Pressure, Resistance, and Stability of Earth - American Society of Civil Engineers: Transactions, Paper No. 1174, - Volume LXX, December 1910 by J. C. Meem
page 50 of 92 (54%)
page 50 of 92 (54%)
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III_{1} | 15 | | 45° | 15 |
III_{2} | 15 | | 30° | 15 | IV_{1} | 30 | | 45° | 30 | IV_{2} | 30 | | 30° | 30 | ______________|________|________|________|____________| ____________________________________________________________________ | | | | | | Combined | | | | | | assumed | _h_ | _l_ | [phi] | _D_{E}_ | _D_{W}_ | conditions. | | | | | | ______________|________|________|________|____________|____________| | | | | | | I_{3} | 20 | 30 | 50° | 40 | 60 | I_{4} | 20 | 30 | 40° | 40 | 60 | II_{3} | 15 | 15 | 50° | 40 | 60 | II_{4} | 15 | 15 | 40° | 40 | 60 | III_{3} | 15 | | 50° | 15 | 15 | III_{4} | 15 | | 40° | 15 | 15 | IV_{3} | 30 | | 50° | 30 | 30 | IV_{4} | 30 | | 40° | 30 | 30 | ______________|________|________|________|____________|____________| APPROXIMATE PRESSURES ON TUNNELS, PER SQUARE FOOT. _________________________________________________________________________ | | | | || | | | Pressure | I_{1}| I_{3}| I_{3}| I_{3} || I_{2}| I_{4}| I_{4}| I_{4} per square|Earth.|Earth.|Water.|Combined.||Earth.|Earth.|Water.|Combined. |
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