Investigation on Deformation Mechanism and Treatment Effect of a Scattered Slope Based on Continuum–Discontinuum Element Method and Finite Difference Method

Abstract

Slope deformation and failure is an inevitable engineering problem in highway construction and operation in mountainous areas. Its essence is a continuous–discontinuous gradual failure process of slope under the action of unbalanced force. Slope deformation and failure mechanism is the basis and key content of its emergency treatment and comprehensive treatment. In this study, the continuous–discontinuous element method (CDEM) and finite difference method are used to analyze the deformation mechanism and support the effect of a scattered slope in the Biwei Expressway. The results showed that the change in the local geological environment caused by roadbed excavation leads to slope slippage along the surface and then pulls the upper rock mass gradually to produce slippage failure, resulting in the stability gradually decreasing. The mechanism is traction sliding–tensile cracking. The continuous–discontinuous element method can effectively simulate the formation process of the main and sub sliding planes during excavation and can better display the phenomenon of slope failure and gradual disintegration. The emergency disposal of the gravity anti-sliding retaining wall in front of the slope can effectively control further deformation and ensure temporary stability. In comprehensive treatment, step-type slope excavation, gravity anti-sliding retaining wall, and anchor frame beam are adopted to control the deformation and failure of slope and ensure long-term stability. The numerical simulation results are consistent with the actual results, which effectively explains the rationality of this study. The research results of this study can provide some reference for the emergency treatment and comprehensive treatment of slopes in mountainous areas and for the construction and operation of highways and other infrastructure in mountainous areas.

A new cube movement test for verification of simulations of contact processes of blocks of different size in geological hazards

“…13,14 The CDEM was successfully applied to the analysis of a variety of geotechnical engineering problems, such as coal caving mining, 15 propagation of hydrofracturing cracks, 16,17 rock blasting, 18,19 crack propagation of brittle materials, 20,21 deformation of tunnels, 22 and landslides. 23,24 The success of modern simulation models for granular matter requires realistic and efficient consideration of frequently complex particle shapes of geological materials, see Zhao et al 25 for a comprehensive appraisal of state-of-the-art computational models for granular particles of either naturally occurring shapes or engineered geometries.…”

“…It is a hybrid method that can simulate the whole process from a continuous to a discontinuous geological body 13,14 . The CDEM was successfully applied to the analysis of a variety of geotechnical engineering problems, such as coal caving mining, 15 propagation of hydrofracturing cracks, 16,17 rock blasting, 18,19 crack propagation of brittle materials, 20,21 deformation of tunnels, 22 and landslides 23,24 . The success of modern simulation models for granular matter requires realistic and efficient consideration of frequently complex particle shapes of geological materials, see Zhao et al 25 .…”

Study on the Stability of Cut Slopes Caused by Rural Housing Construction in Red Bed Areas: A Case Study of Wanyuan City, China

“…With the continuous development of urban and rural construction in red bed areas, slope cutting, which can increase the building area in some rural mountainous regions, is becoming more and more common. The high and steep cut slopes formed by artificial excavation are prone to geological disasters, such as landslides and collapses, that always lead to deaths and property damage [1][2][3]. Many scholars around the world have studied the stability of natural and excavated slopes and landslides.…”

Study on the threshold value of disaster-causing factors of engineering slope cutting in red-layer areas

“…Slope cutting excavation on slopes is becoming more common for acquiring a large floor area during construction, and high and steep artificial slope cutting has created safety hazards for landslides and geological disasters (Gao et al, 2022). The horizontal displacement of the cut slope is larger than the vertical displacement, deformation gradually increases with the gradation of the cut slope, and the deformation area of the slope is primarily concentrated near the cut slope surface, according to a study of the evolution of disaster-causing slope cutting on redlayer slopes (Shao et al, 2022).…”