本文選題：盾構(gòu)隧道 + 開挖面穩(wěn)定　； 參考：《湖南大學(xué)》2015年碩士論文

【摘要】：隨著我國(guó)經(jīng)濟(jì)實(shí)力的快速增長(zhǎng),全國(guó)各地的城市建設(shè)腳步不斷向前,許多地區(qū)的現(xiàn)有交通建設(shè)已不能滿足現(xiàn)代化城市的需求。如何有效地建設(shè)地下交通,以解決日益嚴(yán)峻的城市交通擁擠問題,已成為工程界與學(xué)術(shù)界共同關(guān)注的熱點(diǎn)問題。盾構(gòu)技術(shù)以施工速度快,勞動(dòng)強(qiáng)度低等優(yōu)點(diǎn)在地鐵施工中得到了廣泛應(yīng)用。而在工程實(shí)踐中,許多復(fù)雜的工程難題尚待解決,如何尋求更經(jīng)濟(jì)安全的施工方法,需要工程師與學(xué)者們來共同探討。當(dāng)盾構(gòu)機(jī)在迎坡條件下經(jīng)過軟硬不均的復(fù)合地層時(shí),由于線路坡度的影響和復(fù)合地層中上下土層的軟硬不均和強(qiáng)度差異較大,從而導(dǎo)致盾構(gòu)隧道開挖面支護(hù)力的控制與在平坡條件下的均質(zhì)地層相比,相對(duì)來說要難把控得多。該支護(hù)力若沒有施加得當(dāng),可能會(huì)導(dǎo)致盾構(gòu)隧道開挖面的坍塌和地表塌陷等一系列工程事故�；诖嗽�,本文對(duì)盾構(gòu)隧道在迎坡和復(fù)合地層條件下的的開挖面穩(wěn)定性進(jìn)行了針對(duì)性分析,以期為工程實(shí)踐提供指導(dǎo)。首先,選用有限元數(shù)值軟件ABAQUS進(jìn)行盾構(gòu)隧道開挖模擬。將計(jì)算結(jié)果與文獻(xiàn)參考值對(duì)比,以驗(yàn)證其在分析此問題上的可行性。接下來利用該數(shù)值軟件建立迎坡條件下復(fù)合地層中的盾構(gòu)隧道開挖模型,以分析開挖面的穩(wěn)定性。模擬得到了不同支護(hù)應(yīng)力比下的盾構(gòu)隧道開挖面前方土層的水平位移和豎向沉降等值云圖,結(jié)合前人研究,給出了盾構(gòu)隧道開挖面的極限支護(hù)力的值。然后分析開挖時(shí)的地表沉降規(guī)律。盾構(gòu)隧道開挖面前方地層的水平位移和豎向沉降的值隨支護(hù)力的逐漸降低而變大,而且影響的范圍的越來越大,其豎向沉降的影響范圍在隧道失穩(wěn)破壞的時(shí)候已經(jīng)擴(kuò)展到了地表,水平位移相對(duì)來說,其影響范圍則要小一些,水平位移的變化擴(kuò)展范圍僅集中在盾構(gòu)隧道開挖面的前方區(qū)域。并對(duì)隧道進(jìn)行了敏感性參數(shù)分析,討論了線路坡度、土體內(nèi)粘聚力和內(nèi)摩擦角對(duì)開挖面極限支護(hù)力的影響。其次,對(duì)已有楔形體模型進(jìn)行歸納總結(jié),基于極限平衡法及筒倉(cāng)理論提出了適用于迎坡條件下的復(fù)合地層中的楔形體模型,通過對(duì)平衡方程的求解得到極限支護(hù)力的表達(dá)式。進(jìn)一步分析了埋深、開挖面土層厚度以及線路坡度和土體強(qiáng)度指標(biāo)對(duì)極限支護(hù)力的影響。得到了如下結(jié)論:當(dāng)線路破度相差較大時(shí),開挖面極限支護(hù)力亦相差很大,迎坡條件與平坡條件應(yīng)加以區(qū)分,不可等同對(duì)待。地層情況較均勻,土體強(qiáng)度參數(shù)差異不大時(shí),考慮分層與否所得結(jié)果較為吻合;但在上下地層硬軟不均時(shí),其結(jié)果差異較大。最后,將前章所述的理論計(jì)算方法與有限元數(shù)值模擬方法應(yīng)用于工程實(shí)例,并進(jìn)行對(duì)比驗(yàn)證,證明利用本文方法研究盾構(gòu)隧道開挖面穩(wěn)定性問題的合理性與可行性。
[Abstract]:With the rapid growth of China's economic strength, the pace of urban construction in various parts of the country is constantly moving forward, and the existing traffic construction in many areas can no longer meet the needs of modern cities. How to effectively construct underground traffic to solve the increasingly serious urban traffic congestion has become a hot issue that the engineering and academic circles pay attention to. Shield technology has been widely used in subway construction with the advantages of fast construction speed and low labor intensity. In engineering practice, many complicated engineering problems remain to be solved. How to find more economical and safe construction methods needs engineers and scholars to discuss together. When the shield machine passes through the soft and hard composite strata under the condition of facing the slope, due to the influence of the gradient of the line and the difference of the soft and hard and the strength of the upper and lower soil layers in the composite stratum, Therefore, it is more difficult to control the support force of shield tunnel compared with the homogeneous stratum under the condition of flat slope. If the support force is not properly applied, it may lead to a series of engineering accidents such as excavation surface collapse and surface collapse of shield tunnel. For this reason, this paper analyzes the stability of excavation surface of shield tunnel under the conditions of facing slope and composite stratum, in order to provide guidance for engineering practice. Firstly, the finite element numerical software ABAQUS is used to simulate the excavation of shield tunnel. The results are compared with the reference values to verify the feasibility of the analysis. Then the excavation model of shield tunnel in composite stratum is established by using the numerical software to analyze the stability of excavating surface. The equivalent cloud map of horizontal displacement and vertical settlement in front of excavation surface of shield tunnel is obtained by simulation under different support stress ratio. Combined with previous studies, the value of limit support force of excavation surface of shield tunnel is given. Then the law of surface subsidence during excavation is analyzed. The horizontal displacement and vertical settlement of the stratum in front of the excavation surface of shield tunnel become larger with the decreasing of the supporting force, and the range of influence becomes larger and larger. The influence range of vertical settlement has been extended to the surface at the time of tunnel instability, but the horizontal displacement is relatively small, and the range of horizontal displacement is only concentrated in the front area of shield tunnel excavation surface. The sensitivity parameters of the tunnel are analyzed, and the effects of the slope of the tunnel, the cohesion of the soil and the angle of internal friction on the ultimate support force of the excavated surface are discussed. Secondly, based on the limit equilibrium method and silo theory, the wedge body model in composite strata is proposed, and the ultimate support force is obtained by solving the equilibrium equation. Furthermore, the influence of buried depth, excavation surface thickness, line slope and soil strength index on the ultimate support force is analyzed. The conclusions are as follows: when the breaking degree of the line is quite different, the ultimate support force of the excavated face is also very different, and the conditions of facing slope and the condition of flat slope should be distinguished and can not be treated equally. When the soil strength parameters are not different from each other, the results of stratification are consistent, but when the upper and lower strata are hard and soft, the results are quite different. Finally, the theoretical calculation method and the finite element numerical simulation method mentioned in the previous chapter are applied to engineering examples, and the feasibility and rationality of using this method to study the stability of excavation surface of shield tunnel are proved.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U455.43

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 范祚文;張子新;;砂卵石地層土壓力平衡盾構(gòu)施工開挖面穩(wěn)定及鄰近建筑物影響模型試驗(yàn)研究[J];巖石力學(xué)與工程學(xué)報(bào);2013年12期

2 陳孟喬;劉建坤;肖軍華;;砂土中盾構(gòu)隧道開挖面失穩(wěn)土體三維形狀分析[J];巖土力學(xué);2013年04期

3 白永學(xué);漆泰岳;李有道;趙毅;;淺埋砂卵石地層盾構(gòu)開挖面穩(wěn)定性影響因素研究[J];鐵道學(xué)報(bào);2013年03期

4 陳仁朋;齊立志;湯旅軍;周保生;;砂土地層盾構(gòu)隧道開挖面被動(dòng)破壞極限支護(hù)力研究[J];巖石力學(xué)與工程學(xué)報(bào);2013年S1期

5 劉宣宇;;盾構(gòu)技術(shù)的發(fā)展與展望[J];施工技術(shù);2013年01期

6 呂璽琳;王浩然;;軟土盾構(gòu)隧道開挖面支護(hù)壓力極限上限解[J];土木建筑與環(huán)境工程;2011年02期

7 楊峰;陽軍生;張學(xué)民;趙煉恒;;黏土不排水條件下淺埋隧道穩(wěn)定性上限有限元分析[J];巖石力學(xué)與工程學(xué)報(bào);2010年S2期

8 喬金麗;張義同;高健;;考慮滲流的多層土盾構(gòu)隧道開挖面穩(wěn)定性分析[J];巖土力學(xué);2010年05期

9 雷明鋒;彭立敏;施成華;趙丹;;迎坡條件下盾構(gòu)隧道開挖面極限支護(hù)力計(jì)算與分析[J];巖土工程學(xué)報(bào);2010年03期

10 喬金麗;張義同;高健;李艷艷;;強(qiáng)度折減法在盾構(gòu)隧道開挖面穩(wěn)定分析中的應(yīng)用[J];天津大學(xué)學(xué)報(bào);2010年01期

相關(guān)博士學(xué)位論文 前2條

1 湯旅軍;干砂和飽和砂性土中盾構(gòu)開挖面穩(wěn)定數(shù)值和離心試驗(yàn)研究[D];浙江大學(xué);2014年

2 秦建設(shè);盾構(gòu)施工開挖面變形與破壞機(jī)理研究[D];河海大學(xué);2005年

相關(guān)碩士學(xué)位論文 前4條

1 唐麗芝;雙地層盾構(gòu)隧道開挖面穩(wěn)定性研究[D];湖南大學(xué);2014年

2 陳強(qiáng);上軟下硬地層中盾構(gòu)隧道開挖面支護(hù)壓力研究[D];華中科技大學(xué);2010年

3 劉棟;復(fù)合地層中土壓盾構(gòu)隧道開挖面穩(wěn)定性研究[D];華中科技大學(xué);2009年

4 俞濤;地鐵盾構(gòu)隧道近接施工影響的數(shù)值模擬及模型試驗(yàn)研究[D];西南交通大學(xué);2005年

，

本文編號(hào)：1868823