基于三维扫描技术的土石混合体离散元模型参数反演及直剪模拟

doi:10.11896/cldb.20010144

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Abstract Based on three-dimensional scanning technology, the databases with the real rock blocks shape of different particle sizes and discrete element models of soil-rock mixture (S-RM) samples with different stone contents were established. Mechanical sensitivity between the macro-meso parameters was analyzed and the linear equations were built according to the principle of orthogonal test design, calibrating meso-para-meters for the discrete element model by mechanic tests data. The large-scale numerical shear tests of the stone contents' S-RM samples under different normal stresses were conducted. The results show that: the shear stress increases gradually and the volume deformation first contraction and then dilatancy during the shear process. It is noteworthy that with the increase of normal stresses, the peak strength and shear contraction deformation all increase, but the initial modulus changes slightly. The S-RM has no obvious peak strength under low contents of stone, and then the phenomenon of strain hardening is significant and shearing is the mainly deformation. The initial modulus and shear strength increases with the increase of stone content. For S-RM with high contents of stone, the peak stress occurs and then shows strain softening and prominent shear dila-tancy deformation in the late shear. The strength of force chain and initial coordination number of S-RM increases with the increase of either the stone contents or the normal stress. The increase of normal stress increase the overall level of coordination number. In shearing process, for S-RM with low contents of stone, the coordination number increase gradually with the increase of shear displacement, while the trend decreases for the stone contents of S-RM with high decreases. The fluctuation of coordination number and sample volume tends to be stable when reach to the critical value. As the stone content increases continually, the shear zone of the S-RM sample becomes wider, the gradient of velocity and displacement around the shear plane increases. A counter-clockwise vortex velocity field appears in the samples during the mid-to-late shear. The coordination number of dynamic shear box large compared to that of static shear box, and the coordination number in the shear zone fluctuates the most. In the S-RM, the weak force chain is scattered and sparse, while the strong force chain is concentrated. During the shear process, the strength of force chain increases first and then decreases. With the diverges and thickens of force chain, eventually the locally force chain are connected to each other diagonally.

Key words： soil-rock mixture 3D scanning technology large direct shear test macroscopic deformation law meso-structural features

Published: 04 June 2021

CLC number:

TU43

Fund:Natural Science Foundation of Xinjiang (2019D01B16).

About author:: Shuyong Wang, doctoral students, mainly engaged in the study of multiscale catastrophe mechanism of complex geotechnical media and its numerical simulation.
Lingkai Zhang, doctor, mainly engaged in the study of static and dynamic characteristics and constitutive model of coarse-grained soil.

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	WANG Shuyong
	ZHANG Lingkai
	CHEN Guoxin
	YUAN Jun

Cite this article:

WANG Shuyong,ZHANG Lingkai,CHEN Guoxin, et al. Parameter Inversion and Direct Shear Simulation of Discrete Element Model of Soil-Rock Mixture Based on 3D Scanning Technology[J]. Materials Reports, 2021, 35(10): 10088-10095.

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http://www.mater-rep.com/EN/10.11896/cldb.20010144 OR http://www.mater-rep.com/EN/Y2021/V35/I10/10088

1 Li X, Liao Q L, He J M. International Journal of Rock Mechanics and Mining Sciences, 2004, 41(3), 16.
2 Li S H, Li X, Liu X Y. Chinese Journal of Rock Mechanics and Enginee-ring, 2006, 25(6), 1125 (in Chinese).
李世海, 李晓, 刘晓宇. 岩石力学与工程学报, 2006, 25(6), 1125.
3 You X H. Chinese Journal of Rock Mechanics and Engineering, 2002, 21(11), 1748 (in Chinese).
油新华. 岩石力学与工程学报, 2002, 21(11), 1748.
4 Meng X Y,Li S H,Zhang J F. Chinese Journal of Rock Mechanics and Engineering, 2004, 23(10), 1760 (in Chinese).
孟祥跃, 李世海, 张均锋. 岩石力学与工程学报, 2004, 23(10), 1760.
5 Nakao T, Fityus S. Geotechnical Testing Journal, 2008, 31(5), 393.
6 Bagherzadeh K A, Mirghasemi A A. Particuology, 2009, 7(1), 83.
7 Savely J P. International Journal of Mining and Geological Engineering, 1990, 8(3), 203.
8 Xue Y D, Liu Z Q, Huang H W. Architectural and Environmental Engineering, 2012, 34(6), 75 (in Chinese).
薛亚东, 刘忠强, 黄宏伟. 土木建筑与环境工程, 2012, 34(6), 75.
9 Liu W P, Shi W M, Kong W X, et al. Rock and Soil Mechanics, 2005, 26(11), 166 (in Chinese).
刘文平, 时卫民, 孔位学, 等. 岩土力学, 2005, 26(11), 166.
10 Liu X R, Tu Y L, Wang P, et al. Chinese Journal of Geotechnical Engineering, 2017, 39(8), 1425 (in Chinese).
刘新荣, 涂义亮, 王鹏, 等. 岩土工程学报, 2017, 39(8), 1425.
11 Cundall P A. In: Proceedings of the Symposium of the International Society for Rock Mechanics. Rotterdam, 1971, pp. 129.
12 Strack O D L, Cundall P A. The distinct element method as a tool for research in granular media, Part Ⅰ. University of Minnesota, USA, 1978.
13 Cundall P A, Strack O D L. The distinct element method as a tool for research in granular media, Part Ⅱ. University of Minnesota, USA, 1979.
14 Cundall P A, Strack O D L. Geotechnique, 1979, 29(1), 47.
15 Graziani A, Rossini C, Rotonda T. International Journal of Geomecha-nics, 2012, 12(6), 648.
16 Skinner A E, Mice B S. Geotechnique, 1969, 19(1),150.
17 Xu W J, Yue Z Q, Hu R L. International Journal of Rock Mechanics and Mining Sciences, 2008, 45(5), 749.
18 Kong L, Peng R. Chinese Journal of Rock Mechanics and Engineering, 2011, 30(10), 2112 (in Chinese).
孔亮, 彭仁. 岩石力学与工程学报, 2011, 30(10), 2112.
19 Liu X N, Shi C. Science Technology and Engineering, 2014, 14(36), 108 (in Chinese).
刘兴宁, 石崇. 科学技术与工程, 2014, 14(36), 108.
20 Medley E W. The engineering characterization of mélanges and similar block-in-matrix rocks(bimrocks). Ph. D. Thesis, University of California at Berkeley, USA, 1994.
21 Potyondy D O, Cundall P A. International Journal of Rock Mechanics and Mining Sciences, 2004, 41(8),1329.
22 Cong Y, Wang Z Q, Zheng Y R, et al. Chinese Journal of Geotechnical Engineering, 2015, 37(6),1031 (in Chinese).
丛宇, 王在泉, 郑颖人, 等. 岩土工程学报, 2015, 37(6), 1031.
23 Nohut S, Cevik A. International Journal for Multiscale Computational Engineering, 2014, 12(1), 1.
24 Deng R, Lin J Z, Yang H Z.Journal of Chongqing Technology and Business University(Natural Science Edition),2019,36(4),17(in Chinese).
邓瑞,林金朝,杨宏志.重庆工商大学学报(自然科学版),2019,36(4),17.