For an ultra-shallow buried double-arch tunnel with a large cross-section, the arching effect is difficult to form in surrounding rock, and grouting method often adopted reinforce rock. Hence, examining reinforcement parameters of great significance for potential failure collapse prevention. The land part Haicang undersea was selected as case study; laboratory experiments, theoretical analysis,...

• Effect of protective walls on reducing the impact tunnelling piled structures. Protective can reduce induced ground movements retained side. wall could pile settlement and structural distortions. The shaft resistance development. Tunnel excavation in urban areas causes that damage existing nearby In practice, to protect structures from tunnelling-induced damage, a stiff be constructed between...