岩土力学2018，Vol.39Issue(3)：949-956,8.DOI:10.16285/j.rsm.2016.0589
破碎围岩重载铁路隧道基底结构动力特性现场试验研究
Field experimental study of basement structural dynamic properties of the heavy-haul railway tunnel in broken surrounding rock
摘要
Abstract
In this study,dynamic pressure response of base structure of Fu Yingzi tunnel along Zhangjiakou to Tangshan was simulated through field large-scale excitation test under the class Ⅴ rock conditions when the heavy haul trains with axle weights of 250 kN,270 kN,and 300 kN passed.Dynamic pressure attenuation values at measuring points were presented when axle weight was reduced.According to the earth pressure time history chart of field measurement,horizontal and vertical distributions of dynamic pressure of the measuring points in each structural plane were analyzed.The results indicate that dynamic pressure of each measuring point in heavy haul line of double line tunnel is greater than passenger train line,and the dynamic pressure of the corresponding measuring points below the railway track under different axle load of heavy haul trains is greater than other measuring points.Stress concentration is found to appear in the structure and surrounding rock at corresponding heave haul position,which is more likely to cause the structure to crack or hole generation in wall rock under the condition of broken rock compared with the test results on the surface of class Ⅳ grade surrounding rock.Train load attenuates drastically due to cushioning of the bed structure and inverted arch filling as it vertically transfers,but there is only small attenuation in inverted arch.Current designed basement structure thickness cannot meet the demand of lifting axle load.关键词
重载铁路/基底结构/现场试验/动力响应Key words
heavy-haul railway/base structure/field test/dynamic pressure response分类
交通工程引用本文复制引用
李自强,徐湉源,吴秋军,于丽,王明年,王子健..破碎围岩重载铁路隧道基底结构动力特性现场试验研究[J].岩土力学,2018,39(3):949-956,8.基金项目
中国铁路总公司科技研究开发计划课题合同(No.2014G005-A) （No.2014G005-A）
西南交通大学博士研究生创新基金.This work was supported by the Program of Science and Technology Department of China Railway Corporation (2014G005-A) and the Doctoral Innovation fund of Southwest Jiaotong University. （2014G005-A）
