A multi-objective optimization evaluation model for seismic performance of slopes reinforced by pile-anchor system

Area of Science:

• Geotechnical Engineering
• Earthquake Engineering
• Slope Stability Analysis

Background:

• Pile-anchor systems are crucial for seismic slope reinforcement.
• Failures of pile-anchor systems and slopes under seismic loads still occur.
• Existing evaluation models inadequately address pile-anchor system safety.

Purpose of the Study:

• To develop a multi-objective optimization evaluation (MOE) model for seismic performance assessment of pile-anchor reinforced slopes.
• To integrate slope stability, pile-anchor system safety, and dynamic response into a unified evaluation framework.
• To provide a comprehensive method for evaluating seismic reinforcement effects.

Main Methods:

• Proposed a multi-objective optimization evaluation (MOE) model.
• Incorporated negative indexes: slope displacement, acceleration amplification factor, pile displacement, and anchor displacement.
• Utilized intermediate indexes: anti-slide pile bending moment, shear force, and anchor axial force.
• Combined subjective and objective weights to determine comprehensive index weights.

Main Results:

• The MOE model comprehensively evaluates seismic performance.
• It considers critical factors like slope displacement, dynamic response, and structural forces within the pile-anchor system.
• The model provides a weighted assessment of seismic reinforcement effectiveness.

Conclusions:

• The developed MOE model offers a novel approach for evaluating slopes reinforced with pile-anchor systems.
• It addresses limitations of previous models by including the safety of the pile-anchor system itself.
• This model presents a valuable tool for future seismic reinforcement projects.