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Calculation and analysis of plastic zone and ground settlement for shield tunnel

机译：盾构隧道塑性区及地表沉降计算与分析。

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Since the stress release in a tunnel’s surrounding soil mass is the overall result of shield driving,by analyzing it as a plane strain problem, the ground settlement can just be regarded as a consequence of the stress release. Because not only is the ground surface stress zero, but the stress at infinity is also zero according to Saint-Venant’s principle. Under the assumption that the stress release is axisymmetric, stresses in soil caused by excavation can be obtained by the solution for an infinite plate with a circular hole in the plane elasticity.Knowing stresses in soil, the radius of the plastic zone can be calculated according to the Mohr Coulomb Theory.In the case that the plastic radius of the vault is small in some value of a release of stress, the ground settlement curve equation can be derived from the solution of the infinite elastic plate.
机译：由于隧道周围土壤中的应力释放是盾构驱动的总体结果，因此通过将其分析为平面应变问题，可以将地面沉降视为应力释放的结果。因为不仅地表应力为零，而且根据Saint-Venant的原理，无穷大处的应力也为零。在假定应力释放为轴对称的情况下，可通过求解平面弹性中带有圆孔的无限板的解来获得由开挖引起的土壤中的应力。知道土壤中的应力后，可根据以下公式计算塑性区的半径如果拱顶的塑性半径在应力释放的某个值较小的情况下，则可以从无限弹性板的解导出地面沉降曲线方程式。

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