Ultimate Capacity Analysis and Determination of the Position of Failure Surface for Uplift Piles

Table 1

Predicated and measured net uplift capacity of single pile.

L/d	Expt results (𝑁)	Meyerhof method [12]		Das method [13]		Chattopadhyay method [14]		Shanker method [4]		Truncated method [17]		Proposed method
		(𝑁)	relative error	(𝑁)	relative error	(𝑁)	relative error	(𝑁)	relative error	(𝑁)	relative error	(𝑁)	relative error
Das (1983) [13] expt results, 𝛾=15.79 kN/m^3, 𝜑=34^∘, 𝛿=30.5^∘, 𝑑=0.0254 m, 𝐷𝑟=47.6%
8	27	25.7	4.8%	25.7	4.8%	40.7	50.7%	22	18.5%	12.9	52.0%	35.9	33.0%
12	62	57.8	6.8%	57.4	7.4%	75.0	21.0%	62.5	0.8%	43.8	29.4%	53.4	13.8%
16	114	102.8	9.8%	92.8	18.6%	108.3	5.0%	133.0	16.6%	103.7	9.0%	126.3	10.7%
24	180	230.8	28.2%	163.2	9.3%	171.0	5.0%	202.2	12.2%	350.0	94.5%	193.6	7.5%
Chattopadhyay and Pise (1986) [14] expt results, 𝛾=16 kN/m^3, 𝜑=41^∘, 𝛿=34^∘, 𝑑=0.019 m
10.5	74	34.78	53.0%	34.8	53.0%	70	5.4%	23.5	68.2%	18.7	74.7%	49.7	32.8%
16	127	80.36	36.7%	79.65	37.3%	149.3	17.6%	82	35.4%	65.8	48.2	151.9	19.6%
26	256	217.2	15.2%	173.5	32.2%	298.3	16.5%	141.0	44.9%	292	14.1%	248.5	2.9%
Dash and Pise (2003) [16] expt results, 𝛾=16.4 kN/m^3, 𝜑=38^∘, 𝛿=29^∘, 𝑑=0.025 m, 𝐷𝑟=80%
8	47.6	33.9	28.8%	33.9	28.8%	57.2	20.1%	23	51.6%	16.3	65.7%	62.1	30.4%
16	142	135.6	4.5%	134	5.6%	166.2	17.0%	142	0.00%	130.3	8.2%	100.4	29.3%
24	271	305	12.5%	259	4.4%	262.5	3.1%	211	22.1%	439.7	62.3%	297.8	9.8%
Shanker et al. (2007) [4] expt results, 𝛾=15.8 kN/m^3, 𝜑=38^∘, 𝛿=26^∘, 𝑑=0.02 m, 𝐷𝑟=54.3%
10	17.3	29.3	69.4%	29.3	69.3%	35.7	106.4%	19.19	10.9%	15.7	9.2%	17.1	1.2%
20	112	117	4.5%	98.5	12.1%	86.3	22.9%	120.47	7.6%	125.5	12.1%	108.5	3.1%
30	181.6	266.5	46.8%	169	6.9%	127.2	30.0%	178.0	1.9%	423.5	133.2%	233.1	28.3%