Stability analysis of cohesive soil embankment slope based on discrete element method

Abstract

In order to study the safety factor and instability process of cohesive soil slope, the discrete element method(DEM) was applied. DEM software PFC2D was used to simulate the triaxial test to study the influence of the particle micro parameters on the macroscopic characteristics of cohesive soil and calibrate the micro parameters of DEM model on this basis. Embankment slope stability analysis was carried out by strength reduction and gravity increase method, it is shown that the safety factor obtained by strength reduction method is more conservative, and the arc-shaped feature of the sliding surface under the gravity increase method is more obvious. Throughout the progressive failure process, the failure trends, maximum displacements, and velocity changes obtained by the two methods were consistent. When slope was destroyed, the upper part was cracked, the middle part was sheared, and the lower part was destroyed by extrusion. The conclusions of this paper can be applied to the safety factor calculation of cohesive soil slopes and the analysis of the instability process.

Keywords

embankment slope / cohesive soil / stability analysis / numerical simulation / PFC2D software / safety factor

References

[1] LiuG-q, YangT, LiJ, JiaY-shun. Effects of aging on rheological properties of asphalt materials and asphalt-filler interaction ability [J]. Construction and Building Materials, 2018, 168: 501-511

[2] ChenA-q, LiuG-q, ZhaoY-l, LiJ. Research on the aging and rejuvenation mechanisms of asphalt using atomic force microscopy [J]. Construction and Building Materials, 2018, 167(APR10): 177-184

[3] XiaW-y, DuY-j, LiF-s, LiC-p, YanX-l, ArulrajahA, WangF, SongD-jun. In-situ solidification/stabilization of heavy metals contaminated site soil using a dry jet mixing method and new hydroxyapatite based binder [J]. Journal of Hazardous Materials, 2019, 369: 353-361

[4] AlejanoL R, FerreroA M, RamírezoyangurenP, FernándezM Á. Comparison of limit-equilibrium, numerical and physical models of wall slope stability [J]. International Journal of Rock Mechanics and Mining Sciences, 2011, 48(1): 16-26

[5] AlexakisH, MakrisN. Limit equilibrium analysis of masonry arches [J]. Archive of Applied Mechanics, 2015, 85(910): 1363-1381

[6] MichalowskiR L. Stability assessment of slopes with cracks using limit analysis [J]. Canadian Geotechnical Journal, 2013, 50(10): 1011-1021

[7] ChenJ, ZhangD, HuangX-mingApplication of discrete element particle flow software (PFC) in road engineering [M], 2015, Beijing, China Communications Press Co., Ltd.(in Chinese)

[8] MaT, ZhangD-y, ZhangY, WangS-q, HuangX-ming. Simulation of wheel tracking test for asphalt mixture using discrete element modelling [J]. Road Materials and Pavement Design, 2018, 19(2): 367-384

[9] ZhouJ, JiaM-caiGeotechnical meso-model test and numerical simulation [M], 2008, Beijing, China Science Publishing & Media Ltd.(in Chinese)

[10] MaT, WangH, ZhangD-y, ZhangY. Heterogeneity effect of mechanical property on creep behavior of asphalt mixture based on micromechanical modeling and virtual creep test [J]. Mechanics of Materials, 2017, 104: 49-59

[11] TangF-l, MaT, ZhangJ-h, GuanY-s, ChenL-feng. Integrating three-dimensional road design and pavement structure analysis based on BIM [J]. Automation in Construction, 2020, 113(5): 103152

[12] ZhangY, MaT, LingM, ZhangD-y, HuangX-ming. Predicting dynamic shear modulus of asphalt mastics using discretized-element simulation and reinforcement mechanisms [J]. Journal of Materials in Civil Engineering, 2019, 31804019163

[13] WaltonO. Particle-dynamics calculations of shear flow [J]. Studies in Applied Mechanics, 1982, 71327-338

[14] MaT, WangH, HeL, ZhaoY-l, HuangX-m, ChenJ. Property characterization of asphalt and mixtures modified by different crumb rubbers [J]. Journal of Materials in Civil Engineering, 2017, 29(7): 04017036-1–10

[15] IwashitaK, OdaM. Micro-deformation mechanism of shear banding process based on modified distinct element method [J]. Powder Technology, 2000, 2(1): 192-205

[16] ZhangY, MaT, DingX-h, HuangX-m, XuG-ji. Impacts of air-void structures on the rutting tests of asphalt concrete based on discretized emulation [J]. Construction and Building Materials, 2018, 166: 334-344

[17] ShiD-d, XueJ-f, ZhaoZ-y, ShiJ-yu. A DEM investigation on simple shear behavior of dense granular assemblies [J]. Journal of Central South University, 2015, 22(12): 4844-4855

[18] JiangN-j, DuY-j, LiuK. Durability of lightweight alkali-activated ground granulated blast furnace slag (GGBS) stabilized clayey soils subjected to sulfate attack [J]. Applied Clay Science, 2018, 161: 70-75

[19] ZhangQ, XuW-y, LiuQ-y, WangW, MengQ-xiang. A novel non-overlapping approach to accurately represent 2D arbitrary particles for DEM modelling [J]. Journal of Central South University, 2017, 24(1): 190-202

[20] DingX-h, MaT, GuL-h, ZhangD-y, HuangX-ming. Discrete element methods for characterizing the elastic behavior of the granular particles [J]. Journal of Testing and Evaluation, 2020, 48: 20190178

[21] TangF-l, ZhuS-c, XuG-j, MaT, KongL-d, KongL-yun. Influence by chemical constitution of aggregates on demulsification speed of emulsified asphalt based on UV-spectral analysis [J]. Construction and Building Matierals, 2019, 212102-108

[22] DingX-h, MaT, HuangX-ming. Discrete-element contour-filling modeling method for micromechanical and macromechanical analysis of aggregate skeleton of asphalt mixture [J]. Journal of Transportation Engineering, Part B: Pavements, 2019, 145(1): 04018056

[23] CaoR-h, LinH, CaoP. Strength and failure characteristics of brittle jointed rock-like specimens under uniaxial compression: Digital speckle technology and a particle mechanics approach [J]. International Journal of Mining Science and Technology, 2018, 284669-677

[24] CundallP, StrackO. Discussion: A discrete numerical model for granular assemblies [J]. Géotechnique, 1980, 30(3): 331-336

[25] WangC, TannantD, LillyP. Numerical analysis of the stability of heavily jointed rock slopes using PFC2D [J]. International Journal of Rock Mechanics & Mining Sciences, 2003, 40(3): 415-424

[26] ZhouJ, WangJ-q, ZengY, JiaM-cai. Slope safety factor by methods of particle flow code strength reduction and gravity increase [J]. Rock and Soil Mechanics, 2009, 30(6): 1549-1554

[27] HeC-meiMechanical behavior of muddy soft rock and dynamic stability of soft-hard interbedded slopes in reservoir area under cyclic loading [D], 2018, Chongqing, Chongqing University(in Chinese)

[28] FengX-b, SongD-q, XuY-fu. Simulation research on characteristics of embankment slope under rainfall scour [J]. Chinese Journal of Underground Space and Engineering, 2018, 14(2): 558-564(in Chinese)

[29] JinL, ZengY-w, ChengT, LiJ-jing. Stability analysis of soil-rock mixture slope based on 3-D DEM [J]. Journal of Harbin Institute of Technology, 2020, 52(2): 41-50(in Chinese)

[30] BanerjeeA, PuppalaA J, HoyosL R. Suction-controlled multistage triaxial testing on clayey silty soil [J]. Engineering Geology, 2019, 265: 105409

[31] SaiedM, YvesB, AbdelhamidB, UlrichM, BrianE. Creep deformation in vaca muerta shale from nanoindentation to triaxial experiments [J]. Journal of Geophysical Research: Solid Earth, 2019, 124(8): 7842-7868

[32] XuJ-b, ChenJ-p, JiangP-j, ChengH-jin. Investigation of creep behaviors of wudang mica schist by triaxial compression tests [J]. Geotechnical and Geological Engineering, 2019, 37(5): 3831-3842

[33] MartinelliD, TodaroC, LucianiA, PeilaD. Use of a large triaxial cell for testing conditioned soil for EPBS tunnelling [J]. Tunnelling and Underground Space Technology, 2019, 94103126

[34] BolE, ÖnalpA, ÖzocakA, SertS. Estimation of the undrained shear strength of Adapazari fine grained soils by cone penetration test [J]. Engineering Geology, 2019, 261105277

[35] LiuJ-k, CuiY-h, LiuX, ChangD. Dynamic characteristics of warm frozen soil under direct shear test-comparison with dynamic triaxial test [J]. Soil Dynamics and Earthquake Engineering, 2020, 133106114

[36] HE Zhong-ming, XIANG Da, LIU Ya-xin. Triaxial creep test and particle flow simulation of coarse-grained soil embankment filler [J]. Frontiers in Earth Science, 2020: 8. DOI: https://doi.org/10.3389/feart.2020.00062.

[37] XiaW-y, FengY-s, DuY-j, ReddyK R, WeiM-li. Stabilization and solidification of a heavy metal contaminated site soil using a hydroxyapatite based binder [J]. Construction and Building Materials, 2017, 156199-207

[38] ChenT, LuanY-c, MaT, ZhuJ-q, HuangX-m, MaS-jia. Mechanical and microstructural characteristics of different interfaces in cold recycled mixture containing cement and asphalt emulsion [J]. Journal of Cleaner Production, 2020, 258: 120674

[39] KocaT K, KocaM Y. Comparative analyses of finite element and limit-equilibrium methods for heavily fractured rock slopes [J]. Journal of Earth System Science, 2020, 12965-76

[40] DingX-h, ChenL-c, MaT, MaH-x, GuL-h, ChenT, MaY. Laboratory investigation of the recycled asphalt concrete with stable crumb rubber asphalt binder [J]. Construction and Building Materials, 2019, 203: 552-557

[41] WuH-l, JinF, BoY-lin. Leaching and microstructural properties of lead contaminated kaolin stabilized by GGBS-MgO in semi-dynamic leaching tests [J]. Construction and Building Materials, 2018, 172: 626-634

[42] TangF-l, MaT, GuanY-s, ZhangZ-xin. Parametric modeling and structure verification of asphalt pavement based on BIM-ABAQUS [J]. Faculty of Engineering, 2020, 111: 103066

[43] MaH, CaiJ-m, LinZ, QianS-z, LiV. CaCO₃ whisker modified engineered cementitious composite with local ingredients [J]. Construction and Building Materials, 2017, 1511-8