Experimental study on slaking characteristics of feeble disintegration soft rock in drying-wetting cycle

doi:10.16265/j.cnki.issn1003-3033.2017.08.016

Abstract

Abstract: In order to fill the gap of slaking characteristics research of feeble disintegration soft rock in the slaking characteristics of rock, so as to provide more comprehensive theoretical basis for solving related engineering problems, drying-wetting cycles tests of slaking were carried out on four kinds of rock regarding four kinds of soft rock including coarse sandstone, mudstone etc in Fuxin Haizhou open pit mine. According to the electron microscope photograph, mineral composition and physical parameters of the samples, the change law of the morphology, static disintegration index and the disintegration ratio of the four kinds of soft rock under slaking were researched. The results are drawn as follows. The slaking durability of feeble disintegration soft rock is closely related to their mineral composition, structure characteristics and physical property. The disintegration index is not accurate enough to be used to judge the slaking characteristics of feeble disintegration soft rock. It is more accurate to judge slaking characteristics by disintegration ratio. Adsorption of water by the face of internal crack causes the microfissure to generate the wedge pressure. Interaction between hydrophilic clay minerals and water generates the swelling stress. The slaking of feeble disintegration soft rock is caused by both the wedge pressure and the swelling stress.

Key words: soft rock, feeble disintegration, drying-wetting cycle, mineral composition, physical index, disintegration index, disintegration ratio

CLC Number:

X936

LIANG Bing, CAO Qiang, WANG Junguang, JIANG Liguo. Experimental study on slaking characteristics of feeble disintegration soft rock in drying-wetting cycle[J]. China Safety Science Journal, 2017, 27(8): 91-96.

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