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Reliability-Based Analysis and Global Optimization Design of Anchor Anti-Slide Pile

A reliability-based approach for the analysis and optimization design of anchor anti-slide pile is presented in this study by using the project cost as its objective function. The following four failure modes: tensile failure or pull-out failure of the anchor rod, as well as shear failure of anti-slide pile in the anchoring section or loading segment, are considered. The cohesion force, internal friction angle of surrounding soils, and axial compressive strength of concrete are viewed as random variables for finding optimal design parameters, such as the cross-section area or width of anchor anti-slide pile. By employing the optimization toolbox of Matlab, the corresponding design procedures are established and utilized into a practical engineering project (i.e. a slope marked as K6+525~K6+610 in Shui-Dong road, Guiyang). Results show that the proposed approach is effective and the project cost is reduced 14.89% when the reliability-based optimization design is used.