本文選題：公路隧道 + 襯砌病害��； 參考：《重慶大學(xué)》2014年碩士論文

【摘要】：近年來，我國(guó)基礎(chǔ)設(shè)施建設(shè)取得了迅猛發(fā)展，高速公路建設(shè)總里程不斷增大。隨著我國(guó)公路建設(shè)項(xiàng)目的不斷增多，隧道建設(shè)也取得了豐碩的成就，但建設(shè)也顯現(xiàn)出一些問題，一些隧道剛竣工即出現(xiàn)大量的襯砌病害問題。這些病害的出現(xiàn)一方面與隧道工程的模糊性和復(fù)雜性有關(guān)，另一方面也與隧道的施工技術(shù)和質(zhì)量控制有關(guān)系。論文以西南地區(qū)某高速公路隧道的設(shè)計(jì)和檢測(cè)資料為基礎(chǔ)，，對(duì)隧道襯砌厚度病害、空洞病害及襯砌裂縫進(jìn)行研究分析，主要研究?jī)?nèi)容和成果如下： ①對(duì)隧道進(jìn)行了現(xiàn)場(chǎng)調(diào)研和檢測(cè)工作，詳細(xì)分析了隧道的檢測(cè)和設(shè)計(jì)資料，對(duì)隧道病害進(jìn)行統(tǒng)計(jì)分類。 ②運(yùn)用ANSYS軟件分析了襯砌厚度病害在III級(jí)、IV級(jí)和V級(jí)圍巖中對(duì)結(jié)構(gòu)穩(wěn)定性的影響，得出襯砌厚度與結(jié)構(gòu)安全系數(shù)、彎矩、軸力和剪力的關(guān)系，認(rèn)為襯砌結(jié)構(gòu)的安全系數(shù)、彎矩、軸力、剪力在II~V級(jí)圍巖中的變化規(guī)律基本一致，襯砌結(jié)構(gòu)較危險(xiǎn)截面位于襯砌的拱頂、拱腰和邊墻墻腳部位。 ③通過數(shù)值計(jì)算分析襯砌背后空洞病害在III級(jí)和IV級(jí)圍巖中對(duì)結(jié)構(gòu)穩(wěn)定性的影響，得出襯砌結(jié)構(gòu)最大拉應(yīng)力與空洞寬度、空洞高度及空洞面積的變化規(guī)律，認(rèn)為空洞尺寸的變化在III級(jí)圍巖中導(dǎo)致的襯砌結(jié)構(gòu)上的最大拉應(yīng)力的增幅大于IV級(jí)圍巖，空洞寬度改變對(duì)襯砌結(jié)構(gòu)最大拉應(yīng)力的影響較空洞高度改變的影響大。 ④通過對(duì)隧道襯砌裂縫的評(píng)估方法進(jìn)行分析，提出了便于現(xiàn)場(chǎng)檢測(cè)判別的襯砌單條裂縫的評(píng)定方法和整座隧道襯砌裂縫“最不利原則”綜合評(píng)定法。 ⑤從隧道施工的角度分析了襯砌厚度病害、空洞病害的產(chǎn)生原因，從圍巖變形和襯砌本身缺陷分析了襯砌裂縫的成因，認(rèn)為隧道襯砌厚度病害和空洞病害與隧道施工過程質(zhì)量控制有密切的關(guān)系，襯砌結(jié)構(gòu)存在缺陷時(shí)結(jié)構(gòu)的彎張作用與剪切作用常導(dǎo)致結(jié)構(gòu)發(fā)生受拉裂縫和錯(cuò)臺(tái)裂縫。并據(jù)此提出了隧道病害相應(yīng)的預(yù)防和處治措施。
[Abstract]:In recent years, the construction of infrastructure in China has made rapid development, the total mileage of highway construction is increasing.With the increasing number of highway construction projects in our country, the tunnel construction has made a lot of achievements, but the construction also shows some problems, some tunnels have a large number of lining problems as soon as they have been completed.The emergence of these diseases is related to the fuzziness and complexity of tunnel engineering on the one hand and the construction technology and quality control of tunnel on the other.Based on the design and inspection data of a highway tunnel in southwest China, this paper studies and analyzes the diseases of tunnel lining thickness, cavities and cracks. The main research contents and results are as follows:The main contents are as follows: (1) the site investigation and inspection work of tunnel are carried out, the detection and design data of tunnel are analyzed in detail, and the tunnel diseases are classified statistically.2 the influence of lining thickness disease on structural stability in III grade IV and V surrounding rock is analyzed by using ANSYS software. The relationship between lining thickness and structural safety factor, moment, axial force and shear force is obtained, and the safety factor and bending moment of lining structure are considered.The variation law of axial force and shear force in II~V grade surrounding rock is basically the same, and the dangerous section of lining structure is located at the arch top, arch waist and side wall foot of lining.(3) through numerical calculation, the influence of cavity disease on structural stability in III class and IV grade surrounding rock is analyzed, and the variation law of maximum tensile stress and cavity width, cavity height and cavity area of lining structure are obtained.It is considered that the maximum tensile stress of lining structure caused by the change of cavity size in III grade surrounding rock is larger than that of grade IV surrounding rock, and the influence of the change of cavity width on the maximum tensile stress of lining structure is greater than that of cavity height change.Through the analysis of the evaluation method of tunnel lining crack, this paper puts forward the evaluation method of single crack of lining and the comprehensive evaluation method of "the most unfavorable principle" of the crack of the whole tunnel lining.5. From the angle of tunnel construction, the causes of lining thickness diseases and cavities are analyzed, and the causes of lining cracks are analyzed from the deformation of surrounding rock and the defects of lining itself.It is considered that the defects of tunnel lining thickness and cavity are closely related to the quality control of tunnel construction process. When there are defects in lining structure, the flexural and shearing actions often lead to tensile cracks and staggered platform cracks.Based on this, the corresponding prevention and treatment measures of tunnel diseases are put forward.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U457.2

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