Stability and Evolution of Planar and Concave Slopes under Unsaturated and Rainfall Conditions

Hassanikhah, Arash; Drumm, Eric C.

doi:10.1061/(asce)gm.1943-5622.0001662

Cited by 8 publications

(2 citation statements)

References 20 publications

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“…The second form is infiltrated rainwater, which leads to the gradual increase in slope soil water content from shallow to deep, in addition to the soil weight, and this generally weakens the mechanical properties. All these aspects are detrimental to the slope stability 55 . There are two infiltration directions, namely, the vertical and downhill directions.…”

Section: Discussionmentioning

confidence: 99%

Laboratory model test study of the hydrological effect on granite residual soil slopes considering different vegetation types

Chen

Lei

Zhang³

et al. 2021

Sci Rep

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The problems caused by the interaction between slopes and hydrologic environment in traffic civil engineering are very serious in the granite residual soil area of China, especially in Guangdong Province. Against the background of two heavy rainfall events occurring during a short period due to a typhoon making landfall twice or even two typhoons consecutively making landfall, laboratory model tests were carried out on the hydrological effects of the granite residual soil slope considering three vegetation types under artificial rainfall. The variation in slope surface runoff, soil moisture content and rain seepage over time was recorded during the tests. The results indicate that surface vegetation first effectively reduces the splash erosion impact of rainwater on slopes and then influences the slope hydrological effect through rainwater forms adjustment. (1) The exposed slope has weak resistance to two consecutive heavy rains, the degree of slope scouring and soil erosion damage will increase greatly during the second rainfall. (2) The multiple hindrances of the stem leaf of Zoysia japonica plays a leading role in regulating the hydrological effect of slope, the root system has little effect on the permeability and water storage capacity of slope soil, but improves the erosion resistance of it. (3) Both the stem leaf and root system of Nephrolepis cordifolia have important roles on the hydrological effect. The stem leaf can stabilize the infiltration of rainwater, and successfully inhibit the surface runoff under continuous secondary heavy rainfall. The root system significantly enhances the water storage capacity of the slope, and greatly increases the permeability of the slope soil in the second rainfall, which is totally different from that of the exposed and Zoysia japonica slopes. (4) Zoysia is a suitable vegetation species in terms of slope protection because of its comprehensive slope protection effect. Nephrolepis cordifolia should be cautiously planted as slope protection vegetation. Only on slopes with no stability issues should Nephrolepis cordifolia be considered to preserve soil and water.

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Section: Discussionmentioning

confidence: 99%

Laboratory model test study of the hydrological effect on granite residual soil slopes considering different vegetation types

Chen

Lei

Zhang³

et al. 2021

Sci Rep

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“…Hazard evaluation is a fundamental step in reducing the risk of geological disaster, which needs to consider the uncertainty characteristics of triggering factors, such as rainfall, reservoir water, and earthquake [30]. To calculate the rainfall conditions for different return periods, a rainfall probability distribution model has been established, which can be combined with the limit equilibrium analysis method for slope stability evaluation [31]. The evaluation process is to use the Slope module of Geo-studio software [32].…”

Section: Hazard Evaluation Methodsmentioning

confidence: 99%

Risk Assessment of Geological Disasters Based on Slope Units in Town Scale A case study of Dazhou Town along the Yangtze River

Fu,

Yang,

Shi

et al. 2024

Proceedings of the International Conference on Industrial Design and Environmental Engineering, IDEE 2023, November 24–26, 2023

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With the rapid urbanization, the geological disaster risk has attracted increasing attention in the safety risk of town construction. This paper proposes a six-step technical framework for geological disaster risk evaluation in town, i.e., slope unit division, rainfall condition analysis, automatic extraction of disaster-bearing bodies, hazard evaluation, quantitative evaluation of vulnerability, and risk evaluation. The migrant town along the Yangtze River, Dazhou Town in Wanzhou District of Chongqing, is selected as the study area. An improved hydrological analysis method for multi-scale division of slopes is proposed, which can be employed to extract the evaluation units for geological disaster risk. Based on the fifty-year rainfall conditions through the Gumbel distribution, the limit equilibrium method is adopted to estimate the stability and occurrence probability of slopes. Furthermore, the object-oriented approach is utilized to quickly extract information about buildings and traffic roads, etc. Finally, the hazard evaluation model and the vulnerability evaluation model are established to achieve the risk evaluation of geological disasters in towns, which are based on the slope unit and hazard source analysis, respectively. According to the risk map，34.5×10 3 m 2 of buildings and 15.0×10 3 m 2 of roads are in the extremely high risky zone, while about 36.3×10 3 m 2 of buildings and 38.3×10 3 m 2 of roads are in the high risky zone. It is found that the results of the risk evaluation are consistent with the field observations and surveys.

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Effects of concave facing profile on the internal stability of geosynthetic-reinforced soil walls

Ge,

Gao,

Zhang

2023

Acta Geotech.

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Stability and Evolution of Planar and Concave Slopes under Unsaturated and Rainfall Conditions

Cited by 8 publications

References 20 publications

Laboratory model test study of the hydrological effect on granite residual soil slopes considering different vegetation types

Laboratory model test study of the hydrological effect on granite residual soil slopes considering different vegetation types

Risk Assessment of Geological Disasters Based on Slope Units in Town Scale A case study of Dazhou Town along the Yangtze River

Effects of concave facing profile on the internal stability of geosynthetic-reinforced soil walls

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