Research on distribution law of TBM tunneling parameters and high-efficiency boring technology
Zhou Zhenliang1,2 Li Zonglin1,2 Guo Zhen3 Zhang Lilong3 Xiao Haihui3
1. Key Laboratory for Urban Underground Engineering of Ministry of Education, Beijing Jiaotong University, Beijing 100044, China;
2. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China;
3. China Railway 16th Bureau Group Co., Ltd., Beijing 100018, China
Abstract：The open tunnel boring machine (TBM) is widely used in the construction of headrace tunnels, and research on the distribution of its excavation parameters can guide the improvement of TBM excavation in terms of efficiency and stability. This study considered the actual construction situation of the second phase of the North Xinjiang water supply project, and investigated the excavation parameter data obtained over approximately 5 km. The change of the TBM driving parameters with the mileage and the law governing their distribution in the surrounding rock were analyzed. The correlation between the driving parameters was investigated, and a regression relationship between each parameter and the independent parameters was established. The TBM driving parameters were optimized to establish the high-efficiency driving range. During the driving of the TBM, the change of the surrounding rock type affects the stability and efficiency of driving, and type IIIa surrounding rock is more suitable to TBM driving. The thrust and cutter head speed were considered as independent parameters, and regression models of the independent parameters and other parameters were established through regression analysis. The optimized boring speeds of class Ⅱ～Ⅴ are 57.109 mm/min, 50.103 mm/min and 51.105 mm/min, and 46.67 mm/min and 44.55 mm/min.
