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文章采用两阶段法和数值模拟方法的分析结果,验证了应用整体数值模拟方法研究隧道开挖对邻近群桩的影响是可靠的。借助有限差分数值软件,通过采用Mohr-Coulomb弹塑性屈服准则,建立三维数值模型,研究了砂性土中不同应力释放率、不同桩间距、不同桩长情况下群桩遮拦效应的变化规律。分析结果表明:隧道开挖时的应力释放对群桩的遮拦效应影响不大;除桩体沉降以外,群桩的遮拦效应系数曲线基本上随桩间距的增大而逐渐减小;群桩桩长差异的变化对群桩遮拦效应的影响情况比较复杂,不同指标在不同桩长情况下的变化规律呈现出一定的不协调性。
In this paper, the results of two-stage method and numerical simulation are used to verify that it is reliable to study the influence of tunnel excavation on the adjacent pile groups by using the numerical simulation method. With the help of finite difference numerical software and the Mohr-Coulomb elasto-plastic yield criterion, a three-dimensional numerical model was established to study the variation rule of pile-block effect under different stress release rates, different pile spacing and different pile lengths in sandy soil. The results show that the stress release during tunnel excavation has little effect on the blocking effect of pile groups. The coefficient of obstruction effect of pile groups decreases with the increase of pile spacing except for settlement of pile body. The influence of the variation of long difference on the obscuring effect of pile groups is rather complicated, and the variation of different indexes in different pile lengths shows some inconsistencies.