本文選題：山嶺隧道 + 下穿施工��； 參考：《西安建筑科技大學(xué)》2017年碩士論文

【摘要】：論文以新建商丘至合肥至杭州鐵路(安徽段)站前工程新大力寺隧道為工程背景,采用有限元數(shù)值模擬、現(xiàn)場監(jiān)測和理論分析相結(jié)合的方法對復(fù)雜環(huán)境條件下大斷面客專隧道下穿施工關(guān)鍵技術(shù)進行了分析研究,確定了山嶺地區(qū)隧道下穿省道區(qū)域應(yīng)采用的合理的施工工法,改進了爆破開挖設(shè)計方案,分析了隧道下穿新大力寺水庫施工穩(wěn)定性及水庫對隧道后期運營的影響。論文主要完成的工作及取得的成果如下:(1)針對淺埋暗挖隧道穿越既有省道的施工工法問題,以新大力寺隧道下穿208省道段為工程實例,利用MIDAS GTS/NX軟件進行有限元模擬分析,分別研究了二臺階法、三臺階法、六步CD法、雙側(cè)壁導(dǎo)坑法四種施工工法引起的隧道圍巖及支護結(jié)構(gòu)的受力和變形特性,基于數(shù)值模擬分析結(jié)果并結(jié)合不同工法的特點,推薦了大斷面客專隧道下穿既有省道“大管棚護頂條件+六步CD法”施工方案,指導(dǎo)了該段的施工,跟蹤施工進行的現(xiàn)場監(jiān)測驗證了推薦方案的合理、可行性。(2)對大斷面客專隧道下穿省道施工時通行車輛荷載對施工隧道穩(wěn)定性的影響,數(shù)值分析表明,就隧道周邊位移分析而言,汽車運行對圍巖位移無明顯的影響;就圍巖和襯砌的受力分析而言,路基下方與隧道軸線相交處隧道圍巖及支護結(jié)構(gòu)的應(yīng)力有變化,但變化量較小。為保證隧道的穩(wěn)定性,建議施工過程中應(yīng)對道路寬度范圍內(nèi)的隧道洞內(nèi)圍巖進行加固處置,以確保施工安全。(3)討論后期省道運營給新建隧道造成的振動影響,以保證運營過程中既有省道和新建隧道不相互影響,為今后類似山嶺地區(qū)隧道下穿公路或鐵路項目提供參考依據(jù)。(4)針對暗挖隧道鉆爆法開挖對臨近古建筑物的振動影響,以新大力寺隧道下穿新大力寺段為工程實例,分析了爆破時新大力寺隧道最危險點產(chǎn)生的振速和加速度情況,優(yōu)化了施工爆破方案,并對兩次優(yōu)化施工爆破方案進行對比分析,最后確定了合理、可行的施工爆破方案,指導(dǎo)了隧道的爆破施工。(5)針對水庫水的滲流對淺埋暗挖隧道開挖及后期運營的影響問題,以新大力寺隧道下穿大力寺水庫段為工程實例,利用有限元數(shù)值模擬分析方法,對不同滲透系數(shù)下隧道開挖與水庫水滲流綜合作用下隧道穩(wěn)定性進行研究,揭示了水的滲透影響下淺埋隧道失穩(wěn)機理。
[Abstract]:In this paper, based on the construction of Xindaisi Tunnel in front of the railway from Shangqiu to Hefei (Anhui section), the finite element numerical simulation is used. Based on the combination of field monitoring and theoretical analysis, the key techniques of underpass construction of large cross-section tunnel in complex environment are analyzed and studied, and the reasonable construction method of tunnel underpass in mountain area is determined. The design scheme of blasting excavation is improved, and the construction stability under the tunnel and the influence of the reservoir on the later operation of the tunnel are analyzed. The main works and achievements are as follows: (1) aiming at the construction method of shallow buried tunneling through the existing provincial roads, this paper uses Midas GTS / NX software for finite element simulation analysis, taking Xindusi tunnel underpass 208 provincial road as an engineering example. The stress and deformation characteristics of surrounding rock and supporting structure caused by two step method, three step method, six step CD method and double sidewall guide pit method are studied respectively. Based on the results of numerical simulation and combined with the characteristics of different construction methods, The construction scheme of "six steps CD method for protecting the roof condition of large pipe shed" under the existing provincial tunnel with large cross-section is recommended. The construction of this section is guided, and the field monitoring carried out by tracking the construction verifies the rationality of the recommended scheme. (2) the influence of the traffic load on the stability of the tunnel during the construction of large cross-section passenger tunnel, the numerical analysis shows that, as far as the surrounding displacement analysis of the tunnel is concerned, there is no obvious influence on the surrounding rock displacement by the vehicle operation; In terms of the stress analysis of surrounding rock and lining, the stress of surrounding rock and supporting structure at the intersection of subgrade and tunnel axis is changed, but the change is small. In order to ensure the stability of the tunnel, it is suggested that the surrounding rock in the tunnel within the width of the road should be strengthened and disposed during the construction to ensure the safety of the tunnel construction. (3) the vibration effect caused by the late running of the dart to the new tunnel is discussed. In order to ensure that there is no interaction between existing provincial roads and newly built tunnels during operation, this paper provides a reference basis for the project of highway or railway under tunnels in similar mountain areas in the future. (4) aiming at the vibration effect of excavating tunnel by drilling and blasting method on adjacent ancient buildings, In this paper, the vibration velocity and acceleration of the most dangerous point in Xindangsi tunnel during blasting are analyzed, the blasting scheme of construction is optimized, and the blasting scheme of two optimal construction is compared and analyzed, taking the Xindangsi tunnel under the new Dadaosi tunnel as an engineering example to analyze the vibration velocity and acceleration of the most dangerous point in the tunnel during blasting. Finally, the reasonable and feasible construction blasting scheme is determined, which guides the blasting construction of the tunnel. (5) aiming at the influence of the seepage of reservoir water on the excavation of shallow buried tunnel and its later operation, The tunnel stability under the combined action of tunnel excavation and reservoir water seepage under different permeability coefficients is studied by using finite element numerical simulation analysis method, taking the tunnel under the new Dadaosi tunnel as an engineering example. The instability mechanism of shallow tunnel under the influence of water permeation is revealed.
【學(xué)位授予單位】：西安建筑科技大學(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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