This paper used a new type of ecological slope protection method-anchor reinforced vegetation system (ARVS) for shallow protection of the expansive soil slope. We established a test slope with different protection measures in the suburbs of Nanning; the artificial simulated rainfall tests and comprehensive in situ monitoring were carried out on the slope. The protective effect and mechanism of ARVS on expansive soil slopes under the action of rainfall were systematically studied. The results showed that the soil temperature in the ARVS area at a depth of 1.0 m was 1.77 ℃ lower than which in the bare area. ARVS showed superior soil and water conservation performance; when the rainfall intensity was 100 mm/h, the runoff and erosion in the ARVS area were reduced by 36.3% and 84.5% compared with the bare area, respectively. Under the protection of ARVS, the rangeability of soil volumetric water content was significantly reduced, effectively avoiding uneven cracking caused by water content gradients, and weakening the disadvantages of the violent drying-wetting cycle caused by rainfall-evaporation. Compared with the bare area, the vertical and horizontal deformations of the soil in the ARVS area decreased by 56.9% and 70.9% during the monitoring period, respectively. This paper aims to provide a new idea and method for ecological slope protection of expansive soil slopes.
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