Analysis on mechanical characteristics of CRTSII slab ballastless track structures in rectification considering material brittleness

Zeng, Zhiping; Ye, Mengxuan; Wei-dong, Wang; Liu, Jing; Shen, Shiwen; Qahtan, Ayoub Abdullah Senan

doi:10.1016/j.conbuildmat.2021.126058

Cited by 9 publications

(1 citation statement)

References 13 publications

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“…However, its application in red-bedded soft rock foundation reinforcement has rarely been reported, and its feasibility needs to be further studied. Furthermore, as an extremely strict requirement for the allowable deformation of ballastless track of China high-speed railway is stated as only 4.0 mm [12,18,19], controlling the subgrade heave has become an urgent engineering problem in the construction of high-speed railway in red-bedded soft rock areas. The construction side for the treatment of uneven subgrade heave is relatively small, and it is necessary to ensure the train operation, hence, there is a need to limit disturbance of adjacent subgrade during the reinforcement process.…”

Section: Introductionmentioning

confidence: 99%

Study on Anti-Uplift Effect of Micro-Steel-Pipe Pile on Red-Bedded Soft Rock Subgrade

et al. 2022

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To investigate the treatment effect of micro-piles on uplift deformation of red-bedded soft rock subgrade, an in-situ static load test of slurry injected steel pipe micro-piles with different length was carried out, the uplift bearing capacity and deformation characteristics of micro-piles were analyzed, and the load transfer function of pile lateral friction resistance was modified with the consideration of pile length. A numerical simulation method considering the variable shear stiffness at the pile-soil interface was established, and the inversion of the relevant material parameters was carried out based on the in-situ test results. Through numerical simulation, the effect of single piles with different pile lengths and group piles with different pile spacing on the treatment of the uplift deformation of the subgrade was investigated. Finally, the anti-uplift design method of micro-piles in red-bedded soft rock was proposed. The results show that the uplift bearing capacity increased nonlinearly with the increase in pile length, and the variation curve of pile lateral friction resistance with pile-soil relative displacement showed a hardened type. The predicted pile lateral friction resistance shows a good correlation with the measured result; all the correlation coefficients were greater than 0.81. The uplift deformation of subgrade without piles was radially distributed with the maximum value of 5.12 mm as the center. A single micro-pile with a length of 7 m or a rectangular array of group piles with a length of 7 m and a spacing of 3D could effectively decrease the maximum uplift deformation to less than 4.0 mm, which can meet the requirement of specification. Thus, the micro-piles could be used for controlling the uplift deformation of red-bedded soft rock subgrade, and this study can provide a reference for anti-uplift design in the distributed area of red-bedded soft rock.

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Section: Introductionmentioning

confidence: 99%