[논문]표준 거칠기 단면의 실험적 검증에 의한 새로운 거칠기 계수 및 전단강도 기준식

장현식; 심민용; 장보안

doi:10.9720/kseg.2021.4.561

[국내논문] 표준 거칠기 단면의 실험적 검증에 의한 새로운 거칠기 계수 및 전단강도 기준식
New Joint Roughness Coefficient and Shear Strength Criterion Based on Experimental Verification of Standard Roughness Profile 원문보기

지질공학 = The journal of engineering geology, v.31 no.4, 2021년, pp.561 - 577

장현식 (강원대학교 지구자원연구소) , 심민용 (강원대학교 지구물리학과) , 장보안 (강원대학교 지구물리학과)

초록
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Barton and Choubey(1977)가 제안한 10개의 표준 거칠기 단면을 3차원으로 확장하여 모든 단면의 거칠기가 일정한 3차원 표준 거칠기 절리 모형을 제작하였다. 석고를 사용하여 이 절리 모형을 복제하여 절리시료를 제작하였고, 복제된 절리시료에 직접전단시험을 실시하여 표준거칠기 단면에 부여된 절리 거칠기계수(JRC)를 검증하였다. 먼저 절리 시료의 JRC, 절리면압축강도(JCS)와 기본마찰각(𝜙_b)을 이용하여 Barton (1973)의 전단강도 기준식에서 절리의 전단강도를 추정하고, 직접전단시험에서 측정된 전단강도와 비교하였다. 직접전단시험에서 측정된 전단강도는 1번과 4번 표준 거칠기를 제외한 8개 시료에서 Barton의 기준식에서 추정된 전단강도보다 낮았고, JRC가 큰 시료에서 차이가 더욱 크게 나타났다. 직접전단시험 결과를 역해석하여 JRC, JCS 그리고 𝜙_b의 적절성을 검토하였고, JRC의 문제점으로 인하여 측정된 전단강도가 추정된 전단강도보다 낮은 것으로 판명되었다. 역해석으로 구한 표준 거칠기 단면의 JRC 값인 JRC_m은 JRC보다 전반적으로 낮은 값을 보이지만 JRC와 상관성이 매우 높은 직선의 관계를 나타내었다. 위의 결과를 종합하여 표준 거칠기 단면의 정확한 JRC_m을 제시하였고, JRC_m과 JRC의 상관관계를 제시하였으며, Barton의 전단강도 기준식을 수정하여 제안하였다.

Abstract ▼ AI-Helper

The ten standard roughness profiles suggested by Barton and Choubey (1977) were extended to make three-dimensional (3D) joint models whose profiles were identical at any cross section. Replicas of joint models were produced using plaster of Paris, and direct shear tests were performed to verify the joint roughness coefficients (JRC) of the standard roughness profiles. Joint shear strengths measured by direct shear tests were compared with those predicted by the shear failure criterion suggested by Barton (1973) based on JRC, joint compressive strength (JCS), and joint basic friction angle (𝜙b). Shear strengths measured from joints of the first and fourth standard roughness profiles were close to predicted values; however, shear strengths measured from the other joint models were lower than predicted, the differences increasing as the roughness of joints increased. Back calculated values for JRC, JCS, and from the results of the direct shear tests show measured shear strengths were lower than predicted shear strengths because of the JRC values. New JRC were back calculated from the measured shear strength and named JRCm. Values of JRCm were lower than the JRC for the standard roughness profiles but show a strong linear relationship to JRC. Corrected JRCm values for the standard roughness profiles are provided and revised relationships between JRCm and JRC, and new shear strength criterion are suggested.

주제어

표/그림 (16)

표 Table 1. Standard roughness profiles suggested by Barton and Choubey (1977). The numbers within parentheses are the exact JRC values
그림 Fig. 1. (a) Three-dimensional profile of a joint showing different roughness according to the scanning lines. (b) Joint roughness coefficients (JRC) measured along 30 different scanning lines (Jang et al., 2010).
그림 Fig. 2. (a) Three-dimensional joint model produced by digitized values of the eighth standard roughness profile. (b) Joint model produced by a 3D printer from the digitzed 3D Joint model.
표 Table 2. JRC values suggested by Barton and Choubey (1977) and Jang et al. (2014), and those measured from joint models produced by 3D printer
표 Table 3. Physical and mechanical properties of the plasters
표 Table 4. Basic friction angles determined by the tilt test and the pull test
그림 Fig. 3. Direct shear test apparatus.
그림 Fig. 4. Plot of shear stress versus shear displacement measured from replica joints of the fourth standard roughness profile using GM-10 plaster.
그림 Fig. 5. Shear stresses measured by direct shear tests for GM-10 (◆), Dental Stone (●), and Diestone (■). Solid lines represent Barton's failure criterion (Barton, 1973) for three types of plaster: GM-10 (green); Dental Stone (red); and Diestone (blue).
그림 Fig. 6. Joint compressive strengths (JCS) calculated from direct shear test results for: (a) GM-10; (b) Dental Stone; and (c) Diestone. Symbols: ranges of JCS (bars); JCS averages within the same standard roughness profile (■); JCS measured by the uniaxial compressive test (blue dotted lines); and JCS averages calculated from direct shear test results (red solid lines).
그림 Fig. 7. Basic friction angles (𝜙b) calculated from direct shear test results for: (a) GM-10; (b) Dental stone; and (c) Diestone. Symbols: ranges of (bars); averages of within the same standard roughness profile (■); measured by pull test (blues dotted lines); and averages of from direct shear test results (red solid lines).
그림 Fig. 8. Joint roughness coefficients (JRC) calculated from direct shear test results for: (a) GM-10; (b) Dental stone; and (c) Diestone. Symbols: JRC ranges (bars); averages of JRC within the same standard roughness profile (■); and JRC values suggested by Barton and Choubey (1977; ◆).
그림 Fig. 9. Relationship between JRC and JRC_m.
표 Table 5. JRC values back calculated from the direct shear tests of replica joint models
그림 Fig. 10. Relationships between the JRC_m of the standard roughness profiles and for sampling intervals of (a) 0.1 mm, (b) 0.5 mm, and (c) 1.0 mm.
그림 Fig. 11. Relationship between predicted peak shear strengths using JRC and JRC_m, and measured peak shear strengths.

AI 본문요약
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대상 데이터

직접전단시험은 (주)에이스원에서 제작한 직접전단시험기를 사용하여 수행되었고, 이 시험기의 수직응력은 ±1% 오차로 제어가 가능하고 전단방향으로는 일정한 전단변위 제어가 가능하다(Fig

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