本文選題：隧道原位擴(kuò)建 + 預(yù)測(cè)��； 參考：《華僑大學(xué)》2014年碩士論文

【摘要】：近年來(lái)，國(guó)內(nèi)外隧道原位擴(kuò)建工程日益增多。隧道原位擴(kuò)建工程大多呈現(xiàn)出斷面特大、凈距超小、扁平率極低等特點(diǎn)，且往往須先拆除既有襯砌，再進(jìn)行圍巖開挖、襯砌施作等工序，易導(dǎo)致結(jié)構(gòu)承載力降低，圍巖變形過(guò)大，誘發(fā)塌方事故。較之于新建隧道，，隧道原位擴(kuò)建開挖導(dǎo)致的圍巖變形及地表沉降更為復(fù)雜，如何對(duì)其進(jìn)行合理預(yù)測(cè)仍是一個(gè)十分突出且尚未解決的問題。 本文以國(guó)內(nèi)外罕見的大帽山隧道原位2擴(kuò)4工程為研究背景，通過(guò)解析求解、數(shù)值模擬、經(jīng)驗(yàn)公式等3種方法提出隧道原位擴(kuò)建圍巖變形與地表沉降預(yù)測(cè)方法，對(duì)隧道原位擴(kuò)建工程圍巖變形及地表沉降變形規(guī)律、卸荷效應(yīng)下圍巖變形及力學(xué)特性、圍巖力學(xué)參數(shù)對(duì)地表沉降的敏感性進(jìn)行了系統(tǒng)的研究，對(duì)保證類似工程圍巖穩(wěn)定性具有重要的參考價(jià)值。主要工作及成果如下： 1、采用等代圓、復(fù)變函數(shù)理論及Schwarz交替法獲得非圓隧道單側(cè)擴(kuò)建形式下的圍巖應(yīng)力及位移的理論解。據(jù)此以大帽山隧道原位2擴(kuò)4工程為例探討隧道最優(yōu)擴(kuò)挖寬度。 2、基于卸荷理論提出并建立隧道圍巖擾動(dòng)分區(qū)（強(qiáng)卸荷擾動(dòng)區(qū)、弱卸荷擾動(dòng)區(qū)及未擾動(dòng)區(qū)）開挖卸荷的計(jì)算方法。 3、采用APDL語(yǔ)言編程，將卸荷計(jì)算各步驟嵌入ANSYS通用有限元軟件，實(shí)現(xiàn)卸荷效應(yīng)下的隧道原位擴(kuò)建三維數(shù)值模擬。 4、以實(shí)測(cè)數(shù)據(jù)為據(jù)，分析卸荷效應(yīng)下大帽山隧道原位2擴(kuò)4工程CD工法下圍巖力學(xué)及變形特性，圍巖強(qiáng)卸荷擾動(dòng)區(qū)、弱卸荷擾動(dòng)區(qū)的分布規(guī)律。 5、2擴(kuò)4隧道對(duì)已建4車道隧道結(jié)構(gòu)變形影響為：4車道隧道左側(cè)圍巖處于卸荷擾動(dòng)區(qū)范圍內(nèi)，左側(cè)變形較右側(cè)大，隧道斷面呈現(xiàn)明顯的偏壓。 6、圍巖力學(xué)參數(shù)對(duì)隧道原位擴(kuò)建地表沉降的敏感程度為： E c。 7、采用Peck公式、疊加原理提出擴(kuò)建隧道地表沉降的簡(jiǎn)便預(yù)測(cè)公式，并驗(yàn)證函數(shù)關(guān)系式的適用性。
[Abstract]:In recent years, the domestic and foreign tunnel in situ expansion project is increasing day by day. Most of the in-situ expansion projects of tunnel show the characteristics of super large section, super-small net distance and extremely low flat rate, and it is often necessary to remove the existing lining first, then excavate the surrounding rock and construct the lining, which will easily lead to the reduction of the bearing capacity of the structure. The deformation of surrounding rock is too large, which induces collapse accident. Compared with the new tunnel, the surrounding rock deformation and surface settlement caused by in-situ tunnel expansion and excavation are more complex. How to predict it reasonably is still a very outstanding and unsolved problem. In this paper, based on the domestic and foreign rare in situ 2 expansion 4 project of Tai Mo Shan Tunnel as the research background, through analytical solution, numerical simulation, Three methods, such as empirical formula, are put forward to predict the deformation of surrounding rock and surface settlement of tunnel in situ expansion. The deformation and mechanical properties of surrounding rock under unloading effect are studied. The sensitivity of mechanical parameters of surrounding rock to surface subsidence is studied systematically, which is of great reference value to guarantee the stability of surrounding rock of similar engineering. The main work and results are as follows: 1. The theoretical solution of surrounding rock stress and displacement in the form of unilateral expansion of non-circular tunnel is obtained by using the theory of equivalent circle, complex variable function and Schwarz alternating method. Based on this, the optimal width of tunnel expansion and excavation is discussed by taking the in-situ 2 extension 4 project of Tai Mo Shan Tunnel as an example. 2. Based on the unloading theory, the disturbance zone of surrounding rock of the tunnel (strong unloading disturbance zone) is proposed and established. The calculation method of excavating unloading in weak unloading disturbed zone and undisturbed zone). 3. Using APDL programming language, the unloading calculation steps are embedded in ANSYS universal finite element software. Three-dimensional numerical simulation of in-situ tunnel expansion under unloading effect is realized. 4. Based on the measured data, the mechanical and deformation characteristics of surrounding rock and the disturbed zone of strong unloading of surrounding rock are analyzed under the CD method of in-situ extension 4 project of Damaoshan Tunnel under unloading effect. The distribution of the weak unloading disturbance zone. The influence of the structure deformation on the existing 4-lane tunnel is that the surrounding rock on the left side of the four-lane tunnel is in the range of unload disturbance, and the deformation on the left side is larger than that on the right side. The tunnel section shows obvious bias voltage. 6. The sensitivity of surrounding rock mechanics parameters to the ground settlement of in-situ expansion of tunnel is: E.7. by using Peck formula and superposition principle, a simple prediction formula for ground subsidence of extended tunnel is put forward. The applicability of the function relation is verified.
【學(xué)位授予單位】：華僑大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U452.1;TU43

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 韓梅;;開挖卸荷理論在隧道工程中的應(yīng)用[J];西北水電;2009年01期

2 凌建明,劉堯軍;卸荷條件下地下洞室圍巖穩(wěn)定的損傷力學(xué)分析方法[J];石家莊鐵道學(xué)院學(xué)報(bào);1998年04期

3 王福喜,鐵大禹,張奐玉,張弛;徐州東二環(huán)路擴(kuò)建隧道工程施工有限元模擬分析[J];沈陽(yáng)建筑大學(xué)學(xué)報(bào)(自然科學(xué)版);2005年02期

4 程壯;董艷華;黨莉;宛良朋;;基于加載與卸荷理論的某地下廠房圍巖變形穩(wěn)定分析對(duì)比研究[J];三峽大學(xué)學(xué)報(bào)(自然科學(xué)版);2012年02期

5 廖紅建;卿偉宸;張志剛;周冬峰;;黃土地層盾構(gòu)隧道開挖對(duì)地表沉降影響的有限元分析[J];西安交通大學(xué)學(xué)報(bào);2006年11期

6 孫成偉;張碧文;;廣州地鐵東山口站站臺(tái)隧道擴(kuò)挖修建技術(shù)[J];現(xiàn)代隧道技術(shù);2012年03期

7 任建喜,葛修潤(rùn),蒲毅彬,馬巍,朱元林;巖石卸荷損傷演化機(jī)理CT實(shí)時(shí)分析初探[J];巖石力學(xué)與工程學(xué)報(bào);2000年06期

8 李建林,孟慶義;卸荷巖體的各向異性研究[J];巖石力學(xué)與工程學(xué)報(bào);2001年03期

9 趙明階,許錫賓,徐 蓉;巖石在三軸加卸荷過(guò)程中的一種本構(gòu)模型研究[J];巖石力學(xué)與工程學(xué)報(bào);2002年05期

10 周火明,盛謙,李維樹,肖國(guó)強(qiáng);三峽船閘邊坡卸荷擾動(dòng)區(qū)范圍及巖體力學(xué)性質(zhì)弱化程度研究[J];巖石力學(xué)與工程學(xué)報(bào);2004年07期

本文編號(hào)：2007863