Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
New Empirical Criterion for Evaluating Peak Shear Strength of Unmatched Discontinuity with Different Joint Wall Compressive Strengths
Abstract Discontinuities with different joint wall compressive strengths (DDJCS) are common in the Three Gorges Reservoir Area, China. Accurate estimation of the peak shear strength of DDJCS is essential for evaluating the stability of rock slope in the area. However, the coupling effects of strength difference in rock types and matching degree in rock blocks on the peak shear strength of such a discontinuity have not been well investigated. In this study, DDJCS with different matching degrees are used to conduct direct shear tests, modelled by applying horizontal dislocations between the two rock blocks along shearing direction. Experimental results illustrate that the joint peak shear strengths decrease linearly as the horizontal dislocation increases, while the ratio of peak shear strength for the unmatched DDJCS to the matched DDJCS is almost unaffected by the joint wall strength difference when the imposed lateral dislocation is equal. An empirical criterion is proposed by multivariate regression analysis to account for the above-mentioned coupling effects, which can be degraded into available criterion as the horizontal dislocation is zero. Several natural discontinuities with different joint wall compressive strengths are then collected from the Three Gorges Reservoir Area to verify the proposed criterion. Due to the low overall estimation error (about 6.20% for the unmatched rock-like discontinuities, and 12.4% for the unmatched natural discontinuities), the proposed criterion can be used to evaluate the peak shear strengths of unmatched DDJCS to some extent.
Highlights Peak shear strength of discontinuity with different joint wall compressive strengths linearly decreases as initial horizontal dislocation between the two rock blocks increases.New failure criterion is developed to evaluate the peak shear strength of unmatched discontinuity with different joint wall compressive strengths.Three factors are mainly considered by the proposed criterion: matching condition, joint wall strength difference, and three-dimensional roughness metric.
New Empirical Criterion for Evaluating Peak Shear Strength of Unmatched Discontinuity with Different Joint Wall Compressive Strengths
Abstract Discontinuities with different joint wall compressive strengths (DDJCS) are common in the Three Gorges Reservoir Area, China. Accurate estimation of the peak shear strength of DDJCS is essential for evaluating the stability of rock slope in the area. However, the coupling effects of strength difference in rock types and matching degree in rock blocks on the peak shear strength of such a discontinuity have not been well investigated. In this study, DDJCS with different matching degrees are used to conduct direct shear tests, modelled by applying horizontal dislocations between the two rock blocks along shearing direction. Experimental results illustrate that the joint peak shear strengths decrease linearly as the horizontal dislocation increases, while the ratio of peak shear strength for the unmatched DDJCS to the matched DDJCS is almost unaffected by the joint wall strength difference when the imposed lateral dislocation is equal. An empirical criterion is proposed by multivariate regression analysis to account for the above-mentioned coupling effects, which can be degraded into available criterion as the horizontal dislocation is zero. Several natural discontinuities with different joint wall compressive strengths are then collected from the Three Gorges Reservoir Area to verify the proposed criterion. Due to the low overall estimation error (about 6.20% for the unmatched rock-like discontinuities, and 12.4% for the unmatched natural discontinuities), the proposed criterion can be used to evaluate the peak shear strengths of unmatched DDJCS to some extent.
Highlights Peak shear strength of discontinuity with different joint wall compressive strengths linearly decreases as initial horizontal dislocation between the two rock blocks increases.New failure criterion is developed to evaluate the peak shear strength of unmatched discontinuity with different joint wall compressive strengths.Three factors are mainly considered by the proposed criterion: matching condition, joint wall strength difference, and three-dimensional roughness metric.
New Empirical Criterion for Evaluating Peak Shear Strength of Unmatched Discontinuity with Different Joint Wall Compressive Strengths
Tang, Zhi Cheng (Autor:in) / Yan, Cheng Zeng (Autor:in)
2022
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
BKL:
38.58
Geomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
38.58$jGeomechanik
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
ELIB41
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