摘要
为探索隧道初期支护安全系数的计算问题,并为高速铁路隧道支护参数优化提供理论依据,根据喷锚支护的性能与特点以及现代隧道力学的基本理论,建立初期支护荷载结构模型和对应的安全系数计算方法;针对时速350km高速铁路双线隧道提出的3种不同的初期支护方案(无系统锚杆支护、喷锚结合支护和以锚为主的支护方案)展开适应性研究,计算分析不同埋深(400m和800m)条件下初期支护的优化参数以及优化后的二次衬砌承载能力,在此基础上提出优化后的高铁隧道支护参数建议值,并对优化前后的安全系数进行计算与对比。主要结论如下:1)提出了采用围岩压力代表值作为荷载结构模型设计荷载的方法,为解决设计中围岩压力不确定的问题提供了思路,且所推荐的围岩压力代表值计算方法具有安全性与经济性;2)提出了3种初期支护计算模型,可以为初期支护构件的选择与量化设计提供一定的理论基础;3)提出了时速350km高速铁路双线隧道初期支护方案及优化后的复合式衬砌设计参数,并明确了不同围岩级别、不同埋深时的承载主体;4)提出了按照不同埋深进行支护结构参数设计的建议。
According to the performance and characteristics of shotcrete-bolt support and the basic theory of modem tunnel mechanics,the load-structure model of primary support and the corresponding safety factor calculation methods are established.Firstly,the construction feasibility of three different primary support schemes including no systematic bolt support,shotcrete-bolt support and bolt-based support is studied by taking high-speed double-track railway tunnel with speed of 350 km/h for example.And then,the optimized primary support parameters and the bearing capacity of the optimized secondary lining under different burial depths(i.e.,400 m and 800 m)are discussed;and based on which,the recommended values of the high-speed railway tunnel support parameters are proposed and comparison is made on calculation results before and after optimization in terms of safety factor*Some main conclusions are drawn as follows:1)The method of using representative surrounding rock pressure in the load-structure model is put forward,which could provide ideas for solving the surrounding rock pressure problems in design phase;and the representative values of surrounding rock pressure are with safety and economy.2)Three calculation models are put forward,which could provide rational and effective methods for selecting and quantifying the primary support components.3)The primary support schemes and optimized composite lining design parameters of the high-speed double-track railway tunnel with speed of 350 km/h are put forward;and the main bearing structures of different grades of surrounding rock and burial depths are also defined.4)Suggestions are proposed for the burial-depth-based design of support structure parameters.
作者
肖明清
陈立保
徐晨
王少峰
王克金
XIAO Mingqin;CHEN Liba;XU Chen;WANG Shaofen;WANG Kejin(China Railway Siyuan Survey and Design Group Co.,Ltd.430063,Wuhan,Hubei,China)
出处
《隧道建设（中英文）》
北大核心
2018年第3期406-413,共8页
Tunnel Construction
关键词
高速铁路隧道
支护参数
荷载结构模型
安全系数法
设计方法
high-speed railway tunnel
support parameters
load-structure m odel
safety factor method
design method
