长沙至昆明客运专线炭质板岩地段隧道设计初步研究

Preliminary Research on Design of Tunnels Built in Carbonaceous Slate on Changsha-Kunming Passenger-dedicated Line

长沙至昆明客运专线长沙至玉屏段炭质板岩隧道较多,根据国内已施工的项目反馈情况,炭质板岩地段隧道变形巨大,给隧道施工带来很大困难,而国内高速铁路大断面隧道建设中还没有遇到炭质板岩地层,完全借鉴国内已有的研究成果难以保证大断面炭质板岩隧道的施工安全,为保证隧道施工安全,通过调研、工程类比和理论计算对炭质板岩地段隧道支护参数进行研究。通过研究确定了不同围岩、不同地质条件的隧道支护参数。

During the construction of Changsha-Kunming Passenger-dedicated Line,many tunnels had to be built in carbonaceous slate.According to the experience of other projects,large deformation often appeared in tunnels built in such surrounding rock that caused great trouble to the construction.On the other hand,the experience and theory at present are not enough to assure the safety of the construction because it is the first time to build high speed railway tunnels with such a large section in carbonaceous slate in China.In order to assure the safety of the construction,through methods of investigation,analogy and theoretical calculation,the research on support parameters of tunnels built in carbonaceous slate was carried out and the supporting parameters under different surrounding rock as well as different geological conditions were determined.