一、前言地下交通线路通常都较浅地穿过地面有建筑物地区。在这种情况下,洞室的支护要求就和一般的隧道有着本质的区别。一般来说,支护措施服务于有效断面的安全。出于经济方面的考虑,人们通过适当地选择支护安装时机和其刚度,也即支护的可塑性,以便对荷载的大小及其分布产生有利的影响,在这个方面,新奥法的优越性已 First, the preface Underground traffic lines are usually shallow through the ground with the building area. In this case, the cave support requirements are essentially different from those of a normal tunnel. In general, support measures serve the safety of effective sections. For economical reasons, the superiority of the new Austrian law in this respect has been achieved by the proper choice of the timing and stiffness of the support installation, ie the plasticity of the support, in order to have a beneficial effect on the size and distribution of the load Already