本文關(guān)鍵詞：金泉隧道Ⅳ級(jí)圍巖級(jí)別細(xì)分及其穩(wěn)定性控制研究　出處：《重慶大學(xué)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

  更多相關(guān)文章： 高速公路隧道 圍巖穩(wěn)定性 圍巖級(jí)別細(xì)分 監(jiān)控量測(cè) 數(shù)值模擬

【摘要】：圍巖穩(wěn)定性是隧道工程建設(shè)中的重要研究?jī)?nèi)容。對(duì)圍巖穩(wěn)定性的準(zhǔn)確認(rèn)識(shí),是巖體工程設(shè)計(jì)和制定施工方案、采取合理的工程處理措施以及保障施工安全的基礎(chǔ)。然而,由于地質(zhì)條件以及地下工程本身的復(fù)雜性、不可預(yù)見(jiàn)性以及勘察方法和手段的有限性,在其設(shè)計(jì)階段取得詳細(xì)地質(zhì)、圍巖參數(shù)和設(shè)計(jì)荷載參數(shù)等數(shù)據(jù)極其困難,設(shè)計(jì)階段的巖體分級(jí)往往與施工現(xiàn)場(chǎng)巖體的級(jí)別不符。因此,在隧道施工過(guò)程中,地質(zhì)工作者必須隨隧道施工過(guò)程,根據(jù)現(xiàn)場(chǎng)的地質(zhì)條件、超前地質(zhì)預(yù)報(bào)結(jié)果和監(jiān)控量測(cè)分析,對(duì)設(shè)計(jì)階段的圍巖分級(jí)和設(shè)計(jì)參數(shù)進(jìn)行修證,對(duì)施工方案進(jìn)行調(diào)整。本文結(jié)合金泉隧道工程實(shí)例進(jìn)行研究,研究?jī)?nèi)容和結(jié)論如下:①通過(guò)對(duì)現(xiàn)場(chǎng)地質(zhì)條件的觀察,發(fā)現(xiàn)金泉隧道洞身的進(jìn)口段與出口段圍巖巖性和巖層厚度有明顯的差異,在施工工程中所表現(xiàn)出穩(wěn)定性也有差別。故而通過(guò)現(xiàn)場(chǎng)觀察和現(xiàn)場(chǎng)TGP試驗(yàn),實(shí)驗(yàn)室?guī)r石物理力學(xué)實(shí)驗(yàn)等方法對(duì)其進(jìn)行圍巖級(jí)別細(xì)分,將洞身段圍巖分成Ⅳ1和Ⅳ2兩個(gè)亞級(jí)。②針對(duì)級(jí)別細(xì)分后的圍巖,調(diào)整原設(shè)計(jì)的施工方法和初期支護(hù)方案,設(shè)計(jì)另外兩種方案進(jìn)行研究。③應(yīng)用Flac3D對(duì)不同級(jí)別圍巖采用不同方案進(jìn)行模擬,通過(guò)分析應(yīng)力狀態(tài)、位移變化和塑性區(qū)情況來(lái)研究其穩(wěn)定性情況,研究結(jié)果表明:1)Ⅳ1級(jí)圍巖在原設(shè)計(jì)方案全斷面開(kāi)挖一次進(jìn)尺3m時(shí)具有一定的自穩(wěn)能力,采用原設(shè)計(jì)支護(hù)方案能有效限制圍巖變形。2)Ⅳ2級(jí)圍巖在全斷面一次開(kāi)挖3m時(shí),自穩(wěn)能力較差,在施作初期支護(hù)之前就常發(fā)生坍塌;當(dāng)開(kāi)挖進(jìn)尺減小到2m時(shí),坍塌現(xiàn)象有效地得到緩解,只有小范圍落石;當(dāng)采用臺(tái)階法時(shí),穩(wěn)定性進(jìn)一步得到加強(qiáng)。④現(xiàn)場(chǎng)進(jìn)行監(jiān)控量測(cè),分析位移變化規(guī)律,根據(jù)監(jiān)控量測(cè)結(jié)果的反饋,隧道采取調(diào)整后開(kāi)挖方式、支護(hù)方案后整體穩(wěn)定性較好。
[Abstract]:The stability of the surrounding rock is an important research content in the construction of tunnel engineering. To accurately understand the stability of the surrounding rock, rock engineering design and construction scheme, take reasonable engineering measures and guarantee the safety of construction of the foundation. However, because of the complexity of geological conditions and underground engineering itself, LIMITED unpredictability and investigation methods and means the detailed geology in the stage of design, extremely difficult rock and design load parameter data, rock mass classification design stage and construction site often does not match the rock level. Therefore, in the tunnel construction process, geological workers must follow the process of tunnel construction, according to the geological conditions of the site, measurement of geological prediction results and monitoring, the surrounding rock classification and design parameters for the design phase of the permit, to adjust the construction plan. The alloy spring Tunnel Engineering Case studies, research contents and conclusions are as follows: through the observation of field geological conditions, found that the Kimcheon tunnel entrance section and the exit section of the surrounding rock lithology and strata thickness have significant differences, in the construction project performance stability are different. So through on-site observation and TGP testing laboratory, physical and mechanical rock experiment was done on the rock level subdivision, will be divided into 1 rock cave figure IV and IV 2 and two sub classes. The rock level segments after the adjustment, the original design and construction method of the initial support scheme of two kinds of scheme design. The other application of Flac3D of different levels with different surrounding rock for simulating the stress state through the analysis, the displacement and the plastic zone to study its stability. The results show that: 1) IV 1 Rock in a full section excavation footage of the original design Has a certain self stability of 3M, the original supproting design can effectively restrict the deformation of the surrounding rock.2) IV 2 Rock in the full face excavation 3M, poor stability, as the initial support before the collapse often occur in Shi; when the excavation footage is reduced to 2m when the collapse phenomenon eased effectively, only a small range of rockfall; when using the step method, the stability is strengthened. The field monitoring measurement, analysis of the change regularity of displacement feedback, according to the monitoring results of the tunnel excavation method, take after adjustment, the supporting scheme after the whole stability is good.

【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：U452.12

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