The use of explosives for the displacement of bogs under embankments to create solid foundations for the latter is analogous to the method of shaping excavations in hard rock or to the use of displacement blasting in marshes. The difference is that here at the moment of the explosion the muddy material is displaced sideways and the embankment settles simultaneously under its own weight into the space vacated. Parameters for the blasting work are as follows: length of the explosive charge, lc = h = thickness of the boggy layer under the embankment; diameter of the charge, DC = 10 to 12 cm weight of the explosive charge in kg: Q = 1/4 (pi delta), with delta=density of explosive in kg/dm3; distance delta between charges, a = 30 DC. In some cases it is sufficient to settle just the slopes and not the whole embankment on to the bed of the bog. Then drillings are made at the sides of the embankment and packed with explosive, and the detonation of these charges beneath the slopes displaces material so that the bases of those slopes settle at the bottom of the bog. In such a case the depth of the drillings and the space between them are both equal to the depth of the bog, the weight of the explosive charge in kg being q = 1/3 h3q, where q = 0.7 to 0.95 kg/m3, the diameter of the explosive charge is given by d2c = 4 q/pi H delta. /TRRL/


  • Spanish

Media Info

  • Features: Figures; References;
  • Pagination: p. 9-12
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00196704
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Sep 29 1979 12:00AM