中文摘要：

用改进的非连续变形分析（DDA）方法对某公路隧道进行了稳定性分析.采用有限元网格生成方法——行波法,在计算区域内自动生成三角形的DDA块体.块体的边界分为真实节理和虚拟节理,虚拟节理的强度取岩体的真实强度.另外,计算中还考虑了预应力锚杆对隧道围岩的加固作用.将计算得到的隧道拱顶、边墙的位移与现场监测结果进行了对比,两者基本吻合,说明改进的DDA方法在地下隧道的稳定性分析方面具有应有前景.

英文摘要：

The stability of a twin-tube highway tunnel is analyzed using improved discontinuous deformation analysis （DDA） method By employing advancing front method, the triangular DDA blocks are automatically generated in the computational area. In this process, numerous artificial joints whose strength is higher than that of real joints come into being. In addition, the reinforcing effect of prestressed bolt on the surrounding rock is also taken into account. The numerical results are compared with the measured data, and they show pretty good agreement; therefore, it is shown that the improved DDA method is capable of analyzing stability of underground tunnels.