本文選題：隧道空洞缺陷 + 隧道病害　； 參考：《北京交通大學(xué)》2017年碩士論文

【摘要】：近年來我國(guó)隧道與地下工程建設(shè)迅猛發(fā)展,受制于諸多不利因素的影響,相當(dāng)比例的已建或運(yùn)營(yíng)隧道存在隧道空洞質(zhì)量缺陷。隧道空洞缺陷具有隱蔽性特點(diǎn),它不直接構(gòu)成襯砌結(jié)構(gòu)的病害實(shí)體,但其間接導(dǎo)致襯砌結(jié)構(gòu)發(fā)生其他病變,潛在的危害性巨大。因此研究隧道空洞缺陷下襯砌結(jié)構(gòu)的病變對(duì)于明晰隧道空洞的致災(zāi)機(jī)制具有重大的現(xiàn)實(shí)意義。有鑒于此,在總結(jié)分析前人研究成果的基礎(chǔ)上綜合運(yùn)用調(diào)查研究、理論分析和數(shù)值模擬計(jì)算等研究方法,做了以下研究工作:(1)系統(tǒng)的研究分析了隧道空洞的成因與危害,從"圍巖—支護(hù)"相互作用關(guān)系的角度揭示了隧道空洞引發(fā)結(jié)構(gòu)坍塌的機(jī)理。(2)研究了在自重地應(yīng)力場(chǎng)與水平地應(yīng)力場(chǎng)中隧道拱頂空洞橫向與豎向尺寸參數(shù)對(duì)襯砌結(jié)構(gòu)內(nèi)力的影響規(guī)律,并對(duì)比分析了兩參數(shù)對(duì)襯砌結(jié)構(gòu)內(nèi)力影響的強(qiáng)弱。研究認(rèn)為:1)在兩種形式的地應(yīng)力場(chǎng)中拱頂空洞及其毗鄰區(qū)域內(nèi)襯砌結(jié)構(gòu)的彎矩值隨著隧道拱頂空洞橫向尺寸或豎向尺寸的增大而呈線性增加的趨勢(shì);2)兩種形式的地應(yīng)力場(chǎng)中隧道拱頂空洞橫向尺寸對(duì)襯砌結(jié)構(gòu)內(nèi)力的影響強(qiáng)于隧道拱頂空洞豎向尺寸對(duì)襯砌結(jié)構(gòu)內(nèi)力的影響。(3)基于"地層—結(jié)構(gòu)"模型,采用模擬材料斷裂的新理論—擴(kuò)展有限單元法(XFEM)研究了自重地應(yīng)力場(chǎng)與水平地應(yīng)力場(chǎng)中隧道襯砌背后不同位置存在單一空洞與組合空洞時(shí)襯砌結(jié)構(gòu)的裂縫分布規(guī)律與隧道結(jié)構(gòu)的破損狀況。研究認(rèn)為1)在自重地應(yīng)力場(chǎng)中襯砌結(jié)構(gòu)在隧道空洞影響下易發(fā)生開裂破壞而不易發(fā)生壓潰破壞;2)在水平地應(yīng)力場(chǎng)中襯砌結(jié)構(gòu)在隧道空洞影響下開裂破壞與壓潰破壞相伴發(fā)生;3)在不同形式的地應(yīng)力場(chǎng)中隧道空洞對(duì)襯砌結(jié)構(gòu)的破壞強(qiáng)度不同,隧道空洞在水平地應(yīng)力場(chǎng)中對(duì)襯砌結(jié)構(gòu)的潛在破壞力更強(qiáng)。(4)通過分析研究認(rèn)為隧道空洞的致災(zāi)機(jī)理大致經(jīng)歷以下三個(gè)階段:1)初期階段—空洞的萌發(fā)及結(jié)構(gòu)外擠變形;2)中期階段—隧道結(jié)構(gòu)變形裂損;3)后期階段—結(jié)構(gòu)裂縫延伸擴(kuò)展。
[Abstract]:In recent years, the construction of tunnels and underground projects in our country has developed rapidly. Due to the influence of many unfavorable factors, a considerable proportion of built or operated tunnels have defects in tunnel quality. The defect of tunnel cavity has the characteristics of concealment, which does not directly constitute the diseased entity of the lining structure, but it indirectly leads to other pathological changes of the lining structure, and the potential harm is enormous. Therefore, it is of great practical significance to study the damage of lining structure under tunnel cavity defects for clarifying the mechanism of tunnel cavities. In view of this, on the basis of summing up and analyzing the previous research results, this paper makes comprehensive use of the methods of investigation, theoretical analysis and numerical simulation calculation, and does the following research work: (1) the causes and hazards of tunnel cavities are systematically studied and analyzed. From the angle of the interaction between surrounding rock and support, the collapse mechanism of tunnel cavities induced by cavities is revealed. (2) the lateral and vertical dimension parameters of tunnel arch cavities to lining in the field of gravity stress and horizontal ground stress are studied. The influence law of internal force of structure, The influence of two parameters on the internal force of lining structure is compared and analyzed. It is found that the bending moment of the arch cavities and their adjacent lining structures in two forms of in-situ stress field increases linearly with the increase of the transverse or vertical dimensions of the tunnel arch cavities. In the field of in-situ stress, the influence of the transverse dimension of the tunnel arch roof cavity on the internal force of the lining structure is stronger than that of the vertical dimension of the tunnel vault cavity on the lining structure. (3) based on the "stratigraphic structure" model, In this paper, a new theory of simulating material fracture, extended finite element method (XFEM), is used to study the crack distribution of tunnel lining when there are single cavity and combined cavity behind tunnel lining in the field of gravity ground stress and horizontal field of ground stress. Law and damage condition of tunnel structure. The results are as follows: 1) under the influence of tunnel cavities, the lining structure is liable to crack and destroy but not to be crushed under the influence of tunnel cavity. 2) in horizontal ground stress field, the lining structure is cracked and broken under the influence of tunnel cavity. 2) in horizontal ground stress field, the lining structure is cracked and broken under the influence of tunnel cavity. The failure intensity of tunnel cavity on lining structure is different in different forms of in-situ stress field. (4) through the analysis and research, it is concluded that the mechanism of tunnel cavities has experienced the following three stages: 1: 1) initial stage-cavity germination and structural extrapolation. (4) through analysis and research, it is concluded that the mechanism of tunnel cavities is caused by the following three stages: the initial stage: the germination of cavities and the extrapolation of structures. Form 2) middle stage-tunnel structure deformation and crack damage 3) late stage-structural crack extension and extension.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U451.4

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