發(fā)布時(shí)間：2018-07-17 20:48

【摘要】：國(guó)內(nèi)外的實(shí)踐表明，土體的沉降變形對(duì)于使用盾構(gòu)法進(jìn)行施工的隧道來(lái)說(shuō)是難以避免的，從安全以及工程質(zhì)量等方面考慮，有必要將變形控制在合理的范圍之內(nèi)。諸多主要施工因素中，盾尾注漿的控制是影響土體變形沉降的最為重要的因素之一。為此，本文針對(duì)盾尾注漿出現(xiàn)相對(duì)于正常注漿的壓力偏差時(shí)，對(duì)土體以及隧道襯砌變形的影響規(guī)律進(jìn)行研究。 有限差分法是土工數(shù)值分析的重要方法，本文以廣州地鐵三號(hào)線某盾構(gòu)區(qū)間作為數(shù)值模擬的工程基礎(chǔ)，利用有限差分軟件FLAC3D，針對(duì)不同長(zhǎng)度的施工區(qū)間出現(xiàn)注漿壓力偏差的情況進(jìn)行模擬，對(duì)土體以及襯砌的變形規(guī)律進(jìn)行了分析。 結(jié)果表明，，盾尾注漿壓力偏差及偏差范圍的增大引起的土體豎向變形的變化規(guī)律，在盾構(gòu)掘進(jìn)方向上不同長(zhǎng)度范圍內(nèi)隨土體的埋深、與隧道的相對(duì)距離的不同而表現(xiàn)出不同的規(guī)律。注漿壓力偏差幅值維持不變時(shí)，對(duì)于壓力偏差產(chǎn)生的變形，其變形收斂性受到土體所在位置以及偏差范圍大小的影響。據(jù)此，本文提出，將隧道上方受壓力偏差影響土體劃分為注漿壓力偏差范圍敏感區(qū)與非敏感區(qū)。
[Abstract]:The practice at home and abroad shows that the settlement deformation of soil is unavoidable for the tunnel constructed by shield method. Considering the safety and engineering quality, it is necessary to control the deformation within a reasonable range. Among the main construction factors, the control of shield tail grouting is one of the most important factors affecting soil deformation and settlement. Therefore, this paper studies the influence law of soil and tunnel lining deformation when shield tail grouting appears relative to the normal grouting pressure deviation. The finite difference method is an important method for geotechnical numerical analysis. In this paper, a shield section of Guangzhou Metro Line 3 is taken as the engineering foundation of numerical simulation. The finite difference software FLAC3D is used to simulate the deviation of grouting pressure in different length construction sections. The deformation law of soil and lining is analyzed. The results show that the variation law of vertical deformation of soil caused by the deviation of grouting pressure and deviation range of shield tail grouting varies with the depth of soil in the different length range in the heading direction of shield tunneling. The relative distance from the tunnel shows different laws. When the amplitude of grouting pressure deviation remains constant, the deformation convergence of grouting pressure deviation is affected by the position of soil and the range of deviation. According to this, the soil affected by pressure deviation above the tunnel can be divided into sensitive zone and non-sensitive area in the range of grouting pressure deviation.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U455.43

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 范曉秋;洪寶寧;胡昕;蔣敏敏;;水泥砂漿固化土物理力學(xué)特性試驗(yàn)研究[J];巖土工程學(xué)報(bào);2008年04期

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