التفاصيل البيبلوغرافية
| العنوان: |
Research on Crack Growth of Double-block Ballastless Track Roadbed Slab Under the Action of Groundwater in High-speed Railway Tunnel. (English) |
| المؤلفون: |
LIU Chengkun, CHEN Jinjie, HUANG Shougang, WANG Rui, CHEN Long, LI Yang |
| المصدر: |
Railway Standard Design; Feb2024, Vol. 68 Issue 2, p39-51, 7p |
| مصطلحات موضوعية: |
FRACTURE mechanics, HIGH speed trains, TUNNELS, WATER pressure, CONSTRUCTION slabs, ACOUSTIC emission testing |
| مستخلص: |
Aiming at the problem of bed plate cracking during the construction of CRTS I double-block ballastless track in high-speed railway tunnels in China, a three-dimensional solid model of tunnel and ballastless track is established by using finite element software. The change law of displacement and uplift of each structure layer of ballastless track in tunnel under the action of groundwater is studied. Combined with FRANC3D software, prefabricated three-dimensional cracks of different shapes are inserted into the most stressed position of the roadbed slab structure, and the influence of water pressure and crack length on the crack growth of the roadbed slab is analyzed. The results show that: ( 1) Although the displacement uplift of the roadbed slab is somewhat decreased when the triangular load is applied compared with the uniform load, the repeated action of underground water pressure will always affect the track structure smoothness, and even lead to the separation of the track bed plate and the invert arch filling. (2) Crack length is the controlling factor of crack instability and growth. When the drainage system is completely blocked, it is recommended that the crack length be controlled within 200 mm. (3) Water pressure is the key influencing factor of crack growth. Under the same conditions, the larger the water pressure is, the more rapid the crack growth will be. The stress intensity factor at the tip of the crack of the roadbed slab under uniform load is 1.2~1.4 times of that under the corresponding triangular load. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
