Rock and Soil Mechanics ›› 2021, Vol. 42 ›› Issue (11): 3191-3201.doi: 10.16285/j.rsm.2021.0123

• Numerical Analysis • Previous Articles    

Simulation of seepage erosion in gap graded sand soil using CFD-DEM

LI Wei-yi1, 2, QIAN Jian-gu1, 2, YIN Zhen-yu3, ZHOU Chuang2   

  1. 1. College of Architecture and Civil Engineering, Xinjiang University, Urumqi, Xinjiang 830047, China; 2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 3. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
  • Received:2021-05-13 Revised:2021-08-23 Online:2021-11-11 Published:2021-11-12
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (52178345), the Fundamental Research Funds for the Central Universities Project (22120190220) and Fund for Research on the Monitoring Technology and the Analytical Model of the Shanghai Deep Drainage System.

PDF (Chinese)

506

Abstract: Seepage erosion can lead to the loss of particles in the soil with water flow, thereby changing the mechanical and hydraulic properties of the soil, and then causing the deformation and even damage of earth-rock dams in engineering. In this paper, the coupled CFD-DEM method is used to study the seepage erosion characteristics of gap-graded sandy soil, which is widely found in dam foundation, filter-base soil systems in earth-rock dams and gravel packing for sand control in oil and gas production, after reasonable simplification of its gradation. The effects of hydraulic gradient, confining pressure and fines content on seepage erosion in gap-graded sand soils were investigated through 8 groups of upward seepage simulation. Macroscopic phenomena such as the mass of fines loss, fines loss rate, soil surface settlement and microstructural changes were monitored in the tests and verified against previous indoor tests. The results showed that the effect of fines content on the mass of fines loss, peak fines loss rate and soil surface displacement from the numerical simulation was more significant than the effect of the confining pressure and hydraulic gradient in the tests. In addition, the analysis of microstructure demonstrated that the conversion of the soil force chain transfer structure occurred near the threshold of 25% fines content. The triaxial results indicated that the loss of fines also led to a decrease in peak strength and E50 modulu of soil.

Key words: coupled CFD-DEM, seepage erosion, fines content, hydraulic gradient, confining pressure, microstructure

CLC Number: 

  • TU 470
[1] LI Min, YU He-miao, DU Hong-pu, CAO Bao-yu, CHAI Shou-xi, . Mechanical properties of saline soil solidified with the mixture of lime, fly ash and modified polyvinyl alcohol under freeze-thaw cycles [J]. Rock and Soil Mechanics, 2022, 43(2): 489-498.
[2] GE Miao-miao, LI Ning, SHENG Dai-chao, ZHU Cai-hui, PINEDA Jubert, . Experimental investigation of microscopic deformation mechanism of unsaturated compacted loess under hydraulic coupling conditions [J]. Rock and Soil Mechanics, 2021, 42(9): 2437-2448.
[3] ZHOU Heng-yu, WANG Xiu-shan, HU Xing-xing, XIONG Zhi-qi, ZHANG Xiao-yuan, . Influencing factors and mechanism analysis of strength development of geopolymer stabilized sludge [J]. Rock and Soil Mechanics, 2021, 42(8): 2089-2098.
[4] LIU Xin, XU Hong-fa, FAN Peng-xian, GENG Han-sheng, MO Jia-quan, WANG De-rong. Experimental study on the stress wave attenuation effect of filled cracks in rocks under confining pressure [J]. Rock and Soil Mechanics, 2021, 42(8): 2099-2108.
[5] LIU Kang, CHEN Guo-xing, WU Qi, MA Wei-jia, QIN You, . Effects of cyclic loading directions on liquefaction characteristics of saturated coral sand [J]. Rock and Soil Mechanics, 2021, 42(7): 1951-1960.
[6] LIU Hai-feng, ZHENG Kun, ZHU Chang-qi, MENG Qing-shan, WU Wen-juan. Brittleness evaluation of coral reef limestone base on stress-strain curve [J]. Rock and Soil Mechanics, 2021, 42(3): 673-680.
[7] WANG Gang, ZHANG Xian-wei, LIU Xin-yu, XU Yi-qing, LU Jian-feng, . Compression characteristics and microscopic mechanism of Xiamen granite residual soil [J]. Rock and Soil Mechanics, 2021, 42(12): 3291-3300.
[8] CHEN Yu, LI Chuan-xun, FENG Cui-xia, . Analytical solution for one-dimensional consolidation of soft soils under a partially permeable boundary condition and a time-dependent loading considering the threshold hydraulic gradient [J]. Rock and Soil Mechanics, 2021, 42(11): 3008-3016.
[9] WANG Ke, SHENG Jin-chang, GAO Hui-cai, TIAN Xiao-dan, ZHAN Mei-li, LUO Yu-long, . Study on seepage characteristics of rough crack under coupling of stress-seepage erosion [J]. Rock and Soil Mechanics, 2020, 41(S1): 30-40.
[10] WANG Ming-nian, JIANG Yong-tao, YU Li, DONG Yu-cang, DUAN Ru-yu, . Analytical solution of startup critical hydraulic gradient of fine particles migration in sandy soil [J]. Rock and Soil Mechanics, 2020, 41(8): 2515-2524.
[11] ZHAO Yi-qing, WU Chang-gui, JIN Ai-bing, SUN Hao, . Experimental study of sandstone microstructure and mechanical properties under high temperature [J]. Rock and Soil Mechanics, 2020, 41(7): 2233-2240.
[12] ZHU Nan, LIU Chun-yuan, ZHAO Xian-hui, WANG Wen-jing, . Micro-structure characteristics of structured clay under different stress paths in K0 consolidated drained tests [J]. Rock and Soil Mechanics, 2020, 41(6): 1899-1910.
[13] HOU Zhi-qiang, WANG Yu, LIU Dong-qiao, LI Chang-hong, LIU Hao. Experimental study of mechanical properties of marble under triaxial unloading confining pressure after fatigue loading [J]. Rock and Soil Mechanics, 2020, 41(5): 1510-1520.
[14] DU Yu-xiang, SHENG Qian, WANG Shuai, FU Xiao-dong, LUO Hong-xing, TIAN Ming, WANG Li-wei, MEI Hong-ru. Study of microstructure and mechanical properties of semi-diagenetic rock of Xigeda Formation [J]. Rock and Soil Mechanics, 2020, 41(4): 1247-1258.
[15] LI Zong-ze, JIANG De-yi, FAN Jin-yang, CHEN Jie, LIU Wei, WU Fei, DU Chao, KANG Yan-fei. Experimental study of triaxial interval fatigue of salt rock [J]. Rock and Soil Mechanics, 2020, 41(4): 1305-1312.
Viewed
Full text


Abstract

Cited
  Shared   
  Discussed   
[1] LI Kui, GAO Bo. Study of construction schemes for metro tunnel crossing river and bridge[J]. , 2010, 31(5): 1509 -1516 .
[2] YANG Bing, YANG Jun, CHANG Zai, GAN Hou-yi, SONG Er-xiang. 3-D granular simulation for compressibility of soil-aggregate mixture[J]. , 2010, 31(5): 1645 -1650 .
[3] XIAO Shi-guo，XIAN Fei，WANG Huan-long. 一种微型桩组合抗滑结构内力分析方法[J]. , 2010, 31(8): 2553 -2559 .
[4] YE Hai-lin, ZHENG Ying-ren, HUANG Run-qiu, DU Xiu-li, LI An-hong4, XU Jiang-bo. Study of application of strength reduction dynamic analysis method to aseismic design of anti-slide piles for landslide[J]. , 2010, 31(S1): 317 -323 .
[5] ZHANG Zhi-pei, PENG Hui, RAO Xiao. Numerical simulation study of grouting diffusion process in soft soil foundation[J]. , 2011, 32(S1): 652 -0655 .
[6] WU Li-zhou , ZHANG Li-min , HUANG Run-qiu. Analytic solution to coupled seepage in layered unsaturated soils[J]. , 2011, 32(8): 2391 -2396 .
[7] LIU Run , WANG Xiu-yan , LIU Yue-hui , WANG Wu-gang. Thermal buckling analysis of submarine buried pipelines with isolated prop initial imperfection[J]. , 2011, 32(S2): 64 -69 .
[8] LIANG Yao-zhe. Analysis of active earth pressure of rigid pile composite foundation[J]. , 2012, 33(S1): 25 -29 .
[9] HAN Jian-xin , LI Shu-cai , LI Shu-chen , YANG Wei-min , WANG Lei . Study of post-peak stress-strain relationship of rock material based on evolution of strength parameters[J]. , 2013, 34(2): 342 -346 .
[10] HUANG Da , CEN Duo-feng , HUANG Run-qiu . Influence of medium strain rate on sandstone with a single pre-crack under uniaxial compression using PFC simulation[J]. , 2013, 34(2): 535 -545 .
Copyright © Rock and Soil Mechanics, All Rights Reserved.
Tel: 027-87198484, 87199252, 87199253, 87198752　E-mail: ytlx@whrsm.ac.cn
Powered by Beijing Magtech Co. Ltd