本文選題：公路隧道　切入點(diǎn)：膨脹性圍巖　出處：《長(zhǎng)安大學(xué)》2016年碩士論文

【摘要】：為適應(yīng)經(jīng)濟(jì)發(fā)展的要求,近30年來(lái),我國(guó)修建了大量公路隧道。隨著在役隧道服務(wù)時(shí)間的增加,很多隧道出現(xiàn)了不同程度的病害現(xiàn)象。病害隧道中,穿過(guò)膨脹性圍巖地帶的隧道的病害尤為顯著。據(jù)統(tǒng)計(jì),膨脹巖對(duì)各種結(jié)構(gòu)工程具有極大危害,全世界每年因膨脹巖造成的經(jīng)濟(jì)損失高達(dá)數(shù)億美元。我國(guó)是膨脹性巖土體分布較為廣泛的國(guó)家,分布在陜西等近20省份,膨脹性巖土介質(zhì)導(dǎo)致結(jié)構(gòu)病害較為普遍,它的特殊性質(zhì)給我國(guó)的工程建設(shè)造成了嚴(yán)重的經(jīng)濟(jì)損失和生態(tài)環(huán)境破壞。本文以麗龍高速公路馬嶺頭隧道工程為依托,通過(guò)資料收集,對(duì)該隧道原有設(shè)計(jì)及其變更情況進(jìn)行分析,同時(shí)結(jié)合該隧道病害發(fā)生的歷史及其治理措施進(jìn)行詳細(xì)梳理。在此基礎(chǔ)上,結(jié)合該隧道病害現(xiàn)有狀況,對(duì)該隧道的病害程度進(jìn)行了專項(xiàng)檢測(cè)。檢測(cè)內(nèi)容主要包括:隧道襯砌厚度、襯砌混凝土強(qiáng)度及襯砌和路面裂縫等。通過(guò)專項(xiàng)檢測(cè)數(shù)據(jù),對(duì)襯砌厚度等三個(gè)方面的結(jié)果進(jìn)行了分析,進(jìn)步明確了該隧道襯砌結(jié)構(gòu)與現(xiàn)有病害實(shí)際狀態(tài)。為了揭示隧道病害產(chǎn)生的根本原因,對(duì)隧道周邊圍巖與地質(zhì)狀況進(jìn)行補(bǔ)充調(diào)查與勘探,經(jīng)補(bǔ)充調(diào)查與勘探后發(fā)現(xiàn):馬嶺頭隧道所在山體存在斷層破碎帶,斷層破碎帶的巖性為泥巖、泥質(zhì)粉砂巖,具體成分主要為蒙脫石、伊利石、綠泥石等黏土礦物,具有膨脹性,且斷層破碎帶位于馬嶺頭隧道左右洞之間,且該斷層走向與隧道軸向間角度較小,揭示了病害產(chǎn)生的原因,也為該隧道病害整治奠定了基礎(chǔ)。結(jié)合隧道病害,本文對(duì)隧道支護(hù)結(jié)構(gòu)的安全性進(jìn)行了數(shù)值分析,經(jīng)分析發(fā)現(xiàn):支護(hù)結(jié)構(gòu)安全系數(shù)不能滿足規(guī)范的要求,隧道結(jié)構(gòu)安全存在潛在風(fēng)險(xiǎn)。最后,結(jié)合馬嶺頭隧道工程病害實(shí)際,提出了相應(yīng)的工程治理方案,依據(jù)各治理方案在具體實(shí)施過(guò)程中的可行性與效果的好壞,進(jìn)行方案比選,確定了最終治理方案,體現(xiàn)為該方案整治措施為主動(dòng)防水與被動(dòng)加固相結(jié)合的方法,采用重新施作二次襯砌的加固方案,把注漿帷幕技術(shù)引進(jìn)本隧道膨脹巖病害整治中,通過(guò)治理后該隧道使用效果來(lái)看,達(dá)到了最初的目的。
[Abstract]:In order to meet the requirements of economic development, a large number of highway tunnels have been built in China in the past 30 years.With the increase of service time in service tunnels, many tunnels appear different degrees of disease phenomenon.In the diseased tunnel, the disease of the tunnel passing through the expansive surrounding rock zone is especially significant.According to statistics, expansive rock has great harm to all kinds of structural engineering. The economic loss caused by expansive rock in the world is hundreds of millions of dollars every year.China is a country with extensive distribution of expansive rock and soil mass, which is distributed in nearly 20 provinces of Shaanxi and other provinces.Its special nature has caused serious economic loss and ecological environment damage to the engineering construction of our country.Based on the Malingtou Tunnel Project of Lilong Expressway, this paper analyzes the original design of the tunnel and its changes through data collection, and combs in detail the history of the tunnel disease and its treatment measures.On this basis, combined with the existing condition of the tunnel disease, the disease degree of the tunnel was detected.The main contents include: tunnel lining thickness, lining concrete strength, lining and pavement cracks.Based on the special test data, the results of three aspects, such as lining thickness, are analyzed, and the actual condition of the tunnel lining structure and existing diseases is clarified.In order to reveal the root cause of tunnel disease, supplementary investigation and exploration on surrounding rock and geological condition of tunnel are carried out. After supplementary investigation and exploration, it is found that there is a fault fracture zone in the mountain body of Malingtou Tunnel.The lithology of the fault fracture zone is mudstone, argillaceous siltstone, and the concrete composition is mainly montmorillonite, Illite, chlorite and other clay minerals, and the fault fracture zone is located between the left and right cavities of the Malingtou Tunnel.The angle between the fault strike and the tunnel axis is small, which reveals the cause of the disease and lays a foundation for the tunnel disease treatment.Combined with tunnel diseases, the safety of tunnel support structure is numerically analyzed in this paper. It is found that the safety factor of supporting structure can not meet the requirements of the code, and there are potential risks to the safety of tunnel structure.Finally, combining with the actual condition of the malingtou tunnel project, the corresponding project treatment scheme is put forward. According to the feasibility and effect of each treatment plan in the concrete implementation process, the scheme is compared and selected, and the final treatment plan is determined.This scheme is reflected in the combination of active waterproofing and passive reinforcement. The grouting curtain technology is introduced into the treatment of the expansive rock disease in this tunnel by means of the reinforcement scheme which is reapplied as the secondary lining.Through the treatment of the tunnel after the use of effect, to achieve the initial purpose.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：U457.2

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