Page 38 - Buried Pipe Design
P. 38

16   Chapter Two







                 H   H e




                         D                C


                                h
          H




                 H e
                               dh






                        A                  B

         s f  d c                                       s m + s g


            pB c

                                B c


                                                       s g

                                                   s f


                                (a)
         Figure 2.4 Comparison of positive projecting conduits: (a) Projection
         conditions; (b) ditch condition. r sd   [(S m   S g )   (S f   d c )]/S m ; r sd   set-
         tlement ratio; s m   compression of soil at sides of pipe; s g   settlement
         of natural ground surface at sides of pipe; s f   settlement of foundation
         underneath pipe; d c   deflection of the top of pipe. (Reprinted, by per-
         mission, from Spangler and Handy, Soil Engineering, 4th ed., Harper &
         Row, 1982.)
   33   34   35   36   37   38   39   40   41   42   43