Original scientific paper

https://doi.org/10.17559/TV-20220802045029

Cumulative Deformation Analysis of Foundation of Mined-Out Areas under Dynamic Loading - a Case Study of Taijiao High-Speed Railway

Kunpeng Shi ; School of Civil Engineering, Henan Polytechnic University, No. 2001 Century Avenue, Jiaozuo, Henan Province, 454003, China
Shuren Wang orcid.org/0000-0001-5490-2825 ; 1) International Joint Research Laboratory of Henan Province for Underground Space Development and Disaster Prevention, Henan Polytechnic University, China 2) School of Minerals and Energy Resources Engineering, University of New South Wales, Sydney, NSW 2052, Australia 3) State Collaborative Innovation Center Coal Work Safety and Cleanefficiency Utilization, Henan Polytechnic University, China No. 2001 Century Avenue, Jiaozuo, Henan Province, 454003, China
Yubo Chen ; School of Civil Engineering, Henan Polytechnic University, No. 2001 Century Avenue, Jiaozuo, Henan Province, 454003, China
Wenfu Yang ; Shanxi Provincial Key Lab of Resources, Environment and Disaster Monitoring, Coal Geological Geophysical Exploration Surveying & Mapping Institute of Shanxi Province, No. 380 Yingbin West Street, Jinzhong, Shanxi Province, 030600, China
Chunliu Li ; School of Urban Construction, Hebei Normal University of Science and Technology, No. 360 Hebei West Street, Qingdao, Hebei Province, 066004, China

Abstract

Since there is a safety risk of cumulative deformation exceeding the limit when high-speed rail passes through the mined-out areas, for the special needs of risk control along the high-speed railway, taking the foundation of the mined-out areas of Dianshang coal mine under Taijiao high-speed railway as the background, the mechanical model of rotation structure of key block was established. The stability criterion of fracture structure rock of the mined-out area was proposed. Using self-developed similar model test and dynamic loading device, the evolution characteristics and deformation mechanism of foundation of the mined-out areas under long-term dynamic loading of the high-speed railway were analyzed. Results show that when the number of loading vibration exceeds 5 million times, the foundation of the mined-out areas will occur over all settlement and deformation. The cumulative deformation of the foundation in different buried depths has similar variation law with the increasing of excitation and all experience three stages: the slow growth stage, the fast growth stage, and the stable stage. The prediction model of cumulative deformation of the foundation of the mined-out areas with different damage degrees under the long-term dynamic loading was proposed. The model parameters are closely related to the damage degree of foundation of the mined-out areas. The conclusions obtained in this study provide a theoretical basis for the prediction and control of the cumulative deformation of the foundation of the mined-out areas under the dynamic loading of high-speed railway.

Keywords

cumulative deformation; dynamic loading; foundation; high-speed railway; mined-out areas

Hrčak ID:

294404

URI

https://hrcak.srce.hr/294404

Publication date:

26.2.2023.

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