發(fā)布時(shí)間：2019-06-02 18:42

【摘要】：成貴線西南客運(yùn)專線鐵路,隧道開挖面積超過150m2。本線路穿越云貴川三省主要產(chǎn)煤地段,瓦斯隧道眾多,由煤層導(dǎo)致的隧道大變形狀況比較明顯。為了確保施工過程的安全,減少圍巖由于破壞所造成的巨大經(jīng)濟(jì)損失,運(yùn)用ABAQUS軟件,對隧道開挖進(jìn)行模擬,研究隧道在開挖過程中的穩(wěn)定性及受力情況。得出了不同開挖方式和支護(hù)設(shè)計(jì)對圍巖穩(wěn)定性的影響。通過開挖后圍巖應(yīng)力位移變化,得出合理的隧道開挖方式以及支護(hù)參數(shù),為施工提供更好的設(shè)計(jì)依據(jù),保證工程的安全進(jìn)行。 本文闡述了大變形圍巖的特征以及作用機(jī)理,對大變形圍巖的危害,提出了合理的防治措施。分析了錨桿支護(hù)對圍巖的作用特性,在圍巖的作用下,錨桿主要表現(xiàn)為抗拉彎,易產(chǎn)生塑性流動(dòng)。 本文研究了成貴客運(yùn)專線鐵路高坡隧道穿煤系地段,高坡隧道具有圍巖大變形等特點(diǎn)。運(yùn)用ABAQUS軟件,分析穿越煤層以及不同開挖方式對圍巖的影響,對開挖方法進(jìn)行總結(jié)分析,確定了合理的開挖方式。在開挖的同時(shí),改變穿煤隧道支護(hù)設(shè)計(jì)參數(shù),分析不同參數(shù)對開挖的影響,確定了合理的支護(hù)設(shè)計(jì)。 本文研究了成貴客運(yùn)專線鐵路玉京山富含煤層地段,玉京山隧道具有高瓦斯、大變形等特點(diǎn)。運(yùn)用ABAQUS軟件,分析不同開挖方式及支護(hù)設(shè)計(jì)對圍巖的影響,確定了合理的開挖方法。針對高壓力瓦斯,對瓦斯采取等效作用在襯砌上的壓力進(jìn)行模擬,研究瓦斯壓力對支護(hù)結(jié)構(gòu)穩(wěn)定性的影響。分析不同支護(hù)參數(shù)對圍巖的影響,優(yōu)化了支護(hù)設(shè)計(jì)。
[Abstract]:The excavation area of tunnel is more than 150m ~ 2 for the railway of southwest passenger dedicated line of Chenggui line. This line passes through the main coal-producing areas of Yungui Sichuan Province, and there are many gas tunnels, and the large deformation of the tunnel caused by coal seam is obvious. In order to ensure the safety of the construction process and reduce the huge economic loss caused by the failure of the surrounding rock, the tunnel excavation is simulated by using ABAQUS software, and the stability and force of the tunnel in the excavation process are studied. The effects of different excavation methods and support design on the stability of surrounding rock are obtained. Through the change of stress and displacement of surrounding rock after excavation, the reasonable excavation mode and support parameters of tunnel are obtained, which provides a better design basis for construction and ensures the safety of the project. This paper expounds the characteristics and action mechanism of large deformation surrounding rock, the harm to large deformation surrounding rock, and puts forward reasonable prevention and control measures. The action characteristics of bolt support on surrounding rock are analyzed. under the action of surrounding rock, bolt is mainly anti-tension and bending, which is easy to produce plastic flow. In this paper, the coal measures section of Chenggui passenger dedicated line railway high slope tunnel is studied. The high slope tunnel has the characteristics of large deformation of surrounding rock and so on. By using ABAQUS software, the influence of crossing coal seam and different excavation methods on surrounding rock is analyzed, the excavation method is summarized and analyzed, and the reasonable excavation method is determined. At the same time, the support design parameters of coal-piercing tunnel are changed, the influence of different parameters on excavation is analyzed, and the reasonable support design is determined. In this paper, the area rich in coal seam in Yujingshan, Chenggui passenger dedicated line railway, is studied. Yujingshan tunnel has the characteristics of high gas and large deformation. Using ABAQUS software, the influence of different excavation methods and support design on surrounding rock is analyzed, and the reasonable excavation method is determined. Aiming at high pressure gas, the equivalent pressure of gas on lining is simulated, and the influence of gas pressure on the stability of supporting structure is studied. The influence of different supporting parameters on surrounding rock is analyzed, and the support design is optimized.
【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】：2014
【分類號】：U455

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本文編號：2491345