摘要
真空预压工程中塑料排水板等竖井通水量随地基深度和固结时间而变化,即变井阻效应已经证明是实际存在的。另一方面,在真空预压工程三维有限元分析中,由于竖井和涂抹区在有限元模型中的划分使得三维有限元模拟较为困难。为真实模拟真空预压工程实际情况,在有限元分析中引入变井阻数学模型,并给出变井阻无量纲参数A_1、α_2。另外,为降低三维有限元建模难度,选用合适的网格单元简化竖井区,并用等效方法简化涂抹区,实现了考虑涂抹、变井阻效应的三维有限元分析。以天津港某围海造陆工程为例,建立三维有限元模型进行分析计算,对比分析计算值与实测数据,验证了程序的合理性,为以后软基加固工程三维有限元模拟提供了一种有效方法。
The inconstant well resistance effect, namely the changing discharge capacity of PVD with the foundation depth and consolidation time, is observed in drainage well under the vacuum preloading condition. Meanwhile, the partition of vertical drain zone and smear zone in 3D model is another challenging problem of finite element simulation. In order to simulate the actual conditions of vacuum preloading, a model with dimensionless parameters A1 and α2 considering well resistance in 3D finite element analysis is developed in this paper. An adaptive grid unit simplifies the drain zone and an equivalent method simplifies smear zone in simulation. The proposed procedure is applied to build the 3D finite element model of the reclamation project in Tianjin Port, and is verified by comparisons between the calculated data and the observed data.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2017年第5期1517-1523,共7页
Rock and Soil Mechanics
关键词
变井阻效应
涂抹效应
真空预压
三维有限元
inconstant well resistance effect
smearing effect
vacuum preloading
3D finite element
