. The Bell System technical journal . e| = MEASURED STRAINS [iN/In] E= 10X10* PSI Fig. 7 — Moment distribution in ;i thin wnllcd tul)e, usiiij^ clay hnckfiil. STRENGTH llEQUIREMENTS FOR ROUND CONDUIT 747 depends on the characteristics of the undisturl)ed soil. A comparison ofthe values obtained from a 5-inch wide trench dug in sandy clay (typicalChester, N. J. soil) and trenches between 18 and 30 inches wide showsthat the values for 5-inch width are greater than for an 18- to 30-inchwidth when using sand backfill, and less when using clay backfill. (Text continued on page 750) SAND BACKFILL 4
. The Bell System technical journal . e| = MEASURED STRAINS [iN/In] E= 10X10* PSI Fig. 7 — Moment distribution in ;i thin wnllcd tul)e, usiiij^ clay hnckfiil. STRENGTH llEQUIREMENTS FOR ROUND CONDUIT 747 depends on the characteristics of the undisturl)ed soil. A comparison ofthe values obtained from a 5-inch wide trench dug in sandy clay (typicalChester, N. J. soil) and trenches between 18 and 30 inches wide showsthat the values for 5-inch width are greater than for an 18- to 30-inchwidth when using sand backfill, and less when using clay backfill. (Text continued on page 750) SAND BACKFILL 4 LOADING CONDITION i F= 10,000 LBS 18 CLAY. ei= MEASURED STRAINS [iN/INJE • IOxlO« PS I Fig. 8 — Moment distribution in a thin-walled tube, using sand backfill. 748 THE BELL SYSTEM TECHNICAL JOURNAL, MAY 1957 LOADING CONDITION lOOOLBS OODEN BOX
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
