Influence of injection remediation on dynamic behaviors of a high-speed railway track-subgrade system
BIAN Xuecheng1,2, LI Shuhao1,2, WAN Zhangbo1,2, CHEN Yunmin1,2
1. Institute of Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China;
2. Key Laboratory of Soft Soils and Geoenvironmental Engineering of the Ministry of Education, Zhejiang University, Hangzhou 310058, China
Abstract:Mud pumping is a common disease of railway subgrade in rainy regions. The loss of soil particles leads to the gaps of roadbed, adversely affecting the safe operation of trains. Injection with polymer materials is an effective method for subgrade remediation, but further study is needed on influence of injection remediation on dynamic behaviors of high-speed railway track-subgrade system. Based on the full-scale model tests of ballastless track-subgrade, mud pumping under train moving loads could be repeated in the laboratory, and injection remediation test was also carried out to study changes of dynamic behaviors of track-subgrade. The results show that when subgrade suffers mud pumping, local cavity underneath concrete base also intensifies the vibration of track slab when the train passes at low speed, and the vibration velocity of track slab caused by high-speed train loads increased to 2.6 times compared with normal condition. It is found that the injection material fills the interspace between concrete base and subgrade after injection remediation, which reduces the vibration velocity of track structure. Further numerical analyses show that when the elastic modulus of the filler created by injection reaches between 5×104 and 1×106Pa, the abnormal vibration of track slab can be improved effectively. The vibration velocity of track slab increases with the length of injection area, therefore the reasonable treatment zone should be determined by the actual mud pumping area.
边学成1,2,李书豪1,2,万章博1,2,陈云敏1,2. 路基注浆对高速铁路轨道-路基体系动力特性的影响[J]. 振动与冲击, 2022, 41(4): 294-302.
BIAN Xuecheng1,2, LI Shuhao1,2, WAN Zhangbo1,2, CHEN Yunmin1,2. Influence of injection remediation on dynamic behaviors of a high-speed railway track-subgrade system. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(4): 294-302.
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