Volume 21 Issue 2
Apr.  2013
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XU Xiaofeng, WEI Houzhen, MENG Qingshan, WEI Changfu, LI Yonghe. 2013: DEM SIMULATION ON EFFECT OF COARSE GRAVEL CONTENT TO DIRECT SHEAR STRENGTH AND DEFORMATION CHARACTERISTICS OF COARSE-GRAINED SOIL. JOURNAL OF ENGINEERING GEOLOGY, 21(2): 311-316.
Citation: XU Xiaofeng, WEI Houzhen, MENG Qingshan, WEI Changfu, LI Yonghe. 2013: DEM SIMULATION ON EFFECT OF COARSE GRAVEL CONTENT TO DIRECT SHEAR STRENGTH AND DEFORMATION CHARACTERISTICS OF COARSE-GRAINED SOIL. JOURNAL OF ENGINEERING GEOLOGY, 21(2): 311-316.

DEM SIMULATION ON EFFECT OF COARSE GRAVEL CONTENT TO DIRECT SHEAR STRENGTH AND DEFORMATION CHARACTERISTICS OF COARSE-GRAINED SOIL

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  • Received Date: 2012-05-20
  • Rev Recd Date: 2012-07-22
  • Publish Date: 2013-04-25
  • Mechanical behaves of coarse grained soil is greatly influenced by the content of coarse gravels. The shear characteristics of four groups of strong weathered basalt coarse grained soils are investigated under different coarse gravel contents on large-scale direct shear apparatus to obtain the strength and deformation parameters in this paper. Based on the theory of discrete element method(DEM),four direct shear samples under vertical pressure of 100kPa are carried out using the parallel bond model(PBM)with multiplicity coarse gravel content. The parameters are calibrated. Then we simulate the relationship among shear stress, shear deformation and vertical deformation. The simulation also simultaneously analyzes the particle movement and force in order to settle the mechanism for the fact that coarse content affects shearing properties. Results show that the inherence for shear strength increasing with the increase of coarse gravel content at the same vertical stress is due to the increase of particle stiffness and the increase of friction coefficient. The peak of stress-strain curve can be well simulated by the PBM.But the soften segment cannot be well fitted. Simulation of shear-vertical displacement curve does not fit perfectly to the testing value. The effects of coarse particles on the peak force chains were significantly evident than those of fine particles during the shearing process. It is considered that the vortex area is the thickness of shear band, approximately 1/3-1/5 of the height of shear box.
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  • [1] 韩 刚, 赵其华,彭社琴.峨眉山玄武岩岸坡深部差异风化岩体特征及成因[J].岩土工程学报, 2011, 33 (10): 1547~1553.

    Han Gang, Zhao Qihua, Peng Sheqin. Characteristics and formation mechanism of deep differential weathering rock mass in Emei mountain basalt canyon slope. Chinese Journal of Geotechnical Engineering, 2011, 33 (10): 1547~1553.

    [2] 郭庆国. 粗粒土的工程特性及应用[M].郑州: 黄河水利出版社, 1998.

    Guo Qingguo. The engineering properties and application of coarse granined soil. Zhengzhou: Yellow River Water Conservancy Press, 1998.

    [3] 饶锡保, 何晓民,刘鸣.粗粒含量对砾质土工程性质影响的研究[J].长江科学院院报, 1999, 16 (1): 21~25.

    Rao Xibao, He Xiaomin, Liu Ming. Influence of coarse-grained content on engineering properties of gravelly soil. Journal of Yangtze River Scientific Research Institute, 1999, 16 (1): 21~25.

    [4] 刘松玉, 童立元,邱钰,等.煤矸石颗粒破碎及其对工程力学特性影响研究[J].岩土工程学报, 2005, 27 (5): 505~510.

    Liu Songyu, Tong Liyuan, Qiu Yu, et al. Crushable effects on engineering mechanical properties of colliery wastes. Chinese Journal of Geotechnical Engineering, 2005, 27 (5): 505~510.

    [5] 魏厚振, 汪稔,胡明鉴,等.蒋家沟砾石土不同粗粒含量直剪强度特征[J].岩土力学, 2008, 29 (1): 48~51.

    Wei Houzhen, Wang Ren, Hu Mingjian, et al. Strength behavior of gravelly soil with different coarse-grained contents in Jiangjiagou ravine. Rock and Soil Mechanics, 2008, 29 (1): 48~51.

    [6] 王光进, 杨春和,张超,等.粗粒含量对散体岩土颗粒破碎及强度特性试验研究[J].岩土力学, 2009, 30 (12): 3649~3654.

    Wang Guangjin, Yang Chunhe, Zhang Chao, et al. Experimental research on particle breakage and strength characteristics of rock and soil materials with different coarse-grain contents. Rock and Soil Mechanics, 2009, 30 (12): 3649~3654.

    [7] 周凤玺, 赖远明.冻结砂土力学性质的离散元模拟[J].岩土力学, 2010, 31 (12): 4016~4020.

    Zhou Fengxi, Lai Yuanming. Simulation of mechanical behavior for frozen sand clay by discrete element method. Rock and Soil Mechanics, 2010, 31 (12): 4016~4020.

    [8] Cundall PA,Strack ODL.A discrete numerical model for granular assemblies. Géotechnique, 1979, 29 (1): 47~65.

    [9] 刘斯宏, 徐永福.粒状体直剪试验的数值模拟与微观考察[J].岩石力学与工程学报, 2001, 20 (3): 288~292.

    Liu Sihong, Xu Yongfu. Numerical simulation for a direct box shear test on granular material and microscopic consideration. Chinese Journal of Rock Mechanics and Engineering, 2001, 20 (3): 288~292.

    [10] Liu SH,Matsuoka H.Microscopic interpretation on a stress-dilatancy relationship of granular materials[J]. Soils and Foundations, 2003, 43 (3): 73~84.

    [11] Thornton C,Zhang L.Numerical simulations of the direct shear test[J]. Chemical Engineering and technology, 2003, 26 (2): 153~156.

    [12] 蒋明镜, 王富周,朱合华,等.密实散粒体宏微观特性的直剪试验离散元数值分析[J].河海大学学报(自然科学版), 2010, 38 (5): 538~544.

    Jiang Mingjing, Wang Fuzhou, Zhu Hehua, et al. Dem simulation of macro-micro mechanical properties of dense granular materials in the direct shear test. Journal of Hohai University(Natural Sciences), 2010, 38 (5): 538~544.

    [13] 张刚. 管涌现象细观机理的模型试验与颗粒流数值模拟研究(博士学位论文) [D].上海: 同济大学, 2007.

    Zhang Gang. Researches on Meso-Scale Mechanism of Piping Failure by Means of Model Test and Pfc Numerical Simulation. Shanghai: Tongji University, 2007.

    [14] Fu Y.Experimental Quantification and DEM Simulation of Micro-Macro Behaviors of Granular Materials Using X-Ray Tomography Imaging [D]. Baton Rouge: Louisiana State University, 2005.

    [15] Härtl J,Ooi J Y.Experiments and simulations of direct shear tests: Porosity, contact friction and bulk friction[J]. Granular Matter, 2008, 10 (4): 263~271.

    [16] 贾学明, 柴贺军,郑颖人.土石混合料大型直剪试验的颗粒离散元细观力学模拟研究[J].岩土力学, 2010, 31 (9): 2695~2703.

    Jia Xueming, Chai Hejun, Zheng Yingren. Mesomechanics research of large direct shear test on soil and rock aggregate mixture with particle flow code simulation. Rock and Soil Mechanics, 2010, 31 (9): 2695~2703.

    [17] Sadek M A,Chen Y,Liu J.Simulating shear behavior of a sandy soil under different soil conditions[J]. Journal of Terramechanics, 2011, 48 (6): 451~458.

    [18] 中华人民共和国水利部.SL237~1999土工试验规程[S].北京: 中国计划出版社, 1999.

    The Ministry of Water Resources of the People's Republic of China. SL237~1999 Specification of soil test. Beijing: China Planning Press, 1999.
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