Stability of Red-Clay Slopes Subjected to Different Durations of Rainfall

2017 ◽  
pp. 533-540 ◽  
Author(s):  
Kaixi Xue ◽  
Binod Tiwari ◽  
Beena Ajmera ◽  
Yanxiang Hu
Keyword(s):  
Red Clay ◽  
Clay Slopes

scholarly journals Field Test Research on Red Clay Slope under Atmospheric Action

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Kaisheng Chen
Keyword(s):  
Internal Friction ◽  
Water Content ◽  
Pore Water ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Friction Angle ◽  
Internal Friction Angle ◽  
Red Clay ◽  
Failure Characteristics ◽  
Clay Slopes

By embedding water content sensors and pore water pressure sensors inside the red clay slope on-site in Guiyang, Guizhou, shear tests were performed on soil samples at different depths of the slope under different weather. The changes of water content, pore water pressure, and shear strength index of the slope inside the slope under the influence of the atmosphere were tracked and tested, and the failure characteristics and evolution of the red clay slope were analyzed. It is believed that the depth of influence of the atmosphere on red clay slopes is about 0.7 m, rainfall is the most direct climatic factor leading to the instability of red clay slopes, and the evaporation effect is an important prerequisite for the catastrophe of red clay slopes. The cohesion and internal friction angle of the slope soil have a good binary quadratic function relationship with the water content and density. The water content and density can be used to calculate the cohesion and internal friction angle. Failure characteristics of red clay slopes: the overall instability failure is less, mainly surface failure represented by gullies and weathering and spalling, and then gradually evolved into shallow instability failure represented by collapse and slump. The damage evolution law is as follows: splash corrosion and surface corrosion stage⟶ fracture development stage⟶ gully formation stage⟶ gully development through stage⟶ local collapse stage⟶ slope foot collapse stage.

scholarly journals Effect of long duration rainstorm on stability of Red-clay slopes

2016 ◽  
Vol 3 (1) ◽  
Author(s):  
Kaixi Xue ◽  
Beena Ajmera ◽  
Binod Tiwari ◽  
Yanxiang Hu
Keyword(s):  
Red Clay ◽  
Long Duration ◽  
Clay Slopes

scholarly journals Regional Stability Analysis of Red Clay Slope Based on Different Failure Modes: A Case Study in Taizaifu Area, Fukuoka

2019 ◽  
Vol 2019 ◽  
pp. 1-11
Author(s):  
Fang Wei
Keyword(s):  
Safety Factor ◽  
Failure Modes ◽  
Slip Surface ◽  
Borehole Data ◽  
Red Clay ◽  
Regional Stability ◽  
Infiltration Model ◽  
Slope Unit ◽  
The Difference ◽  
Clay Slopes

Red clay slopes have different failure modes in different geological and climatic contexts. Underlying weak layers are frequently witnessed in integral failures because of the reverse consolidation characteristics. On the contrary, heavy rainfall often causes superficial sliding for a considerable infiltration through developed microfractures. Based on the Geographic Information System, regional stability of red clay slopes was evaluated with two failure modes, such as “integral sliding” and “planar sliding.” First, terrain and borehole data of the study area were used to construct the digital elevation model. Second, slope units were partitioned as research objects. For integral sliding, the slip surface was supposed to lie above the strata interface, and it was regarded as a lower part of an ellipsoid. After calculating safety factors of potential slip surfaces that were randomly generated by the Monte Carlo method, the minimum safety factor of the slope unit and the critical slip surface could be determined. For shallow landslides triggered by rainfall infiltration, the one-dimensional infiltration model and infinite slope model were used. Moreover, the difference between the sliding direction of each column and the main aspect of entire slope unit was considered in safety factor calculation. Finally, regional slope stability characterized by the safety factor would be available; thus, it would be beneficial to sliding prevention and disaster treatment in this region.

Field Study on the Soil Water Characteristics of Shallow Layers on Red Clay Slopes and Its Application in Stability Analysis

2019 ◽  
Vol 44 (5) ◽  
pp. 5107-5116 ◽  
Author(s):  
Yonghui Chen ◽  
Bingyi Li ◽  
Yuntao Xu ◽  
Yunpeng Zhao ◽  
Jie Xu
Keyword(s):  
Stability Analysis ◽  
Field Study ◽  
Soil Water ◽  
Red Clay ◽  
Water Characteristics ◽  
Clay Slopes

Silvopastoral sheep and pine systems for small farmers in southern chile

1990 ◽  
Vol 1990 ◽  
pp. 159-159
Author(s):  
Herve M.P. ◽  
Balocchi O.A. ◽  
Penaloza R.
Keyword(s):  
Agroforestry Systems ◽  
Stocking Rate ◽  
Southern Chile ◽  
Red Clay ◽  
Erosion Damage ◽  
Marginal Soils ◽  
System 2 ◽  
Peasant Farmers ◽  
Clay Slopes ◽  
Potential Use

Chile's X region (40-43 degrees south), has around 1 million has. of marginal soils with forest-livestock potential use, red clay slopes being dominant, located in the coastal ranges. Subsistance agriculture with increasing erosion damage is carried out on small properties which also practice extensive livestock production with sheep and cattle.In order to study alternative land use which could benefit small peasant farmers agroforestry with sheep and pines was attempted.Two agroforestry systems using Pinus radiata D.Don and sheep were developed. System I started in 1977 planting 8 ha at 2,5 x 7m spacing. Romney ewes were introduced in 1979 initially at a stocking rate of 5/ha. Prunnings were carried out in 1980, 1984 and 1986; thinnings were done in 1982,1984 and 1986, to 7m and 200 st/ha respectively.System 2 used 20ha of conventional 2 x 2m forest planted in 1974. It was prunned and thinned in 1982,1984 and 1986 to Bm and 200 st /ha respectively and stocked initially with 4.7 Romney ewes/ha in 1983.

scholarly journals Erosion Control and Growth Promotion of W-OH Material on Red Clay Highway Slopes: A Case Study in South China

2021 ◽  
Vol 13 (3) ◽  
pp. 1144
Author(s):  
Xiao-chun Qin ◽  
An-chen Ni ◽  
Nan Zhang ◽  
Zheng-hao Chen
Keyword(s):  
Soil Erosion ◽  
Ecological Restoration ◽  
South China ◽  
Water Retention ◽  
Growth Promotion ◽  
Erosion Control ◽  
Solution Concentration ◽  
Retention Performance ◽  
Red Clay ◽  
Clay Slopes

Ecological restoration is difficult on the red clay highway slopes in the rainy areas in South China that experience severe soil erosion. By using the hydrophilic polyurethane material W-OH to solidify and protect red clay slopes, the erosion control will be substantially improved. We employed simulated rainfall erosion experiments and pot experiments to evaluate the anti-corrosion and growth promotion performances. We found that, (1) in the initial stage of protection, W-OH had the effect of accelerating slope drainage, solidifying the soil structure, and reducing soil loss, with the sediment reduction benefit reaching 37.4–65.3%. (2) The anti-erosion effect was mainly based on soil solidification. (3) The W-OH was affected by rainfall intensity and the W-OH concentration, and the soil erosion prediction equation was constructed according to the observation. (4) W-OH had a promising water retention performance and can promote the germination and late growth of slope plants to reduce the influence of eluviation. (5) The suitable W-OH solution concentration was 3–5% for slope protection herbs and shrubs, which were commonly used in South China. (6) The reduction in porosity was the fundamental cause of water retention improvement. The ecological restoration of slopes is a comprehensive process. Therefore, both anti-erosion performance and later plant growth are necessary. Our research provides a theoretical and experimental basis for applying the W-OH in the ecological restoration of the red clay slopes in subtropical areas and expanding the scope of the W-OH.

scholarly journals Probabilistic Analysis of Cut-Slope Stability for Tropical Red Clay of Depok, West Java as an Effect of Rainfall Duration and Intensity

2018 ◽  
Vol 147 ◽  
pp. 07004 ◽  
Author(s):  
Fathiyah Hakim Sagitaningrum ◽  
Widjojo Adi Prakoso ◽  
Erly Bahsan
Keyword(s):  
Slope Stability ◽  
Probabilistic Analysis ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Probability Of Failure ◽  
Red Clay ◽  
Run Off ◽  
Surface And Pore Water ◽  
Cut Slopes ◽  
Clay Slopes

Landslide in Indonesia, specifically in Java island, occurs during rainy seasons. In Java island, it is known that the tropical red clay has the ability to stand at steep angles, while in stability analysis due to rainfall, practitioners only consider the rise of groundwater table. Previous studies states that one of the factor affecting factor of safety (FS) for tropical red clay slopes is the formation of saturated zones due to matric suction. This research studies the effect of rainfall intensity and duration to FS of cut-slopes as parametric study with probabilistic analysis for different height of 10m, 20m, and 30m also slope angles of 27°, 45°, 55°, and 70°. Rainfall parameter are taken from FTUI rainfall station for advanced pattern and three-days duration of rain. Analysis of seepage uses SEEP/W and slope stability uses SLOPE/W. It is known that the significant increase of probability of failure due to the three-days rainfall is achieved at the 10m height and 70°-angled slope. Increase of the probability of failure is mainly due to rainfall infiltration which saturates the surface and pore water pressure increase until certain time where infiltration stops and turn into surface run-off.

Study on failure of red clay slopes with different gradients under dry and wet cycles

2020 ◽  
Vol 79 (9) ◽  
pp. 4609-4624 ◽  
Author(s):  
Liu Yang ◽  
Chen Kaisheng ◽  
Lyu Mengfei ◽  
Wang Yingchao
Keyword(s):  
Red Clay ◽  
Clay Slopes

Evaluation of Quality Characteristics of Brassica campetris L. Treated with Environmentally-Friendly Red Clay-Processed Materials

2015 ◽  
Vol 44 (5) ◽  
pp. 732-738 ◽  
Author(s):  
Yoojin Seo ◽  
Inyong Yang ◽  
Sungjin Yoon ◽  
SungGun Kim ◽  
Sooyoung Seo ◽  
...  
Keyword(s):  
Environmentally Friendly ◽  
Quality Characteristics ◽  
Red Clay
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