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| 30 deg. | 30 | ______________|________|________|________|____________| ____________________________________________________________________ | | | | | | Combined | | | | | | assumed | _h_ | _l_ | [phi] | _D_{E}_ | _D_{W}_ | conditions. | | | | | | ______________|________|________|________|____________|____________| | | | | | | I_{3} | 20 | 30 | 50 deg. | 40 | 60 | I_{4} | 20 | 30 | 40 deg. | 40 | 60 | II_{3} | 15 | 15 | 50 deg. | 40 | 60 | II_{4} | 15 | 15 | 40 deg. | 40 | 60 | III_{3} | 15 | | 50 deg. | 15 | 15 | III_{4} | 15 | | 40 deg. | 15 | 15 | IV_{3} | 30 | | 50 deg. | 30 | 30 | IV_{4} | 30 | | 40 deg. | 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. foot, at | | | | || | | | __________|______|______|______|_________||______|______|______|_________ | | | | || | | | A | 3,240| 3,690| 1,500| 5,190 || 2,325| 2,880| 2,250| 5,130 B | 2,745| 3,105| 1,500| 4,605 || 1,845| 2,385| 2,250| 4,635 C | 2,160| 2,475| 1,500| 3,975 || 1,350| 1,800| 2,250| 4,050 D | 450| 540| 1,500| 2,040 || 450| 450| 2,250| 2,700 E | 360| 360| 1,625| 1,985 || 450| 450| 2,438| 2,888 F | 270| 270| 1,750| 2,025 || 450| 360| 2,626| 2,986 G | 225| 225| 1,875| 2,100 || 360| 270| 2,814| 3,084 __________|______|______|______|_________||______|______|______|_________ _________________________________________________________________________ | | | | ||
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