【摘要】：近年來我國地下軌道交通建設(shè)快速發(fā)展,新建地鐵隧道下穿既有道路工程案例大量涌現(xiàn),下穿施工技術(shù)難度大、地層沉降控制要求高、不確定因素多,若施工過程中控制措施不合理,不但影響隧道內(nèi)施工,對(duì)地面車輛行車安全也有較大范圍的影響,因此受到國內(nèi)外學(xué)者的廣泛關(guān)注。為此,依托深圳地鐵7號(hào)線停車場(chǎng)出入線下穿北環(huán)大道快車道工程,采用理論計(jì)算方法、數(shù)值模擬方法、現(xiàn)場(chǎng)監(jiān)測(cè)分析等技術(shù)手段相結(jié)合,對(duì)地鐵隧道穿越既有市政道路的地層變形規(guī)律與控制方法進(jìn)行研究,主要取得以下結(jié)論:(1)提出基于皮爾曲線模型的隧道施工地層變形三維時(shí)空預(yù)測(cè)模型,并將其拓展到地鐵雙線隧道。利用等效土柱法推導(dǎo)出地鐵隧道下穿既有道路統(tǒng)一計(jì)算公式,并給出公式中相關(guān)參數(shù)確定方法。(2)依托深圳地鐵七號(hào)線停車場(chǎng)出入線下穿北環(huán)大道快車道工程,給出雙線隧道下穿既有市政道路計(jì)算算例,并與現(xiàn)場(chǎng)路面監(jiān)測(cè)結(jié)果進(jìn)行對(duì)比,驗(yàn)證了方法的合理性。隨后對(duì)現(xiàn)場(chǎng)監(jiān)測(cè)結(jié)果進(jìn)行綜合分析。(3)依托現(xiàn)場(chǎng)實(shí)際地質(zhì)條件和具體施工設(shè)計(jì)建立三維數(shù)值模型,進(jìn)行有限差分計(jì)算,對(duì)數(shù)值模擬得到的變形、應(yīng)力進(jìn)行分析,基于流固耦合模塊對(duì)隧道開挖造成的孔壓變化和滲流情況進(jìn)行分析,研究了隧道間距對(duì)臨近隧道的影響關(guān)系�？偨Y(jié)目前常用的隧道圍巖加固措施,通過數(shù)值模擬對(duì)超前加固措施進(jìn)行比選,并對(duì)超前加固工藝進(jìn)行進(jìn)一步討論。
[Abstract]:In recent years, the construction of underground rail transit has developed rapidly in our country, and a large number of new subway tunnel underpass existing road engineering cases have emerged, the technology of underpass construction is difficult, the control of stratum settlement is high, and there are many uncertain factors. If the control measures in the construction process are unreasonable, not only the tunnel construction will be affected, but also the safety of the ground vehicles will be affected to a large extent. Therefore, the scholars at home and abroad have paid much attention to it. To this end, relying on Shenzhen Metro Line 7 parking lot access line under the North Ring Road expressway project, the use of theoretical calculation method, numerical simulation method, on-site monitoring and analysis and other technical means combined, The formation deformation law and control method of subway tunnel crossing the existing municipal road are studied. The main conclusions are as follows: (1) A three-dimensional spatio-temporal prediction model of stratum deformation in tunnel construction is proposed based on Pier curve model. It will be extended to the subway dual-line tunnel. By using the equivalent soil column method, the unified calculation formula for the existing road under the subway tunnel is derived, and the method for determining the relevant parameters in the formula is given. (2) based on the entry and exit line of the parking lot of Shenzhen Metro Line 7, the project of crossing the North Ring Road expressway under the entrance and exit line of Shenzhen Metro Line 7 is given. A calculation example of two-line tunnel under the existing municipal road is given, and compared with the results of field pavement monitoring, the rationality of the method is verified. Then the field monitoring results are comprehensively analyzed. (3) based on the actual geological conditions and concrete construction design, the three-dimensional numerical model is established, the finite difference calculation is carried out, and the deformation and stress obtained from the numerical simulation are analyzed. Based on the fluid-solid coupling module, the variation of pore pressure and seepage caused by tunnel excavation are analyzed, and the influence of tunnel spacing on the adjacent tunnel is studied. This paper summarizes the reinforcement measures of tunnel surrounding rock in common use at present, compares and selects the advanced reinforcement measures through numerical simulation, and further discusses the advanced reinforcement technology.
【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U456.3;U231.3

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