Non-linear analysis for calculating the support of a rock block with dilatant joint faces |
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| Institution: | 1. Politecnico di Torino. Dipartimento di Ingegneria Strutturale, Edile e Geotecnica;2. Università degli Studi di Brescia. Department of Civil, Environmental, Architectural Engineering and Mathematics. Via Branze 43, 25123 Brescia, Italy;3. Università degli Studi di Enna “Kore”. Facoltà di Ingegneria e Architettura;4. Università degli Studi di Palermo. Dipartimento di Ingegneria |
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| Abstract: | In jointed rock masses the instability of individuals, discrete blocks is a concern. In underground excavations it is necessary to know how much support is required for “key blocks” in the roof. As these blocks fall, dilatancy of the block's bounding joints tends to keep the block in contact with the surrounding rock mass. Shear stresses devloped along the joints as a result of this contact and help to support the block. By knowing the initial stress field and the shear properties of the joint, as a function of stress and displacement, a non-linear analysis can determine the normal and shear stresses on the bounding joints as a function of the displacement path. The amont of support required to keep the block in the roof can then be determined as a function of displacement. |
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