APPLICATION OF SINGLE-LAYER LINING BASED ON GEOLOGICAL SKETCH-MAP IN QINGDAO METRO

Single-layer lining is a very mature technology in Europe, which is developed continuously in the construction process of hard rock underground engineering based on Q system. Since the introduction of single-layer lining technology in the 1960s, China has adopted single-layer lining as permanent lining in more than a dozen projects, and achieved good results. However, due to the construction technology, materials, equipment and management, it has not been fully popularized. Based on the research project of single-layer lining of Xizhen Station of Qingdao Metro, this paper introduces the function and content of geological logging for tunnel construction, and expounds in detail the specific requirements, principles, key points and steps of drawing full-section geological sketch-map of single-layer lining. Finally, according to the results of geological logging and sketch maps, the six parameters of Q system are assigned and the corresponding Q values are calculated. According to(Q,D_e) in Q system supporting maps, the tunnel supporting parameters are preliminarily determined, The Unwedge program was used to analyze the stability of the wedge block with the main discontinuities combination before and after the support. and the final design parameters of single-layer lining support are determined by referring to geological conditions and local experience of similar projects in the past.