THE EFFECT OF ENVIRONMENT ON THE PORE WATER TENSION UNDER SEALED SURFACES

THIS PAPER CONSIDERS THE FACTORS CONTROLLING THE PORE WATER TENSION IN SOILS UNDER SEALED SURFACES SUCH AS ROADS AND BUILDINGS WITH PARTICULAR REFERENCE TO TROPICAL CONDITIONS. FOR WATER-TABLE DEPTHS DOWN TO 3 FT IN SANDS AND 20 FT IN CLAYS THE PORE WATER TENSION IN ROAD SUBGRADES FOLLOWS A NORMAL HYDROSTATIC GRADIENT FROM THE LEVEL OF THE WATER TABLE. WITH DEEPER WATER TABLES, THE PORE WATER TENSION IS AFFECTED BY WATER MADE DIRECTLY AVAILABLE AS SURFACE RUNOFF AT THE EDGE OF THE COVERED AREA AND EVAPO- TRANSPIRATION FROM VEGETATION. THE PAPER CONSIDERS THE EFFECTS OF CLIMATE, VEGETATION, AND GROUND SLOPE INTERACTING WITH THE SOIL PERMEABILITY TO INFLUENCE THE PORE WATER TENSION IN ROAD SUBGRADES IN THE TROPICS. SUPPORTING DATA ARE GIVEN FROM MEASUREMENTS MADE IN EAST AND WEST AFRICA. FINALLY THE ESTIMATION OF CRITICAL MOISTURE CONDITIONS FOR DESIGN PURPOSES IS DISCUSSED AND RECOMMENDATIONS MADE. /RRL/A/

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Filing Info

  • Accession Number: 00233807
  • Record Type: Publication
  • Source Agency: Road Research Laboratory /UK
  • Files: TRIS
  • Created Date: Apr 1 1994 12:00AM