许多建筑物地下有好几层,供办公、停车以及设备用。在设计和材料选用时,耐久性是必须的。当地下结构发生渗漏问题时,往往处理缺少操作空间或费用昂贵。因而,地下结构施工必须认真 Many buildings have several floors underground for office, parking and equipment use. Durability is a must when designing and selecting materials. When leakage problems occur in the subsurface structure, the lack of operational space or cost is often dealt with. Therefore, the construction of underground structures must be serious