本文關鍵詞：蘭新高鐵碎屑流及薄層板巖隧道施工變形控制技術　出處：《北京交通大學》2015年博士論文　論文類型：學位論文

  更多相關文章： 高原隧道 高鐵隧道 碎屑流 高地應力 薄層板巖 大變形 支護技術 預留變形量 機械降效

【摘要】：在青藏高原修建高鐵長大隧道是一個世界性的技術難題,設計施工中會遇到一系列的風險和困難,高鐵隧道修建標準更高,應對復雜地質困難的方法更難以把握。蘭新高鐵是目前世界上海拔最高的高速鐵路,大梁隧道、祁連山隧道是蘭新鐵路海拔最高點,3800米,也是目前世界上海拔最高的高鐵隧道,其修建過程中遇到了許多意想不到的困難,需要開展科技創(chuàng)新去解決。本文依托上述兩座Ⅰ級風險隧道建設,對部分技術難題開展研究,主要內容為：隧道穿越碎屑流地層施工技術、高地應力薄層板巖隧道施工大變形控制技術、高原長大隧道機械降效量化指標研究。主要研究內容和成果如下：(1)通過理論分析及現(xiàn)場試驗,揭示了碎屑流的工程特性,其主要組成為斷層角礫、碎屑顆粒、砂土和水的混合物質,具有重度大、黏度高、流動性強、突發(fā)性強的特性,且分布范圍廣,隧道施工中難以預判。通過對隧道施工中碎屑流形成機理的研究,提出了碎屑流形成的三個階段,即：先兆階段、影響階段、發(fā)生階段。(2)結合祁連山隧道碎屑流段的工程施工,采用現(xiàn)場試驗及理論分析方法,研究了隧道支護技術及開挖方法,提出了以碎屑體超前預報、掌子面封堵、超前高位泄水、超前強支護、強初期支護為核心的碎屑流地層高鐵大斷面隧道施工技術。(3)結合大梁隧道高地應力薄層板巖大變形控制難題,通過地應力的現(xiàn)場測試及圍巖特性的試驗分析,得出水平地應力(7.18～25.14MPa)大于垂直地應力,圍巖強度與應力比在0.025～0.126范圍,揭示了大梁隧道薄層板巖段變形為擠壓型大變形,提出了高地應力薄層板巖隧道大變形分為嚴重大變形、中等大變形、輕微大變形和無大變形四級。(4)通過對系統(tǒng)錨桿的現(xiàn)場試驗及數(shù)值模擬分析,得出了薄層板巖(Vc-2)系統(tǒng)錨桿效果不明顯。通過對單層格柵、單層H175型鋼、格柵+I20型鋼雙層支護的對比試驗,得出雙層支護控制變形效果最好,其次是單層H175型鋼,單層格柵最差。(5)在嚴重大變形段,選取逐漸增強支護參數(shù)及預留變形量的四個試驗段,分別進行現(xiàn)場試驗,提出合理的預留變形量為50cm,并經(jīng)過大量隧道變形數(shù)據(jù)統(tǒng)計分析,驗證了該預留變形量具有95%以上的概率不侵限。(6)以高原環(huán)境實驗艙配合發(fā)動機進氣氮氣摻混的方法,完成柴油機工作性能高原隧道環(huán)境模擬測試平臺的設計和搭建,獲得高原隧道施工環(huán)境下動力機械降效的量化評價。對高原長大隧道施工的設備配套及機械定額完善提供了支持。
[Abstract]:It is a worldwide technical problem to build the long tunnel of high-speed railway in Qinghai-Tibet Plateau. There will be a series of risks and difficulties in the design and construction of the tunnel, and the construction standard of the tunnel is higher. It is even more difficult to grasp the methods to deal with the complex geological difficulties. Lanxin high-speed railway is the highest elevation high-speed railway in the world at present, the Daliang Tunnel and Qilian Mountain Tunnel are the highest elevation of the Lanxin Railway 3800 meters above sea level. It is also the highest-elevation high-speed railway tunnel in the world at present, its construction process has encountered many unexpected difficulties, need to carry out scientific and technological innovation to solve. This paper relies on the above two class I risk tunnel construction. The main contents of this paper are as follows: the construction technology of tunnel through clastic flow and the control technology of large deformation in the construction of thin layer slate tunnel with high ground stress. The main contents and results of this study are as follows: 1) through theoretical analysis and field tests, the engineering characteristics of debris flow are revealed, the main composition of which is fault breccia. Clastic particles, sand and water mixture, with heavy, high viscosity, strong fluidity, sudden strong characteristics, and a wide range of distribution. It is difficult to predict the formation of debris flow in tunnel construction. Through the study of formation mechanism of debris flow in tunnel construction, three stages of formation of debris flow are put forward, namely: precursor stage and influence stage. In combination with the engineering construction of the debris flow section of Qilian Mountain Tunnel, the supporting technology and excavation method of the tunnel are studied by field test and theoretical analysis method, and the advanced prediction of the debris body is put forward. Face sealing, leading high water discharge, leading strong support, strong initial support as the core of high speed large section tunnel construction technology, combined with Daliang tunnel high ground stress thin layer slate large deformation control problem. Based on the field test of in-situ stress and the experimental analysis of surrounding rock characteristics, it is concluded that the horizontal in-situ stress is higher than that of vertical geostress. The ratio of strength to stress of surrounding rock is in the range of 0.025 ~ 0.126, which reveals that the deformation of thin layer slate section of Daliang tunnel is large and extruded, and puts forward that the large deformation of thin-layer slate tunnel with high in-situ stress can be divided into serious and large deformation. Medium large deformation, slight large deformation and no large deformation 4. 4) through the field test and numerical simulation analysis of the system anchor rod. It is concluded that the effect of bolt in thin layer slate Vc-2) system is not obvious. Through the comparison test of single-layer grille, single-layer H175 steel and grille I20 steel double-layer support. The results show that the best deformation control effect is double-layer support, followed by single-layer H175 steel, single-layer grille worst in the serious large deformation section, select gradually enhanced support parameters and reserve deformation of the four test sections. A reasonable reserve deformation of 50 cm was put forward, and a large number of tunnel deformation data were statistically analyzed. It is verified that the reserved deformation amount has a probability of more than 95% and no invasion limit. 6) the method of mixing the engine intake nitrogen gas with the plateau environment experimental cabin is verified. Completed the diesel engine performance plateau tunnel environment simulation test platform design and construction. The quantitative evaluation of power mechanical efficiency in plateau tunnel construction environment is obtained, which provides support for the equipment matching and mechanical quota improvement of plateau tunnel construction.
【學位授予單位】：北京交通大學
【學位級別】：博士
【學位授予年份】：2015
【分類號】：U455.4

【相似文獻】

相關期刊論文 前10條

1 路石;微型隧道施工操作的模擬分析[J];鐵道建筑;2001年03期

2 路石;微型隧道施工必須考慮的事項[J];鐵道建筑;2001年05期

3 ;隧道施工的好幫手[J];機電新產(chǎn)品導報;2001年Z1期

4 徐上進;風險管理方法在隧道施工中的應用[J];山西建筑;2003年03期

5 高辛財,劉維寧;隧道施工期間的環(huán)境保護分析與對策[J];鐵道建筑技術;2003年01期

6 ;廈蓉高速肇興隧道施工進展順利[J];公路隧道;2009年02期

7 沈佳程;;隧道施工中的安全問題及對策[J];科技創(chuàng)新導報;2010年13期

8 張文元;;隧道施工中的問題探析[J];科技資訊;2010年15期

9 但斌;;關于隧道施工安全風險評估與分析的教學[J];科學咨詢(科技管理);2010年07期

10 謝鐘輝;;淺談隧道施工有效措施[J];科技資訊;2011年13期

相關會議論文 前10條

1 胡政才;;隧道施工管理軟件與管理水平[A];中國土木工程學會隧道及地下工程學會第七屆年會暨北京西單地鐵車站工程學術討論會論文集（下）[C];1992年

2 茍}松;崣幫喜;iJ立新;;隧道施工通槰自R湛刂葡祡q研究[A];第十一屆海峽兩岸隧道與地下工程學術與技術研討會論文集（D卷）[C];2012年

3 寇明旭;;隧道施工廢水對地表水環(huán)境的影響[A];中國鐵道學會環(huán)境保護委員會（環(huán)境影響評價學組）第三屆學術交流會論文集2007～2009[C];2009年

4 陳小雄;;隧道施工重大事故防范的幾點思考[A];湖北公路交通防災救災安保工程專家論壇專輯[C];2008年

5 李永生;楊立新;茍紅松;;隧道施工環(huán)境舒適性研究[A];2012年中鐵隧道集團低碳環(huán)保優(yōu)質工程修建技術專題交流會論文集[C];2012年

6 胡平;，

本文編號：1398842