Abstract：The parameters of shield boring are more complicated in mixed ground than in the single strata, and the difference of the boring parameters is different under different strata. In order to study the variation law of shield boring parameters and correlation with strata in mixed ground, this paper based on the Φ7m composite EPB shield of Che Gong Miao~Hong Shu Wan section and Nan Shan~Qian Hai Wan section of Shen Zhen metro line 11, according to different strata in typical section of interval, the correlation between 5 key shield boring parameters and 6 main strata was analyzed by means of mathematical statistics. The results show: the difference in the total thrust between different strata is not significant, which is 1320.94~1697.33t, but the volatility of the total thrust in hard rock strata is the largest, the minimum is 789.38t, the maximum reached 1994.52t| The average of the advancing velocities in different strata is large, among which the average of the advancing speed is the lowest in the granite differential weathering and hard rock formations, which is about 20mm/min| The cutterhead torque of hard disk formation was up to 5 times higher than other formation conditions, and the difference between the other strata is little, the average is 608.93~822.27kN·m| The speed of cutterhead is less discrete in each layer, the difference is not significant, which is 1.5~1.9r/min| The average difference of penetration degree in different strata is large, the highest is up to 40mm/r, and the lowest in the granite difference weathering strata and hard rock is about 12mm/r. The research results can provide guidance for the selection and optimization of boring parameters of similar shield under mixed ground condition.
