266 / 2022-08-27 09:21:45

Optimal Design of Precast UHPC Utility Tunnel based on Life Cycle Cost Analysis

UHPC; utility tunnel; life cycle; optimized structure

UHPC utility tunnel has the characteristics of light weight and good durability, which can solve the problems of heavy self weight and high life-cycle cost. In this paper, based on the comprehensive utility tunnel in a test area, a trial design of UHPC utility tunnel is carried out, and the wall thickness is analyzed. The optimal structure of UHPC utility tunnel with stiffeners is proposed and the life-cycle cost analysis is carried out. The results show that the maximum stress of UHPC is increased from 4.6mpa to 64.7mpa, which can give full play to the characteristics of high compressive strength of UHPC; after optimization, the life-cycle cost of UHPC prefabricated composite utility tunnel is only 63% of the prototype structure, and the construction period is about 48% of the prototype common concrete utility tunnel.