Composite stratum shield tunneling efficiency on-site prediction and calculation method

The invention discloses a composite stratum shield tunneling efficiency on-site prediction and calculation method. The method mainly comprises the steps that a rock crushing degree index of a drilledrock core is measured and calculated; the BQ value of each stratum is calculated according to engineering investigation data, and the rock slag point load intensity is obtained according to rock slagsof a construction site; and an empirical relationship formula between the crushing degree index and the point load intensity is obtained; and based on the result and the area ratio of each stratum ofa tunnel face, a composite stratum full-section on-site rock mass tunneling difficulty index RH can be obtained, and finally a composite stratum shield tunneling efficiency prediction model established based on the total shield thrust F and the RH is obtained according to the tunneling efficiency, the total thrust, the cutterhead torque and the tunneling rate. The method can be directly applied to the shield construction s