摘要
砂砾石因其变形小、透水性强、价格低廉等特点,作为路基填筑材料比普通素土性能更好,可用于控制扩建路基的差异沉降。文章采用土工离心模型试验开展砂砾石加高软基路堤的变形特性研究,并通过与普通填土加高的对比试验进一步探讨加高软基路堤中砂砾石加高层的特性。试验结果表明,旧路堤沉降较小,新路堤沉降较大,新、旧路堤交界处会发生局部较大沉降。砂砾石由于密度较小且模量较高,减小了路堤加高层的沉降,特别是使加高层内的变形更加均匀。砂砾石层在相对较软的下覆非加高层和浅层软基中引起了应力扩散,减小了这些土层的不均匀变形。砂砾石层对软基变形的影响局限在一定深度,该影响深度约为非加高层高度的2/3。
The gravel can be used to control the settlement of the expanded subgrade as a better filling material than ordinary soil due to its large stiffness,high water permeability and low price.In this paper,the deformation characteristics of the embankment heightened with gravel on soft foundation were analyzed through centrifugal model tests.The effect of the gravel was further discussed through comparisons with the embankment heightened with soil.The results showed that the settlement of the old embankment was small while the settlement of the new embankment was relatively large.Large local settlement occurred near the boundary of the new embankment and the old.Because of the small density and high modulus of the gravel,the settlement within the heightening area reduced,especially the deformation became more uniform.Stress diffusion occurred within the non-heightening area and shallow soft foundation,and thus the uneven deformation within these areas decreased.The influence range of gravel on the deformation within soft foundation was limited and the influence depth was about 2/3 of the height of non-heightening area.
作者
邓敏维
陈天翼
廖镇华
牟太平
张嘎
Deng Minwei;Chen Tianyi;Liao Zhenhua;Mu Taiping;Zhang Ga(Guangdong Provincial Freeway Co.,Ltd.,Guangzhou 510623,China;State Key Laboratory of Hydroscience and Hydraulic Engineering,Tsinghua University,Beijing 100084,China)
出处
《土木工程学报》
EI
CSCD
北大核心
2023年第S02期115-121,共7页
China Civil Engineering Journal
基金
国家自然科学基金重点项目(52039005)
广东省省级科技计划项目(2021B1111610002)
