本文選題：擠壓破碎圍巖 + 注漿試驗(yàn)��； 參考：《西安建筑科技大學(xué)》2015年碩士論文

【摘要】：在隧道修建過(guò)程中,高地應(yīng)力擠壓破碎帶圍巖大變形易導(dǎo)致侵限、鋼拱架凸出、初襯混凝土剝落、甚至塌方等災(zāi)害,已經(jīng)成為當(dāng)前亟需解決處理的重點(diǎn)和難點(diǎn)。由于導(dǎo)致隧道產(chǎn)生圍巖大變形的原因很多,其機(jī)理也各不相同,工程控制措施必須具有針對(duì)性。為有效的減小和防止隧道大變形災(zāi)害的發(fā)生,本文以十天高速略陽(yáng)連接線(xiàn)象山隧道為工程依托,采用理論分析、現(xiàn)場(chǎng)調(diào)查、現(xiàn)場(chǎng)試驗(yàn)以及數(shù)值模擬的方法,研究總結(jié)了高地應(yīng)力隧道圍巖大變形產(chǎn)生的機(jī)理及控制技術(shù),主要的研究成果如下:(1)調(diào)查分析了隧道大變形區(qū)域的水文地質(zhì)及現(xiàn)場(chǎng)施工情況,在大變形段初襯混凝土剝落、鋼拱架彎曲變形等問(wèn)題較為突出。利用現(xiàn)代量測(cè)技術(shù)對(duì)隧道進(jìn)行變形及內(nèi)力監(jiān)測(cè),通過(guò)分析得到了拱頂沉降、水平收斂、初襯與圍巖間內(nèi)力以及初襯與二襯間內(nèi)力都有著明顯的時(shí)空效應(yīng)。(2)以現(xiàn)場(chǎng)隧道施工工況為依據(jù),利用FLAC3D軟件,建立數(shù)值模型,并通過(guò)與現(xiàn)場(chǎng)監(jiān)測(cè)數(shù)據(jù)對(duì)比分析,驗(yàn)證了模型的合理性。重點(diǎn)分析了埋深及圍巖級(jí)別兩種因素對(duì)圍巖產(chǎn)生大變形的影響。(3)利用仿真模型試驗(yàn)?zāi)M現(xiàn)場(chǎng)圍巖注漿,對(duì)注漿效果進(jìn)行評(píng)價(jià),得出現(xiàn)場(chǎng)單液注漿和雙液注漿較為合理的水灰比及配比。并數(shù)值模擬分析了不同施工工藝對(duì)于圍巖變形的影響,得出了二襯較為合理的施做時(shí)機(jī)、開(kāi)挖臺(tái)階及循環(huán)進(jìn)尺長(zhǎng)度。進(jìn)而對(duì)現(xiàn)場(chǎng)隧道施工下的大變形控制起到了一定的指導(dǎo)意義。
[Abstract]:In the process of tunnel construction, large deformation of surrounding rock in high ground stress crushing zone will easily lead to invasion, steel arch frame protruding, initial lining concrete spalling, and even collapse and so on, which has become the focus and difficulty to solve at present. Since there are many reasons for the large deformation of surrounding rock in the tunnel, the mechanism of the tunnel is different, so the engineering control measures must be targeted. In order to effectively reduce and prevent the occurrence of the large deformation disaster of the tunnel, this paper takes the Xiangshan tunnel, a 10-day high-speed Luoyang connecting line, as the engineering support, and adopts the methods of theoretical analysis, field investigation, field test and numerical simulation. The mechanism and control technology of large deformation of surrounding rock of tunnel with high in-situ stress are studied and summarized. The main research results are as follows: 1) the hydrogeology and site construction in large deformation area of tunnel are investigated and analyzed, and the initial lining concrete peeling off in large deformation section. Steel arch frame bending deformation and other problems are more prominent. The deformation and internal force of the tunnel are monitored by the modern measurement technology. Through the analysis, the settlement of the vault is obtained, and the horizontal convergence is obtained. The internal force between the initial lining and the surrounding rock and the internal force between the initial lining and the second liner have obvious space-time effect. Based on the working conditions of the field tunnel construction, the numerical model is established by using FLAC3D software, and the numerical model is compared with the field monitoring data. The rationality of the model is verified. The influence of two factors, the depth of burying and the grade of surrounding rock, on the large deformation of surrounding rock is analyzed emphatically. The grouting effect of surrounding rock is evaluated by simulation model test. The reasonable water cement ratio and ratio of single and double liquid grouting are obtained. The influence of different construction technology on the deformation of surrounding rock is analyzed numerically, and the reasonable timing of the second lining, the excavation step and the length of the circular ruler are obtained. Furthermore, it plays a guiding role in the control of large deformation in the field tunnel construction.
【學(xué)位授予單位】：西安建筑科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：U455.49

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