本文關(guān)鍵詞： 充水溶洞 孕災(zāi)模式 數(shù)值計算 最小安全厚度 軟件設(shè)計 工程應(yīng)用　出處：《山東大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著隧道及地下工程的大量修建,巖溶災(zāi)害問題日益嚴(yán)重,其中溶洞突涌水一直是巖溶隧道建設(shè)過程中的最嚴(yán)重的地質(zhì)災(zāi)害之一,突涌水極易造成隧道工期延誤、器械報廢、人員傷亡。針對上述事實(shí),通過理論分析、數(shù)值計算和軟件設(shè)計手段對溶洞與隧道間最小安全厚度進(jìn)行研究,以期對隧道建設(shè)提供有利的應(yīng)用價值,主要內(nèi)容如下：(1)總結(jié)充水溶洞賦存規(guī)律及孕災(zāi)模式。通過對已有的相關(guān)文獻(xiàn)分析和總結(jié),歸納出充水溶洞的地質(zhì)賦存規(guī)律及充水性規(guī)律,初步分析了充水溶洞的孕災(zāi)模式,主要從涌水量與破壞通道兩方面進(jìn)行因素總結(jié),充水溶洞的破壞力往往離不開其涌水量及破壞通道的形成,基于充水溶洞的破壞方式,分別根據(jù)地質(zhì)前兆、力學(xué)前兆以及地球物理場前兆,歸納了孕災(zāi)性識別。(2)建立三維含充水溶洞隧道數(shù)值模型,初探溶洞與隧道間最小安全厚度判據(jù)。采用大型數(shù)值計算軟件Ansys10.0,建立了三維含球體充水溶洞的隧道數(shù)值模型,并設(shè)置一些列物理力學(xué)參數(shù),形成多級工況,利用FLAC3D軟件滲流模式進(jìn)行隧道開挖收斂計算,通過數(shù)值計算可以揭示隧道圍巖力學(xué)信息在充水溶洞的賦存情況下隨開挖的變化規(guī)律,同時也獲得溶洞與隧道間最小安全厚度的結(jié)論。(3)設(shè)計一款基于數(shù)值計算結(jié)果的最小安全厚度預(yù)測軟件系統(tǒng)。利用Microsoft Visual C++平臺設(shè)計了一款集最小安全厚度預(yù)測與突涌水災(zāi)害預(yù)警軟件系統(tǒng),基于數(shù)值計算結(jié)果,通過一元回歸和多元回歸建立了溶洞與隧道間最小安全厚度預(yù)測數(shù)學(xué)模型,其中圍巖級別因素設(shè)計有專門的評價模塊,圍巖級別是通過層次分析法以及專家打分原則進(jìn)行的,綜合考慮了主觀性和客觀性,使用兩個工程案例對軟件系統(tǒng)進(jìn)行了驗(yàn)證,其結(jié)果與現(xiàn)場開挖具有較高的一致性。
[Abstract]:With the construction of tunnel and underground engineering, the karst disaster is becoming more and more serious, among which, the karst cave water gushing is one of the most serious geological disasters in the construction process of karst tunnel. The sudden water gushing easily causes the tunnel construction period to be delayed and the equipment to be scrapped. According to the above facts, through theoretical analysis, numerical calculation and software design, the minimum safe thickness between cavern and tunnel is studied in order to provide beneficial application value for tunnel construction. The main contents are as follows: (1) summing up the occurrence law and disaster prevention model of water-filled karst cave. Through the analysis and summary of the relevant documents, the geological occurrence law and water-filling law of water-filled karst cave are summarized, and the disaster prevention mode of water-filled karst cave is analyzed preliminarily. The main factors are summarized from two aspects of water inflow and damage channel. The destructive power of water-filled karst cave is often inseparable from its water inflow and the formation of damage passage. Based on the failure mode of water-filled karst cave and the geological precursor respectively, The mechanical precursor and geophysical field precursor are summed up to identify the disaster preparedness. (2) A three-dimensional numerical model of water-filled cavern tunnel is established. This paper deals with the criterion of minimum safe thickness between caverns and tunnels. A numerical model of a three-dimensional tunnel with spherical water-filled caverns is established by using the large-scale numerical calculation software Ansys 10.0, and some physical and mechanical parameters are set up to form multistage working conditions. The convergence calculation of tunnel excavation is carried out by using FLAC3D software seepage model. Through numerical calculation, the variation law of mechanical information of surrounding rock with excavation can be revealed under the condition of the existence of water-filled caverns. At the same time, the conclusion of minimum safe thickness between cave and tunnel is obtained. (3) A software system for predicting minimum safe thickness based on numerical calculation results is designed. A set of minimum safe thickness prediction and burst is designed by using Microsoft Visual C platform. Water gushing disaster early warning software system, Based on the results of numerical calculation, a mathematical model for predicting the minimum safe thickness of caverns and tunnels is established by univariate regression and multivariate regression, in which the design of surrounding rock grade factors has a special evaluation module. The grade of surrounding rock is carried out by AHP and expert scoring principle. Considering subjectivity and objectivity, the software system is verified by two engineering cases, and the results are in good agreement with the excavation on site.
【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U453.61

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本文編號：1497857