基于大型直剪试验的粗粒料颗粒破碎对比研究

doi:10.13722/j.cnki.jrme.2014.0499

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摘要采用大型直剪仪对钦寸水库洞渣料与盂溪水库卵砾石料这两种粗粒料进行颗粒破碎试验，将裂离参量引入直剪试验结果的处理分析中，从粒组与粗粒料整体2个层面对比研究了2种土料的颗粒破碎发展规律。结果表明：对于2种粗粒料，在所研究的法向应力变化范围内，不同粒组颗粒的裂离比随法向应力的变化均呈现出线性化的递变规律，且2种粗粒料颗粒破碎水平的差异主要体现于较大粒径的粒组颗粒中。随着粒组粒径的减小，2种粗粒料的颗粒破碎水平趋于接近。对于粗粒料整体，当法向应力为0～300 kPa时，2种粗粒料的颗粒破碎水平较接近，当法向应力为300～1 200 kPa时，钦寸水库洞渣料的颗粒破碎水平比盂溪水库卵砾石料显著，且2种粗粒料的颗粒破碎水平均有随法向应力增大而继续提高的明显趋势。

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关键词 ：土力学, 粗粒料, 大型直剪仪, 颗粒破碎, 裂离参量

Abstract：Crushing of the slag from Qincun Reservoir and the gravel-cobble from Yuxi Reservoir was studied by large-scale direct shear tests，and discarding parameters were introduced to investigate laws of breakage development from stratification planes of fractions and granular soil as a whole respectively. The results show that the relationship between discarding ratio Rk and nominal stress ? is linear for different fractions of the tested coarse-grained soils with ? varying in the research range. And difference of crushing of the two tested soils，which is mainly reflected in the grains from larger fractions，tends to disappear as grain size decreases. For coarse-grained soil as a whole，when ? varies in the range of 0–300 kPa，the breakage degrees of two soils are rather close. However，once ? varies in the range of 300–1 200 kPa，crushing of slags from Qincun Reservoir is more significant than gravel-cobble from Yuxi Reservoir. Besides，breakages of the two coarse-grained soils tend to be more remarkable as increases.

Key words： soil mechanics coarse-grained soilslarge-scale direct shear tests crushing discarding parameters

引用本文:

李雪梅1，2，李红文1，3，方华建1，2. 基于大型直剪试验的粗粒料颗粒破碎对比研究[J]. 岩石力学与工程学报, 2015, 34(s1): 3581-3587.
LI Xuemei1，2，LI Hongwen1，3，FANG Huajian1，2. COMPARATIVE STUDY OF CRUSHING OF COARSE-GRAINED SOILS BY LARGE-SCALE DIRECT SHEAR TESTS. , 2015, 34(s1): 3581-3587.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2014.0499 或 http://www.rockmech.org/CN/Y2015/V34/Is1/3581

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