Calculation Method of Pile Foundation Settlement Displacement Based on Virtual Column Equivalent Model

doi:10.16183/j.cnki.jsjtu.2020.383

Abstract

Abstract:

According to the engineering characteristics of pile foundation in soft soil layer, a virtual column structure model was proposed, and a theoretical solution to pile foundation settlement displacement was established. Besides, the load transfer characteristics of pile foundation in soft soil layer, the bearing mode of pile foundation, and its dynamic relationship with the gradual evolution of load and environmental conditions were studied. The results show that there are friction bearing and friction with pile end bearing modes in pile foundation, and they change significantly with pile top load, construction, and environmental factors. Affected by the load transfer law, there is a 0-axis force section in the axial direction of pile foundation. The relationship between the depth and the length of pile foundation affects the type of bearing mode and displacement calculation results. The field results verify the correctness and applicability of the theoretical method.

Key words: bearing mode of pile foundation, settlement displacement, virtual column equivalent model, theoretical solution

CLC Number:

TU473

WANG Rongyong, LIU Linqi, WANG Yingyi, HUANG Xingchun. Calculation Method of Pile Foundation Settlement Displacement Based on Virtual Column Equivalent Model[J]. Journal of Shanghai Jiao Tong University, 2021, 55(9): 1126-1133.

Figures/Tables 9

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References 13

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土体		桩基
参数	取值	参数	取值
ϕ/(°)	15	D/mm	900
C/kPa	30	H/m	76.6
μ	0.4	A/m²	0.63617
γ/(kN·m^-3)	1.81	E/GPa	30
E_s/MPa	10.0

土层名称	平均厚度/m	ϕ/(°)	E/MPa	C/kPa	γ/ (kN·m^-3)
黏土	2.00	17.50	3.00	34.00	19.1
淤泥	1.95	17.90	1.60	22.00	17.0
细砂	3.75	16.95	8.00	10.50	18.0
淤泥	15.70	10.25	2.00	20.35	17.1
细砂	4.20	16.95	10.00	10.50	18.0
淤泥质黏土	9.75	11.40	2.50	80.00	17.5
细砂	4.90	16.95	12.00	10.50	18.0
黏土	5.50	16.40	6.50	43.00	19.6
黏土	10.05	12.45	4.00	64.50	18.4
粉质黏土	14.45	17.35	6.00	41.50	19.1
卵石	12.10	20.00	18.50	0	18.5
按地层厚度加权平均		18	10	40	18.1

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