摘要
根据土钉支护、基坑开挖的受力特点、土钉及其与土体粘结的工作性能,建立三维计算模型,用有限元方法模拟基坑开挖与支护的施工过程、土钉拉力作用和土钉与周围土体粘结滑移的工作性能。在土的本构模型中,以应用Duncan提出的非线性EB模型为基础,参照LadeDuncan破坏准则提出一种加荷或卸荷(再加荷)判别准则,并考虑固结压力降低后弹性模量的确定方法。把这些原理应用于一个工程实例的计算分析,计算结果与实测结果有相同的变化趋势,数值大小基本吻合,验证了有限元模型和分析方法的可靠性。
On the basis of characteristic of soil nailing construction,mechanical properties of deep excavation as well as the behaviours of nails and their adhension slip interaction with soil,a three dimensional finite element model was erected in which the construction procedure of excavationg shotcreting and soil nailing was simulated,and the nails and their adhension slip interation with soil was also incorporated A nonlinear E B model proposed by Duncan etc ,associated with some inprovements such as a new criterion for distinguishing between loading and unlaoding reloading and a mothod for dertimining moduli after consolidation pressures decreasing,was selected as a soil constitutive law The analysis of an engineering case shows that the agreement between the measured and the predicted results is so good that the reliability of the method is proved
出处
《工业建筑》
CSCD
北大核心
1999年第9期7-11,15,共6页
Industrial Construction
关键词
土钉支护
有限元
非线性分析
本构模型
深基坑
soil nailing finite element method non linear analysis constitutive model
