Table 5 Determination of failure extent... | Emerald Publishing

Table 5

Determination of failure extent

Depth ratio, H/W	Actual depth, H: m	Measured surface half-failure extent, E/2: m	Angle, θ = tan⁻¹[H/(E/2)]: °	Ratio of failure extent to trapdoor width, E/W
1	6	4·50	53·1	1·50
2	12	8·50	54·7	2·83
3	18	12·5	55·2	4·17
4	24	17·5	53·9	5·83
5	30	20·5	55·7	6·83
6	36	25·5	54·7	8·50
7	42	30·5	54·0	10·17
8	48	35·0	53·9	11·67
9	54	36·5	55·9	12·17
10	60	41·5	55·3	13·83

Depth ratio, H/W	Actual depth, H: m	Measured surface half-failure extent, E/2: m	Angle, θ = tan⁻¹[H/(E/2)]: °	Ratio of failure extent to trapdoor width, E/W
1	6	4·50	53·1	1·50
2	12	8·50	54·7	2·83
3	18	12·5	55·2	4·17
4	24	17·5	53·9	5·83
5	30	20·5	55·7	6·83
6	36	25·5	54·7	8·50
7	42	30·5	54·0	10·17
8	48	35·0	53·9	11·67
9	54	36·5	55·9	12·17
10	60	41·5	55·3	13·83

Half-cavity size (W/2) = 3 m