【摘要】：關(guān)埡子隧道圍巖巖性較差,風(fēng)化及巖石破碎程度隨里程變化無(wú)明顯規(guī)律,圍巖層間夾雜大量弱膠結(jié)礦物,節(jié)理發(fā)育,開(kāi)挖后基本無(wú)自穩(wěn)能力,且圍巖暴露后強(qiáng)度衰減較快,遇空氣具有膨脹、疏松的特點(diǎn),遇水軟化,具有明顯的軟巖持續(xù)變形特征。因此,為保證隧道施工的安全進(jìn)行,針對(duì)前述問(wèn)題展開(kāi)研究,相關(guān)研究成果可為該隧道施工提供指導(dǎo),也可為類似隧道設(shè)計(jì)和施工提供參考。主要的研究工作和成果如下:(1)通過(guò)對(duì)圍巖巖樣微觀結(jié)構(gòu)的觀察,對(duì)巖樣進(jìn)行了巖相鑒定,確定為絹云母千枚巖。巖石力學(xué)特性試驗(yàn)測(cè)試了巖石的物理、水理性質(zhì)及巖石的強(qiáng)度指標(biāo)。(2)根據(jù)現(xiàn)場(chǎng)取樣所獲得巖石力學(xué)特性測(cè)試試驗(yàn)數(shù)據(jù),結(jié)合現(xiàn)場(chǎng)實(shí)際對(duì)關(guān)埡子隧道大變形機(jī)理進(jìn)行分析發(fā)現(xiàn),隧道開(kāi)挖后短期內(nèi)變形主要由圍巖塑性流動(dòng)造成,而過(guò)一段時(shí)間后膨脹變形則開(kāi)始產(chǎn)生作用。隧道圍巖壓力同時(shí)包括圍巖塑性流動(dòng)和膨脹作用圍巖壓力。(3)在試驗(yàn)結(jié)果的基礎(chǔ)上利用巖土工程軟件FLAC3D對(duì)隧道施工進(jìn)行數(shù)值模擬,計(jì)算內(nèi)容包括實(shí)際施工中采用的三臺(tái)階法、CRD法、提高支護(hù)參數(shù)的CRD法和雙側(cè)壁導(dǎo)坑法。依據(jù)計(jì)算結(jié)果和實(shí)際監(jiān)控量測(cè)數(shù)據(jù),建議合理的支護(hù)參數(shù)和施工方法。
[Abstract]:The surrounding rock lithology of Guanyazi tunnel is poor, the weathering and rock fragmentation degree have no obvious regularity with mileage, a large number of weakly cemented minerals are mixed between the surrounding rock layers, the joints are developed, after excavation, there is basically no self-stability ability, and the strength of the surrounding rock decreases rapidly after exposure. The air has the characteristics of expansion and looseness, and the softening of water has obvious characteristics of continuous deformation of soft rock. Therefore, in order to ensure the safety of tunnel construction, the above problems are studied. The related research results can provide guidance for the tunnel construction, but also provide reference for similar tunnel design and construction. The main research work and results are as follows: (1) by observing the microstructure of the surrounding rock samples, the lithofacies of the rock samples is identified as sericite phyllite. The physical and hydrological properties of rock and the strength index of rock are tested by rock mechanical properties test. (2) according to the test data of rock mechanical properties obtained from field sampling, the large deformation mechanism of Guanyazi Tunnel is analyzed and found according to the field practice. The deformation in the short term after tunnel excavation is mainly caused by the plastic flow of surrounding rock, but after a period of time, the expansion deformation begins to play an important role. The surrounding rock pressure of tunnel includes plastic flow of surrounding rock and expansion of surrounding rock. (3) based on the test results, the numerical simulation of tunnel construction is carried out by using geotechnical engineering software FLAC3D. The CRD method and the double side wall guide pit method are used to improve the supporting parameters. Based on the calculated results and the actual monitoring data, reasonable support parameters and construction methods are suggested.
【學(xué)位授予單位】：石家莊鐵道大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U455.4

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