本文選題：既有線重力式擋土墻　切入點：安全評估　出處：《天津大學(xué)》2014年碩士論文

【摘要】：重力式擋土墻由于具有結(jié)構(gòu)簡單、施工方法簡便以及依靠墻身自重承受土壓力等有點,廣泛應(yīng)用于公路和鐵路的邊坡支護中。但是隨著重力式擋土墻投入運營時間的增長,在外力和內(nèi)力作用下,呈現(xiàn)出諸多病害,安全狀況發(fā)生較大的變化。因此,有必要對既有線重力式擋土墻展開安全評估,明確擋土墻的安全狀況,使擋土墻加固改造決策科學(xué)化,維修、養(yǎng)護費用最小化,運營事故最小化。根據(jù)國內(nèi)外既有線擋土墻安全評估研究現(xiàn)狀和工程實際,本文在總結(jié)前人研究成果的基礎(chǔ)上,針對既有線重力式擋土墻安全評估體系進行了研究,研究的主要成果如下:在充分分析現(xiàn)有安全評估方法局限的基礎(chǔ)上,提出了包括總體評估和細部評估兩個方面的既有線重力式擋土墻安全評估體系,總體評估采用定性化的方法對擋土墻的整體安全狀態(tài)做出評估,細部評估應(yīng)用定量化的方法對擋土墻各細部安全狀態(tài)做出評估。針對既有線重力式擋土墻總體評估采用了層次模糊綜合評估法,該方法將層次分析法與模糊理論相結(jié)合,首先利用層次分析法(AHP)的思想構(gòu)造出一個層次分明的、每一層包含有若干組同級評估指標(biāo)既有線擋土墻安全評估指標(biāo)體系,然后利用多級模糊評估模型對擋土墻的安全狀態(tài)做出等級評估。針對既有線重力式擋土墻細部評估采用了安全系數(shù)評估法,該方法在全面分析擋土墻設(shè)計以及破壞形式的基礎(chǔ)上,將擋土墻細部安全評估劃分為穩(wěn)定性安全評估、抗基礎(chǔ)不均勻沉降破壞安全評估、抗墻身破壞安全評估、抗沿軟弱層滑動破壞安全評估五個方面。結(jié)合工程實例闡述了本文提出的既有線重力式擋土墻安全評估體系的應(yīng)用,同時用MyEclipse 8.6開發(fā)工具,Oracle 10g數(shù)據(jù)庫,tomcat 7.0服務(wù)器開發(fā)了一套既有線擋土墻安全評估系統(tǒng)。
[Abstract]:Gravity retaining wall is widely used in slope support of highway and railway because of its simple structure, simple construction method and bearing earth pressure by self-weight of the wall body, but with the increase of operation time of gravity retaining wall, Under the action of external force and internal force, there are many diseases, and the safety situation has changed greatly. Therefore, it is necessary to carry out safety assessment of gravity retaining wall of existing railway line, to make clear the safety condition of retaining wall. This paper makes the decision of reinforcement and reconstruction of retaining wall scientific, maintenance, maintenance cost minimized, operation accident minimized. According to the present situation of safety evaluation and engineering practice of existing railway retaining wall at home and abroad, this paper summarizes the previous research results. The safety assessment system of gravity retaining wall on existing railway is studied. The main results are as follows: based on the analysis of the limitations of existing safety assessment methods, A safety assessment system for gravity retaining wall of existing railway is proposed, which includes overall assessment and detailed evaluation. The overall assessment adopts qualitative method to evaluate the overall safety status of retaining wall. In detail assessment, the quantitative method is used to evaluate the safety state of every detail of retaining wall. The hierarchical fuzzy comprehensive evaluation method is used for the overall evaluation of gravity retaining wall on existing railway lines, which combines AHP with fuzzy theory. Firstly, using the idea of Analytic hierarchy process (AHP), a hierarchy is constructed, each layer contains several groups of the same level evaluation index, the existing railway retaining wall safety evaluation index system. Then the multi-stage fuzzy evaluation model is used to evaluate the safety status of retaining wall. The safety factor evaluation method is used to evaluate the gravity retaining wall in detail. Based on the comprehensive analysis of the design and failure form of retaining wall, the detailed safety assessment of retaining wall is divided into stability safety assessment, anti-foundation uneven settlement damage safety assessment, anti-wall damage safety assessment. In this paper, the application of the gravity retaining wall safety assessment system proposed in this paper is described in the light of engineering examples. At the same time, a set of existing railway retaining wall security evaluation system is developed by using MyEclipse 8.6 development tool, Oracle 10g database and tomcat 7.0 server.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU476.4

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