[J]. Industrial and Engineering Chemistry Research Fundamentals，1967，64：527-539.
[6]	周健，池永. 砂土力学性质的细观模拟[J]. 岩土力学，2003，24(6)：901-906.(ZHOU Jian，CHI Yong. Mesomechanical simulation of sand mechanical properties[J]. Rock and Soil Mechanics，2003，24(6)：901-906. (in Chinese))
[7]	张建民. 砂土动力学若干基本理论探究[J]. 岩土工程学报，2012，34(1)：1-50.(ZHANG Jianmin. New advances in basic theories of sand dynamics[J]. Chinese Journal of Geotechnical Engineering，2012，34(1)：1-50.(in Chinese))
[8]	MEGURO K，RAVICHANDRAN N. 3-Dimensional distinct element simulation of liquefaction phenomena[J]. Monthly Journal of the Institute of Industrial Science University of Tokyo，2000，52：598-601.
[9]	SHAMY U E，AYDIN F. Multiscale modeling of flood-induced piping in river levees[J]. Journal of Geotechnical andGeoenvironmentalEngineering，2008，134(9)：1385-1398.
[10]	LADD A J C. Numerical simulations of particulate suspensions via a discretized Boltzmann equation. Part 2. Numerical results[J]. Journal of Fluid Mechanics，1994，271：285-309.
[11]	TOMLINSON S S，VAID Y P. Seepage forces and confining pressure effects on piping erosion[J]. Canadian Geotechnical Journal，1997，37(1)：1-13.
[12]	ITASCA CONSULTING GROUP. Particle flow code in 3 dimensions[M]. Minneapolis，MN：[s. n.]，2008：32-38.
[13]	BENMEBAREK N S，KASTNER R. Numerical studies of seepage failure of sand within a cofferdam[J]. Computers and Geotechnics，2005，32(4)：264-273.
[14]	LEHMANN P，STAHLI M，PAPRITZ，et al. A fractal approach to model soil structure and to calculate thermal conductivity of soils[J]. Transport in Porous Media，2003，52：313-332.
[15]	SHAMY U E，AYDIN F. A micro-scale model for the analysis of flood-induced piping in river levees[C]// Geo-Denver.[S. l.]：[s. n.]，2007：1-10.
[16]	ERGUN S. Fluid flow through packed columns[J]. Chem.，Eng.，Prog.，1952，48(2)：89-94.
[17]	AL-RAOUSH R，WILLSON C S. A pore-scale investigation of a multiphase porous media system[J]. Journal of Contaminant Hydrology，2005，77：67-89.
[18]	BRADFORD S A，LEIJJ F J. Predicting two- and three-fluid capillary pressure-saturation relationships of porous media with fractional wetstability[J]. Water Resource，1996，32(2)：251-259.
[19]	NAKASHIMA H. Discrete element method(DEM) and its possible application[J]. SICE Annual Conference in Sapporo，2004，(2)：1104-1107.
[20]	杜延龄. 大型土工离心机基本设计原则[J]. 岩土工程学报，1993，15(6)：10-17.(DU Yanling. Fundamental design principles of large geotechnical centrifug[J]. Chinese Journal of Geotechnical Engineering，1993，15(6)：10-17.(in Chinese))
[21]	张丙印，张美聪，孙逊. 土石坝横向裂缝的土工离心机模型试验研究[J]. 岩土力学，2008，29(5)：1254-1258.(ZHANG Binyin，ZHANG Meicong，SUN Xun. Centrifugal modeling of transverse cracking in earth core dams[J]. Rock and Soil Mechanics，2008，29(5)：1254-1258.(in Chinese))
[22]	FUGLSANG L D，OVESEN N K. The application ofthetheory of modelling to centrifuge studies[C]// CRAIG W H，JAMES R G，SCHOFIELD AN，ed.Centrifuge inSoil Mechanics. [S. l.]：Balkema，Rotterdam，1988：119-138.
[23]	周健，池永. 砂土力学性质的细观模拟[J]. 岩土力学，2003， 24(6)：901-906.(ZHOU Jian，CHI Yong. Mesomechanical simulation ofsand mechanical properties[J]. Rock and Soil Mechanics，2003， 24(6)：901-906.(in Chinese))
[24]	刘洋，李飞，柴小庆. 渗流的PFC-CFD耦合细观数值模拟[J]. 水文地质工程地质，2008，35(2)：66-70.(LIU Yang，LI Fei，CHAI Xiaoqing，et al. A PFC-CFD coupled model in meso-scale for seepage[J].Hydrogeology and Engineering Geology，2008，35(2)：66-70.(in Chinese))
[25]	TAKBIRI Z，AFSHAR A. Multi-objective optimization of fusegates system under hydrologic uncertainties[J]. Water Resources Management，2012，26(8)：2323-2345.