To explore the stability of highway slope anchor bolts combined with plant root slope protection, based on the ecological slope protection project of a highway in Dalian. Based on the strength reduction method, the finite difference software is used to compare and analyze the horizontal deformation, soil settlement, slip surface position, and safety factor of the slope under the conditions of no support, ecological slope protection (early), and ecological slope protection. According to the calculation results of slope deformation and safety factors under different conditions, the stability of the highway slope is evaluated. The results show that the maximum deformation of the slope occurs in the middle of the slope surface, which should be supported by centralized support. After the support, the maximum deformation of the slope moves to the toe of the slope; The safety factor of the slope increases with the increase of the cohesion and internal friction angle of the rock-soil mass of the slope. The cohesion has a greater influence on the slope stability when the slope angle is larger, and the internal friction angle is opposite; The safety factor increases linearly with the increase of bolt length, and the slope stability will not continue to improve when the length of the bolt exceeds the effective anchorage length. At this time, the slip surface will move to the slope and reduce the stability of the slope.

Linlin Liu, Haitao Wang, Yu Zhang, Yang Wang. Stability evaluation of slope protection by anchor combined with plant roots. Academic Journal of Engineering and Technology Science (2024) Vol. 7, Issue 2: 101-112. https://doi.org/10.25236/AJETS.2024.070216.

[1] Peng, N.B. Study on Seismic Responses and Anchoring Mechanism of Anchored Rock Slope. PhD diss[J]. Lanzhou University. 2014, (in Chinese)

[2] Liu, T., Shi, W. and Sui, M.H. Orthogonal numerical simulation of high and precipitous rock mass slope stability on eco-technology of anchor-geomat spraying[J]. Qingdao Technological University. 2015, 36(05):18-22.  (in Chinese)

[3] Liu, M.H. and Tao, Y.J. Application of ecological slope protection in urban river protection project[J]. Water conservancy in Jiangsu. 2008, (05) 42-44. https://doi.org/10.16310/j.cnki.jssl.2008.05.012 (in Chinese)

[4] Elena Benedetta Masi et al. Effects of roots cohesion on regional distributed slope stability modelling [J]. Catena. 2021, 222. https://doi.org/10.1016/j.catena.2022.106853

[5] Sheng, X.J and Lu G.H. Numerical Simulation of Geotechnical Prestressed Anchor Support Based on FLAC3D Computer Simulation[J]. Computer simulations, 2021,38(02):206-209+295. (in Chinese)

[6] Tang, D.Q. Stability analysis of slope strengthened by plant roots in Zhenjiang area. Master's thesis [J]. Jiangsu University of Science and Technology. 2018

[7] Hong, W., Liu, D.G., and Lin, Z.X. Slope stability analysis based on 3D strength reduction method[J]. Geotechnical Investigation & Surveying. 2019,(47) 09, 18-23. (in Chinese)

[8] Yang, H.N, Li, J.L, Gao, L.W, Li, W.C, Zhao, Y.N, and Ji, X.D. Economic Evaluation of Ecological Protection Technology of Highway Slopes Based on Quantitative Analysis of Ecological Benefits[J]. Soil and water conservation in China. 2020,3(456)66-68. https://doi.org/10.14123/j.cnki.swcc.2020.0072. (in Chinese)

[9] Wei, P.R, Zhang Z.Y, and Meng X.H. Line position optimization method for mountain roads based on slope stability and earthwork balance[J]. Journal of The Chinese Institution of Engineers. 2023, 46(6,) 661-673 https://doi.org/10.1080/02533839.2023.2227871

[10] Abduraimov, U., & Jo`rayevQ. About the methods for calculation of the stability of slopes of ground massives [J]. Central asian journal of mathematical theory and computer science, 2023, 4(1), 83-88. https://doi.org/10.17605/OSF.IO/SDQCM

[11] Han, W.D., Gu, M.Y., Yang, X.Y., Qiao, Y.W., and Wang, X.G. Slope stability based on FLAC3D numerical simulation[J]. Journal of Liaoning Technical University (Natural Science), 2013, 32 (09)1204-1208.  (in Chinese)

[12] Dawson E M, Roth W H, and Drescher A.  Slope stability analysis by strength reduction[J]. Geotechnique, 1999, 49(6)835-840.https://doi.org/10.1680/geot.1999.49.6.835

[13] Lian, Z.Y., Han, G.C., and Kong, X.J. Stability analysis of excavation by strength reduction FEM[J]. Chinese Journal of Geotechnical Engineering. 2001, (04)407-411. (in Chinese)

[14] Deng, J.H., Zhang, J.X., Min, H., and Mei, S.H. 3D stability analysis of landslides based on strength reduction(Ⅱ): evaluation of reinforcing factor of safety[J]. Rock and soil Mechanics, 2004, (06) 871-875. https://doi.org/10.16285/j.rsm.2004.06.007 (in Chinese)

[15] Hong, W.Y, Truong-Nhat-Phuong Pham, and Weng, Z.Z. Experimental study of the effect of different backfilled soils on the stability of mechanically stabilized earth walls[J]. Journal of The Chinese Institution of Engineers. 2019, 43(2) 111-124 https://doi.org/10.1080/02533839.2019.1694445

[16] Sun, S.W., Lin, H., and Ren, L.W.. “Application of FLAC3D in Geotechnical Engineering” [M]. Beijing: China Water & Power Press. China. 2011, (in Chinese) 

[17] Wang, T., Han, X., and Su, K.. “FLAC3D Numerical Simulation Method and Engineering Application” [M]. Beijing: China Architecture & Building Press. China. 2019, (in Chinese) 

[18] Wu, W.P., Liao, Z.H., Wang, J.Q., Ding, X.J., and Zhang, L.J., et al. JTG D30-2004. Code for Design of Highway Roadbed [M]. Chinese: China Communications Publishing. China. 2004, (in Chinese)