Combination structure of light and heavy segment lining in tbm tunnel and its design method

Abstract

The invention relates to a light-heavy segmental lining combined structure of a TBM tunnel and a design method thereof. The light-heavy segmental lining combined structure comprises tunnel lining segments, and is characterized in that the lining segments in at least one tunnel section are arranged as the following structure that in the lining segments on the same ring, the reinforcement ratios of the segments in different position of the ring direction of the tunnel are not completely identical. In the lining segments on the same ring, the segments in the different positions of the ring direction of the tunnel have different reinforcement ratios, the structure breaks through the technical prejudice that the reinforcement ratios of the lining segments on the same ring must be consistent in the industry, and the reinforcement ratios of the corresponding segments in different positions can be reasonably distributed according to ground stress conditions, so that the pertinence of a support structure is higher, and the reinforcement ratio of a small-stress portion is reduced on the premise of guaranteeing structure stability. By means of the structural design, the construction cost is greatly reduced, unnecessary waste of reinforcements is avoided, and remarkable social and economic benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of construction of a shield tunnel or a TBM tunnel, and in particular relates to a light and heavy segment lining composite structure of a TBM tunnel and a design method thereof. Background technique [0002] Segment lining is widely used in underground engineering constructed by TBM or shield machine: in TBM tunnel or shield tunnel, the tunnel boring machine assembles the prefabricated segments to form a lining to prevent deformation or collapse of surrounding rock. In tunnel construction, the cost of tunnel lining often accounts for about 40%-50% of the entire tunnel project cost. Since the structural design of the segment directly affects the structural safety of the tunnel, the amount of reinforcement in the segment must meet the stability of the tunnel. However, if the structural design of the segment is too conservative, it will cause a huge waste of construction economy. [0003] In the traditional ...

AI Technical Summary

Problems solved by technology

In the traditional design method, the reinforcement is designed according to the stress situation of the maximum stress point, and the steel reinforcement installed in the segment with less stress cannot be fully utilized, that is, the amount of reinforcement is too high. causing unnecessary waste

[0005] In addition, before the excavation of the tunnel, various types of segments have been prefabricated. According to the traditional reinforcement mode, there will inevitably be too many heavy-duty prefabricated segments and too few light-weight prefabricated segments, resulting in unnecessary economic costs. loss

Images