本文選題：巖溶隧道　切入點：概化模型　出處：《西南交通大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：近年來,我國交通運輸業(yè)的運營需求與日俱增,高速鐵路事業(yè)得以蓬勃發(fā)展,眾多的鐵路隧道在西南片區(qū)巖溶發(fā)育的地層中修建,巖溶地質(zhì)災(zāi)害給隧道施工建設(shè)和運營維護帶來了艱巨的挑戰(zhàn)。鑒于巖溶發(fā)育的不確定性以及巖溶隧道的復(fù)雜性,目前對巖溶隧道的研究程度尚不足以滿足工程建設(shè)的需要。為此,本文以云桂鐵路長慶坡隧道大型巖溶為研究對象,建立了充填性巖溶隧道概化模型,利用FLAC3D計算軟件,研究充填性巖溶的邊界范圍對隧道基底在列車荷載作用下的沉降影響規(guī)律,并通過數(shù)據(jù)分析,得到基于敞開地基沉降計算的隧道基底沉降計算方法。論文的主要工作內(nèi)容如下:(1)查閱前人研究資料,就國內(nèi)外巖溶頂板安全厚度和穩(wěn)定性、巖溶大小和分布位置對隧道影響方面的研究現(xiàn)狀進行總結(jié)概括。(2)以云桂鐵路長慶坡隧道大型巖溶為研究背景,對巖溶與隧道的空間關(guān)系進行了分析,并概括為三種模型,最后在此基礎(chǔ)上建立巖溶隧道概化模型。(3)利用數(shù)值計算軟件建立巖溶隧道分析模型,分別研究了巖溶上下邊界和左右邊界范圍對隧底加載沉降的影響。結(jié)果表明,巖溶左右邊界影響范圍為2d(d為隧道直徑),下邊界的影響范圍為3d,上邊界的影響范圍為1.2d;巖溶位于隧道基底以下時,隧道底板安全厚度應(yīng)不小于5m;側(cè)部巖溶會導(dǎo)致隧道該側(cè)圍巖產(chǎn)生應(yīng)力集中,且隨著距離越近,應(yīng)力集中程度越大。(4)當巖溶存在于隧道平面有限范圍內(nèi)時,將巖溶的邊界參數(shù)進行整合,研究其綜合影響,并分別命名為上下軸。最終模擬結(jié)果表明,上軸的最大影響范圍為1.6d,最小影響范圍為-0.5d;下軸的最小影響范圍為-3.1d。當巖溶底邊界超過基底面時,巖溶對隧道基底加載影響較小,但隧道圍巖受巖溶影響不可忽略。(5)基于數(shù)值模擬計算結(jié)果,采用1stOpt數(shù)據(jù)擬合軟件,建立了考慮巖溶邊界影響的巖溶隧道地基沉降理論計算方法,并運用圖形化編程軟件Lab VIEW實現(xiàn)了計算流程的界面化和程序化。針對某具體巖溶隧道實例,運用本文設(shè)計的基底沉降計算程序,與實例中隧道基底沉降計算值進行對比分析,驗證了所提方法的合理性。
[Abstract]:In recent years, China's transportation industry is the operational requirements of high-speed railway enterprises to grow with each passing day, the vigorous development of railway tunnel construction, many of the development in the southwest area of karst formation, brought huge challenge to the karst geological disaster of tunnel construction and operation and maintenance. In view of the uncertainty of karst development and the complexity of karst tunnel. The present study degree of karst tunnel is still not enough to meet the needs of engineering construction. Therefore, based on the cloud Guangxi railway Changqing large karst Slope Tunnel as the research object, the establishment of the filling karst tunnel conceptual model, using the FLAC3D calculation software, the filling karst boundary of tunnel foundation under train loads settlement influence, and through data analysis, get the open foundation settlement of tunnel base settlement calculation method based on the main contents of this paper are as follows: (1) Review of previous studies, both at home and abroad and the safe thickness of karst roof stability of karst, the size distribution and the position of the research summarized the tunnel effect. (2) to cloud Guangxi railway Changqing large karst Slope Tunnel as the research background, the spatial relationship of karst tunnel are analyzed, which are summarized as three kinds of models finally, on the basis of the establishment of karst tunnel model. (3) establish the calculation software of karst tunnel by numerical analysis model, the effect of loading on the karst border of the tunnel bottom settlement were studied. The results indicate that the karst boundary influence range is 2D (D is the diameter of the tunnel), influence scope under the boundary of 3D, affecting range boundary is 1.2D; karst tunnel is located in the basement below, the safe thickness of the tunnel floor should be not less than 5m; the side of karst will lead to the stress concentration generated in the tunnel wall rock, and With the closer the stress concentration is greater. (4) when the karst tunnel in finite range, the boundary parameters of karst integration, a comprehensive study of its effects, and were named as the upper and lower shaft. Finally the simulation results show that the maximum impact range of shaft is 1.6d, the minimum range of influence -0.5d; minimum impact range is -3.1d. when the shaft bottom boundary than the basal surface of karst, karst tunnel loading has little effect on the substrate, but controlled by karst tunnel surrounding rock can not be ignored. (5) the results of numerical calculation based on data fitting using 1stOpt software, establish karst tunnel karst foundation considering the influence of boundary settlement the theoretical calculation method, and the calculation process of the interface and programs using graphical programming software Lab VIEW. According to the karst tunnel as an example, the use of the design of the basement settlement calculation procedures and examples in The calculation of the settlement of the channel base has been compared and analyzed to verify the reasonableness of the proposed method.

【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U451

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