基于随机介质理论的浅埋偏压隧道沉降预测
发布时间：2018-12-11 06:28
【摘要】：研究目的:在偏压地形中,隧道开挖引起的地层损失可能导致倾斜地表和水平地表的沉降或隆起,造成地层及地面上建筑物发生不均匀沉降,影响建筑物的安全,因此有必要对隧道开挖引起的地表竖向位移进行估算与分析。研究结论:(1)论文基于随机介质理论,推导了浅埋偏压盾构隧道开挖地表沉降公式;(2)通过理论推导修正了地表沉降公式计算所需的断面收敛区域U'-V';(3)计算过程中,为简化计算,采用极坐标改进了倾斜地表和水平地表沉降公式;(4)浅埋偏压条件下,倾斜地层坡度α≥45°时,位移变化速率明显加快;此外,地表竖向位移最大值同开挖单元深度与沉降半径之比呈现出一种线性关系;(5)隧道轴线到斜坡表面的垂直距离d3.5R时,地表竖向位移变化也会加快,所以隧道修筑应尽量选择在d≥3.5R的位置;(6)该研究成果可为浅埋偏压隧道开挖的地表位移预测提供一种新途径,为地表位移控制提供技术支持。
[Abstract]:The purpose of this study is: in the partial pressure terrain, the ground loss caused by tunnel excavation may lead to the settlement or uplift of the inclined surface and horizontal surface, resulting in uneven settlement of the stratum and the buildings on the ground, which will affect the safety of the building. Therefore, it is necessary to estimate and analyze the vertical surface displacement caused by tunnel excavation. The conclusions are as follows: (1) based on the theory of random medium, the paper deduces the ground subsidence formula of shield tunnel excavation with shallow burying bias pressure, (2) through theoretical deduction, the section convergence region U _ (+) -V _ (1), which is needed to calculate the surface settlement formula, is modified. (3) in order to simplify the calculation, the polar coordinates are used to improve the formula of inclined surface and horizontal surface subsidence, (4) under the condition of shallow buried bias pressure, the rate of displacement change is accelerated obviously when the slope of inclined stratum 伪 鈮，
本文编号：2372052
[Abstract]:The purpose of this study is: in the partial pressure terrain, the ground loss caused by tunnel excavation may lead to the settlement or uplift of the inclined surface and horizontal surface, resulting in uneven settlement of the stratum and the buildings on the ground, which will affect the safety of the building. Therefore, it is necessary to estimate and analyze the vertical surface displacement caused by tunnel excavation. The conclusions are as follows: (1) based on the theory of random medium, the paper deduces the ground subsidence formula of shield tunnel excavation with shallow burying bias pressure, (2) through theoretical deduction, the section convergence region U _ (+) -V _ (1), which is needed to calculate the surface settlement formula, is modified. (3) in order to simplify the calculation, the polar coordinates are used to improve the formula of inclined surface and horizontal surface subsidence, (4) under the condition of shallow buried bias pressure, the rate of displacement change is accelerated obviously when the slope of inclined stratum 伪 鈮，
本文编号：2372052
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