發(fā)布時(shí)間：2018-06-27 11:02

  本文選題：湖區(qū)公路 + 改擴(kuò)建路基��； 參考：《長(zhǎng)沙理工大學(xué)》2014年碩士論文

【摘要】：洞庭湖區(qū)是全國(guó)商品糧基地之一,湖區(qū)公路交通的發(fā)展有著非常重要的意義。隨著經(jīng)濟(jì)的發(fā)展,有很多公路已經(jīng)不能滿足當(dāng)?shù)亟煌康男枰?亟需進(jìn)行改擴(kuò)建。本文針對(duì)湖區(qū)公路改擴(kuò)建工程中的關(guān)鍵問題,結(jié)合南縣—茅草街公路改擴(kuò)建工程,采用數(shù)值模擬和室內(nèi)試驗(yàn)等方法,對(duì)湖區(qū)公路改擴(kuò)建工程路基變形特性及填料改良處治技術(shù)進(jìn)行了研究。主要研究?jī)?nèi)容如下：(1)選取代表性斷面,通過地質(zhì)勘查和室內(nèi)土工試驗(yàn),對(duì)新老路基下地基土性狀差異進(jìn)行了對(duì)比研究�？辈煸囼�(yàn)表明,新老路基下地基土的物理力學(xué)性質(zhì)有一定差異,特別是壓縮性指標(biāo)和強(qiáng)度指標(biāo)差異明顯。(2)對(duì)改擴(kuò)建工程路基變形特性進(jìn)行了有限元數(shù)值分析,研究了新路基填料彈性模量、密度對(duì)新老路基變形影響規(guī)律。提高新路基填料的彈性模量能有效降低新路基的豎向變形,新路基最大豎向位移隨著新路基填料密度的不斷增加而以近似正比例不斷增加。(3)通過對(duì)湖區(qū)填料素土及石灰改性土的擊實(shí)和CBR試驗(yàn)研究,得出了不同初始含水率對(duì)填料CBR的影響規(guī)律,為路基填料的施工提供濕度控制標(biāo)準(zhǔn)；研究了不同劑量石灰改性土的壓實(shí)特性和CBR特性,為施工控制參數(shù)(含水率、壓實(shí)度、摻灰量)的確定提供依據(jù)。(4)結(jié)合工程實(shí)際,對(duì)新老路基變形進(jìn)行觀測(cè)并與理論分析相驗(yàn)證,實(shí)際觀測(cè)結(jié)果與有限元分析結(jié)果一致。
[Abstract]:Dongting Lake District is one of the commodity grain bases in China. With the development of economy, many highways can not meet the needs of local traffic. In view of the key problems in the highway reconstruction and extension project in the Lake District, this paper combines the Nanxian-Maocaojie highway reconstruction and extension project, and adopts numerical simulation and indoor test methods. The deformation characteristics of embankment and the improved treatment technology of filler are studied in the highway reconstruction and extension project in Lake District. The main research contents are as follows: (1) the difference of soil properties under new and old subgrade is studied by means of geological exploration and laboratory geotechnical test. The investigation results show that the physical and mechanical properties of the new and old subgrade are different, especially the compressibility index and the strength index are obvious. (2) finite element numerical analysis is carried out on the deformation characteristics of the subgrade of the reconstruction and extension project. The influence of elastic modulus and density of new subgrade filler on deformation of new and old subgrade is studied. Increasing the elastic modulus of the new subgrade filler can effectively reduce the vertical deformation of the new subgrade. The maximum vertical displacement of the new subgrade increases in an approximate positive proportion with the increasing density of the new subgrade filler. (3) the compaction and CBR tests of the filler soil and the lime modified soil in the lake region are carried out. The influence of different initial moisture content on CBR is obtained, which provides a humidity control standard for subgrade filler construction, and the compaction characteristics and CBR characteristics of lime modified soil with different dosages are studied, which are the construction control parameters (moisture content, compaction degree, compaction degree). (4) combined with the engineering practice, the deformation of new and old roadbed is observed and verified by theoretical analysis. The actual observation results are consistent with the finite element analysis results.
【學(xué)位授予單位】：長(zhǎng)沙理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U416.1

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本文編號(hào)：2073704