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该文基于粘弹性理论,建立了一个适用于深厚冲积层的考虑冻结壁与外层井壁以及周围土体共同作用的粘弹性计算模型,模型中同时考虑了冻结壁的蠕变变形。导出了作用于冻结壁上的外荷载表达式和冻结壁的应力分布规律以及作用于外层井壁上的冻结压力解析式和井壁的应力分布规律。用该文提出的理论计算公式得到的外层井壁上的冻结压力随时间的变化与现场实测数据吻合良好,验证了该方法的合理性,可为冻结法凿井的外层井壁结构设计提供依据。
Based on the theory of viscoelasticity, a viscoelastic model considering the interaction of frozen wall with outer wellbore and surrounding soil is established, which is suitable for deep alluvium. The model also considers the creep deformation of frozen wall. The stress distribution law of the external load acting on the frozen wall and the frozen wall and the stress distribution law of the freezing pressure and the wall acting on the outer shaft wall are derived. With the theoretical calculation formula proposed in this paper, the variation of the freezing pressure on the outer shaft lining with the time is in good agreement with the measured data, which verifies the rationality of the method and provides a reference for the design of the outer shaft lining of freezing shaft Provide evidence.