中巴公路浅埋偏压隧道二次衬砌受力监测分析研究  

Monitoring Analysis Investigation of Secondary Lining of Shallow-buried Bias Tunnel of Karakoram Highway

作　　者：杨波 程寅[2] 王登炳 罗志刚 姑丽比娅.艾斯卡尔 王栋 

机构地区：[1]中国路桥工程有限责任公司,北京市100011 [2]交通运输部科学研究院,北京市100029 [3]新疆交通运输工程质量监督局,乌鲁木齐市830000

出　　处：《公路》2017年第1期236-239,共4页Highway

基　　金：国家自然科学基金面上资助项目;项目编号51308266;交通运输部西部交通建设科技资助项目;项目编号2013318J01100

摘　　要：利用振弦式传感器对中巴喀喇昆仑公路堰塞湖改线段浅埋偏压隧道的二次衬砌进行现场监测,采集得到初支与二次衬砌间应力和二次衬砌混凝土应变的随时间变化规律并进行分析。测试结果表明,隧道初支与二次衬砌间接触紧密,二次衬砌有效承担了初支传递的围岩形变应力,且在二次衬砌施作后50d后应力基本保持稳定;初支与二次衬砌间所受的应力右幅大于左幅,存在偏压受力情况;二次衬砌混凝土应变初始阶段是拉应变,随着时间的增长,混凝土应变转为压应变阶段并逐渐变形稳定。综合监测结果可知,各监测值都在规范规定的安全值范围内,该浅埋偏压隧道二次衬砌结构受力稳定,可靠安全。The in-site monitoring of secondary lining structure of a shallow-buried bias tunnel （2 tunnel） of Karakoram Highway is conducted by vibrating-wire sensors, the variation laws of Ocontact stress between primary support and secondary lining, secondary lining concrete strain are obtained. The results show that： the contact between primary support and secondary lining is close, which indicates that the secondary lining bears the deformation stress of surrounding rock, and the stress is stable after 50 days of secondary lining construction. The right stress between primary support and secondary lining is greater than the left, and there is biasing force. Secondary lining concrete strain is stable after experiencing a conversion from tension strain to compressive strain. The conclusion can be known through above monitoring results, various monitored values are within the safe range specification, and the force structure of secondary lining of shallow-buried bias tunnel is stable, reliable and safe.

关 键 词：浅埋偏压隧道 二次衬砌 应力 应变 现场监测 

分 类 号：U451.4[建筑科学—桥梁与隧道工程]