Numerical Analysis on the Bearing Capacity of Post-grouting Bored Pile under Vertical Load

doi:10.16183/j.cnki.jsjtu.2006.12.023

Abstract

Abstract:

An analysis model of post-grouting bored pile and soil was built up by numerical method to simulate the bearing capacity of the pile. The results of numerical analysis on the pile load tests are agreement with the measured ones. The effects of post-grouting on bearing capacity were simulated by this method with considering the grouting volume, the strength of grouted soil body, the height of turn-up grout and the improvement of skin friction. The results show that the grouting volume and the strength of grouting soil body have a limited effect on the bearing capacity, and the increasing effect of the grouting volume is also influenced by the length of pile. The height of turn-up grout and the improvement of skin friction have a great effect on the bearing capacity, which is linearly increased with the increasing of the height of turn-up grout and the improvement of lateral friction.

Key words: bored pile, post-grouting at pile bottom, numerical analysis, bearing capacity

CLC Number:

TU473.1

HUANG Ji-long, CHEN Jin-jian, WANG Jian-hua. Numerical Analysis on the Bearing Capacity of Post-grouting Bored Pile under Vertical Load[J]. Journal of Shanghai Jiao Tong University, 2006, 40(12): 2122-2125.

Figures/Tables 7

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Tab. 1

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References 5

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层序	地层名称	土层厚度/m	γ_s/(kN·m^-3)	e	E_s/MPa	c/kPa	φ/(°)	μ
①	杂填土	3.59	?	?	?	?	?	?
②	粘土	?	17.8	1.10	27.32	10	18.0	0.33
③₂	砂质粉土	2.60	18.6	0.82	18.38	4	15.0	0.27
③₃	淤泥质粉质粘土	2.00	17.4	1.19	18.38	4	24.8	0.46
④	淤泥质粘土	3.10	16.6	1.47	52.29	14	11.5	0.20
⑤_1-1	淤泥质粉质粘土	11.20	17.5	1.13	62.97	12	19.5	0.35
⑤_1-2	粘土夹粉质粘土	5.00	17.7	1.08	57.00	16	15.0	0.27
⑥	粉质粘土	4.00	19.4	0.73	39.50	46	16.5	0.30
⑦₁	砂质粉土	4.00	18.5	0.87	98.30	3	31.0	0.60
⑦₂	粉细砂	65.00	19.1	0.74	180.00	1	32.5	0.61

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