Research on The Interaction Mechanism and Stability Analysis of Unsaturated Soil Slope and Support Structure
DOI:
https://doi.org/10.13052/ejcm2642-2085.3342Keywords:
Retaining walls, Pseudo dynamic method, Unsaturated soil mechanics, Overturning stabilityAbstract
Unsaturated soil, as a widely existing soil in nature, has significant differences in mechanical properties compared to saturated soil. Especially when considering water migration and changes, its stability issues become more complex. Therefore, in-depth research on the interaction mechanism and stability of unsaturated soil slopes and support structures is significant. This study first analyzes the mechanical properties of unsaturated soil and the influence of water migration on soil strength based on the principles of unsaturated soil mechanics. It establishes a mechanical model for unsaturated soil slopes. Subsequently, the pseudo-dynamic method was used to simulate the response of slopes under dynamic loads such as earthquakes and rainfall, and the deformation and failure modes of unsaturated soil slopes were explored. Regarding support structures, this article studies the interaction mechanism between retaining walls, anchor rods, and unsaturated soil slopes. A mechanical model of the interaction between the support structure and unsaturated soil slopes was established by analyzing the influence of the support structure on the distribution of soil pressure on the slope, as well as the stability and bearing capacity of the support structure itself. In terms of stability analysis, this article uses numerical analysis methods such as the limit equilibrium and finite element methods to evaluate the overall stability of unsaturated soil slopes and support structures. Suggestions for optimizing the design of support structures were proposed by comparing the stability performance of slopes under different support schemes. The experiment shows that increasing soil cohesion by 1kPa per unit area can increase the stability coefficient by about 5%. The interface friction angle between the fill and the wall back increases by 1 degree, resulting in an increase of approximately 7% in the overturning stability coefficient.
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References
Zuo, X., Liu, D., and Xu, Z. (2023). Characteristic Analysis of the Response Mechanics of Asymmetric High-rise Buildings Subjected to Transverse Wind Loads Considering Second-order Vibration Patterns. European Journal of Computational Mechanics, 32(04), 313–340.
Halder, K., and Chakraborty, D. (2023). Estimation of seismic active earth pressure on reinforced retaining wall using lower bound limit analysis and modified pseudo-dynamic method. Geotextiles and geomembranes.
Srikar, G., and Mittal, S. (2022). Seismic active pressure on an included retaining wall with surcharge on a submerged backfill. Journal of earthquake and tsunami.
Wang, G., and Wang, L. (2023). Research on the lamb problem in semi-infinite space of non-uniform unsaturated soil. Mechanics of Solids, 58(4), 1271–1287.
Gupta, A., Khati, B. S., and Sawant, V. A. (2021). Seismic Active Earth Pressure behind the Included Retaining Wall for Included c-Soil Backfill Using Pseudo-Dynamic Approach. 16SEE-2018.
Nimbalkar, S., Pain, A., and Annapareddy, V.S.R. (2020). A strain dependent approach for seismic stability assessment of rigid retaining wall. Geotechnical and Geological Engineering (6).
Munwar, B. B… (2022). The influence of strain localization and phase on the expression of earth pressures by pseudo-dynamic method the influence of strain localization and phase on the expression of earth pressures by pseudo-dynamic method.
Tao, G., Li, Y., Liu, L., Zhong, C., Xiao, H., and Luo, C. (2022). A testing method for measurement of permeability coefficiency and soil-water character curve of unsaturated soil based on the axis translation technology. Journal of Hydrological Engineering (7), 27.
Wang, L., Gao, Y., Wang, L., Zhang, J., and Chen, B. (2023). Fluence of soil suction and seismic exception on active earth pressure. KSCE journal of civil engineering.
Song, H., Huang, J., Zhang, Z., Jiang, Q., Liu, L., He, C., and Zhou, Y. (2024). Analysis of Water Migration and Spoil Slope Stability under the Coupled Effects of Rainfall and Root Reinforcement Based on the Unsaturated Soil Theory. Forests, 15(4), 640.
Que, Y., Long, C. C., and Chen, F. Q. (2023). Seismic active earth pressure of infinite width backfilled oil on cantilever retaining wall with Long relief shelf under translational mode. KSCE journal of civil engineering (8), 27.
Qin, C., and Chian, S. C. (2020). Pseudo-dynamic lateral earth pressures on rigid walls with varying cohesive-fractional backfill. Computers and Geotechnologies, 119, 103, 289.
Prashant, S., and Patil, K. A. (2023). Evaluating the signification of nature in shallow landslide failure: saturated-unsaturated soil perspective. Multiscale and multidisciplinary modeling, experts and design (4), 6.
Duan, G., Song, F., Wang, H., Rodriguez-Dono, A., Wang, L., and Chen, J. (2024). Stability analysis of unsaturated loess slopes subjected to extreme rainfall incorporating creep effects. Computers and Geotechnics, 169, 106231.
Ri, N.H., Ri, Y.S., Kim, Y.A., Ma, Z., and Liu, Y. (2020). Stability analysis and size optimization of retaining walls on unsaturated soil. Soil Mechanics and Foundation Engineering, 57(17).
Chen, Q., Yang, X. G., and Zhou, J. W. (2024). Assessing the mechanical effects of vegetation on the stability of slopes with different geometries and soil types. Bulletin of Engineering Geology and the Environment, 83(1), 8.
Guo, L., Li, T., Chen, G., Yu, P., and Yang, D. (2019). A method for microscopic unsaturated soil-water interaction analysis based on dda. Computers and Geotechnologies, 108, 143–151.
Yu, H., Xu, Z., Liu, T., and Yuan, F. (2020). A novel prediction method of dynamic wall pressure for silos based on support vector machine. Advances in Civil Engineering.
Abbas, N., Khan, I., Afayou, A., Khan, A., and Alam, N. (2024). Enhanced Geotechnical Methods for Evaluating Slope Stability in Unconsolidated Strata: A Comprehensive Analysis. Journal of Mining and Environment.
Zhifang, M., Zhuoyu, S., and Yuan, Y. (2023). Static Mechanics and Dynamic Analysis and Control of Bridge Structures Under Multi-Load Coupling Effects. European Journal of Computational Mechanics, 32(04), 369–392.
Xu, P., Hatami, K., and Jiang, G. (2020). Seismic rotational stability analysis of reinforced soil retaining walls. Computers and Geotechnologies, 118, 103,297.
Singh, P., Bhartiya, P., Chakraborty, T., and Basu, D. (2023). Numerical investigation and estimation of active earth thrust on gravity retaining walls under seismic excitation. Soil Dynamics and Earthquake Engineering, 167, 107798.
Rouzkhosh, A., Zadkarim, S., and Pourbaba, M. (2023). Application of the material point method in the modeling of arching effects behind retaining walls with active movements. Numerical Methods in Civil Engineering, 8(2), 80–91.
Fathipour, H., Tajani, S. B., Payan, M., Chenari, R. J., and Senetakis, K. (2023). Impact of transient infiltration on the ultimate bearing capacity of obliquely and eccentrically loaded strip footings on partially saturated soils. International Journal of Geomechanics, 23(2), 04022290.
Qu, H. L., Deng, Y. Y., Gao, Y. N., Huang, X., and Zhang, Z. (2022). Time history of seismic earth pressure response from gravity retaining wall based on energy dissipation. Journal of Mountain Science, 19(2), 578–590.
Li, X., and Liu, J. (2021). Seismic Rotational Stability Analysis of Gravity Retaining Wall under Heavy Rainfall. KSCE Journal of Civil Engineering, 25, 4575–4584.
Abdul-Hussain, N. (2021). The Geotechnical Response of Retaining Walls to Surface Explosion (Doctoral dissertation, Université d’Ottawa/University of Ottawa).
Shwan, B. J. (2024). Drought-induced stability reduction in unsaturated geotechnical applications. Modeling Earth Systems and Environment, 1–11.
Fathipour, H., Tajani, S. B., Payan, M., Chenari, R. J., and Senetakis, K. (2023). Impact of transient infiltration on the ultimate bearing capacity of obliquely and eccentrically loaded strip footings on partially saturated soils. International Journal of Geomechanics, 23(2), 04022290.
Sivakumar Babu, G. L. (2024). Reliability and Risk Analysis in Geotechnical and Geoenvironmental Engineering. Indian Geotechnical Journal, 1–33.
