【摘要】：研究目的:在偏壓地形中,隧道開挖引起的地層損失可能導致傾斜地表和水平地表的沉降或隆起,造成地層及地面上建筑物發(fā)生不均勻沉降,影響建筑物的安全,因此有必要對隧道開挖引起的地表豎向位移進行估算與分析。研究結(jié)論:(1)論文基于隨機介質(zhì)理論,推導了淺埋偏壓盾構(gòu)隧道開挖地表沉降公式;(2)通過理論推導修正了地表沉降公式計算所需的斷面收斂區(qū)域U'-V';(3)計算過程中,為簡化計算,采用極坐標改進了傾斜地表和水平地表沉降公式;(4)淺埋偏壓條件下,傾斜地層坡度α≥45°時,位移變化速率明顯加快;此外,地表豎向位移最大值同開挖單元深度與沉降半徑之比呈現(xiàn)出一種線性關(guān)系;(5)隧道軸線到斜坡表面的垂直距離d3.5R時,地表豎向位移變化也會加快,所以隧道修筑應盡量選擇在d≥3.5R的位置;(6)該研究成果可為淺埋偏壓隧道開挖的地表位移預測提供一種新途徑,為地表位移控制提供技術(shù)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 偽 鈮，

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