About the author:

1.Key Laboratory of Urban Security and Disaster Engineering of Education, Beijing University of Technology, Beijing 100124,China; 2.China Construction Infrastructure Co., Ltd., Beijing 100037,China; 3.State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084,China

Abstract:

For the evaluation of the boring performance of double-shield TBM in urban subway tunnels under complex geological conditions, this paper relies on the TBM construction section of the left and right lines of ChuangShi section of Qingdao Subway Line 6, and collects and analyzes the construction data of the whole line to study the changes in the boring parameters and construction performance parameters of double-shield TBM under different surrounding rock categories. The analysis of the TBM utilization rate under different rock mass conditions shows that double-shield TBM has good adaptability to the complex rock masses. The relationship between various excavation parameters and engineering specific energy SE is analyzed under different types of surrounding rock. The correlation between penetration and specific energy is the best, making it more suitable as an indicator for evaluating energy consumption during TBM excavation. Moreover, under different types of surrounding rock, penetration has a good negative power exponential relationship with engineering specific energy SE. In types II, III, IV, and V of surrounding rock, when the penetration exceeds 2mm/r, 5mm/r, 8mm/r, and 10mm/r, respectively, the corresponding engineering rock breaking specific energy SE is at a lower level.