EARTHQUAKE RESISTANT DESIGN CRITERIA FOR UNDERGROUND STRUCTURES

Proposed earthquake design criteria for pipelines and tunnels embedden in soft soil deposits are summarized. The following refer to design criteria for petroleum pipelines: (1) Internal petroleum pressures, earth pressures, vehicle loads, weight of petroleum, weight of pipes, seismic effects, effects of differential settlement of ground hydraulic pressures, bouyancy, and other loads shall be taken into account in earthquake design; (2) bearing capacities of specified saturated sandy soils, cohesive soils and soft silty soils shall be neglected; (3) equations are given which shall be used to determine the horizontal and vertical seismic coefficient at bedrock, the horizontal and vertical displacement of ground surface, and the axial stress in straight pipes buried in the soil layer; (4) shear wave velocities of soil layers shall be generally determined by field measurements or laboratory experiments, or when no measurements can be done, shear velocities may be determined in terms of N-value obtained by a standard penetration test; (5) four allowable stresses are specified, including the allowable tensile stress, the allowable compressive stress, the allowable shearing stress, and the allowable bearing stress; and (6) numerous equipments including a supervising device of operation, safety controlling devices, pressure gages, leakage meters, cutoff valves, removal systems of leaked petroleum, seismometers, dispatching systems, alarming systems, etc., shall be installed in the pipeline system. An interim draft of earthquake-resistant specifications for prefabricated submerged tunnels is referred to as containing the uniform standards presently used in Japan for the aseismic design of prefabricated tunnels embedded under the bottom of the sea.

Media Info

  • Features: Figures; Tables;
  • Pagination: p. 205-221

Subject/Index Terms

Filing Info

  • Accession Number: 00128524
  • Record Type: Publication
  • Report/Paper Numbers: Tech Memo #1023 Pt I
  • Files: TRIS
  • Created Date: May 14 1976 12:00AM