厦门翔安海底隧道是我国第一条海底隧道，陆域浅埋暗挖地段，其地质条件差，多为全、强风化花岗岩，且地下水丰富。前期施工过程中支护结构常发生较大的变形，为了保证施工安全和进度，通过现场试验，得出一套合理的控制变形措施，使隧道拱顶下沉、水平收敛得到较好控制。在海底硬岩地段进行了钻爆试验，得出较好的爆破方案和参数，并采用声波仪和位移计对围岩损伤范围进行了检测。

Xiamen Xiang'an subsea tunnel is the first subsea tunnel in China, whose geological conditions in the land are strongly weathered granite with enriched groundwater, shallow-buried excavation method is adopted. During the tunnel construction, the deformation of tunnel support is great. It is important to seek for a reasonable countermeasure to restrict the large deformation to ensure safety construction and advance through trials in locale. The arch crown settlement and level convergence are controlled effectively. Its subsea geological condition is granite.Drilling hole and blasting parameters trials are carried out through construction, and better blasting plan and parameters are gained. The ranges of rock crash of the tunnels are measured by using ultrasonic instrument and displacement record.