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Weathering potential index for rocks based on density and porosity measurements

  • R. Pratap Singh
  • Vijay Kumar Upadhyay
  • Asok Das
Article
  • 114 Downloads

Abstract

Rock samples belonging to ten lithological types under different stages of weathering, were collected from different stratigraphical horizons at Bhagalpur. Their densities and porosities were determined experimentally and the data obtained were fitted empirically in a linear equation for each lithological type. The slopes of the curves, which were negative in each case, showed that the increase in porosity for the same decrease in density were in the order, white sandstone > ferruginous sandstone > white claystone > porphyritic gneiss > quartzite > pegmatite > amphibolite ≅ biotite gnejss > basalt ≅ dolerite. A new weathering potential index based on the density-porosity data was proposed and the values for a specific stage of weathering for all the lithological types studied fall within the same range.

Keywords

Weathering classification weathering potential index rock density rock porosity 

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References

  1. Branner G C 1937 Sandstone porosities in palaeozoic region in Arkansas;Bull. Am. Assoc. Petr. Geol. 31 67–79Google Scholar
  2. Chatterjee S R and Sengupta D K 1980 Structural and petrological evolution of the rocks around Jamua-Kakwara of Satpura orogeny Bhagalpur district, Bihar;J. Geol. Soc. India. 21 171–182Google Scholar
  3. Daly R A, Manger G E and Clark S R 1966 inPhysical constants (ed.) S P ClarkGeol. Soc. Am. Mem. 97 19–27Google Scholar
  4. Davis D H 1954 Estimating porosity of sedimentary rocks from bulk density;J. Geol. 62 102–107CrossRefGoogle Scholar
  5. Fairbairn H W 1943 Packing in ionic minerals;Bull. Geol. Soc. Am. 54 1305–1374Google Scholar
  6. GSL 1970 Geological Society London. Engg Group Working Party;Q. J. Geol. 3 1–24CrossRefGoogle Scholar
  7. Grant W H 1969 Abrasion pH—an index of weathering;Clays Clay. Miner. 17 151–155CrossRefGoogle Scholar
  8. ISI 1952 Indian Standard Institution specifications for coarse and fine aggregates from natural sources for concrete, IS-383Google Scholar
  9. ISI 1974 Indian Standard Institution Methods of tests for determination of water absorption, apparent specific gravity and porosity of natural building stones, IS-383Google Scholar
  10. Krishnan M S 1968Geology of India and Burma (Madras: Higginbothams) pp 81–82Google Scholar
  11. Legget R F and Karrow P F 1983Handbook of geology in civil engineering (New York: McGraw Hill Co) pp 5–9Google Scholar
  12. Patton F D and Deere D U 1970 inHandbook on mechanical properties of rocks (eds) R D Lama and V S Vutukuri (Clausthal, Germany: Trans Tech Publishers) pp 271–272Google Scholar
  13. Punmia B C 1977Soil mechanics and foundations (Delhi: Standard Book House) pp 12–17Google Scholar
  14. Ramana Y V and Venkat Narayana 1971 An air porosimeter for porosity of rocks;Int. J. Rock. Mech. Min. Sci. 8 2953CrossRefGoogle Scholar
  15. Reiche P 1943 Graphic representation of the chemical weathering;J. Sed. Petrol. 13 58–63Google Scholar
  16. Roychoudhary P C 1962Bihar district gazetteer (Bhagalpur) (Patna: Secretariat Press) pp 6–10Google Scholar
  17. U S Task Committee 1972 Foundation Design Manual, Am. Soc. Civ. Eng.;J. Soil. Mech. Found. Eng. 98 557Google Scholar

Copyright information

© Indian Academy of Sciences 1987

Authors and Affiliations

  • R. Pratap Singh
    • 1
  • Vijay Kumar Upadhyay
    • 1
  • Asok Das
    • 1
  1. 1.Bhagalpur College of EngineeringBhagalpurIndia

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