Evolution process and failure mechanism of a large expressway roadside landslide

Abstract

Site investigation, deformation monitoring, laboratory test, and theoretical calculations were used to analyze the evolution details of a large expressway roadside landslide during the start-up sliding process. The monitoring results show that the initial deformation and failure occurred on the protective wall at the slope toe, then gradually developed to the upper part of the slope, and finally led to tensile cracks at the slope trailing edge. Accelerated deformation of the slope support structures, such as the protective wall at the slope toe, the anti-slide pile, and the anchor cable, were observed during the continuous extreme rainfall. The infiltrated rainwater can change the weight, the osmotic pressure, the anti-sliding force, the sliding force of the sliding mass, and further soften the fully weathered tuff soil and reduce its strength, resulting in the landslide occurrence. Block the slope surface runoff is an effective measure to reduce the landslide risk. The current analysis will be helpful to the prevention, control, and emergency disposal of similar landslides.

Experimental investigation into the physical properties of mixed soil within sliding zones and landslide slip zone evolution process analysis

“…The landslide area studied in this paper is located on the border between Shenzhen and Huizhou in southern China (Zhang, Zhang, Ding and Zhu 2023). Its geographical location and some on-site conditions are shown in Fig.…”

“…In reference to the landslide site (Zhang, Zhang, Ding and Zhu 2023) discussed in the article, there exists a notable disparity in soil particle composition between CWTS and SC. Specifically, CWTS contains a higher proportion of fine particles, as indicated in Table 4.…”

“…Based on a typical engineering example of a highway roadside landslide (Zhang, Zhang, Ding and Zhu 2023), the formation process of slope slip zones were revealed in Fig. This study stems from on-site investigations, revealing a multi-component mixing phenomenon within the sliding zone soil.…”

“…However, due to the inherent complexity of the engineering geological environments in which landslides occur, current research has yet to comprehensively address the evolution patterns of physical properties in multi-component mixed sliding zones and their interplay with slope stability evolution. Drawing from firsthand observations during participation in a significant highway landslide control project (Zhang et al 2023), prominent multi-component mixing was identified within the slope's sliding zone, notably involving completely weathered tuff soil (CWTS) and silty clay (SC). Regrettably, research on CWTS-SC mixed sliding zone soil remains relatively scarce.…”

Field and Numerical Investigation of Taihu Resort Cut Slope Failure in Suzhou, China

“…These landslide disasters caused great loss of life and property. Many research investigations have discovered that failure on slopes is mainly caused by excavations [5][6][7][8][9], rainfall infiltration [10][11][12][13], or by human excavations accompanied by rainfall [14][15][16]. To avoid costly losses from sudden landslides, it is of great significance to conduct a comprehensive stability analysis of slopes under different scenarios.…”