Abstract
In order to get the law of rainwater infiltration and the law of progressive water damage, the slope of Tianshang bridge foundation in Yunnan Province of China is taken as the engineering basis. The site investigation of the damaged slope is carried out. The traditional Green-Ampt model is improved by considering the ponding effect of dynamic water flow on the slope surface. Based on the variation characteristics of wetting front obtained by the improved infiltration model, the progressive failure process of slope with continuous infiltration is simulated by FLAC3D software. The results show that the water damage of Tianshang bridge slope is mainly caused by the slope absorbing a lot of rainwater in a short time, which has obvious time discontinuity characteristics in time, and shows obvious multi-layer progressive failure characteristics in failure space. The wetting front characteristics obtained by the improved Green-Ampt infiltration model are more consistent with the engineering practice. The water accumulation effect of surface water gradually weakens with the increase of the wet front depth. The slope failure develops gradually from the toe to the top and from shallow to deep. The intermittent failure characteristics provide surplus time for the engineering treatment, the gravel soil slope should be treated after a small-scale water damage occurs.
Highlights
Continuous heavy rainfall is the main cause of slope damage, especially when a large amount of rain is absorbed in a short period of time (Alfonso Gutiérrez-Martín et al 2019; Damiano E et al 2017)
Liang et al (2020) analyzed the influence of rainfall intensity, slope angle and vegetation coverage on slope erosion characteristics, and the research showed that rainfall intensity had the most significant influence, followed by vegetation coverage, and slope angle had the least influence
This paper takes the Tianshang bridge of Zhaotong Qiaojia second-class highway in Yunnan Province of China as the engineering object, fully considers the ponding effect caused by the collection of the flowing water on the slope surface, improves the GreenAmpt infiltration model, and analyzes the progressive failure of the foundation slope of Tianshang bridge by water based on the improved model and FLAC3D numerical simulation software
Summary
Continuous heavy rainfall is the main cause of slope damage, especially when a large amount of rain is absorbed in a short period of time (Alfonso Gutiérrez-Martín et al 2019; Damiano E et al 2017). Chen et al (2020) proposed a domino model to analyze the stability of slope based on the characteristics of slope asymptotic failure. The rich research results of the above scholars provide a scientific basis for understanding the infiltration law and failure process of rainwater, and can guide the in-depth study of slope water damage. In the research results of considering the ponding in the slope, considering the same thickness of ponding in the slope Both treatment methods will cause the same depth of rainwater infiltration from the top to the toe of the slope. This paper takes the Tianshang bridge of Zhaotong Qiaojia second-class highway in Yunnan Province of China as the engineering object, fully considers the ponding effect caused by the collection of the flowing water on the slope surface, improves the GreenAmpt infiltration model, and analyzes the progressive failure of the foundation slope of Tianshang bridge by water based on the improved model and FLAC3D numerical simulation software
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