本文關(guān)鍵詞：高填方土質(zhì)路基穩(wěn)定性分析與填筑技術(shù)研究　出處：《中南大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 高填方路基 邊坡穩(wěn)定性 路基變形 填筑方法與技術(shù)

【摘要】：高填方土質(zhì)路基易產(chǎn)生邊坡失穩(wěn)和路基沉降現(xiàn)象,對強度和穩(wěn)定性的要求較高,在工程實踐中需引起重視。一方面,為防止高填方邊坡失穩(wěn),在工程建設(shè)中需對邊坡穩(wěn)定性進行計算；另一方面,為保證施工過程中高填方路基變形符合規(guī)范要求,需要預(yù)測填筑過程中路基的變形情況。此外,路基的穩(wěn)定性受路基填筑技術(shù)影響,因此掌握高填方土質(zhì)路基填筑工程的施工技術(shù)理論和方法是非常重要的。 本文以高填方土質(zhì)路基的穩(wěn)定性為研究對象,采用極限平衡法,對不同工況下高填方路基的邊坡穩(wěn)定性進行計算分析,來探討邊坡級數(shù)、坡率、平臺寬度等因素對邊坡穩(wěn)定性的影響；同時采用有限差分法,對不同工況下高填方路堤的路基變形進行計算與分析,以揭示邊坡級數(shù)、坡率、填筑厚度等因素對路基變形的影響。此外,結(jié)合含水率和壓實度的概念,開展施工工藝研究。本文主要工作和結(jié)論如下： (1)由于高填方路基的邊坡高度較高,所以必須驗算其邊坡穩(wěn)定性,本文采用發(fā)展較為成熟的極限平衡法對邊坡穩(wěn)定性進行分析,使用極限平衡法中最常用的瑞典圓弧法、簡化Bishop法和Janbu法對邊坡安全系數(shù)進行探討和研究；同時,高填方路基的填筑高度較大,會導(dǎo)致路基下的地基土發(fā)生較大沉降,在填筑過程中必須先通過計算對路基的變形進行預(yù)測,本文基于有限差分法基本原理對路基變形進行分析和研究。 (2)以極限平衡法為理論基礎(chǔ),使用數(shù)值模擬軟件對不同工況下高填方路堤的邊坡穩(wěn)定性進行計算與分析,來研究不同計算方法、不同邊坡級數(shù)、不同坡率、不同平臺寬度等因素對邊坡穩(wěn)定性的影響。 (3)以有限差分法為理論基礎(chǔ),通過數(shù)值模擬軟件對不同工況下高填方路堤的路基變形進行計算與分析,以研究不同邊坡級數(shù)、不同坡率、不同填筑厚度等因素對路基變形的影響。 (4)路基的強度和穩(wěn)定性受路基填筑方法及其填筑技術(shù)影響極大。路基的填筑施工在公路交通建設(shè)當(dāng)中相當(dāng)重要,路基填筑工程的施工方法和施工質(zhì)量直接影響相應(yīng)工程的質(zhì)量和成本,因此掌握高填方土質(zhì)路基填筑工程的施工技術(shù)理論和方法是非常重要的。本文以湖南某高速公路路基工程為依托工程,基于施工控制含水率和壓實度的控制方法為主要研究對象,結(jié)合路基施工工藝及填筑施工流程、碾壓機械的選擇以及含水率和壓實度的快速檢測方法來論述路基填筑方法及其技術(shù)研究。
[Abstract]:High fill soil subgrade is easy to produce slope instability and subgrade settlement phenomenon, the demand for strength and stability is high, need to be paid attention to in engineering practice, on the one hand, in order to prevent high fill slope instability. It is necessary to calculate the slope stability in the engineering construction. On the other hand, in order to ensure that the deformation of high filling subgrade meets the requirements of specifications, it is necessary to predict the deformation of subgrade in the process of filling. In addition, the stability of roadbed is affected by subgrade filling technology. Therefore, it is very important to master the construction technology theory and method of high-fill subgrade. In this paper, the stability of high embankment is studied, and the slope stability of high embankment under different working conditions is calculated and analyzed by using the limit equilibrium method to discuss the slope progression and slope ratio. The influence of platform width and other factors on slope stability; At the same time, the finite difference method is used to calculate and analyze the subgrade deformation of high embankment under different working conditions, so as to reveal the influence of slope grade, slope ratio and filling thickness on the subgrade deformation. Combined with the concept of moisture content and compaction, the construction technology is studied. The main work and conclusions of this paper are as follows: 1) because the slope height of high embankment is high, the slope stability must be checked and calculated. In this paper, the developed limit equilibrium method is used to analyze the slope stability. In this paper, the Swedish arc method, which is the most commonly used method of limit equilibrium, is used to study the safety factor of slope by simplified Bishop method and Janbu method. At the same time, the high filling height of the embankment will lead to a large settlement of the foundation soil under the roadbed. In the process of filling, the deformation of the subgrade must be forecasted by calculation. Based on the basic principle of finite difference method, the deformation of roadbed is analyzed and studied in this paper. Based on the limit equilibrium method, the slope stability of high fill embankment under different working conditions is calculated and analyzed by using numerical simulation software to study different calculation methods and different slope series. The influence of different slope ratio and platform width on slope stability. Based on the finite difference method, the subgrade deformation of high embankment under different working conditions is calculated and analyzed by numerical simulation software, in order to study different slope series and different slope ratio. The influence of different filling thickness and other factors on subgrade deformation. The strength and stability of subgrade are greatly affected by the method and technology of subgrade filling, and the construction of subgrade is very important in highway traffic construction. The construction method and construction quality of the subgrade filling project directly affect the quality and cost of the corresponding project. Therefore, it is very important to master the construction technology theory and method of high filling soil subgrade. This paper is based on a highway subgrade project in Hunan Province. Based on the control method of water content and compaction degree of construction control, combined with subgrade construction technology and filling construction process as the main research object. The selection of roller compaction machine and the fast measuring method of moisture content and compaction degree are discussed in this paper.
【學(xué)位授予單位】：中南大學(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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