有限土压力计算方法研究OA

Classical earth pressure theories are based on the semi-infinite space assumption,struggling to adapt to the stress conditions of confined soil masses in engineering.Existing studies mostly focus on backfill-type confined soil,with insufficient attention to in-situ confined soil formed by structure penetration.To address this issue,this paper classifies confined soil into two typical working conditions(backfill and struc-ture penetration),establishes a theoretical calculation equation for confined earth pressure based on the hori-zontal layered element method,proposes a modified earth pressure coefficient K2,and verifies the equation's reliability through centrifuge tests.Parameter influence analysis shows significant differences in the evolution of confined earth pressure between the two conditions:the backfill condition is dominated by the soil arching effect,while the penetration condition is governed by stress redistribution.Adopting the at-rest earth pressure coefficient for the penetration condition leads to a deviation of over 35%,which requires correction using K2.This study establishes a dual-working-condition analysis system for confined earth pressure,enriches relevant calculation methods,and provides theoretical support for the design of engineering structures such as retaining walls and large-diameter piles.