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《Journal of Vibration and Shock》 2015-16
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Testing research on critical cyclical stress of coarse-grained soil filling in heavy haul railway subgrade

LENG Wu-ming;LIU Wen-jie;ZHOU Wen-quan;School of Civil Engineering Central South University;  
The surface layer of heavy haul railway subgrade is mainly composed of coarse-grained soil( CGS). The accumulative deformation characteristic of CGS is a very important issue because the CGS directly supports the cyclical train loading transfered by upper structure. Previous researches reveal that critical cyclical stress ratio( CCSR) is a significant factor of accumulative deformation characteristic. By using a self-developed dynamic triaxial testing system,some sustained vibration tests were carried out on CGS with different confining pressures,dynamic stress amplitudes and water contents. Some curves of accumulative dynamic strain versus vibration times were obtained by the tests. The influences of confining pressure and water content on the increase of accumulative dynamic strain were discussed.Furthermore,the CCSR lines of CGS with different water contents were acquired. Finally,an empirical formula for calculating the critical cyclical stress was put forward.
【Fund】: 国家自然科学基金重点项目(U1361204);国家自然科学基金项目(51208518);; 中南大学研究生自主探索项目(2014ZZTS046)
【CateGory Index】: U213.1
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