Abstract
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.
Highlights
Introduction e red clay inChina is mainly distributed in the south, such as Guangxi, Guizhou, Yunnan, Guangdong, and Hunan provinces
In order to understand the hydrological process of expansive soil slopes, Lei et al [21] (2020) conducted a simulated rainfall experiment to study the influence of slope and initial soil water content on runoff and infiltration of expansive soil slopes in the south
Rainwater can penetrate into the slope in rainy days, resulting in an increase in the water content of the slope. e foot of the slope is covered with turf, and rainwater cannot penetrate the ground, so the water content of the foot of the slope is minimal
Summary
Buried KM30B01 soil moisture sensor and KYJ-32 at the top of slope, slope surface, and slope toe depths of 100 mm, 200 mm, 300 mm, 400 mm, 500 mm, 700 mm, 900 mm, 1100 mm, 1300 mm, and 1500 mm. ere are 30 sets of vibrating wire pore water pressure sensors each (Figure 2), which monitor the changes in water content and pore water pressure respectively, use rain gauges to monitor atmospheric rainfall, and shear soil samples at different depths of the slope in different weather test, analyzing the change law of the shear strength index of the soil sample. e monitoring period is from July 22, 2018, to November 10, 2018.
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