本文關(guān)鍵詞：鐵路隧道圍巖蠕變對TBM圓形襯砌力學(xué)特性的影響研究　出處：《西南交通大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 圍巖蠕變 蠕變分析 地質(zhì)體三維地形 應(yīng)力場反演

【摘要】：近年來,隨著基礎(chǔ)設(shè)施建設(shè)重心逐步西移,眾多連接西部與東、中部地區(qū)的鐵路公路提上日程,涌現(xiàn)出大量埋深較大、存在高地應(yīng)力的長大隧道工程。在高地應(yīng)力作用下,圍巖往往發(fā)生蠕變現(xiàn)象,給結(jié)構(gòu)安全營運造成影響。因此,有必要對基于均質(zhì)圓環(huán)模型的盾構(gòu)隧道蠕變分析方法、地質(zhì)體地形三維建模、構(gòu)造應(yīng)力場三維反演方法、構(gòu)造應(yīng)力場下隧道圍巖蠕變特性等開展研究。有鑒于此,本文結(jié)合中國鐵路總公司科技研究開發(fā)計劃課題,研究了圍巖蠕變作用下TBM法鐵路隧道的結(jié)構(gòu)力學(xué)特性。主要研究工作如下:1、基于Burgers蠕變模型,分別給出了毛洞和襯砌支護條件下隧道蠕變的位移解析解。針對高黎貢山隧道,分析了不同掌子面影響系數(shù)下隧道圍巖的蠕變特性。2、基于均質(zhì)圓環(huán)模型、考慮Burgers蠕變荷載,分別采用荷載結(jié)構(gòu)模型和地層結(jié)構(gòu)模型,對圓形隧道進行了蠕變力學(xué)特性分析,對比了兩種分析方法的優(yōu)缺點。3、基于梁彈簧地層結(jié)構(gòu)模型,考慮管片襯砌接頭非線性特性,分析了高黎貢山隧道在圍巖蠕變條件下的力學(xué)特性。4、利用多元回歸分析原理,基于地質(zhì)體地形三維建模,考慮自重應(yīng)力場、水平擠壓應(yīng)力場、水平剪切應(yīng)力場以及豎直剪切應(yīng)力場等工況的回歸分析方法,獲得了初始構(gòu)造應(yīng)力場的線性回歸方程。5、在地質(zhì)體地形三維模型條件下,分析了構(gòu)造應(yīng)力條件下圍巖蠕變對隧道襯砌結(jié)構(gòu)位移的影響規(guī)律。
[Abstract]:In recent years, with the gradual shift of the center of gravity of infrastructure construction to the west, a large number of railway highways connecting the west to the east and the middle of the region have been put on the agenda, and a large number of buried depth have emerged. There is a large tunnel project with high ground stress. Under the action of high ground stress, the creep phenomenon often occurs in surrounding rock, which affects the safe operation of the structure. It is necessary to analyze the creep of shield tunnel based on homogeneous ring model, to model the terrain of geological body and to invert the stress field. The creep characteristics of tunnel surrounding rock under tectonic stress field were studied. In view of this, this paper combined with the China Railway Corporation scientific and technological research and development project. The structural mechanical properties of TBM railway tunnel under the action of surrounding rock creep are studied. The main research work is as follows: 1, based on Burgers creep model. The displacement analytical solution of tunnel creep under the condition of Mao cave and lining support is given respectively. For Gaoligongshan tunnel, the creep characteristics of surrounding rock of the tunnel under the influence coefficient of different face face are analyzed. 2, based on the homogeneous ring model. Considering Burgers creep load, the creep mechanical properties of circular tunnel are analyzed by using load structure model and stratum structure model respectively, and the advantages and disadvantages of the two analysis methods are compared. Based on the beam spring stratum structure model and considering the nonlinear characteristics of segment lining joint, the mechanical properties of Goligongshan tunnel under the creep condition of surrounding rock are analyzed. 4. The principle of multivariate regression analysis is used. Based on the 3D modeling of geological body, the regression analysis method of gravity stress field, horizontal extrusion stress field, horizontal shear stress field and vertical shear stress field is considered. The linear regression equation of initial tectonic stress field. 5. Under the condition of 3D model of geological body topography, the influence of surrounding rock creep on the displacement of tunnel lining structure under the condition of tectonic stress is analyzed.
【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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