论文部分内容阅读
在土木工程技术领域,有许多创新其机理并不见得复杂,究其原因往往在于社会生产能力的提高,尤其是机械装备的进步。隧道及地下工程的技术进步就是实例。自上个世纪以
In the field of civil engineering, there are many innovations in which the mechanism is not complicated. The reason is often the improvement of social productive capacity, especially the progress of mechanical equipment. The technical progress of tunnels and underground works is an example. Since the last century