本文關(guān)鍵詞：V型溝谷巨粒土高填方路基修筑技術(shù)研究　出處：《重慶交通大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 巨粒土 V型溝谷 高路堤 格賓擋墻 有限元

【摘要】：山區(qū)公路常常需要頻繁跨越V型溝谷,溝谷地形復(fù)雜,修筑運(yùn)營過程中存在高填路堤整體沉降、局部沉降或邊坡失穩(wěn)等諸多病害,嚴(yán)重影響溝谷高填路基的質(zhì)量和運(yùn)營安全。巨粒土填料往往來源于隧道渣料,具有顆粒級配復(fù)雜和變異性大等特點(diǎn),填料的工程特性會對路基穩(wěn)定及變形產(chǎn)生較大影響。通常情況下,填土路基中填料(即土)的工程性質(zhì)主要受粒徑大于2mm的粗顆粒、帶黏性的細(xì)顆粒及無黏性的粉粒含量的影響。因此,提高V型溝谷地帶巨粒土高填路基的穩(wěn)定性已成為山區(qū)公路建設(shè)亟待解決的問題。本論文以雁楠公路巨粒土高填方路基工程項目為依托,對以巨粒土為主的隧道渣料作為筑路材料的V型溝谷超高路堤+支擋結(jié)構(gòu)路基的設(shè)計與修筑技術(shù)展開研究。第一,通過對巨粒土渣料的物理力學(xué)特性的研究,分析不同含水量和不同壓實度下強(qiáng)度指標(biāo)的變化規(guī)律,評價巨粒土隧道渣料作為路基填料的適應(yīng)性和可行性。第二,提出了板樁擋墻強(qiáng)腳和C25片石砼錨桿抗滑擋墻強(qiáng)腳兩種設(shè)計方案,并利用有限元方法,對兩種方案的變形和穩(wěn)定性進(jìn)行計算。對比分析最終選板樁擋墻強(qiáng)腳設(shè)計方案建立二維平面彈塑性模型,對路堤特征斷面溝谷斜坡填料與地面的結(jié)合模式、壓實度、格賓網(wǎng)對路堤穩(wěn)定及變形的影響進(jìn)行分析。第三,建立三維有限元模型,分析不同填筑高度和不同壓實度條件下V型溝谷超高路堤的沉降和穩(wěn)定性的變化規(guī)律,得到V型溝谷超高填方+支擋結(jié)構(gòu)路基的沉降變形、側(cè)向位移發(fā)生及發(fā)展規(guī)律和土壓力的大小。研究結(jié)果表明V型溝谷超高路堤三維沉降值、三維穩(wěn)定系數(shù)與二維值相比,更加符合V型溝谷超高路堤的三維邊界效應(yīng)及實際工程應(yīng)用,有利于正確評價溝谷超高路堤的沉降和穩(wěn)定性。第四,在對加筋格賓擋墻的組成、特點(diǎn)、設(shè)計理論進(jìn)行分析總結(jié)的基礎(chǔ)上,結(jié)合實際工程采用有限元數(shù)值模擬分析不同尺寸格賓網(wǎng)加筋格賓擋土墻穩(wěn)定性及變形,并對格賓擋土墻耐久性進(jìn)行了分析。第五,提出隧道渣料作為筑路材料進(jìn)行V型溝谷超高填方+支擋結(jié)構(gòu)路基的施工方案和技術(shù)措施。路堤采用分層填筑分層碾壓并采用經(jīng)驗法、沉降差法控制填筑壓實質(zhì)量,借助水平位移基準(zhǔn)網(wǎng)和垂直位移基準(zhǔn)網(wǎng)對高路堤進(jìn)行監(jiān)測,路堤表面水平及垂向位移量均較小,內(nèi)部各點(diǎn)受力無明顯變化,路堤處于基本穩(wěn)定狀態(tài)。
[Abstract]:Mountain highway often needs to cross V-type valley frequently. The terrain of valley is complex. There are many diseases such as overall settlement of high fill embankment local settlement or slope instability in the course of construction and operation. The quality and operation safety of high filling subgrade in gully and valley are seriously affected. The giant grained soil fillers often come from tunnel slag and have the characteristics of complex particle gradation and high variability. The engineering characteristics of fillers have a great influence on the stability and deformation of subgrade. Usually, the engineering properties of fillers in subgrade are mainly affected by coarse particles larger than 2mm in diameter. The effect of the content of fine and non-viscous particles. To improve the stability of high-fill subgrade in V-type gully zone has become the urgent problem of highway construction in mountainous area. This paper relies on the project of high-filling roadbed of Yannan highway. In this paper, the design and construction technology of the subgrade with the V-shaped gully super-high embankment supported by the tunnel slag as the road construction material is studied. Firstly, the physical and mechanical properties of the mega grained soil slag are studied. Analyze the change law of strength index under different water content and different compaction degree, evaluate the adaptability and feasibility of giant granular soil tunnel slag as subgrade filler. Two design schemes of strong foot of plate pile retaining wall and C25 flake concrete anchor are put forward, and the finite element method is used. The deformation and stability of the two schemes are calculated. Finally, a two-dimensional elastic-plastic model is established by comparing and analyzing the design scheme of the strong foot of the plate selection pile retaining wall, and the combination model between the filling and the ground of the embankment with the characteristic section of the gully slope is proposed. Compaction degree and the effect of Gabin net on stability and deformation of embankment are analyzed. Thirdly, three-dimensional finite element model is established. The variation law of settlement and stability of V type gully super-high embankment under different filling height and different compaction degree is analyzed, and the settlement deformation of V type gully super-high fill embankment is obtained. The occurrence and development of lateral displacement and the magnitude of earth pressure. The results show that the three dimensional settlement value and the three dimensional stability coefficient are compared with the two dimensional values. It is more in line with the three-dimensional boundary effect of V-type gully super-high embankment and its practical engineering application, which is conducive to the correct evaluation of settlement and stability of the super-high gully embankment. 4th, the composition and characteristics of reinforced Gabin retaining wall. Based on the analysis and summary of the design theory, the finite element numerical simulation is used to analyze the stability and deformation of the reinforced gribbin retaining wall with different sizes. The durability of GB retaining wall is analyzed. 5th. The construction scheme and technical measures of V-type gully super-high fill embankment with tunnel slag as road construction material are put forward. The embankment is compacted by layered filling and stratified compaction and empirical method is adopted. The settlement difference method controls the filling compaction quality and monitors the high embankment with the help of the horizontal displacement reference network and the vertical displacement reference network. The horizontal and vertical displacement of the embankment surface is smaller and the internal stress does not change obviously. The embankment is basically stable.
【學(xué)位授予單位】：重慶交通大學(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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本文編號：1376042