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近距离双孔并行盾构隧道地层位移预测及分布规律研究

, PP. 109-117

Keywords: 隧道工程,双孔盾构隧道,随机介质理论,地层位移,收敛模式

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Abstract:

为了探讨近距离双孔并行盾构隧道地层位移场分布规律,以随机介质理论和隧道断面的非均匀收敛模式为基础,推导了双孔隧道地层位移的理论计算公式,采用提出的方法探讨了双孔隧道在不同位置的关系及埋深条件下的地层位移分布规律,并结合实际工程验证了理论方法的有效性.研究表明隧道上方地层内部位移以竖向沉降为主,不同深度处的地层位移大小、影响范围以及分布形式并不相同;与浅部地层位移相比,深部地层位移更大,但位移影响范围更小,且地层沉降槽的双峰特征更加明显;倾斜对齐的双孔隧道的周围地层水平位移分布呈现非对称性,土体发生不同方向的水平剪切变形并会对该区域内的地下结构造成附加剪切作用.

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