褥垫层设计参数对刚柔长短桩复合地基的特性影响研究

Study on Behavior of Rigid-flexible Long-short-pile Composite Foundation Under Different Cushion Design Parameters

本文对工程中常用的刚柔性长短桩复合地基在不同褥垫层设计参数下的工程特性进行分析,利用有限元方法分析了不同的褥垫层弹性模量、褥垫层厚度对刚柔性长短桩复合地基刚性桩、柔性桩的承载特性、桩土应力比、复合地基沉降等的影响。分析结果表明,刚性桩、柔性桩与土的应力比都随褥垫层弹性模量的增大而增大,随褥垫层厚度的增大而减小,沉降也随褥垫层弹性模量的增大而减小,随褥垫层厚度的增大而增大。根据分析,文中给出了褥垫层弹性模量和厚度的参考值,可为该类型复合地基的设计和应用提供参考。

In this paper, the engineering characteristics of composite foundation with rigid-flexible and long-short piles, which are commonly used in engineering, under different cushion design parameters are studied. By using the finite element method, the effects of cushion modulus, cushion thickness on the bearing characteristics of rigid and flexible pile, pile-soil stress ratio, and composite foundation settlement are discussed respectively. The analysis shows that, the rigid pile-soil stress ratio flexible pile-soil stress ratio increase with the increase of cushion elastic modulus, decrease with the increase of cushion thickness. Settlement of composite foundation decreases with the in- crease of cushion elastic modulus, and increase with the increase of cushion thickness. According to the analysis, reference values of elastic modulus and thickness of cushion are proposed in this paper. Some conclusions are pro- vided as references for future design and application of this kind of composite foundation.