基质和块石强度对bimrocks类岩石力学特性影响

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中图分类号：TU452 文献标识码：A

Abstract： To study the influence of the strength of the matrix and the block stones on the mechanical properties of bimrocks， block stones and matrix were prepared with different ratios of cement and quartz sand. Two matrix ratios and four stone contents were used to make specimens for indoor uniaxial tests and direct shear tests. The test results show that under uniaxial compression conditions， when the stone content is 50% ， the specimens with matrix ratios of 1：3 and 3：1 have reached the maximum values of uniaxial compressive strength and elastic modulus， and the failure types of the specimens are all shear failure. Under direct shear conditions， the low-strength group （ cement ∵ sand ratio of 1：3 ） shows a trend of decreasing shear strength with the increase of stone content under all normal forces. The highstrength group （ cement ∶ sand ratio of 3：1 ） also basically conforms to this trend. Both matrix ratio specimens show a trend of increasing cohesion first and then decreasing with the increase of stone content， and the internal friction angle shows an overall decreasing trend. Under the same stone content， the cohesion of the high-strength group is respectively increased by 222.86% ， 200.36% ， 784.86% ， and 383.14% compared with the low-strength group; the internal friction angle is reduced by 25.29% ， 22.35% ， 26.43% ， and 24.26% ， respectively.

Key words： bimrocks; mechanical properties; uniaxial test; direct shear test; failure characteristic

bimrocks（ block-in-matrix rocks） 一般是指高强度块石镶嵌在低强度细粒基质中的复杂岩土体材料[1]，而在风化等自然条件下，也会出现块石强度小于基质强度的情况。（剩余10741字）