Improving progress of construction for large-span tunnels in weak surrounding rock

With the development of the times and the improvement of construction technologies,tunnel construction technology has become advanced and sophisticated,and the theology gradually strengthened,leading to increasingly rigorous requirements for construction progress.The main problem which is expected to solve for tunnel excavation is how to improve the speed and efficiency of construction,so as to make sure the delivery will be made at the right time,as well as with the right quality and quantity.The theology on tunnel excavation and support has been gradually established.However,the proper management and arrangement of connection between the construction procedures has become a key factor to affect the construction progress.This document will theologically and practically analyze the every procedure of the construction for large-span tunnels in weak surrounding rock in terms of various factors affecting the progress.It is designed to make reasonable connection between and arrangement of the construction procedures,so as to reduce dramatically the time spending in each one,meeting the demand for quality and speed of the construction for large-span tunnels in weak surrounding rock.