摘要
针对兰渝铁路黑山隧道二叠系板岩大变形特征,展开了拱顶下沉、水平收敛、初支围岩压力、初支混凝土应力及初支钢架应力等测试,对该隧道的大变形进行了研究。结合国内外大变形分级标准和采用的措施,提出了该软岩隧道具有工程特性、应力状态和所处地质构造背景特殊复杂的特点,在这些因素共同作用下,产生了围岩变形特征复杂的大变形。施工中除了按照围岩级别对应的支护措施,还要结合大变形等级综合考虑,采取加强措施才能控制变形,确保施工安全顺利。
In light of large deformation characteristics of Heishan Tunnel in Lanzhou-Chongqing Railway, the vault crown settlement, horizontal convergence, initial support surrounding rock pressure, initial support concrete stress and initial sup- porting steel framework stress were tested, and great deformation was researched. Combined with large deformation of the grad- ing standards and some adopted measures at home and abroad, the paper presented that the combination of engineering char- acteristic, stress condition and geological structure background of special complex characteristics brought complicated large deformation of surrounding rock. Corresponding support measures should be considered in accordance with the level of sur- rounding rock during construction, moreover, large deformation level must be considered synthetically. Strengthen measures should be taken to control the deformation and to ensure construction safety and smoothness.
出处
《铁道建筑技术》
2016年第4期40-43,共4页
Railway Construction Technology
基金
中铁十九局集团有限公司科研项目(10-30C)
关键词
软岩隧道
高地应力
变形特征
分级标准
soft rock tunnel
high crustal stress
deformation characteristics
classification standard
