Stability analysis of deep excavation trenches based on finite element method and angular displacement field
DONG Shujing
ZHAO Yulong
ZHAN Yuhua
WU Guohua
MA Wenlong
Abstract：To ensure the stability of deep excavations in road cuttings,the unconfined compressive strength,bulk density,apparent specific gravity,particle gradation,and crushing value of weathered rock soil are tested.Finite element software ABAQUS is used to simulate slope stability and analyze the factors influencing the deformation of deep excavations.Angular displacement sensors are deployed using the slicing method to monitor the deformation of the cuttings,and an angular displacement field is established based on the monitoring data.The results show that the instability and failure of the slope can be divided into three stages:initial deformation stage,uniform deformation stage,and near-sliding stage.A plastic strain zone appears at the foot of the slope in the second cross-section,with cracks emerging over time.The anti-sliding capacity of the foot of the slope gradually decreases,while the rock soil in the middle and lower parts moves downward,and the plastic zone at the foot of the slope slowly expands upward.After a period of movement,a plastic zone appears at the upper part of the slope,and the lower plastic zone rapidly spreads until it connects with the slope top,leading to instability failure.The slope top in the third cross-section is prone to cracking,and the trends and causes of angular displacement rate changes monitored by other sensors are basically consistent with those of the second cross-section.The deep red areas in the angular displacement field indicate the maximum angular displacement and the most significant deformation,and sensors should be placed in these locations for early warning.
Keywords：cuttingstabilityfinite element analysisangular displacement field
Publication Date：2025-03-30
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：8( 57-64 )