Risk Analysis on Shield Type Selection at Compound Stratum

For selecting shield type in metro construction,taking the shield type selection at compound stratum in Guangzhou for example,the suitability of the suited cutter heads and cutters,cutting mode and the working param- eters etc.to the stratum were discussed in this paper.And the risk of shield tunneling in such stratum was analyzed after the type of shield was selected.The result showed that selecting a suitable shield machine in compound stratum is an important risk factor in shield tunneling construction.And some suggestions of selecting shield in compound stratum are given to be referenced in similar conditions.