本文選題：局部軟弱地基　切入點：加筋路堤　出處：《有色金屬(礦山部分)》2016年06期

【摘要】：局部軟弱地基上加筋路堤技術(shù)具有施工便捷、造價降低、路基承載力提高、路堤不均勻沉降減少等優(yōu)點,但其作用機(jī)理和變形特性相當(dāng)復(fù)雜,國內(nèi)尚無相關(guān)規(guī)范可循。通過拉格朗日描述位移的大變形有限元分析法對局部軟弱地基上加筋路堤的作用機(jī)理及變形特性進(jìn)行了研究,側(cè)重分析了該類路堤頂部和底部最大差異沉降、路堤中心軸處分荷比等變化規(guī)律。結(jié)果表明,局部軟弱地基上加筋路堤通過土拱效應(yīng)和拉膜效應(yīng)的耦合作用分擔(dān)了部分荷載,從而有效減小了作用在軟弱地基上的荷載;路堤填土層間土拱效應(yīng)受填土高度和軟弱區(qū)寬度影響較大,軟土壓縮系數(shù)、加筋體抗拉剛度、軟弱區(qū)深度對土拱效應(yīng)影響甚微;局部軟弱土與加筋體存在"互補(bǔ)作用",但現(xiàn)有的設(shè)計方法常忽略此點,偏于保守。
[Abstract]:The technology of reinforced embankment on local soft foundation has the advantages of convenient construction, lower cost, higher bearing capacity of roadbed and less uneven settlement of embankment, but its working mechanism and deformation characteristics are quite complex, and there are no relevant codes to follow in our country.The mechanism and deformation characteristics of reinforced embankment on local soft foundation are studied by means of the finite element method of large deformation which describes the displacement of Lagrange, and the maximum differential settlement between the top and bottom of this kind of embankment is analyzed emphatically.Variation law of charge ratio of central axis of embankment.The results show that the reinforced embankment on the local soft foundation takes part of the load through the coupling of the soil arch effect and the film pulling effect, thus effectively reducing the load acting on the soft foundation.The soil arch effect between embankments is affected greatly by the height of fill and the width of soft zone. The compression coefficient of soft soil, the tensile stiffness of reinforced body and the depth of soft zone have little effect on the effect of soil arch.There is a "complementary action" between the local weak soil and the reinforced body, but the existing design methods often ignore this point and tend to be conservative.
【作者單位】： 福州大學(xué)土木工程學(xué)院;
【基金】：國家自然科學(xué)基金資助(41572253) 高等學(xué)校博士學(xué)科點專項科研基金博導(dǎo)類資助課題(20133514110004)
【分類號】：U416.12
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本文編號：1708208