本文選題：盾構(gòu)法施工　切入點(diǎn)：沉降　出處：《重慶交通大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：隧道盾構(gòu)法是城市軌道交通施工中重要的施工方法，，它相比其他隧道開挖方法有穩(wěn)定性好、對地面影響相對較小的優(yōu)點(diǎn)，但利用盾構(gòu)法施工時(shí)仍然會(huì)對隧道周圍的土體不可避免地有一些擾動(dòng)，引起隧道周圍土層環(huán)境發(fā)生變化。 本文對寧波市軌道交通一二號(hào)線典型區(qū)間地表沉降觀測數(shù)據(jù)進(jìn)行統(tǒng)計(jì)分析，總結(jié)了寧波特有的軟土環(huán)境下軌道交通盾構(gòu)開挖地表橫向和縱向沉降發(fā)展規(guī)律。對選定區(qū)間進(jìn)行盾構(gòu)開挖時(shí)土體深層沉降和水平位移監(jiān)測，整理相關(guān)數(shù)據(jù)進(jìn)行分析，確定了盾構(gòu)開挖深層影響規(guī)律和三維影響范圍。 對典型區(qū)間實(shí)測地表沉降曲線進(jìn)行擬合，得出了寧波軌道交通隧道盾構(gòu)施工時(shí)的橫向和縱向沉降預(yù)測公式，并與典型peck公式和Sagaseta縱向沉降公式結(jié)果進(jìn)行了對比，對比的結(jié)果說明本文提出的沉降預(yù)測公式對寧波軌道交通工程更加準(zhǔn)確適用。 利用ANSYS建立DP模型對寧波軌道交通盾構(gòu)開挖進(jìn)行了數(shù)值模擬，把模擬的結(jié)果數(shù)據(jù)與實(shí)測結(jié)果數(shù)據(jù)對比，進(jìn)一步分析盾構(gòu)開挖對周圍環(huán)境的影響規(guī)律，確認(rèn)ANSYS數(shù)值模擬的有效性，同時(shí)也確定了不同土質(zhì)環(huán)境下模型參數(shù)的取值范圍。
[Abstract]:The shield tunneling method is an important construction method in the construction of urban rail transit. Compared with other tunnel excavation methods, it has the advantages of better stability and less influence on the ground. However, there will still be some disturbance to the soil around the tunnel when the shield method is used, which will cause the change of the soil layer around the tunnel. In this paper, the surface subsidence observation data of typical section of Ningbo rail transit line 1 and 2 are statistically analyzed. This paper summarizes the development law of horizontal and longitudinal ground subsidence in shield excavation of rail transit under the unique soft soil environment in Ningbo. The deep settlement and horizontal displacement of soil are monitored during shield excavation in selected section, and the relevant data are analyzed. The deep influence law and three dimensional influence range of shield excavation are determined. By fitting the measured surface settlement curve of typical section, the prediction formulas of transverse and longitudinal settlement during shield tunneling construction of Ningbo rail transit tunnel are obtained, and the results are compared with those of typical peck formula and Sagaseta longitudinal settlement formula. The results show that the settlement prediction formula proposed in this paper is more accurate and applicable to Ningbo rail transit project. The numerical simulation of shield tunneling in Ningbo rail transit is carried out by using DP model established by ANSYS. Comparing the simulated data with the measured data, the influence of shield excavation on the surrounding environment is further analyzed. The validity of ANSYS numerical simulation is confirmed, and the range of model parameters under different soil conditions is also determined.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU433;U455.43

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