Abstract
This study presents a stability analysis of a high-steep rock slope with two faults during excavations and evaluates the effectiveness of a proposed reinforcement method using prestressed anchor cables. A 3D finite difference model was established based on the strength reduction method using FLAC3D software. The influence of various fault conditions and the effectiveness of the reinforcement on the slope stability during the excavation process were analyzed and compared to field monitoring data. The numerical analysis and field monitoring results showed that the fault close to the slope surface (f20) was prone to the local instability under external forces caused by the excavation, but a fault further away from the slope surface (f14) had insignificant influence on the stability of the slope. Based on the numerical analysis results, the proposed reinforcement measure can increase the factor of safety (FOS) of the slope by 19.2%. The field monitoring data also showed that the displacement of the monitoring point gradually decreased after the reinforcement, and the deformation of the slope was effectively controlled.
Highlights
Faults or weak intercalations can adversely affect the stability of rock slopes during the construction process and make the stability analysis become more complicated [1,2,3]. e slope stability analysis was originally developed based on the analysis of lateral soil pressure and foundation bearing capacity in soil mechanics
A 3D finite difference model was Advances in Civil Engineering established based on the strength reduction method using FLAC3D software. e movement of the rock slope was monitored during the excavation process and compared to the numerical analysis results
Because the anchor cable was installed after the Stage 3 completed, the factor of safety (FOS) of the Stages 1 and 2 was the same. e FOS of the Stages 3, 4, and 5 was improved after the reinforcement installed. e FOS of the slope after the excavation Stage 6 increased by 19.2% with the reinforcement treatment, which indicates that installing the anchorage measure is an e cient way to improve the stability of the rock slope during the excavation process
Summary
Faults or weak intercalations can adversely affect the stability of rock slopes during the construction process and make the stability analysis become more complicated [1,2,3]. e slope stability analysis was originally developed based on the analysis of lateral soil pressure and foundation bearing capacity in soil mechanics. E slope stability analysis was originally developed based on the analysis of lateral soil pressure and foundation bearing capacity in soil mechanics. Since the 1970s, with the rapid development of the computer technology, various numerical analysis methods including finite element, finite difference, and discrete element methods have been proposed and applied to slope stability analyses [12,13,14], which significantly improved the speed and accuracy of a slope stability analysis. Is case study focuses on evaluating how the excavation process can influence the stability of a high-steep rock slope with faults and the effectiveness of the proposed reinforcement method. A 3D finite difference model was Advances in Civil Engineering established based on the strength reduction method using FLAC3D software. e movement of the rock slope was monitored during the excavation process and compared to the numerical analysis results
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