本文選題：深埋隧道　切入點(diǎn)：高地應(yīng)力　出處：《長沙理工大學(xué)》2014年碩士論文

【摘要】：隨著我國隧道建設(shè)向著“長、大、深、群”方向發(fā)展,深埋硬巖隧道在硬性結(jié)構(gòu)面控制下的穩(wěn)定性問題日益受到重視。本文以有限元軟件Midas/GTS為分析工具,將深埋硬巖隧洞在結(jié)構(gòu)面控制下的開挖簡化為平面應(yīng)變問題,對(duì)結(jié)構(gòu)面自身特性對(duì)深埋硬巖隧道穩(wěn)定性影響,不同巖性條件、不同高地應(yīng)力下結(jié)構(gòu)面對(duì)深埋硬性隧道穩(wěn)定性影響,以及在自重應(yīng)力下結(jié)構(gòu)面的尺寸效應(yīng)做了較全面的模擬試驗(yàn),并定量地分析了不同情況下硬性結(jié)構(gòu)面對(duì)隧道各部位圍巖變形、塑性區(qū)的影響效果,對(duì)相關(guān)工程人員的實(shí)踐有一定的參考價(jià)值。本文的主要成果：(1)以圍巖變形為主要指標(biāo),確定了硬性結(jié)構(gòu)面對(duì)深埋硬巖隧道的最大影響距離和有效影響距離,以及結(jié)構(gòu)面特性變化時(shí)對(duì)隧道圍巖變形的影響；(2)分析了巖性變化時(shí)結(jié)構(gòu)面對(duì)隧道穩(wěn)定性的影響,表明好的巖性有助于降低結(jié)構(gòu)面的不利影響；反之,差的巖性會(huì)使結(jié)構(gòu)面的不利影響增強(qiáng)；并單獨(dú)分析了巖性參數(shù),發(fā)現(xiàn)巖體抗拉強(qiáng)度基本無影響,而彈性模量、內(nèi)摩擦角、粘聚力以各自方式影響著結(jié)構(gòu)面的作用；(3)分析了不同高地應(yīng)力形式下結(jié)構(gòu)面的影響作用,表明結(jié)構(gòu)面在側(cè)壓系數(shù)增加或自重應(yīng)力增加時(shí),均加劇了隧道的不穩(wěn)定性；(4)確定了小尺寸結(jié)構(gòu)面在傾角和距離一定時(shí)的最不利分布；提出最大有效影響尺寸的概念；分析了結(jié)構(gòu)面在高地應(yīng)力硬巖條件下的尺寸效應(yīng),得出在結(jié)構(gòu)面有效影響距離內(nèi)的最大有效影響尺寸與傾角、距離的關(guān)系式,并通過曲線擬合得到了傾角為0。、45。、90。結(jié)構(gòu)面距隧洞1m時(shí)的尺寸效應(yīng)公式。
[Abstract]:With the development of tunnel construction in our country towards the direction of "long, large, deep and group", the stability of the tunnel under the control of hard structure surface has been paid more and more attention.In this paper, the finite element software Midas/GTS is used to simplify the excavation of deep buried hard rock tunnel under the control of structural plane as a plane strain problem, which affects the stability of deep buried hard rock tunnel on its own characteristics and different lithologic conditions.In this paper, the effects of different ground stresses on the stability of deep buried hard tunnel and the size effect of structural plane under gravity stress are simulated.The effect of hard structure on the deformation of surrounding rock and plastic zone of tunnel under different conditions is analyzed quantitatively, which has some reference value for the practice of relevant engineers.Taking the deformation of surrounding rock as the main index, the maximum influence distance and effective influence distance of hard structure facing deep hard rock tunnel are determined.And the influence on the deformation of tunnel surrounding rock when the characteristic of structure plane changes.) the influence of structure on tunnel stability when lithology changes is analyzed, which shows that good lithology is helpful to reduce the adverse effect of structural plane.The bad lithology will enhance the adverse effect of the structural plane, and the lithologic parameters are analyzed separately, and it is found that the tensile strength of rock mass has no effect on it, while the elastic modulus, the angle of internal friction,The effect of cohesive force on the structure plane is analyzed in different high ground stress forms. It is shown that the structure plane is affected by the lateral pressure coefficient or the self-gravity stress when the lateral pressure coefficient is increased or the weight stress is increased.The most unfavorable distribution of the small structural plane at certain inclination angle and distance is determined, the concept of maximum effective influence size is put forward, and the size effect of the structural plane under the condition of high ground stress hard rock is analyzed.The relationship between the maximum effective influence dimension and the angle of inclination and distance within the effective influence distance of the structure plane is obtained, and the inclination angle is 0.45.90 by curve fitting.The size effect formula of the tunnel with a distance of 1 m from the structure surface.
【學(xué)位授予單位】：長沙理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U455

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相關(guān)期刊論文 前1條

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本文編號(hào)：1705101