• Title/Summary/Keyword: 암반 특성

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An Evaluation of Empirical Prediction Equation for Deformation Modulus of Rock Masses by Field Measurements (암반변형계수의 현장시험을 통한 경험적 추정식의 적정성 평가)

  • Chun Byung-Sik;Lee Yong-Jae;Ahn Kyung-Chul;Shin Jae-Keun;Jung Sang-Hoon
    • Tunnel and Underground Space
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    • v.16 no.3 s.62
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    • pp.251-258
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    • 2006

  • In this paper, the applicability to the Korean rock condition of using the deformation moduli based on Rock Mass Rating (RMR) and Pressuremeter Test (PMT) is evaluated. The correlations among deformation moduli and various rock properties were also analyzed. It appears that the existing correlations using RMR overestimate the deformation moduli and wide variation was found between predicted moduli using these correlations and measured values. As for the correlations among the deformation moduli and various rock properties, Rock Quality Designation (RQD) and unconfined compressive strength (UCS) were found to correlate to deformation moduli reasonably well, but joint spacing and joint conditions appear to correlate poorly to RQD and UCS. Additionally, groundwater can not be correlated with the modulus values. While the depth has very little contribution to deformation modulus, it should be factored in the simple regression analyses with various rock mass properties, especially with the correlations made with UCS, RQD etc. With the deficiencies of these correlations, more in depth analysis techniques such as multivariate correlations may be to reliably estimate deformation modulus of rock mass.

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