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Tilt test (geotechnical engineering)
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Tilt test (geotechnical engineering) : ウィキペディア英語版
Tilt test (geotechnical engineering)

In geomechanics, a tilt test is a simple test to estimate the shear strength parameters of a discontinuity.〔〔 Two pieces of rock containing a discontinuity are held in hand or mounted in test equipment with the discontinuity horizontal. The sample is slowly tilted until the top block moves. The angle with the horizontal at onset of movement is called the ''tilt-angle''.
The size of the specimen is limited to 10–20 cm for hand-held tests, while machine-operated tilt test equipment may handle up to meter-sized samples. In the field, the angle can be determined most easily with an inclinometer as present in most geological or structural compasses.
==Tilt-angle==
The ''tilt-angle'' equals the material friction of the discontinuity wall plus the roughness i-angle (''tilt-angle'' = ''φwall material'' + ''i'') if no real cohesion is present (i.e. no cementing or gluing material between the two blocks), no infill material is present, the asperities do not break, and the walls of the discontinuity are completely fitting at the start of the test, while if the walls of the discontinuity are completely non-fitting, the ''tilt-angle'' equals the friction of the material of the discontinuity walls (''tilt-angle'' = ''φwall material''). If cementation or gluing material is present or asperities break, the ''tilt-angle'' represents a combination of the (apparent or real) cohesion and the friction along the discontinuity. If infill material is present, the ''tilt-angle'' is governed partially or completely by the infill, depending on the thickness of the infill and height of asperities.〔

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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