摘要
在实际基坑工程设计与计算中,数值分析已经成为最重要的手段。在计算过程中,如何选择合适的土体本构模型以及计算参数对结果有较大的影响。本文在分析了常用的本构模型基础特点上,通过具体算例系统地比较了各类本构模型在基坑工程中的适用性。通过比较同一基坑的侧壁水平位移、坑外地表沉降以及坑底土体隆起,可以对比几个常用本构模型线弹性、摩尔库伦模型、修正剑桥模型的模型差异与特点。具体工程实例的分析,表明了能反映土体应变硬化特征、能区分加荷卸荷区别的修正剑桥模型在基坑工程数值分析中可以较合理的模拟基坑工程开挖工况,因而建议在相关的计算分析中尽量采用修正剑桥本构模型。
In current excavation project design and calculation, the numerical analysis has been be- came the most essential method. And it is known that the selection of soil＇ s constitutive model and relat- ed parameters are affecting the calculation result to a great extent. This article describes several generally applied soil constitutive models and compare their difference through practical model calculation. Certain numerical simulation results including surrounding soil settlement, support pile＇ s lateral displacement and excavation bottom soil＇ s bump are analyzed and applicability of commonly used models such as E- lastic model,MC model and MCL model have been discussed. It is observed that MCL model can simu- late the excavation practical situation better compared with other introduced models because MCL model can describe soil＇s strain hardening characteristic and also distinguish unloading modulus from loading.
出处
《低温建筑技术》
2015年第8期102-105,共4页
Low Temperature Architecture Technology
基金
深圳市科技研发资金(CXZZ201208291548220942)
关键词
基坑工程
本构模型
数值分析
应变硬化
变形
沉降
excavation engineering
constitutive model
numerical analysis
strain hardening
de-formation
settlement
