土木工程毕业设计翻译.docx

1、土木工程毕业设计翻译指导教师评定成绩(五级制)：指导教师签字：附件C：译文 Numerical Study of Effect of Encasement on Stone Column Performance护壁效应对“碎石桩性能”的数值分析Majid Khabbazian, Stud. M. ASCEGraduate Student and GSI Fellow, Dept. of Civil and Environmental Engineering, 301 DuPont Hall,University of Delaware, Newark, DE 19716. E-mail: ma

2、jidudel.edu纽瓦克，DE的19716，特拉华大学，301杜邦厅部，土木与环境工程系，研究生和GSI研究员Majid Khabbazian, Stud. M. ASCE。电子邮箱：majidudel.eduChristopher L. Meehan, A. M. ASCEAssistant Professor, Dept. of Civil and Environmental Engineering, 301 DuPont Hall, University ofDelaware, Newark, DE 19716. E-mail: cmeehanudel.edu纽瓦克，DE.的1971

3、6，美国特拉华州，大学部，301杜邦厅，土木及环境工程系，cmeehanudel.eduVictor N. Kaliakin, M. ASCEAssociate Professor, Dept. of Civil and Environmental Engineering, 301 DuPont Hall, University ofDelaware, Newark, DE 19716. E-mail: kaliakinudel.edu纽瓦克，DE的19716，美国特拉华州，大学部，301杜邦厅，土木及环境工程系，副教授。电子邮箱：kaliakinudel.eduABSTRACT摘要Encas

4、ing a stone column with a high-strength geosynthetic provides the columnmaterial with significant lateral confinement, which prevents lateral displacement ofthe column into potentially soft surrounding soil and consequently increases thebearing capacity of the column. Although this technique has bee

5、n successfullyapplied in practice, the load transfer mechanism of encased stone columns and theirperformance in comparison with conventional stone columns have not been studied indetail. This paper describes three-dimensional finite element analyses that werecarried out to simulate the behavior of a

6、 single stone column with and withoutencasement in a very soft clay soil using the computer program ABAQUS. A comprehensive study was performed to better understand the mechanism of load transfer in conventional stone columns and geosynthetic encased stone columns. The performance of partially encas

7、ed columns was then compared to that of fully encased columns and conventional stone columns. 用高强度土工合成材料包裹碎石柱，土工合成材料为碎石柱材料提供显著的横向约束，这样可以防止柱向着周围的软土地基发生侧向位移，从而增加柱子的承载能力。虽然这一技术已成功应用于实践中，受护壁作用的碎石桩的荷载传导机制和性能与传统的碎石桩相比，并没有被详细研究透。本文介绍在一个非常松软的粘土地基上使用ABAQUS软件的计算机程序模拟单个碎石桩，采用三位有限元分析法分析其有无包装效应。为了更深层次的了解传统的碎石桩和被

8、土工合成材料包裹的碎石桩中的荷载传导机制，我们展开了更加全面的研究。在研究中，用部分被土工合成材料包裹的碎石桩分别与完全被包裹的碎石桩和传统的碎石桩进行比较。INTRODUCTION说明Stone columns have been increasingly used for ground improvement, especially forstructures that can tolerate some settlement such as road embankments, storage tanks,low-rise buildings, lightly loaded foundat

9、ions, etc. This form of ground improvement is also commonly referred to as granular piles. Extensive use of stone columns is attributed to their proven successes in increasing bearing capacity, reducing total and differential settlements, increasing the time rate of settlement, and reducing the liqu

10、efaction potential of sands. 碎石桩已经被越来越多的用于地基的改善工程，特别是能承受一些沉降的结构，例如，公路路堤、存储仓库、低层建筑以及受到较轻荷载的基础等。这种地基的改良形式也通常被称为碎石桩。碎石柱的广泛使用，是因为它成功地证明了自身在提高承载能力，降低整体沉降和不均匀沉降，增加沉降的时间速率，减少砂土地基液化可能性方面的能力。Stone columns under compressive loads experience failure modes such as bulging(Hughes et al. 1975), general shear fail

11、ure (Madhav and Vitkar 1978), and sliding(Aboshi et al. 1979). However, in soft clays the most common failure mode for stone columns is bulging (Madhav and Miura 1994). 碎石桩在压力作用下，会产生一些破坏模式，如膨胀破坏模式 （Hughes等人。1975年），一般的剪切破坏（Madhav和Vitkar 1978年），滑移破坏（Aboshi 等人 1979）。然而，在软土地基中，碎石桩最常见的破坏模式是膨胀破坏（Madhav和Mi

12、ura1994年）。In very soft soils, due to the lack of required lateral confining pressure, the use ofstone columns can be problematic. In these situations, to provide the required lateral confining pressure and to increase the bearing capacity, stone columns are encased by a suitable geosynthetic. Using

13、a high-strength geosynthetic for confinement not only increases the strength of a stone column, but also prevents lateral displacement of the column into the very soft surrounding soil. Sharma et al. (2004) conducted tests to investigate the effect of geogrid reinforcement on bulging and load-carryi

14、ng capacity of a single stone column in soft clay. Murugesan and Rajagopal (2006, 2007) performed model tests and numerical analyses to study the behavior of a single geosynthetic-encased stone column with a limited zone of soil influence (a tributary approach to column group behavior). In the numer

15、ical analyses, Murugesan andRajagopal (2006) performed axisymmetric analyses and assumed continuum elementsfor the geosynthetic without considering the behavior of the interface betweendifferent materials (this paper addresses this phenomenon by using interface elementsin the numerical model). Lee e

16、t al. Lee et al. (2007) investigated the failure mechanism and load carrying capacity of individual geogrid encased stone columns by model tests. Alexiew et al. (2005) described the design principles, technologies, and procedures for geotextile encased stone columns and emphasized the importance of the tensile modulus of the geotextile that is used for column confinement. 在非常松软的软土地基上，由于所需的侧向围压不足，