Abstract:

Under special geological conditions, big boulders may frustrate the shield boring or may cause the shield machine to deviate from the designed alignment. The concept of the crushing of big boulders in shield tunneling is presented and proposals are made on the design of earth pressure balance shields and slurry balance shields in terms of boulder treatment. Effective boulder treatment countermeasures are summarized and the principle of "crushing big boulders and discharging small boulders" is obtained.

Key words: slurry balance shield, earth pressure balance shield, boulder, deep hole blasting, cut hole pile, punched hole pile