Test Study on Settlement Model of Ultra-Thick Backfill in High-Speed Railway Tunnel through Giant Karst Cave

被引：0
|
作者：
Wang J. [1 ,2 ,3 ]
Li X. [1 ,3 ]
Guo B. [1 ,3 ]
Ding G. [4 ]
Liu T. [2 ]
Sun Y. [5 ]
Yu M. [5 ]
机构：
[1] School of Civil Engineering, Shandong Jianzhu University, Jinan
[2] Postdoctoral Workstation, China Railway 14th Bureau Group Corporation Limited, Jinan
[3] Key Laboratory of Building Structural Retrofitting and Underground Space Engineering, Ministry of Education, Shandong Jianzhu University, Jinan
[4] Institute of Architectural Engineering, Wenzhou University, Wenzhou
[5] Qianjiang-Zhangjiajie-Changde Project Department, China Railway 14th Bureau Group Construction Engineering Co., Ltd., Jinan
来源：
Zhongguo Tiedao Kexue/China Railway Science | 2022年 / 43卷 / 04期
关键词：
Giant karst cave; High-speed railway tunnel; Settlement caused by dynamic load disturbance; Train dynamic load; Ultra-thick backfill; Vibration isolation;
D O I：
10.3969/j.issn.1001-4632.2022.04.09
中图分类号：
学科分类号：
摘要：
Based on the backfill treatment project of the high mountain tunnels passing through the giant karst cave at a high level on Qianjiang-Changde section of Chongqing-Xiamen HSR, a similar model test of the settlement of ultra-thick backfill under train dynamic load based on sequential loading method was designed according to the geometric similarity ratio of 1:5, in order to study the vibration isolation performance of reinforced concrete road base plates with different levels of thicknesses and the settlement law of the ultra-thick backfill of giant karst caves. The rationality of the treatment scheme for the backfill of giant karst caves was verified. The results show that as the thickness of the road base plate increases, the additional settlement for the invert surface layer of the tunnel model gradually decreases. Along with the increasing thickness, the disturbance of backfill sand layer caused by the train dynamic load gradually decreases, and the vibration isolation performance of the road base plate gradually increases. From the surface to the deep layer of backfill sand layer, both the vibration acceleration peak and the dynamic earth pressure value caused by the train dynamic load significantly decrease, and the propagation range of the dynamic earth pressure is gradually reduced. When the road base plate is 0.6 m thick, the dynamic load disturbance settlement within 50 cm of the shallow part in backfill sand layer is only 0.02 mm, which is equivalent to the settlement of 0.10 mm within 2.5 m of the shallow part in the backfill tunnel ballast layer in practical engineering. Over the first year of the tunnel operation, the overall settlement of the tunnel structure is less than 1 mm and tends to be stable. Therefore, the design scheme of the giant karst cave in high mountain tunnels using "ballast backfill + upper grouting"‍ treatment, supplemented by 3 m thick reinforced concrete road base plate vibration isolation is reasonable and reliable. © 2022, Editorial Department of China Railway Science. All right reserved.
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页码：84 / 95
页数：11
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