Table 2. Active earth pressure...

Table 2.

Active earth pressure coefficients ${\bar{K}}_{a}$

Soil friction angle, ϕ: degrees	Backfill inclination, β: degrees	Wall inclination, α: degrees
Soil friction angle, ϕ: degrees	Backfill inclination, β: degrees	−20	−10	0	10	20
25	−10	0·4429	0·3693	0·3110	0·2622	0·2184
	0	0·5175	0·4212	0·3480	0·2893	0·2383
	10	0·6239	0·4982	0·4040	0·3309	0·2696
	20	0·8424	0·6531	0·5226	0·4216	0·3399
30	−10	0·3888	0·3132	0·2538	0·2043	0·1603
	0	0·4505	0·3542	0·2813	0·2231	0·1730
	10	0·5334	0·4112	0·3203	0·2502	0·1916
	20	0·6722	0·5077	0·3892	0·2989	0·2261
	30	1·3996	1·0217	0·7500	0·5773	0·4398
35	−10	0·3411	0·2648	0·2057	0·1574	0·1151
	0	0·3918	0·2970	0·2260	0·1701	0·1229
	10	0·4569	0·3394	0·2531	0·1875	0·1338
	20	0·5550	0·4042	0·2962	0·2157	0·1518
	30	0·7876	0·5446	0·3938	0·2818	0·1957
40	−10	0·2987	0·2229	0·1652	0·1191	0·0801
	0	0·3401	0·2479	0·1798	0·1276	0·0846
	10	0·3913	0·2792	0·1985	0·1385	0·0907
	20	0·4633	0·3241	0·2261	0·1550	0·1000
	30	0·6051	0·4042	0·2776	0·1865	0·1184
	40	1·3892	0·9094	0·5868	0·3974	0·2554

Soil friction angle, ϕ: degrees	Backfill inclination, β: degrees	Wall inclination, α: degrees
Soil friction angle, ϕ: degrees	Backfill inclination, β: degrees	−20	−10	0	10	20
25	−10	0·4429	0·3693	0·3110	0·2622	0·2184
	0	0·5175	0·4212	0·3480	0·2893	0·2383
	10	0·6239	0·4982	0·4040	0·3309	0·2696
	20	0·8424	0·6531	0·5226	0·4216	0·3399
30	−10	0·3888	0·3132	0·2538	0·2043	0·1603
	0	0·4505	0·3542	0·2813	0·2231	0·1730
	10	0·5334	0·4112	0·3203	0·2502	0·1916
	20	0·6722	0·5077	0·3892	0·2989	0·2261
	30	1·3996	1·0217	0·7500	0·5773	0·4398
35	−10	0·3411	0·2648	0·2057	0·1574	0·1151
	0	0·3918	0·2970	0·2260	0·1701	0·1229
	10	0·4569	0·3394	0·2531	0·1875	0·1338
	20	0·5550	0·4042	0·2962	0·2157	0·1518
	30	0·7876	0·5446	0·3938	0·2818	0·1957
40	−10	0·2987	0·2229	0·1652	0·1191	0·0801
	0	0·3401	0·2479	0·1798	0·1276	0·0846
	10	0·3913	0·2792	0·1985	0·1385	0·0907
	20	0·4633	0·3241	0·2261	0·1550	0·1000
	30	0·6051	0·4042	0·2776	0·1865	0·1184
	40	1·3892	0·9094	0·5868	0·3974	0·2554