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CORRELATION OF IN-SITU MODULUS OF DEFORMATION DETERMINED BY DILATOMETER OR GOODMAN JACK WITH THE DEGREE OF WEATHERING O

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CORRELATION OF IN-SITU MODULUS OF DEFORMATION DETERMINED BY DILATOMETER OR GOODMAN JACK WITH THE DEGREE OF WEATHERING O

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    1. CORRELATION OF IN-SITU MODULUS OF DEFORMATION DETERMINED BY DILATOMETER OR GOODMAN JACK WITH THE DEGREE OF WEATHERING OF ROCK MASSES AND ROCK MASS RATING(RMR) Bo-An Jang and Hyoyeol Kim Division of Earth Sciences, Kangwon National University, Korea

    2. Introduction - Plate Loading Test Modulus of deformation Modulus of elasticity

    3. Modulus of Elasticity Property of intact rock Usually measured from specimen Lab tests - uniaxial compression test In situ test – plate loading test, dilatometer test Modulus of Deformation Property of rock mass Measured in situ test -plate loading test, dilatometer test An important parameter for design of geotechnical structure

    4. Background Modulus of deformation is often predicted by RMR Several relations between modulus of deformation and RMR are suggested

    5. Motivations and Objectives Modulus of deformations in other researches were measured by plate loading test. The numbers of data in other researches are small. Modulus of deformation measured by dilatometer may be 2 –3 times lower than those measured by plate loading test (Rocha, 1974). Correlation of in-situ modulus of deformation with degree of weathering. Correlation of in-situ modulus of deformation with RMR. Objectives of this researchObjectives of this research

    6. Data collection 2354 data of Modulus of Deformation were collected.

    7. Correlation of in-situ modulus of deformation with degree of weathering Highly weathered rock Moderately weathered rock

    8. Correlation of in-situ modulus of deformation with degree of weathering Slightly weathered rock Fresh rock

    9. Correlation of in-situ modulus of deformation with degree of weathering

    10. Correlation of In-situ modulus of deformation with degree of weathering

    11. Correlation of In-situ modulus of deformation with degree of weathering

    12. Relation between in situ modulus of deformation and RMR

    13. Relation between in situ modulus of deformation and RMR

    14. Comparison of suggested equations(1)

    15. Comparison of suggested equations(2)

    16. Relation between modulus of deformation and RMR for gneiss

    17. Relation between modulus of deformation and RMR for granite

    18. Relation between modulus of deformation and RMR for sandstone

    19. Relation between modulus of deformation and RMR for shale

    20. Relation between modulus of deformation and RMR for Limestone

    21. Relation between modulus of deformation and RMR for other rock type

    22. RMR values predicted by relations suggested by this research and others.

    23. Conclusions In-situ modulus of deformation of rock masses were correlated with the degree of weathering. Modulus of deformations show almost the same normal distributions in each degrees of weathering. The ranges of in situ modulus of deformation for each degree of weathering are as follows. completely weathered rocks : 0.07 - 0.43 GPa moderately weathered rocks : 0.43 - 1.38 GPa slightly weathered rocks : 1.38 - 3.72 GPa fresh rocks : 3.72 - 16.6 GPa LL

    24. Conclusions In situ modulus of deformation were correlated with RMR and new equation is suggested : EM = 10 (RMR-16) / 50 New equation suggested by this research gives more reasonable values than others. In situ modulus of deformation measured by the dilatometer test or Goodman jack test is 2.5 - 3 times lower than that measured by the plate loading test, which is agreeable with the results obtained by Rocha(1974). Although small differences of relations with respect to lithology were found, the equation suggested by this research could be used to predict in situ modulus of deformation from RMR values for all rock types.

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