Guoliang Lin, Sen Chen, Pengpeng Jiang, Mengchen Huang, Xiaoyi Zhang, Wanxi Jiang, Aoxiang Lin, Minyi Liu
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引用次数: 0
Abstract
Ecological slope protection offers a sustainable solution for mitigating rainfall-induced geotechnical failures. In this study, an ecological slope protection was constructed using an optimized ecological substrate composed of red soil, organic fertilizer, cement and wood chips in a 100: 20: 5: 15 ratio. SEM and EDS revealed that cement effectively anchors red soil, improving the stability of ecological substrate. To evaluate rainfall-induced performance, an artificial slope simulation (ASS) rainfall model with a cement-red soil ecological bag slope was developed, complemented by a small-scale finite element simulated slope (FESS) for cross-validation. The results demonstrated strong agreement between interlayer pressure measurements in the ASS and FESS numerical simulations, validating the high accuracy and feasibility of FESS. Based on the validated model, a full-scale ecological-bag slope protection FESS model was conducted on an actual slope to investigate the effects of rainfall intensity and slope gradient on stability. Under low rainfall intensity, slope gradient is the primary factor affecting the safety factor. However, increasing rainfall intensity reduces the safety factor through progressive matric suction loss. In the case study under the historical maximum rainfall intensity of 378 mm/12 h, the computed safety factor was 1.263, meeting the three-level slope safety requirements. Consequently, the optimized cement-red soil ecological substrate exhibits exceptional stability under extreme rainfall, providing a sustainable alternative to conventional slope protection systems and practical design guidelines for ecological slope engineering in rainfall-prone regions, contributing to enhanced geohazard mitigation.
期刊介绍：
Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces:
• the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations;
• the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change;
• the assessment of the mechanical and hydrological behaviour of soil and rock masses;
• the prediction of changes to the above properties with time;
• the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.
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