About the author:

1.CCCC Road and Bridge Construction Co., Ltd., Beijing 101100, China;2. Tunnel and Underground Engineering Research Center of Ministry of Education, Beijing Jiaotong University, Beijing 100044. China

Abstract:

The construction of an extra-long and large cross-section highway tunnel is the key for entire construction period in expressway. To ensure construction quality and improve construction progress, the principles for supporting large-scale mechanized equipment, such as matching with geological conditions, low environmental pollution, performance matching, reliable function, advanced technology, controllable cost, and strong universality, were proposed based on Yangjiawopu Extra-long and Large Cross-section Highway Tunnel project of G95 Chengping section of Capital Ring Expressway (Hebei Chengde-Beijing Pinggu). The performance and efficiency of mechanical equipment used in drilling and blasting, initial support, inverted arch construction, and secondary lining construction were analyzed. The construction progress of Yangjiawopu Tunnel is one month ahead of schedule after adopting the drilling and blasting large-scale mechanized construction technology.