本文選題：TBM輸水隧洞　切入點：襯砌管片　出處：《天津大學(xué)》2014年碩士論文

【摘要】：TBM掘進(jìn)技術(shù)憑借其機(jī)械化程度高、施工速度快、對外界干擾性小、掘進(jìn)作業(yè)安全等優(yōu)點成為長距離深埋輸水隧洞開挖施工的首要選擇。目前TBM隧洞穩(wěn)定性分析中大多或是不予考慮外水壓力,或是采用“水-巖分算”的方法將外水壓力簡化為面力施加于襯砌結(jié)構(gòu)的邊界,并且TBM隧洞工程的分析中多將襯砌簡化為均質(zhì)滲透體,未能考慮到TBM隧洞工程中滲水主要發(fā)生在管片接縫等局部區(qū)域。此外,大多隧洞工程研究中采用的地質(zhì)模型都進(jìn)行了不同程度的簡化,多將地質(zhì)體簡化均質(zhì)體。針對目前研究中的一些不足之處,結(jié)合某TBM輸水隧洞工程實例,開展了耦合滲流場的TBM輸水隧洞三維有限元分析,在總結(jié)現(xiàn)有研究成果的基礎(chǔ)上,取得了如下研究成果:(1)針對目前大多關(guān)于隧洞工程的研究中將隧洞圍巖簡化成均質(zhì)體的不足,構(gòu)建隧洞圍巖三維地質(zhì)模型。從工程地質(zhì)建模數(shù)據(jù)結(jié)構(gòu)、地質(zhì)體建模技術(shù)等方面進(jìn)行地質(zhì)建模理論的介紹,并在該理論的基礎(chǔ)上采用Visual Geo系統(tǒng),結(jié)合工程實例,構(gòu)建TBM輸水隧洞圍巖三維地質(zhì)模型,為TBM輸水隧洞圍巖滲流場數(shù)值模擬和隧洞穩(wěn)定性分析提供更加符合工程實際的地質(zhì)模型。(2)結(jié)合TBM輸水隧洞的工程特點,實現(xiàn)隧洞管片接縫滲水的滲流場的模擬,并將水荷載以體積力的形式作用在結(jié)構(gòu)分析中。基于隧洞圍巖三維地質(zhì)模型,針對深埋TBM輸水隧洞在較大外水壓力下容易在襯砌管片接縫處滲水的工程特點,利用自編的腳本文件解決耦合分析模型中滲流場與應(yīng)力場兩套非匹配網(wǎng)格之間的數(shù)據(jù)傳遞問題,將考慮滲水發(fā)生在管片接縫位置的滲流場中的地下水壓力以體積力的形式耦合至TBM輸水隧洞的穩(wěn)定性分析模型中。在三維結(jié)構(gòu)計算結(jié)果中,利用應(yīng)力路徑積分方法得到管片襯砌的軸力、彎矩的分布情況。(3)引進(jìn)基于正交試驗設(shè)計的敏感性分析方法,分析隧洞圍巖參數(shù)對于隧洞穩(wěn)定性評價指標(biāo)的敏感性大小。將基于正交試驗設(shè)計的敏感性分析方法引入隧洞滲流應(yīng)力耦合分析模型,采用三維有限元分析方法計算各個因素不同取值時的隧洞襯砌最大主應(yīng)力、最小主應(yīng)力、最大徑向位移三個隧洞穩(wěn)定性的評價指標(biāo)。利用極差分析方法分析了隧洞穩(wěn)定性評價指標(biāo)對6個圍巖參數(shù)的敏感性,為類似工程的設(shè)計提供指導(dǎo)。
[Abstract]:With the advantages of high mechanization, fast construction speed, little interference to the outside world and safety of tunneling operation, TBM tunneling technology has become the first choice in the excavation of long distance and deep buried water conveyance tunnel.At present, in the stability analysis of TBM tunnel, either the external water pressure is not considered, or the external water pressure is simplified to the boundary of the lining structure by the method of "water-rock separation".In the analysis of TBM tunnel, the lining is simplified to homogeneous permeability, which fails to take into account that the seepage occurs mainly in the segment joint and other local areas in the TBM tunnel project.In addition, most of the geological models used in tunnel engineering research have been simplified to varying degrees, and the geological bodies are mostly simplified as homogeneous bodies.In view of the shortcomings of the present research, combined with an example of a TBM water conveyance tunnel, the three-dimensional finite element analysis of the coupled seepage field of the TBM water conveyance tunnel is carried out. On the basis of summing up the existing research results, the three dimensional finite element analysis of the coupled seepage field is carried out.The following research results have been obtained: (1) aiming at the deficiency of most of the current researches on tunnel engineering to simplify the surrounding rock of tunnel into homogeneous mass, a three-dimensional geological model of surrounding rock of tunnel is constructed.This paper introduces the geological modeling theory from the aspects of engineering geological modeling data structure, geological body modeling technology and so on. On the basis of this theory, a three-dimensional geological model of surrounding rock of TBM water conveyance tunnel is constructed by using Visual Geo system and engineering examples.For the numerical simulation of surrounding rock seepage field of TBM water conveyance tunnel and the analysis of tunnel stability, a more practical geological model is provided. Combining with the engineering characteristics of TBM water conveyance tunnel, the seepage field of tunnel pipe joint seepage can be simulated.And the water load acts in the form of volume force in the structure analysis.Based on the 3D geological model of tunnel surrounding rock, this paper aims at the engineering characteristics of deep buried TBM water conveyance tunnel which is easy to seep water at the joint of lining pipe under large external water pressure.The self-compiled script file is used to solve the data transfer problem between two sets of mismatched meshes in the coupled analysis model.The groundwater pressure in the seepage field where seepage occurs at the joint position of the pipe piece is coupled to the stability analysis model of the TBM water conveyance tunnel in the form of volume force.In the result of 3D structure calculation, the stress path integral method is used to obtain the axial force and the distribution of bending moment of segment lining. (3) the sensitivity analysis method based on orthogonal test design is introduced.The sensitivity of surrounding rock parameters to the evaluation index of tunnel stability is analyzed.The sensitivity analysis method based on orthogonal test design is introduced into the seepage stress coupling analysis model of tunnel, and the maximum principal stress and minimum principal stress of tunnel lining are calculated by using three-dimensional finite element analysis method with different values of each factor.Evaluation index of stability of three tunnels with maximum radial displacement.The sensitivity of tunnel stability evaluation index to six surrounding rock parameters is analyzed by means of range analysis method, which provides guidance for the design of similar projects.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TV554;TV223

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