地下工程预备口开挖的静力有限元分析

预备口对提高地下工程的生存能力有着重要影响,针对其特殊构造形式,运用有限元软件ANSYS进行三维数值模拟,分析预备口开挖过程中围岩应力和变形的分布规律。开挖过程中,围岩应力及时释放并重新分布,拱顶下沉变形最大,侧墙中点横向变形较明显;侧墙与底板交界处应力集中,预留掌子面处应力和轴向变形较其他断面要弱。为今后的施工提供借鉴。为今后的施工提供借鉴。

Static Analysis of Underground Excavating as Structure Prearrangement Entrance on the Finite Element Method

Prearrangement entrance is important for improving the security of the underground structure . Three dimensional numerical simulations are carried out on the excavation process as an underground shielding structure for prearrangement entrance using the business software named as ANSYS. When the excavation was proceeding, stress and energy on the surrounding body were delivered and redistributed. Subsidence on the apex of arch was the largest and the horizontal deformation on the midpoint of the side wall was sharp. Stress concentration occurred on the intersection berween side wall and baseplate. Stress and deformation in the palm plane is weaker than in other sections.