, and are given in [Table 7].
TABLE 7.
 , inpounds per square foot. |  , infeet. |  |  , in pounds per squarefoot. |  , in pounds per squarefoot. | ||
|---|---|---|---|---|---|---|
 |  | | | |||
| (1) | (2) | (3) | (4) | (5) | (6) | (7) |
| 100 | 15 | 30° | 740 | 1 790 | 410 | 1 000 |
| 100 | 30 | 30° | 1 790 | 3 900 | 1 000 | 2 160 |
| 100 | 15 | 45° | 830 | 2 010 | 240 | 570 |
| 100 | 30 | 45° | 2 010 | 4 370 | 570 | 1 250 |
| 400 | 15 | 30° | 0 | 860 | 0 | 480 |
| 400 | 30 | 30° | 860 | 2 960 | 480 | 1 640 |
| 400 | 15 | 45° | 0 | 960 | 0 | 270 |
| 400 | 30 | 45° | 960 | 3 320 | 270 | 950 |
The pressures given in Columns 5 and 7 are intended to apply to a long section of a tunnel, those in Columns 4 and 6 refer to a short section about the heading. The values for
are intended to apply to what Mr. Meem styles “soft normally dry ground,” and it is hoped that he may approve the figures, as they are somewhere near his own. The coefficient,
, refers to hard consolidated ground. Here the pressure is 0 at the working faces of the 15-ft. tunnel. [Fig. 27] shows the variation in
