發(fā)布時間：2018-07-28 10:22

【摘要】：深埋長大隧道埋深大、距離長,施工周期長、成本高,多經(jīng)過地形復(fù)雜區(qū)域、施工困難,不可避免地會碰到一系列如塌方、巖爆、圍巖大變形等工程地質(zhì)災(zāi)害問題。因此,對這些深埋隧道工程施工中常見的主要地質(zhì)災(zāi)害問題及對應(yīng)措施進行分析研究具有重要意義。以榮烏高速公路營爾嶺隧道為實際工程背景,通過地質(zhì)資料及現(xiàn)場勘察,對隧址區(qū)工程地質(zhì)情況做了初步分析。結(jié)合工程實例,采用Midas GTS NX有限元分析軟件對深埋隧道軟弱圍巖管棚處理效果做了深入研究,對預(yù)開挖段隧道圍巖做了巖爆和大變形的預(yù)測研究。主要內(nèi)容如下:(1)模擬了不同厚度的注漿加固區(qū),隧道圍巖的應(yīng)力場、變形場及塑性區(qū)分布特征情況,定量分析了管棚注漿加固法對隧道圍巖的加固效果。得出注漿加固區(qū)并不是厚度越大越好,綜合施工安全和經(jīng)濟合理等方面因素,厚度取5m是較為合理的。(2)對深埋隧道軟弱圍巖管棚加固段的施工過程進行數(shù)值模擬。通過模擬,重點分析了開挖后隧道圍巖的受力及變形特征,并對不同預(yù)支護條件下隧道開挖掌子面的穩(wěn)定性進行了評價。分析得出管棚的注漿加固效果在對隧道附近圍巖應(yīng)力重分布和控制圍巖的收斂變形方面起到了決定性作用,而管棚的梁效應(yīng)則能有效控制開挖掌子面的拱頂沉降和縱向鼓出,對開挖面的穩(wěn)定性起到了關(guān)鍵作用。(3)對不同埋深下的圍巖進行數(shù)值模擬,預(yù)測發(fā)生巖爆或者大變形的可能性。通過研究隧道附近圍巖的應(yīng)力特征并結(jié)合巖爆的判定依據(jù),得出營爾嶺隧道有發(fā)生巖爆的可能性,輕微巖爆區(qū)約占隧道總長的38%,中等巖爆區(qū)約占7%,埋深在200m以上的堅硬完整圍巖會發(fā)生輕微巖爆甚至中等巖爆,主要危險區(qū)位于拱腳及邊墻部位;通過研究隧道的變形特征并結(jié)合圍巖大變形的判定依據(jù),得出營爾嶺隧道埋深在600m以上的軟弱破碎圍巖會發(fā)生大變形,程度為輕度。
[Abstract]:The deep buried long tunnel is very deep, long distance, long construction period, high cost, passing through the complicated terrain area, and the construction is difficult, so it will inevitably encounter a series of engineering geological disasters such as collapse, rockburst, large deformation of surrounding rock and so on. Therefore, it is of great significance to analyze and study the main geological hazards and corresponding measures in the construction of these deep buried tunnels. Taking Yingerling Tunnel of Rongwu Expressway as the actual engineering background, through geological data and on-the-spot investigation, this paper makes a preliminary analysis of the engineering geological situation in the tunnel site area. Combined with engineering examples, the treatment effect of soft surrounding rock pipe shed in deep buried tunnel is deeply studied by using Midas GTS NX finite element analysis software, and the prediction of rockburst and large deformation of tunnel surrounding rock in pre-excavated section is studied. The main contents are as follows: (1) the stress field, deformation field and plastic zone distribution characteristics of different thickness grouting reinforcement zone, tunnel surrounding rock are simulated, and the effect of pipe shed grouting reinforcement method on tunnel surrounding rock is quantitatively analyzed. It is concluded that the grouting reinforcement area is not the thicker the better, the safety and economy are reasonable, and the thickness of 5 m is reasonable. (2) numerical simulation of the construction process of the soft surrounding rock pipe shed reinforcement section of deep buried tunnel is carried out. Through simulation, the stress and deformation characteristics of tunnel surrounding rock after excavation are analyzed, and the stability of tunnel excavation face under different pre-supporting conditions is evaluated. It is concluded that the grouting reinforcement effect of pipe shed plays a decisive role in stress redistribution and control of convergence and deformation of surrounding rock near tunnel, while beam effect of pipe shed can effectively control the settlement of arch roof and longitudinal bulging of excavation face. It plays a key role in the stability of excavated surface. (3) numerical simulation of surrounding rock with different buried depth is carried out to predict the possibility of rock burst or large deformation. By studying the stress characteristics of surrounding rock around the tunnel and combining with the judging basis of rock burst, the possibility of rock burst in Yingerling tunnel is obtained. The minor rockburst area accounts for about 38 of the total length of the tunnel, and the moderate rockburst area accounts for about 7. The rock burst or moderate rockburst will occur in the hard and intact surrounding rock with a depth of more than 200 m. The main danger area is located at the arch foot and the side wall. By studying the deformation characteristics of the tunnel and judging the large deformation of surrounding rock, it is concluded that the weak and broken surrounding rock with buried depth above 600m in Yingerling tunnel will undergo large deformation, and the degree is mild.
【學位授予單位】：煙臺大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U452.11

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