Numerical Investigation of a Local Precise Reinforcement Method for Dynamic Stability of Rock Slope under Earthquakes Using Continuum–Discontinuum Element Method

Abstract

The slope reinforcement scheme has an important influence on the prevention and control of landslides. A reasonable reinforcement scheme can improve the reliability, economy and efficiency of landslide resistance. It is urgent to establish a local precise reinforcement method for landslides on the basis of clear process and the instability modes of landslides. Taking a high-steep anti-dip rock slope as an example, six numerical models are established by using the continuum–discontinuum element method (CDEM) to carry out seismic damage and dynamic analysis of slopes. By comparing the seismic response and damage characteristics of being unstrengthened, local precise reinforcement and overall reinforcement models, the applicability of the proposed local precise reinforcement method for the slopes is discussed. The results show that the determination of the dynamic amplifying effect and seismic damage characteristics of slopes is the primary prerequisite of the local precise reinforcement method. The dynamic amplification effect of the slope toe, crest and shallow slope surface are much larger, that is, they are the potential reinforcement areas. The local precision reinforcement times should be controlled within a certain number of times, and the slope after the first three times of the local reinforcement effect is the best. However, more than three times after the reinforcement effect it becomes worse. Moreover, the dynamic amplification effect, the equivalent crack ratio and the mechanical energy of the slope after three times of local precision reinforcement are similar to the overall reinforcement effect, which indicates that local precision reinforcement has good feasibility. This work can provide references for landslide disasters prevention and control.

Static and seismic stability investigation of a bamboo grid reinforced slope with different stepped reinforcing arrangements

“…In order to reconcile the complex earthquake time history with the unduly simplistic pseudo-static approach, Steedman and Zeng (1990) developed and implemented the pseudo-dynamic approach for seismic slope stability analysis (Eskandarinejad and Shafiee 2011, Qin and Chian 2018, Zhou and Qin 2020. Song et al (2023) examined a localized, precise reinforcement technique for enhancing the dynamic stability of rock slopes during earthquakes through the application of the Continuum-Discontinuum Element Method. The findings underscore the importance of determining the dynamic amplification effect and seismic damage characteristics of slopes as a crucial prerequisite for implementing the local precise reinforcement method.…”

Failure Mechanism of Anti-Dip Layered Soft Rock Slope under Rainfall and Excavation Conditions

“…Although the numerical simulation method is a repeatable and economical analysis method, the current research on anti-dip slope simulation is mainly based on finite element, finite difference, and traditional discrete element methods [31,[38][39][40]. Some scholars have also used new numerical methods, such as DDA, CDEM, and FDEM, which can effectively describe the fracture of rock or soil to conduct relevant research [41][42][43][44][45]. Liu et al [44] demonstrated the effectiveness of the FDEM method throughout the entire process simulation of anti-dip slope instability.…”

“…Liu et al [44] demonstrated the effectiveness of the FDEM method throughout the entire process simulation of anti-dip slope instability. Song et al [45] adopted the CDEM method to conduct seismic damage and dynamic analysis on a high, steep, anti-dip rock slope. However, the application of the new methods above in analyzing the instability process and mechanism of the anti-dip slope is still relatively weak.…”

Numerical Analysis of Interbedded Anti-Dip Rock Slopes Based on Discrete Element Modeling: A Case Study

“…Ren et al [21] investigated the dynamic effects and failure mechanism of anti-dip bedding rock slopes under seismic loading using three-dimensional DEM, and the amplification effect, changes in the Fourier spectrum, failure mechanism, and permanent displacement of the slope caused by the applied seismic action were analyzed. In addition to the traditional FEM and DEM mentioned above, some novel numerical simulation methods (e.g., DDA, CDEM, and FDEM) have also been applied to analyze the stability of different rock slopes [3,[29][30][31].…”