槽口桩竖向承载特性模型试验与计算分析

doi:10.13229/j.cnki.jdxbgxb.20231082

Abstract

Abstract:

Aiming at the bearing characteristics of slotted pile under vertical load， the difference of load bearing performance and failure mode of soil around pile of ordinary pile and slotted pile were analyzed through laboratory model test and a discrete element simulation analysis model respectively， and the influence of pile-forming technology on shear strength of soil at the side of slotted pile was also discussed. The results show that the ultimate bearing capacity of notched pile is 1.4 times that of the ordinary pile， and the material utilization rate is 1.9 times that of the ordinary pile. The pile end resistance sharing ratio of slotted pile and ordinary pile is 30.3 % and 64.9 %， which mainly shows the bearing characteristics of the end bearing friction pile and friction end bearing pile. There are obvious end bearing effect and soil squeezing effect at the slot， the side friction of pile is greatly affected by the shear force between soils， and the plastic failure surface from the top of pile to the end of pile is continuously fluctuating. Considering the design of the structure parameters of the slotted pile， the phenomenon of stress superposition or independent load failure between the slots should be avoided， and the optimal ratio between slot distance and pile diameter h/D is 1.06-1.46. The earth pressure theory of Terzaghi and Peck and the stress path method are used to show that The shear strength of soil on the side of the pile is significantly improved by extrusion and expansion process for forming holes.

Key words: foundation treatment, slotted pile, model test, load transfer, discrete element simulation, displacement field, failure surface

CLC Number:

TU473

You-sheng DENG,Zhi-gang YAO,Ya-feng GONG,Zhong-ju FENG,Long LI,Ke-qin ZHANG. Model test and calculating analysis on vertical bearing mechanism of slotted pile[J].Journal of Jilin University(Engineering and Technology Edition), 2025, 55(7): 2308-2319.

Figures/Tables 16

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桩号	桩长L/mm	外径D/mm	内径d/mm	变径比d/D	槽距h/mm	距径比 h/D
S1	800	50	-	-	-	-
S2	800	50	40	0.8	62	1.24
S3	800	50	30	0.6	62	1.24
S4	800	50	35	0.7	89	1.78
S5	800	50	35	0.7	73	1.46
S6	800	50	35	0.7	62	1.24

参数		取值
颗粒	密度/（kg·m^－3）	2 200
	法向和切向刚度比/（N·m^－1）	1.9×10⁶
	摩擦因数	0.36
	局部阻尼	0.7
桩和墙体	法向和切向刚度比/（N·m^－1）	1.9×10⁶
	摩擦因数	0.3
	密度/（kg·m^－3）	2 650

Model test and calculating analysis on vertical bearing mechanism of slotted pile

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