Experimental Study of Shear Strength Features of Regenerated Rock Mass compacted and consolidated by Broken Soft Rocks
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Rock mass composed of Broken Soft Rocks (BSR) under confined compression is widely distributed in geotechnical and underground engineering. To reveal the influence law of rock grain gradation and compression ratio on the shear strength properties of Regenerated Rock Mass Structure (RRMS) formed by confined compression of BSR, first, a series of compression tests of BSR with different grain gradation and compression ratios were carried out with homemade compression cylinders, through which the compression behavior of BSR was gained. In addition, the achieved Cylindrical RRMS (CRRMS) after compression was used for shear tests. Second, shear strength parameters of the CRRMS were obtained through shear tests under changing shear angle. It turns out that the CRRMS of smaller grain gradation has a better compaction degree and smoother surface. Nevertheless, the CRRMS of larger grain gradation, in contrast, has obvious gaps and a rough surface. During the compression process, the BSR of smaller grain gradation requires larger axial compression force, and the BSR of mixed grain gradations, which contain smaller grain gradation, has a better compaction effect than others. The internal friction angle of CRRMS increases with the growth in rock grain gradation, and the incremental rate of mixed grain gradations is less than those of the others. The change trend of cohesion is contrary to the internal friction angle, which decreases with the increase in grain gradation. With the homogeneous increase in the compression ratio, the internal friction angle decreases gradually, while the cohesion is contrary to the internal friction angle.
Keywordsbroken soft rocks compression behavior regenerated rock mass structure shear strength grain gradation compression ratio
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