本文關(guān)鍵詞：直立式加筋土擋墻在舊路拓寬工程中的應(yīng)用研究　出處：《湘潭大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 直立式 加筋土擋墻 路基加寬 土工格柵 有限元

【摘要】：加筋土擋墻以其良好的適用性、較好的經(jīng)濟(jì)性在工程中廣泛應(yīng)用。本文以國內(nèi)廣泛開展的公路拓寬工程為背景，采用L形面板直立式加筋土擋墻結(jié)構(gòu)，針對路基拓寬工程展開應(yīng)用研究。利用大型有限元商業(yè)軟件ABAQUS，對加筋新路基的施工過程進(jìn)行了模擬，并對影響加筋新路基強度與穩(wěn)定性問題的關(guān)鍵參數(shù)進(jìn)行了研究，分析了各參數(shù)對加筋新路基強度和變形特征的影響。主要研究內(nèi)容包括： 1.總結(jié)了國內(nèi)外對加筋土結(jié)構(gòu)應(yīng)用的研究成果和現(xiàn)狀，提出將直立式加筋土擋墻應(yīng)用于路基拓寬工程。 2.依據(jù)公路雙側(cè)對稱拓寬特征，建立了地基和新舊路基共同作用的三維有限元模型。其中，新路基采用L形面板直立式加筋土擋墻結(jié)構(gòu)。通過數(shù)值模擬，將計算結(jié)果與試驗結(jié)果進(jìn)行比較，驗證了本文所建模型的正確性和有效性。 3.針對新路基填筑施工中新舊路基和地基的變形及應(yīng)力分布特征，利用本文所建模型展開相關(guān)研究工作；通過分析新舊路基工后變形特征、土工格柵受力與變形特征及土工格柵加筋效應(yīng)，進(jìn)一步驗證了直立式加筋土擋墻應(yīng)用于路基拓寬工程的可行性與有效性。結(jié)果表明，直立式加筋土擋墻的應(yīng)用，，可使拓寬后的新路基變形較小，符合工程設(shè)計相關(guān)規(guī)范的要求。 4.針對影響加筋新路基強度和變形特征相關(guān)參數(shù)進(jìn)行了敏感性分析。通過分析可知加筋層數(shù)對新路基側(cè)向位移和沉降有較大影響，面板剛度和整體性對加筋新路基側(cè)向位移影響顯著，但對加筋新路基沉降影響較小，新舊路基結(jié)合部位的處理對新路基側(cè)向位移影響較小，但對新路基沉降影響較大，且若采用輕質(zhì)填料填筑新路基可顯著減小其側(cè)向位移和沉降。
[Abstract]:In this paper , the construction process of reinforced new subgrade is simulated and the key parameters affecting the strength and stability of reinforced new subgrade are studied in this paper . The main research contents include : 1 . Summarized the research achievements and present situation of the application of reinforced earth structure at home and abroad , and put forward the application of vertical reinforced concrete retaining wall to subgrade widening project . 2 . A three - dimensional finite element model for the common action of foundation and new subgrade is established according to the characteristics of double - side symmetric widening of highway . The new subgrade is composed of L - shaped panel vertical reinforced soil retaining wall structure . Through numerical simulation , the calculation results are compared with the test results , and the correctness and effectiveness of the proposed model are verified . 3 . According to the deformation and stress distribution characteristics of the new and old subgrade and foundation in the new subgrade filling construction , the relevant research work is carried out by using the model established in this paper . The feasibility and effectiveness of the vertical reinforced earth retaining wall in the subgrade widening project are further verified by analyzing the deformation characteristics of the new and old subgrade , the stress and deformation characteristics of the geogrids and the reinforcement effect of the geogrids . The results show that the application of the vertical reinforced concrete retaining wall can make the new subgrade deformed less and conform to the requirements of the relevant specifications of engineering design . 4 . Sensitivity analysis is carried out for the relative parameters affecting the strength and deformation characteristics of the new subgrade . Through analysis , the influence of reinforcement layer number on the lateral displacement and settlement of the new subgrade is obvious , but the influence of the rigidity and integrity of the panel on the lateral displacement of the new subgrade is small , but the influence of the treatment on the new subgrade settlement is small , but the settlement of the new subgrade is relatively large , and the lateral displacement and settlement of the new subgrade can be significantly reduced if the new subgrade is filled with the light filler .

【學(xué)位授予單位】：湘潭大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U416.1

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