本文關(guān)鍵詞：高地應(yīng)力擠壓性地層雙護盾TBM管片結(jié)構(gòu)設(shè)計方法研究　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： 雙護盾TBM 管片 擠壓性地層 形變壓力 管片接頭 結(jié)構(gòu)設(shè)計

【摘要】：當前雙護盾TBM在國內(nèi)外水工、鐵路、公路、市政和地鐵等隧道工程中獲得了越來越廣泛的應(yīng)用。在雙護盾TBM施工的隧道中,高地應(yīng)力條件下圍巖擠壓現(xiàn)象較為普遍,并成為了工程建設(shè)中日益突出的問題。工程實例表明:圍巖擠壓現(xiàn)象是雙護盾TBM管片結(jié)構(gòu)破壞的重要原因之一。有鑒于此,從擠壓性地層雙護盾TBM隧道圍巖形變及破壞特征的分析入手,在此基礎(chǔ)之上建立擠壓性地層條件下雙護盾TBM管片形變壓力的計算方法;結(jié)合擠壓性地層條件下雙護盾TBM特點建立相應(yīng)的管片結(jié)構(gòu)計算模型;最終提出擠壓性地層雙護盾TBM管片結(jié)構(gòu)設(shè)計方法。本文主要研究結(jié)論如下:(1)結(jié)合擠壓性地層條件下雙護盾TBM掘進支護特點,探明了擠壓性地層雙護盾TBM隧道圍巖開挖卸荷過程,圍巖經(jīng)歷了 3次位移釋放:①開挖面前方先行位移釋放;②護盾區(qū)域圍巖位移釋放;③管片-填充層-圍巖三者變形協(xié)調(diào)至穩(wěn)定過程的圍巖位移釋放;同時探明了隧道圍巖的橫向破壞特征:隧道拱頂圍巖易松散塌落,形成的灌漿層形變壓力傳導(dǎo)能力弱,隧道頂部地層抗力損失。(2)基于雙護盾TBM隧道圍巖開挖卸荷特點,建立了考慮時間因素的擠壓性地層雙護盾TBM管片形變壓力的計算方法;提出了管片-豆礫石組合支護剛度計算公式并分析了豆礫石灌漿層的力學(xué)作用。(3)結(jié)合擠壓性地層雙護盾TBM支護特點,建立了豆礫石-地層綜合抗力系數(shù)計算方法;通過研究近似確定了接頭轉(zhuǎn)動剛度與管片厚度的二次方關(guān)系,建立了基于接頭尺寸效應(yīng)的接頭剛度計算方法;并在此基礎(chǔ)之上形成了擠壓性地層雙護盾TBM管片結(jié)構(gòu)計算模型。(4)通過研究管片厚度、鋼筋配筋量對裂縫寬度的影響規(guī)律,建立了基于裂縫控制的擠壓性地層管片截面結(jié)構(gòu)設(shè)計方法;基于無襯墊式接頭力學(xué)特點,提出了無襯墊式接頭螺栓尺寸、材料以及錨固長度的設(shè)計方法。
[Abstract]:At present, double-shield TBM has been more and more widely used in hydraulic, railway, highway, municipal and subway tunnel projects at home and abroad. The extrusion phenomenon of surrounding rock is more common under the condition of high ground stress. It has become an increasingly prominent problem in engineering construction. Engineering examples show that the phenomenon of surrounding rock compression is one of the important reasons for the failure of TBM segment structure with double shield. Based on the analysis of the deformation and failure characteristics of the surrounding rock of the double-shield TBM tunnel in compressible strata, a method for calculating the deformation pressure of the TBM segment in the squeezed stratum is established. According to the characteristics of double shield TBM under compressible stratum, the corresponding segment structure calculation model is established. Finally, the design method of TBM segment structure in squeeze stratum is put forward. The main conclusions of this paper are as follows: 1) combined with the characteristics of double shield TBM tunneling support under the condition of squeeze stratum. The excavation and unloading process of TBM tunnel surrounding rock with double shield in compressible strata has been proved. The surrounding rock has experienced three times of displacement release: 1 ahead of excavating surface. (2) displacement release of surrounding rock in shield area; (3) displacement release of surrounding rock in which the deformation of segment, fill layer and surrounding rock is coordinated to the process of stabilization; At the same time, the transverse failure characteristics of tunnel surrounding rock are proved: the surrounding rock at the top of the tunnel is easy to collapse loosely, and the deformation pressure conduction ability of the grouting layer is weak. Based on the characteristics of surrounding rock excavation and unloading of double-shield TBM tunnel, the calculation method of deformation pressure of TBM segment of squeeze stratum with double shield is established considering time factors. In this paper, a formula for calculating the stiffness of the combined support of segment and pea gravel is put forward and the mechanical action of the grouting layer of pea gravel is analyzed. The characteristics of double shield TBM support combined with squeeze stratum are analyzed. The calculation method of comprehensive resistance coefficient of pea gravel and stratum is established. The quadratic relation between the rotational stiffness of the joint and the thickness of the segment is determined by studying and the method of calculating the stiffness of the joint based on the dimension effect of the joint is established. On the basis of this, the calculation model of double-shield TBM segment structure in squeeze stratum is formed. The influence of segment thickness and reinforcement quantity on crack width is studied. The section structure design method of squeeze stratum segment based on fracture control is established. Based on the mechanical characteristics of unpadded joint, the design method of bolt size, material and Anchorage length is presented.
【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】：U455.4

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