本文關(guān)鍵詞： 鐵路隧道 監(jiān)控量測 有限元分析 參數(shù)優(yōu)化　出處：《西南交通大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：山西中南部鐵路通道是我國第一條設(shè)計(jì)軸重30T新建重載鐵路,本文以中南部鐵路通道西鐵車2號隧道施工為背景,對隧道支護(hù)參數(shù)進(jìn)行了研究。論文首先在對實(shí)際監(jiān)測數(shù)據(jù)分析的基礎(chǔ)上,利用位移等級管理評估既有支護(hù)參數(shù),并利用監(jiān)測數(shù)據(jù)對有限元計(jì)算參數(shù)進(jìn)行優(yōu)化；其次,通過用有限元的計(jì)算分析對未開挖段圍巖的變形趨勢進(jìn)行預(yù)測,評估當(dāng)前支護(hù)參數(shù)的合理性,結(jié)合超前地質(zhì)預(yù)報(bào),對支護(hù)方案優(yōu)化提出合理化建議。通過現(xiàn)場監(jiān)測數(shù)據(jù)分析與有限元模擬得到如下結(jié)論：(1)位移等級管理在西鐵車2號隧道施工中應(yīng)用具有可行性,可通過位移等級管理進(jìn)行隧道施工安全管理,評估支護(hù)效果,指導(dǎo)施工。(2)有限元模擬數(shù)據(jù)與實(shí)際監(jiān)控量測存在偏差,但結(jié)果可靠,可以通過數(shù)值分析對未開挖隧道變形情況進(jìn)行預(yù)測。(3)根據(jù)有限元模擬數(shù)值分析預(yù)測,西鐵車2號隧道DK1079+280～DK1079+200段設(shè)計(jì)支護(hù)參數(shù)較弱,需重新進(jìn)行設(shè)計(jì)以滿足初期支護(hù)強(qiáng)度的要求。(4)新奧法隧道施工中支護(hù)參數(shù)的強(qiáng)弱直接影響隧道開挖后的變形,初期支護(hù)對控制圍巖變形有重要作用,合理的支護(hù)參數(shù)可以控制圍巖的變形,確保結(jié)構(gòu)安全。通過模擬分析,發(fā)現(xiàn)西鐵車2號隧道在中等～弱風(fēng)化灰?guī)r為主地質(zhì)條件下,采用116型鋼,間距1.2m,錨桿長度3.0m,環(huán)縱間距均1.2m,拱墻噴射混凝土厚度18cm,仰拱噴射混凝土厚度10cm的初期支護(hù)參數(shù),可以有效控制圍巖變形,位移可實(shí)現(xiàn)Ⅱ級管理,在打設(shè)超前小導(dǎo)管的超前支護(hù)下,可正常進(jìn)行作業(yè),經(jīng)濟(jì)效益好,無支護(hù)材料浪費(fèi)。
[Abstract]:Shanxi central and southern railway passage is the first designed axle load 30T new heavy-haul railway in China. This paper takes the construction of West Rail car No. 2 Tunnel as the background. Firstly, based on the analysis of actual monitoring data, the existing support parameters are evaluated by displacement grade management, and the finite element calculation parameters are optimized by monitoring data. Secondly, the deformation trend of the surrounding rock in the unexcavated section is predicted by finite element analysis, and the rationality of the current supporting parameters is evaluated, combined with the advanced geological prediction. Through the analysis of field monitoring data and finite element simulation, the following conclusions are drawn: 1) the application of displacement grade management in the construction of No. 2 tunnel of West Railway Che is feasible. The safety management of tunnel construction can be carried out by displacement grade management, the support effect can be evaluated, and the finite element simulation data can be guided. 2) there is a deviation from the actual monitoring measurement, but the results are reliable. The deformation of unexcavated tunnel can be predicted by numerical analysis. The design support parameters of DK1079 280 DK1079200 section of West Railway Che No. 2 Tunnel are weak. It needs to be redesigned to meet the requirements of initial support strength.) the strength of support parameters in the construction of the New Austrian tunneling directly affects the deformation of the tunnel after excavation. The initial support plays an important role in controlling the deformation of surrounding rock. Reasonable supporting parameters can control the deformation of surrounding rock and ensure the safety of structure. Through simulation and analysis, it is found that the No. 2 tunnel of Xitie Che adopts 116 steel under the geological condition of medium to weak weathered limestone. The initial support parameters are 1.2m spacing, 3.0m bolt length, 1.2m ring longitudinal spacing, 18cm thickness of arch wall shotcrete and 10cm thickness of inverse-arch shotcrete. The deformation of surrounding rock can be effectively controlled and the displacement can be managed in the second grade. Under the advance support with small lead ducts, the work can be carried out normally, with good economic benefit and no waste of supporting materials.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U455.7

【共引文獻(xiàn)】

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