本文選題：偏壓隧道 + 初始應(yīng)力場(chǎng)　； 參考：《西南石油大學(xué)》2014年碩士論文

【摘要】：考慮山嶺隧道的偏壓效應(yīng)和地下滲流對(duì)圍巖失穩(wěn)的影響,在圍巖開挖擾動(dòng)區(qū)引入損傷變量來評(píng)價(jià)隧道的安全及穩(wěn)定性。 在前人大量研究成果上,總結(jié)了初始地應(yīng)力場(chǎng)成因、分布特點(diǎn)以及其在隧道工程中的重要性。首先結(jié)合現(xiàn)場(chǎng)實(shí)際情況對(duì)隧道偏壓的成因進(jìn)行了研究分析,并詳細(xì)給出了偏壓隧道設(shè)計(jì)采用的兩種計(jì)算方法。通過一組簡單數(shù)值模擬試驗(yàn),驗(yàn)證了地應(yīng)力平衡在隧道工程中的重要性,以及在有限元軟件ABAQUS/CAE實(shí)現(xiàn)地應(yīng)力平衡的幾種方法。 考慮滲流對(duì)巖體的影響作用后,在前人的工作基礎(chǔ)上引入巖石壓縮系數(shù)Cf、液體彈性壓縮系數(shù)CL,基于多孔介質(zhì)達(dá)西定律推導(dǎo)出巖體介質(zhì)單相滲流連續(xù)性方程新的形式；基于虛功原理和孔隙介質(zhì)有效應(yīng)力原理,推導(dǎo)出變形場(chǎng)的應(yīng)力平衡方程。最終通過引入孔隙水壓力對(duì)時(shí)間的導(dǎo)數(shù)作為兩方程的共同自變量實(shí)現(xiàn)滲流與應(yīng)力方程的耦合�；谟邢拊浖嗀BAQUS/CAE,分別對(duì)偏壓隧道與等效不偏壓隧道在考慮滲流作用與不考慮流-固耦合效應(yīng)進(jìn)行了多組數(shù)值仿真試驗(yàn)。主要對(duì)模擬結(jié)果中的地表位移、混凝土襯砌拱圈受力形態(tài)以及開挖擾動(dòng)區(qū)圍巖塑性區(qū)域分布進(jìn)行了對(duì)比分析,確定了滲流和偏壓效應(yīng)對(duì)圍巖力學(xué)性質(zhì)的影響程度。 根據(jù)連續(xù)損傷力學(xué)理論,在前人提出的彈塑性損傷模型中進(jìn)一步采用了與塑性應(yīng)變相關(guān)的標(biāo)量損傷,并將該損傷變量應(yīng)用到摩爾-庫倫屈服準(zhǔn)則中。在考慮滲流與應(yīng)力場(chǎng)的耦合作用下,參照前人的圍巖損傷過程中滲透系數(shù)演化規(guī)律,分別建立了圍巖彈塑性損傷理論模型及相應(yīng)的有限元數(shù)值模型。 以青藏鐵路西格二線-新關(guān)角隧道的工程資料作為源數(shù)據(jù)來源,基于有限元軟件ABAQUS/CAE平臺(tái),通過fortran語言編寫子程序USDFLD實(shí)現(xiàn)損傷變量的定義及其與塑性應(yīng)變的耦合,對(duì)滲流影響下的偏壓隧道進(jìn)行數(shù)值仿真。根據(jù)模擬結(jié)果,分析偏壓隧道開挖過程中應(yīng)力、孔隙壓力等特性的變化規(guī)律,得出了開挖擾動(dòng)區(qū)圍巖損傷演化規(guī)律。通過對(duì)比傳統(tǒng)的僅采用塑性區(qū)域表征巖體失效方法,得出用損傷變量來評(píng)價(jià)圍巖可靠性的優(yōu)越性和合理性。
[Abstract]:Considering the bias effect of mountain tunnel and the influence of underground seepage on the instability of surrounding rock the damage variable is introduced to evaluate the safety and stability of tunnel in the disturbed area of surrounding rock excavation. In this paper, the origin, distribution and importance of initial in-situ stress field in tunnel engineering are summarized. In this paper, the causes of the bias voltage of the tunnel are studied and analyzed according to the actual situation in the field, and two calculation methods for the design of the bias tunnel are given in detail. The importance of in-situ stress balance in tunnel engineering is verified by a set of simple numerical simulation tests, and several methods to realize in-situ stress balance in finite element software ABAQUS/CAE are verified. Considering the influence of seepage on rock mass, the rock compression coefficient Cf and the elastic compressibility coefficient of liquid are introduced on the basis of previous work, and a new form of continuity equation for single-phase seepage in rock mass media is derived based on Darcy's law of porous media. Based on the principle of virtual work and the principle of effective stress in porous media, the stress balance equation of deformation field is derived. Finally, the coupling of seepage and stress equation is realized by introducing the derivative of pore water pressure to time as the common independent variable of the two equations. Based on the finite element software Abaqus / CAE, the numerical simulation experiments were carried out for the bias tunnel and the equivalent unbiased tunnel considering the seepage effect and the fluid-solid coupling effect respectively. In this paper, the surface displacement, the force form of concrete lining arch ring and the plastic zone distribution of surrounding rock in the disturbed area of excavation are compared and analyzed, and the influence of seepage and eccentric pressure on the mechanical properties of surrounding rock is determined. According to the theory of continuous damage mechanics, the scalar damage related to plastic strain is further adopted in the elastoplastic damage model proposed by the predecessors, and the damage variable is applied to the Moorl-Coulomb yield criterion. Considering the coupling of seepage and stress field, the elastic-plastic damage theory model of surrounding rock and the corresponding finite element numerical model are established according to the evolution law of permeability coefficient in the damage process of surrounding rock. Based on the engineering data of Sieger-Xinguanjiao Tunnel of Qinghai-Tibet Railway, and based on the finite element software ABAQUS/CAE platform, the definition of damage variable and its coupling with plastic strain are realized by the subprogram USDFLD written in fortran language. Numerical simulation of the bias tunnel under the influence of seepage is carried out. According to the simulation results, the variation law of stress and pore pressure during the excavation of bias pressure tunnel is analyzed, and the law of damage evolution of surrounding rock in disturbed area of excavation is obtained. By comparing the traditional method of using plastic region to characterize the failure of rock mass, the superiority and rationality of using damage variable to evaluate the reliability of surrounding rock are obtained.
【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U451.2

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 馬士偉;梅志榮;張軍偉;杜俊;;巖溶隧道涌突水災(zāi)害預(yù)警與防治技術(shù)[J];山東大學(xué)學(xué)報(bào)(工學(xué)版);2009年04期

2 黃存捍;馮濤;謝雄剛;;軟巖滲流規(guī)律研究進(jìn)展[J];水利水電科技進(jìn)展;2008年05期

3 沈珠江;;軟土地基固結(jié)變形計(jì)算程序[J];水利水運(yùn)科技情報(bào);1975年Z1期

4 張有天,胡惠昌;地應(yīng)力場(chǎng)的趨勢(shì)分析[J];水利學(xué)報(bào);1984年04期

5 王恩志,孫役,黃遠(yuǎn)智,王慧明;三維離散裂隙網(wǎng)絡(luò)滲流模型與實(shí)驗(yàn)?zāi)M[J];水利學(xué)報(bào);2002年05期

6 薛新華;張我華;;多孔介質(zhì)巖土材料的Biot固結(jié)損傷有限元分析[J];水利學(xué)報(bào);2009年02期

7 王媛,徐志英,速寶玉;裂隙巖體滲流與應(yīng)力耦合分析的四自由度全耦合法[J];水利學(xué)報(bào);1998年07期

8 姚寶魁 ,張承娟;高地應(yīng)力壩區(qū)硐室圍巖巖爆及其斷裂破壞機(jī)制[J];水文地質(zhì)工程地質(zhì);1985年06期

9 吳傳斌,施斌,孫宇,趙永貴;昆明白泥井3號(hào)隧道圍巖穩(wěn)定性FLAC~(3D)模擬[J];水文地質(zhì)工程地質(zhì);2004年06期

10 朱珍德,孫鈞;裂隙巖體非穩(wěn)態(tài)滲流場(chǎng)與損傷場(chǎng)耦合分析模型[J];水文地質(zhì)工程地質(zhì);1999年02期

，

本文編號(hào)：1781820