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首页> 美国政府科技报告 >Experimental Assessment of the Sealing Effectiveness of Rock Fracture Grouting.
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Experimental Assessment of the Sealing Effectiveness of Rock Fracture Grouting.

机译：岩石压裂灌浆封堵效果的试验评价。

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The objective of the investigation is to determine the effectiveness of cement grouts as sealants of fractures in rock. Laboratory experiments have been conducted on seven 15-cm granite cubes containing saw cuts, three 23-cm diameter andesite cores containing induced tension cracks, and one 15-cm diameter marble core containing a natural fracture. Prior to grouting, the hydraulic conductivity of the fractures is determined under a range of normal stresses. Grout is injected through an axial borehole. The fracture permeability is measured after grouting. Flow tests on the ungrouted samples confirm the inverse relation between normal stress and fracture permeability. The equivalent aperture determined by these tests is a reliable indicator of groutability. Experimental results confirm claims in the literature that ordinary portland cement inadequately penetrates fine fractures.

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