A computational method for post-construction settlement of high-speed railway bridge pile foundation considering soil creep effect

Abstract

Based on reasonable assumptions that simplified the calculational model, a simple and practical method was proposed to calculate the post-construction settlement of high-speed railway bridge pile foundation by using the Mesri creep model to describe the soil characteristics and the Mindlin-Geddes method considering pile diameter to calculate the vertical additional stress of pile bottom. A program named CPPS was designed for this method to calculate the post-construction settlement of a high-speed railway bridge pile foundation. The result indicates that the post-construction settlement in 100 years meets the requirements of the engineering specifications, and in the first two decades, the post-construction settlement is about 80% of its total settlement, while the settlement in the rest eighty years tends to be stable. Compared with the measured settlement after laying railway tracks, the calculational result is closed to that of the measured, and the results are conservative with a high computational accuracy. It is noted that the method can be used to calculate the post-construction settlement for the preliminary design of high-speed railway bridge pile foundation.

Keywords

high-speed railway / bridge pile foundation / post-construction settlement / Mesri creep model / simplified computational method

References

[1] XinX-z, WeiL-m, HeQ, ZhangQ, GuoZ-gangThe key science and technology research project of ministry of railways: New construction technique report at the deep soft soil section of hang-yong railway passenger dedicated line (III) [R], 2011, Changsha, Central South University: 4-5

[2] WeiD-guo. Visco-elastic load transfer models foraxially loaded piles [J]. International Journal for Numerical and Analytical Methods in Geomechanics, 2000, 24: 135-163

[3] ChunY-z, WuM-l, GuoY-zheng. Calculation and analysis for the time-dependency of the single-driven pile in double-layered soft clay [J]. Applied Clay Science, 2013, 79: 8-12

[4] SmallJ C, LiuH L S. Time-settlement behaviour of piled raft foundations using infinite elements [J]. Computers and Geotechnics, 2008, 35: 187-195

[5] ChenR P, ZhouW H, ChenY M. Influence of soil consolidation and pile load on the development of negative skin friction of pile [J]. Computers and Geotechnics, 2006, 36: 1265-1271

[6] WuW-b, WangK-h, ZhangZ-q, ChinJ-leo. A new approach for time effect analysis of settlement for single pile based on virtual soil-pile model [J]. Journal of Central South University, 2012, 19: 2656-2662

[7] AbbasJ M, ChikZ H, TahaM R, ShafiquS M. Time-dependent lateral response of pile embedded in elasto-plastic soil [J]. Journal of Central South University of Technology, 2010, 17: 372-380

[8] ChengZ-h, ChenY-m, XiaJ-zhong. Time effect of settlement for single under vertical sustained loading [J]. Rock and Soil Mechanics, 2006, 27(9): 1571-1574

[9] ZengQ-y, ZhouJ, QuJ-tong. Method for long-term settlement prediction of pile-foundation in consideration of time effect of stress-strain relationship [J]. Rock and Soil Mechanics, 2005, 26(8): 1283-1287

[10] ZhouJ, ZengY-qing. A simplified Calculation method for settlement of pile base caused by the creep of Soil under the pile [J]. Underground Space, 2004, 24(3): 298-300

[11] MesriG, FebresC E, ShieldsD R, CastroA. Shear-stress-strain-time behavior of clays [J]. Geotechnique, 1981, 31(4): 537-552

[12] ZhangQ-q, ZhangZ-miao. A simplified nonlinear approach for single pile settlement analysis [J]. Canadian Geotechnical Journal, 2012, 49(11): 1256-1266

[13] SinghA, MitchellJ K. General stress-strain-time function for soils [J]. J Soil Mech, ASCE, 1968, 94(1): 21-46

[14] KondnerR L. Hyperbolic stress-strain response: Cohesive soils [J]. Journal of Soil Mechanics and Foundations, American Society of Civil Engineers, 1963, 89(1): 115-143

[15] LiJ-s, SunJun. Mesri creep model for Shanghai silt-clay [J]. China Civil Engineering Journal, 2001, 34(6): 74-79

[16] MindlinR D. Force at a point in the interior of a semi-infinite solid [J]. Physics, 1936, 7(5): 195-202

[17] GeddesJ D. Tables for the calculation of stress in a semi-infinite medium due to vertical subsurface loading [J]. Geotechnique, 1966, 16(3): 231-255

[18] JanK, AlessandroP. Proposal of the Boltzmann-like superposition principle for nonlinear tensile creep of thermoplastics [J]. Ploymer Testing, 2008, 27: 596-606