【摘要】：地鐵盾構(gòu)施工引起的地層位移和地面沉陷及建筑物開裂、損壞等問題已經(jīng)成為隧道建設(shè)者、設(shè)計者和施工者最為關(guān)心的環(huán)境問題與工程問題。近些年來，國內(nèi)外學(xué)者針對盾構(gòu)施工誘發(fā)的地表沉降問題也做了大量的研究，并取得了一定的成果。但是在分析目前已有理論對地表沉降的預(yù)測結(jié)果時發(fā)現(xiàn)，在預(yù)測過程中并沒有同時考慮開挖隧道周圍土體彈塑性變形和土體移動模式對盾尾環(huán)形收斂空間形態(tài)和大小的影響，導(dǎo)致預(yù)測結(jié)果與實測結(jié)果相比都偏大。文中在隨機介質(zhì)理論預(yù)測模型的基礎(chǔ)上，利用彈塑性理論的相關(guān)知識和對土體移動模式的分析，對盾尾環(huán)形收斂空間和地層主要影響角進行了分析計算。取得了如下成果： （1）從理論上解釋了盾構(gòu)推進時的地層變形機理，歸納總結(jié)了引起地層損失的主要因素。在此基礎(chǔ)上，利用彈塑性理論的相關(guān)知識對單孔圓形隧道盾構(gòu)開挖后的應(yīng)力-應(yīng)變狀態(tài)進行彈塑性理論分析，得到了隨機介質(zhì)理論中考慮了盾尾彈塑性變形的盾尾環(huán)形收斂空間計算式。 （2）分析了隨機介質(zhì)理論中地層主要影響角對預(yù)測結(jié)果的影響，并通過分析盾構(gòu)過后隧道上覆土體移動模式對地表沉降的影響，結(jié)合土體移動焦點理論，得到了盾構(gòu)施工引起地表沉降預(yù)測時主要影響角的確定方法。 （3）使用Matlab計算軟件，并編寫了隨機介質(zhì)地表沉降預(yù)測公式相應(yīng)的Matlab計算程序，實現(xiàn)了地鐵盾構(gòu)施工誘發(fā)的地表沉降的預(yù)測。并分析了在盾構(gòu)施工誘發(fā)的地表沉降中，隧道的埋深、隧道半徑、斷面收斂量、地層主要影響角、盾尾彈塑性變形量、偏心超挖量以及開挖面處的附加壓力對地表沉降的影響。 （4）根據(jù)文中對盾構(gòu)過后斷面收斂量和地層主要影響角的計算，并結(jié)合已有的隧道周圍土體的不均勻收斂計算模型，，將隨機介質(zhì)預(yù)測模型分為兩個部分，得到了既可以考慮彈塑性變形的影響，又可以考慮土體移動模式影響的不均勻收斂計算模型。 （5）利用本文所述的方法分別對西安地鐵一號線、二號線和三號線某區(qū)間段盾構(gòu)施工段誘發(fā)的地表沉降進行了預(yù)測，并與實測結(jié)果進行了比較。分析可知，理論預(yù)測結(jié)果與實測結(jié)果較符合，故可供工程實際參考。
[Abstract]:The problems of ground displacement, ground subsidence, building cracking and damage caused by shield tunneling have become the most concerned environmental and engineering problems by tunnel builders, designers and constructors. In recent years, scholars at home and abroad have done a lot of research on the ground subsidence caused by shield construction, and have achieved certain results. However, after analyzing the prediction results of ground subsidence in the existing theories, it is found that the influence of soil elastoplastic deformation and soil movement model on the shape and size of shield tail annular convergence space is not considered simultaneously in the prediction process. As a result, the predicted results are larger than the measured ones. Based on the prediction model of random medium theory and using the knowledge of elastic-plastic theory and the analysis of soil movement model, the paper analyzes and calculates the ring convergence space of shield tail and the main influence angle of stratum. The results are as follows: (1) the mechanism of formation deformation during shield tunneling is explained theoretically and the main factors causing formation loss are summarized. On this basis, the elastic-plastic theory is used to analyze the stress-strain state of single-hole circular tunnel shield tunneling by using the relevant knowledge of elastic-plastic theory. In the theory of stochastic medium, the formula for calculating the ring convergence space of shield tail considering the elastoplastic deformation of shield tail is obtained. (2) the influence of the main influence angle of stratum on the prediction results is analyzed in the random medium theory, and by analyzing the influence of the movement mode of the overlying soil on the ground settlement after shield tunneling, combining with the theory of soil movement focus, The method of determining the main influence angle in the prediction of surface settlement caused by shield construction is obtained. (3) using Matlab calculation software and compiling the Matlab calculation program corresponding to the prediction formula of surface subsidence in random medium, the prediction of ground subsidence induced by shield construction of subway is realized. The influence of tunnel depth, tunnel radius, cross section convergence, formation influence angle, shield tail elastoplastic deformation, eccentricity overexcavation and additional pressure on surface settlement are analyzed. (4) according to the calculation of section convergence and the main influence angle of stratum after shield tunneling, and combined with the existing non-uniform convergence model of soil around the tunnel, the stochastic medium prediction model is divided into two parts. A non-uniform convergence model, which can not only consider the effect of elastic-plastic deformation but also the influence of soil movement mode, is obtained. (5) using the method described in this paper, the ground subsidence induced by shield tunneling in a section of Xi'an Metro Line 1, Line 2 and Line 3 is predicted, and the results are compared with the measured results. The analysis shows that the theoretical prediction results are in good agreement with the measured results, so it can be used as a reference for engineering practice.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U455.43

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本文編號：2346627