. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools . \ Fig. 41. points {c and d) as will be determined by the required slopeangle (/?). The normal section in fill is as shown in Fig. 41. The pointsc and d are likewise determined by the intersection of the re- 104 §89. EARTHWORK, 105 quired side slopes with the natural surface. In case the requiredroadbed (ab in Fig. 42) intersects the natural surface, both cut. Fig. 42. and fill are required, and the points c and d are determined asbefore. Note that /? and /? are not necessarily
. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools . \ Fig. 41. points {c and d) as will be determined by the required slopeangle (/?). The normal section in fill is as shown in Fig. 41. The pointsc and d are likewise determined by the intersection of the re- 104 §89. EARTHWORK, 105 quired side slopes with the natural surface. In case the requiredroadbed (ab in Fig. 42) intersects the natural surface, both cut. Fig. 42. and fill are required, and the points c and d are determined asbefore. Note that /? and /? are not necessarily equal. Theirproper values will be discussed later. 89. Terminal pyramids and wedges. Fig. 43 illustrates thegeneral form of cross-sections when there is a transition fromcut to fill. ,g represents the grade line of the road which
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