Some Issues during TBM Trial Advance of Super-long Tunnel Group and Development Direction of Construction Technology
(1 Xinjiang Erqis River Basin Development and Construction Administration Bureau, Urumqi 830000；2 School of Civil Engineering,Beijing Jiaotong University, Beijing 100044)
Abstract：
The total length of the water transfer project phase Ⅱ is 540 km in the northern area of Xinjiang Uygur Autonomous Region of China, of which the total length of tunnels is about 516 km. The tunnel boring machine (TBM) and drilling & blasting method were adopted for the tunnel construction, the main tunnels include 18 TBM tunnelling sections and 3 shield tunnelling sections, and the branch tunnels include 2 TBM tunnelling sections. The tunnelling length of single TBM is more than 15 km, and the maximum tunnelling distance is up to 26 km. It poses unprecedented challenges on the tunnel design and construction technique due to the group driving, adverse geology and extreme hard rock, long tunnelling distance by TBM and other construction risks and difficulties. Based on the summary and analysis of the TBM performance in the trial tunnelling, several aspects on the development directions of TBM construction of super-long tunnels were put forward to improve the technical level of safe and efficient TBM tunnelling. Namely, real-time advance geological prediction technique for rapid TBM excavation should be studied;developing of the TBM equipment with better geologic adaptability should be conducted; the intelligent TBM tunnelling technique should be studied; the real-time monitoring technique for TBM equipment state should be studied;the surrounding rock classification and corresponding supporting system should be studied; the auxiliary rock breaking technique should be developed; the one-end high-pressure ventilation technique for the super-long tunnel should be studied; the belt conveyor transportation technique should be developed for the super-long tunnel. By improving performance of TBM equipment and optimizing tunnel design and construction method, the adaptability of TBM equipment to various geological conditions is increased and safe and efficient TBM tunnelling for super-long tunnels is realized.
DENG Mingjiang1 TAN Zhongsheng2
.Some Issues during TBM Trial Advance of Super-long Tunnel Group and Development Direction of Construction Technology[J] MODERN TUNNELLING TECHNOLOGY, 2019,V56(5): 1-12
2019, Vol. 56 