摘要
本文讨论了一个基坑加固数值模型的发展，评估不同设计参数的开挖对基坑的显著影响。将数值模型的计算结果与已报道的砂土基坑加固工程实例进行了比较，结果表明两者吻合度较好。研制出的模型用于参数研究并展示不同设计参数的影响,如支撑刚度、壁厚、支撑布置与墙体埋深对支撑的力、墙产生的最大力矩、墙的最大侧向位移和距地面的最大竖直位移的影响。研究发现，在所有的组合中，在一定的埋深与开挖深度的比例下，采用特定类型的支撑布置，能产生最好的效果。在此数值研究基础上，提出了设计的指导准则。
土木工程师数据库主标题：加固；开挖；位移；参数；支撑；墙；弯曲；数值分析。
关键词：基坑加固；拉格朗日差分法；刚度；位移；埋深；设计参数；支撑力；墙厚；墙弯矩。
Abstract
This paper discusses the development of a numerical model for a braced excavation to estimate the various design parameters that significantly influence the excavationrsquo;s behavior. The results of the numerical model were compared with those of a reported case study of a braced excavation in sand, and close agreement between the results was observed. The developed model is used for parametric study to show the influence of different design parameters, such as strut stiffness, wall thickness, strut arrangement and the embedded depth of the wall on strut force, maximum moment developed in the wall, maximum lateral displacement of the wall, and maximum vertical displacement of ground surface. It was found that, among all the combinations studied, a particular type of strut arrangement for a particular ratio of embedded depth and excavation depth produces the best possible result. A design guideline is also presented based on the results of this numerical study. DOI: 10.1061/(ASCE)GM.1943-5622.0000207. copy; 2013 American Society of Civil Engineers.
CE Database subject headings: Bracing; Excavation; Displacement; Parameters; Struts; Walls; Bending; Numerical analysis.
Author keywords: Braced excavation; FLAC; Stiffness; Displacement; Embedded depth; Design parameters; Strut force; Wall thickness; Wall bending moment.
目录
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