Buy article PDF
The purchased file will be sent to you
via email after the payment is completed.
US$ 35
|
Geomechanics and Engineering Volume 35, Number 6, December25 2023 , pages 627-636 DOI: https://doi.org/10.12989/gae.2023.35.6.627 |
|
|
|
The influence of fine particle migration on pore structure of overlying ballast under cyclic loading |
||
Yu Ding, Yu Jia, Zhongling Zong, Xuan Wang, Jiasheng Zhang and Min Ni
|
||
| Abstract | ||
| The essence of subgrade mud pumping under train load is the migration of fine particles in subgrade soil. The migration of fine particles will change the pore structure of overlying ballast, thus affecting the mechanical properties and hydraulic properties of ballast layer. It is of great theoretical significance and engineering value to study the effect of fine particle migration on the pore structure of ballast layer under cyclic loading. In this paper, a tailor-made subgrade mud pumping test model and an X-ray computed tomography (CT) scanning equipment were used to study the influence of migration of fine particles in subgrade soil on the pore parameters (plane porosity, volume porosity, pore distribution and pore connectivity) of overlying ballast under cyclic loading. The results show that the compression of ballast pores and the blockage of migrated fine particles make the porosity of ballast layer decreases gradually. And the percentage of small pores in ballast layer increases, while the percentage of large pores decreases; the connectivity of pores also gradually decreases. Based on the test results, an empirical model of ballast porosity evolution under cyclic loading is established and verified. | ||
| Key Words | ||
| cyclic loading; empirical model of porosity evolution; fine particle migration; pore connectivity; pore size distribution; porosity | ||
| Address | ||
| Yu Ding: School of Civil and Ocean Engineering, Jiangsu Ocean University, Lianyungang, Jiangsu, 222005, China; Jiangsu Ocean Engineering Research Center for Intelligent Infrastructure Construction, Lianyungang, Jiangsu, 222005, China; School of Civil Engineering, Central South University, Changsha, Hunan 410083, China Yu Jia: School of Civil Engineering, Central South University, Changsha, Hunan 410083, China Zhongling Zong: School of Civil and Ocean Engineering, Jiangsu Ocean University, Lianyungang, Jiangsu, 222005, China; Jiangsu Ocean Engineering Research Center for Intelligent Infrastructure Construction, Lianyungang, Jiangsu, 222005, China Min Ni: School of Civil and Ocean Engineering, Jiangsu Ocean University, Lianyungang, Jiangsu, 222005, China | ||