Research on Treatment Measures for Giant Karst Cave at D1K671+670 of Xiaosanxia Tunnel
Based on the development characteristics of giant karst cave at the bottom of D1K671+670 of Xiaosanxia Tunnel in Chongqing section on Zhengzhou-Wanzhou High-speed Railway and the engineering supplementary survey data,this paper makes a comparative analysis from the aspects of construction difficulty,operation risk and engineering investment,and finally determines the treatment scheme for box girder bridge crossing the karst cave.Through structural calculation and engineering analogy,the structure design of tunnel pile foundation joist is carried out.The tunnel vault cavity adopts the arch protection + buffer layer scheme,and the surface river channel is paved with concrete.The engineering practice shows that the comprehensive treatment measures for the giant karst cave have achieved good results,which can be used as reference for similar engineering.
tunnelbox girder bridgegiant karst cavepile foundation joist
NETL
NSTL
万方数据
维普
