Table 3. Comparison of the accuracy of...

Table 3.

Comparison of the accuracy of various bearing capacity models for footings on single stone columns

Designation	Observed load test data (Bergado and Lam, 1987)			Frikha and Bouassida (2014)		Modified Mitchell method		Modified Hughes and Withers method		Multiple linear regression model
	Friction angle, φ′: deg	q_u /c_u	q_u: kPa^a	q_u: kPa	Bias^b	q_u: kPa	Bias	q_u: kPa	Bias	q_u: kPa	Bias
G1	39·1	15·3	435	416	1·05	501	0·87	393	1·11	470	1·05
G2	38·4	14·3	404	404	1·00	501	0·81	380	1·06	470	0·98
G3	37·2	14·3	404	384	1·05	501	0·81	359	1·12	470	0·98
G4	37·0	14·3	404	381	1·06	501	0·81	356	1·13	470	0·98
G5	36·0	13·1	373	365	1·02	501	0·74	340	1·10	470	0·90
G6	37·6	13·1	373	391	0·95	501	0·74	366	1·02	470	0·90
G7	35·1	10·0	280	351	0·80	501	0·56	326	0·86	470	0·68
G8	36·2	10·0	280	368	0·76	501	0·56	343	0·82	470	0·68
G9	35·6	8·7	249	359	0·69	501	0·50	334	0·74	470	0·60
G10	37·4	14·2	404	388	1·04	501	0·81	363	1·11	470	0·98
G11	37·9	14·0	373	396	0·94	501	0·74	371	1·01	470	0·90
G12	42·5	15·3	435	481	0·90	501	0·87	464	0·94	470	1·05
G13	44·7	16·5	466	528	0·88	501	0·93	520	0·90	470	1·13
Mean					0·94						0·75	0·99	0·91
COV: %^c					13·00						17·70	13·20	17·70

Designation	Observed load test data (Bergado and Lam, 1987)			Frikha and Bouassida (2014)		Modified Mitchell method		Modified Hughes and Withers method		Multiple linear regression model
	Friction angle, φ′: deg	q_u /c_u	q_u: kPa^a	q_u: kPa	Bias^b	q_u: kPa	Bias	q_u: kPa	Bias	q_u: kPa	Bias
G1	39·1	15·3	435	416	1·05	501	0·87	393	1·11	470	1·05
G2	38·4	14·3	404	404	1·00	501	0·81	380	1·06	470	0·98
G3	37·2	14·3	404	384	1·05	501	0·81	359	1·12	470	0·98
G4	37·0	14·3	404	381	1·06	501	0·81	356	1·13	470	0·98
G5	36·0	13·1	373	365	1·02	501	0·74	340	1·10	470	0·90
G6	37·6	13·1	373	391	0·95	501	0·74	366	1·02	470	0·90
G7	35·1	10·0	280	351	0·80	501	0·56	326	0·86	470	0·68
G8	36·2	10·0	280	368	0·76	501	0·56	343	0·82	470	0·68
G9	35·6	8·7	249	359	0·69	501	0·50	334	0·74	470	0·60
G10	37·4	14·2	404	388	1·04	501	0·81	363	1·11	470	0·98
G11	37·9	14·0	373	396	0·94	501	0·74	371	1·01	470	0·90
G12	42·5	15·3	435	481	0·90	501	0·87	464	0·94	470	1·05
G13	44·7	16·5	466	528	0·88	501	0·93	520	0·90	470	1·13
Mean					0·94						0·75	0·99	0·91
COV: %^c					13·00						17·70	13·20	17·70

^a Assuming d_p = 32 cm (Bergado and Lam, 1987).

^b Defined as the ratio of the measured capacity and the predicted capacity.

^c Coefficient of variation: defined as the ratio of the standard deviation of the point bias and the mean bias.

Sharing Unavailable