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本文分析了在浅埋隧道施工和运营过程中所发生的山体和衬砌变形现象,推导出浅埋隧道地层压力的计算公式。在垂直压力和侧压力的计算中考虑了土壤粘聚力和内摩擦角、洞顶荷载和地面坡度的影响,也考虑了破裂面抗剪强度在破裂面形成过程中和形成以后的变化的影响。本文方法经过实例验证,基本符合实际;且能解释一些衬砌变形原因,以及粘土质隧道侧压力系数较大的现象。
This paper analyzes the phenomena of deformation of the mountain and lining during the construction and operation of shallow tunnels, and derives the calculation formula for the formation pressure of shallow tunnels. The effects of soil cohesion and internal friction angle, top load, and ground slope are considered in the calculation of vertical pressure and lateral pressure. The influence of the shear strength of the fracture surface during and after the formation of the fracture surface is also considered. . This method has been verified by examples and is basically in accordance with the actual situation; it can explain the causes of deformation of some linings and the phenomenon that the lateral pressure coefficient of clay tunnels is larger.