中巴公路浅埋偏压隧道二次衬砌受力监测分析研究

发布时间：2018-11-24 10:33

【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。
[Abstract]:The secondary lining of shallow buried bias pressure tunnel in the modified section of Karakoram Highway is monitored by vibrating string sensor. The variation law of stress between primary and secondary lining and strain of secondary lining with time are obtained and analyzed. The test results show that the first branch of the tunnel is in close contact with the secondary lining, and the secondary lining effectively bears the deformation stress of the surrounding rock transmitted by the initial branch, and the stress is basically stable after 50 days of the secondary lining. The stress between the primary lining and the secondary lining is larger on the right side than on the left, and the initial strain of the secondary lining concrete is tensile strain, and with the increase of time, the concrete strain changes to the compressive strain stage and gradually deforms and stabilizes. The comprehensive monitoring results show that the monitoring values are within the range of the safety values specified in the code and the secondary lining structure of the shallow buried bias tunnel is stable and reliable.
【作者单位】：中国路桥工程有限责任公司;交通运输部科学研究院;新疆交通运输工程质量监督局;
【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
【分类号】：U455.91

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