MEASUREMENT OF MOVEMENTS OF EMBANKMENT DAMS

Early methods used in the measurement of movements of embankment dams are outlined and recent work in this area is reviewed. In internal measurements, instruments which are completely buried are usually more successful in machine-placed fill than those with connections which are brought up to the surface and have to be extended as the fill is raised. A guage is described which consists of a buried container connected by three flexible plastic tubes, laid in a trench across the fill, to an instrument house. A remote-reading settlement gauge is outlined which can be buried in trenches during construction. Other instruments described include USBR cross-arm settlement gauge, rod or cable gauges and horizontal plate gauges. Details are given of external measurements. Surveying by triangulation, electronic distance-measuring instruments, the Mekometer, the inverted pendulum and the arrangement of reference pillars are other aspects reviewed. The rate of horizontal movement is discussed and an approach to the problem is suggested which relates lateral movements of the embankment slopes to the amount of fill placed on the embankment which has caused the movement. The rates of lateral movement for the downstream slopes of several dams are tabulated. Where the stability of an embankment slope is in question, the measurement of lateral deformation as construction proceeds seems a practical method of assessing the nearness of an unsafe condition. Recommendations relating to internal and external measurements are presented.

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 57-68

Subject/Index Terms

Filing Info

  • Accession Number: 00263194
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Nov 12 1974 12:00AM