Analysis of the Behavior of Undrained Pore Water Pressure in Saturated Sand by Isotropic Loading Test

포화된 사질토에서 등방재하시험에 의한 비배수 공극수압의 거동분석

  • 임성훈 (공주대학교 산업과학대학 생물산업공학부)
  • Published : 2005.07.01


It is known in some literatures that the B value is not equal to unity in saturated soil when effective stress is given, in which the B Value is the ratio of measured excess pore water pressure and isometric loading pressure. In this study the B value was measured on various effective stresses and on various incremental loading stresses in various grain size of specimens with saturated sand. The test results showed that the B value was affected largely by grain size of sand in specimen and the amount of effective stress. There was the semi-logarithmic relationship between B value and effective stress, and also there was the linear relationship between the gradient of the former semi-logarithmic relationship and grain size of specimen.


  1. Eigenbrod, K. D., and J. P. Burak. 1990. Measurement of B-Values Less Than Unity for Thinly Interbedded Varved Clay. Geotechnical Testing Journal. ASTM. 13 (4): 370-374
  2. Terzaghi, K. 1923. Die berechnung der durchlassigkeitsziffer des tones aus dem verlauf der hydrodynamischen spannung-serscheinungen. Sitz, Akademie der Wissenschaften Part IIa 132: 125-138. Mathematish- Naturwissenschaftliche, Klasse, Vienna, Austria, Quoted by Terzaghi, K., R. B. Peck. and G. Mesri. 1996
  3. Terzaghi, K. 1936. The shearing resistance of saturated soils and the angles between the planes of shear. In Proc. of the 1st ICSMFE. Vol.1, 54-56. Cambridge, Mass
  4. Christie, I. F. 1964. A re-appraisal of merchant's contribution to the theory of consolidation. Geotechnique. ICE. 14 (4): 309-320
  5. Terzaghi, K., R. B. Peck, and G. Mesri. 1996. Soil Mechanics in Engineering Practice, Third Edition. :John Wiley & Sons
  6. Bishop, A. W. 1973. The influence of an undrained change in stress on the porepressure in porous media of low compressibility. Geotechnique ICE. 23 (3): 435-442
  7. Black, D. K, and K. L. Lee. 1973. Saturating laboratory samples by back pressure. J. of the Soil Mechanics and Foundation Division. ASCE. 99(SM1): 75-93
  8. Gibson, R. E., and K. Y. Lo. 1961. A theory of consolidation for soils exhibiting secondary compression. Acta Polytechnica Scandinavica, 296/1961, Ci 10. Reprinted by Norwegian Geotechnical Institute. quoted by Christie, I. F. 1964
  9. Bishop, A. W., and A. K. G. Eldin. 1950. Undrained triaxial tests on saturated sands and their significance in the general theory of shear strength. Geotechnique. ICE. 2 (1) : 13-32
  10. ASTM D4767 -04. 2005. Standard test method for consolidated undrained triaxial compression test for cohesive soils
  11. Skempton, A. W. 1954. The Pore Pressure Coefficients A and B. Geotechnique. ICE. 4(4): 143-147
  12. Eam, S. H. 2003. The behavior of undrained pore water pressure in normally consolidated and saturated clay(II) - visco elastic analysis model. J. of the Korean Society of Agricultural Engineers. 45(4): 137-143. (in Korean)
  13. Earn, S. H., and D. W. Lee. 2003. The behavior of undrained pore water pressure in normally consolidated and saturated clay (I) - analysis by isotropic loading test. J. of the Korean Society of Agricultural Engineers. 45 (4): 126-136. (in Korean)
  14. Mesri, G., K Adachi., and C. R. Ullrich. 1976. Pore-pressure response in rock to undraind change in all-round stress. Geotechnique. ICE. 26 (2): 317-330