基于数值模拟的隧道开挖及支护设计

Design of excavation and bracing of the tunnel based on numerical simulation

利用有限元软件midas gts对冲山隧道的开挖过程进行数值模拟,通过对围岩的位移分析和初期支护的受力分析,证明拟定的支护体系是合理有效的。最后得出结论:本支护体系效果明显,对抑制围岩变形起到了积极的作用,但拱脚部位和隧道进出口断面需要加强处理。

In this paper, a comprehensive study about recycling of existing pile foundation was carried out com- bined with the durability and bearing capacity assessment of the pile. Factors like chlorine ion erosion rate, the degree of corrosion of steel, pile integrity, the strength of the concrete pile and ultimate bearing capacity were obtained through a analysis and study of 20a Pile in a reconstructed project in Jimo. It can be drawn through comprehensive a- nalysis and evaluation that the existing pile foundation in the project meets the requirements of the new project on the pile bearing capacity as well as the durability requirements of pile, thus it can be used as the new pile foundation. three piles were ramdomly picked on the site,test materials and data were collected to provide accurate data analysis for this article, and valid reference methods and numerical basis for future similar projects were provided.