本文關(guān)鍵詞： 淺埋偏壓 連拱隧道 施工變形 數(shù)值模擬 監(jiān)控量測　出處：《西安建筑科技大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：近年來,隨著我國經(jīng)濟的快速發(fā)展,我國高速公路隧道工程技術(shù)水平得到了迅速推進,由于連拱隧道能夠更好地適應(yīng)山區(qū)特殊地形,線形流暢,近年來連拱隧道越來越多的被實際工程所應(yīng)用。論文以湖北天鵝連拱隧道為背景,采用有限元軟件MIDAS/GTS對偏壓連拱隧道的施工過程進行數(shù)值模擬,通過對圍巖和支護結(jié)構(gòu)應(yīng)力應(yīng)變規(guī)律的研究,對不同開挖方案和開挖順序優(yōu)化分析,結(jié)合現(xiàn)場監(jiān)控量測資料,應(yīng)用灰色建模理論對監(jiān)測數(shù)據(jù)進行分析預(yù)測。論文的主要研究成果為:(1)采用三導(dǎo)洞法施工時,隧道施工完成后應(yīng)力最大值在出口處中隔墻的左側(cè)腰部和腳部為9.0MPa;采用中導(dǎo)洞法施工時,左洞上臺階開挖后,左洞仰拱部分松動區(qū)和先前開挖中導(dǎo)洞時形成的松動區(qū)相互重疊形成一體,隧道施工完成后應(yīng)力最大值在中隔墻為10.3MPa。采用三導(dǎo)洞施工左右洞最終沉降為12.25mm,10.09mm,而采用中導(dǎo)洞施工,左右洞的最終沉降值為13.14mm,10.95mm。三導(dǎo)洞法開挖中隔墻拱頂、腰部和底部應(yīng)力值分別為4.6MPa、2.6MPa和3.0MPa,小于中導(dǎo)洞法的5.0MPa、3.0MPa和4.0MPa,說明先行開挖兩側(cè)導(dǎo)洞能夠釋放部分圍巖壓力,有效減小中隔墻的受力。(2)就中隔墻而言,左洞先行開挖(工況一)中隔墻最大壓應(yīng)力為11.0MPa小于右洞先行開挖(工況二)的最大壓應(yīng)力值12.0MPa,對于中隔墻最大拉應(yīng)力值,工況一為1.2MPa小于工況二最大值2.8MPa;從初襯受力情況來看,工況一和工況二的最大位移值分別為19.23mm、24.97mm,初襯最大拉應(yīng)力分別為1.1MPa、2.1MPa,最大壓應(yīng)力分別為8.4MPa、10.0MPa。從圍巖塑性區(qū)來看,工況一的塑性區(qū)主要分布在兩側(cè)拱腰處和中隔墻頂端,工況二的圍巖塑性區(qū)位于中隔墻頂部偏壓側(cè)及兩側(cè)拱腰處。(3)ZK72+755斷面拱頂沉降、水平收斂、仰拱沉降的預(yù)測值分別為20.78mm、7.49mm、10.50mm;經(jīng)過現(xiàn)場監(jiān)控量測,ZK72+755斷面的實測值分別為21.00mm、7.68mm、9.45mm。由此可見,方程預(yù)測接近實測值,可見,灰色GM(1,1)模型可以準(zhǔn)確的模擬圍巖的時間位移序列,預(yù)測精度達到了隧道安全施工的要求。(4)天鵝連拱隧道的拱頂沉降、水平收斂和仰拱沉降趨于穩(wěn)定時的位移分別為:15.0mm、5.0mm和8.0mm,穩(wěn)定所需時間為35天左右。拱頂沉降和仰拱沉降值較大。初襯與圍巖接觸壓力隨著掌子面的推進基本呈逐漸增長態(tài)勢,監(jiān)測點在開挖35天左右,壓力值趨于穩(wěn)定,左拱肩承受的壓力基本都大于右拱肩。
[Abstract]:In recent years, with the rapid development of China's economy, China's highway tunnel engineering technology has been advancing rapidly, because the arch tunnel can better adapt to the special terrain and terrain, streamline, arch tunnel in recent years has been more and more practical engineering applications. This paper takes Hubei Swan arch tunnel as the background of numerical simulation of the construction process using finite element software MIDAS/GTS to bias arch tunnel, through the research on the stress and strain of the surrounding rock and supporting structure, to different excavation schemes and optimization of excavation sequence analysis, combined with field monitoring data, the grey modeling theory is applied to analyze and forecast the monitoring data of the main research results of this paper. As follows: (1) the three heading construction, tunnel construction after the completion of the maximum stress in the wall at the outlet of the left side of the waist and feet is 9.0MPa; the heading construction, left Bench tunnel after excavation, part of loose zone of left tunnel invert and loose zone formed previously in the excavation of pilot tunnels overlapping integrated tunnel construction after the completion of the maximum stress in the walls for the 10.3MPa. using the three heading construction hole about final settlement of 12.25mm, 10.09mm, and used the heading construction, final settlement. The hole is 13.14mm, 10.95mm. three heading excavation method of partition in the vault, waist and bottom stress values were 4.6MPa, 2.6MPa and 3.0MPa, less than the central drift method of 5.0MPa, 3.0MPa and 4.0MPa, indicating the excavation in advance on both sides of the guide hole can release the pressure of surrounding rock, effectively reduce the wall stress (2) on the wall. First, the left tunnel excavation (condition) the maximum compressive stress is less than 11.0MPa in the wall of right tunnel excavation in advance (case two) the maximum stress value of 12.0MPa, the partition of the maximum value of tensile stress, a condition for less than 1.2MPa conditions The maximum value of two 2.8MPa; from the lining stress situation, the maximum displacement and the status of the two values were 19.23mm, 24.97mm, lining the maximum tensile stress were 1.1MPa, 2.1MPa, the maximum compressive stress of 8.4MPa, 10.0MPa. from the surrounding rock plastic zone, plastic zone of the main conditions of a distribution on both sides of the arch waist and in the top of the partition, the plastic zone of the surrounding rock condition two is located in the side wall top bias on both sides and the arch waist. (3) ZK72+755 section vault settlement, horizontal convergence, forecast the settlement value of inverted arch were 20.78mm, 7.49mm, 10.50mm; through field monitoring, measurement of ZK72+755 section the values were 21.00mm, 7.68mm, 9.45mm. shows that the equation predicts close to the measured values, the grey GM (1,1) model can accurate simulation of surrounding rock displacement time series, the forecast accuracy of the tunnel construction safety requirements. (4) the settlement of the Swan arch tunnel vault, Horizontal convergence and invert displacement stable were: 15.0mm, 5.0mm and 8.0mm, time required for 35 days. The vault settlement and the settlement value is larger. The inverted arch lining and surrounding rock stress with the working face of the advancing basic showed a gradual growth, monitoring points in the excavation of 35 days or so, pressure the value tends to be stable, the left spandrel pressure are greater than the right shoulder.

【學(xué)位授予單位】：西安建筑科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U455.4

【參考文獻】

相關(guān)期刊論文 前10條

1 劉斌,劉思峰,黨耀國;基于灰色系統(tǒng)理論的時序數(shù)據(jù)挖掘技術(shù)[J];中國工程科學(xué);2003年09期

2 任少強;;大跨度雙連拱公路隧道數(shù)值模擬與圍巖穩(wěn)定分析[J];中國工程科學(xué);2009年08期

3 王義國;吉安俊;丁崢時;呂國良;李俊;;灰色預(yù)測模型在隧道圍巖變形中應(yīng)用研究[J];建筑結(jié)構(gòu);2010年S1期

4 郝行舟;馬海君;;大跨度連拱隧道圍巖監(jiān)控量測在施工中的應(yīng)用[J];交通科技;2006年01期

5 霍潤科;顏明圓;宋戰(zhàn)平;;地鐵車站深基坑開挖監(jiān)測與數(shù)值分析[J];鐵道工程學(xué)報;2011年05期

6 周玉宏,趙燕明,程崇國;偏壓連拱隧道施工過程的優(yōu)化研究[J];巖石力學(xué)與工程學(xué)報;2002年05期

7 劉小軍;張永興;;淺埋偏壓隧道洞口段合理開挖工序及受力特征分析[J];巖石力學(xué)與工程學(xué)報;2011年S1期

8 丁萬濤;李術(shù)才;王書剛;;龍?zhí)端淼绹鷰r收斂變形灰色系統(tǒng)預(yù)測模型[J];巖土力學(xué);2006年S1期

9 霍潤科;周鋒;倫培元;;四聯(lián)拱淺埋暗挖隧道施工監(jiān)測與數(shù)值分析[J];西安建筑科技大學(xué)學(xué)報(自然科學(xué)版);2013年03期

10 賈超;張婷媚;劉凱;;基于隨機可靠度的連拱隧道中墻厚度優(yōu)化研究[J];現(xiàn)代隧道技術(shù);2013年06期

相關(guān)博士學(xué)位論文 前3條

1 吳夢軍;大跨扁平連拱隧道施工時空效應(yīng)與二次襯砌最佳支護時機研究[D];重慶大學(xué);2011年

2 林剛;連拱隧道施工力學(xué)行為研究[D];西南交通大學(xué);2005年

3 王朝令;隧道地震超前預(yù)報中波場分離與反演方法的數(shù)值模擬研究[D];西南交通大學(xué);2012年

相關(guān)碩士學(xué)位論文 前2條

1 于振振;基于監(jiān)控量測與數(shù)值模擬的隧道圍巖穩(wěn)定性分析[D];西安建筑科技大學(xué);2011年

2 馬超方;連拱隧道中隔墻施工力學(xué)行為研究[D];吉林大學(xué);2013年

，

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