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The sliding criterion (discontinuity) is a tool to estimate easily the shear strength properties of a discontinuity in a rock mass based on visual and tactile (i.e. by feeling) characterization of the discontinuity.〔〔〔〔 The shear strength of a discontinuity is important in, for example, tunnel, foundation, or slope engineering, but also stability of natural slopes is often governed by the shear strength along discontinuities. The ''sliding-angle'' is based on the ease with which a block of rock material can move over a discontinuity and hence is comparable to the ''tilt-angle'' as determined with the ''tilt test'', but on a larger scale. The ''sliding criterion'' has been developed for stresses that would occur in slopes between , hence, in the order of maximum . The ''sliding criterion'' is based on back analyses of slope instability and earlier work of ISRM〔 and Laubscher.〔 The ''sliding criterion'' is part of the Slope Stability Probability Classification (SSPC)〔 system for slope stability analyses. ==Sliding-angle== The sliding-angle is calculated as follows: ::where ''sliding-angle'' is in degrees, and ::''Rl'' = roughness large scale ::''Rs'' = roughness small scale ::''Im'' = infill material in the discontinuity ::''Ka'' = karst; presence of karst (solution) features along the discontinuity (The values for the parameters are listed in table 1 and explained below) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Sliding criterion (geotechnical engineering)」の詳細全文を読む スポンサード リンク
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