English：

The structural design of reinforced concrete precast segments serves as a prerequisite forconstructing segmental tunnel lining using shield tunneling method. There are few studies on the methodfor designing and constructing segmental lining for water conveyance tunnel with round small cross sectionat home and abroad. Taking a mountainous tunnel in Guangxi Water Resources Allocation project aroundBeibu Gulf as a case study, the method to design and construct segmental lining for water conveyancetunnel with round small cross section to be constructed by using slurry shield driving method is discussed.Based on the geometric characteristics and parameters of constructing tunnel lining with round small crosssection, the method to calculate and design the segmentation of tunnel lining and the longitudinal bolt-holes as well as concave-convex-tenon on segments for water conveyance tunnel lining is presented, andthe detailed structure of precast segments as well as the construction method of segmental tunnel liningwith staggered or straight joints are also proposed.