2.makes calculated analysis in details for some key parameters, such as thrust force of EPB-type shield and torque moment, etc. and transportation system within tunnel constructed by shield driven method through concrete works examples;
4.Optimized design of grading shield in cool source ducts of CARR is to use the characteristic statistic algorithm(CSA) and ANISN to find the optimized collocation of shielding materials in the shielding part,which keeps the total dose rate outside concrete wall at lowest level when strobes closed.
5.The bomber, the machine-gun, the long-range gun and poison gas are developments of the spear, while the air-raid shelter, the steel helmet, the concrete fortification and the gas mask are developments of the shield.
