Abstract:

The fault crushed zone F4-4 of the Qingdao Jiaozhou Bay subsea tunnel, is seriously influenced by the earth construction. And the stave rock, which has low intensity existence together with the high hydraulic pressure, is bad for thestability, so the possibility of waterburst under violent geological condition is high, and the construction risk is enormous. The fullface curtain grouting technical parameters was determined by  onsite test.The main tunnel area grouting reinforcement was 5?m away from the tunnelexcavation contour lines. The grouting proliferation radius of the upper crosssection was 15m, and the proliferation grouting radius of the lower crosssection was 20?m. The grouting endpoint radius was 35?m, and the watercement ratio was 1∶1, and the grouting pressure was 3～4?MPa. The advancing grouting was used in constructiontechnology. Finally, the fullface curtain grouting plan and measure was successfully applied in the design and construction in the right line of the Qingdao Jiaozhou Bay subsea tunnel for passing through the No. F4-4 fault. This fullface curtain grouting has significance to similar project.

Key words: Qingdao Jiaozhou bay subsea tunnel;F4-4 waterburst fault;fullface curtain grouting