煤矸石抗剪强度特性试验对比研究

doi:10.13722/j.cnki.jrme.2014.0303

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摘要为了分析不同时期排弃的煤矸石力学特性的差异性，以现场固结煤矸石样本筛分级配为试验级配进行不同试样含水率条件下固结煤矸石与新排弃煤矸石的室内对比直剪试验。试验结果表明，与新排弃煤矸石试验曲线均呈应力硬化现象不同，固结煤矸石在试样含水率较小时试验剪应力–剪位移曲线存在相对突出的峰值，呈明显应变软化现象。而随着试样含水率增大，固结煤矸石的黏结性特性得到呈现，应力–应变关系也渐变为应变硬化。试样干密度与试样含水率对固结煤矸石和新排弃煤矸石抗剪强度参数的影响不同，干密度对固结煤矸石黏聚力以及新排弃煤矸石内摩擦角的影响更为显著。而相对于新排弃煤矸石，固结煤矸石内摩擦角对试样含水率更为敏感，至饱和含水率时固结煤矸石抗剪强度主要由黏聚力提供，而新排矸石内摩擦角值降低的幅度则不到15%。试样含水率对固结煤矸石及新排弃煤矸石抗剪强度影响的差异与矸石组成中细颗粒组成成分相关。试验成果可为煤矸石山的稳定性计算提供依据。

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关键词 ：岩石力学, 固结煤矸石, 新排弃煤矸石, 室内直剪试验, 含水率, 抗剪强度

Abstract：In order to analysis the mechanical characteristic differences of coal gangue abandoned in different periods，based on the on-site gradation，the direct shear tests of consolidation coal gangue and fresh coal gangue with different moisture content are carried out. The test results indicate that different from the fresh gangue，the consolidation gangue has shown obvious bonding characteristic with the increase of moisture content. The stress-strain relationship also is gradually change into the strain hardening of high moisture content from the strain softening of low moisture content. The influence of dry density and moisture content of gangue specimen to the shear strength parameters is different to the consolidation coal gangue and to fresh coal gangue. The dry density has more significant effect to the consolidation gangue?s cohesive strength and the fresh gangue?s internal frictional angle. Compare with fresh coal gangue，the consolidation coal gangue is more sensitive to the moisture content of specimen. When the moisture content is close to saturation state，the internal friction angle of consolidation coal gangue is nearly zero and the shear strength is mainly provided by the internal cohesive force at this time. Meanwhile the reducing range of fresh coal gangue is less than 15%. The difference of shear strength characteristics is related to the fine particle composition in coal gangue. The test results in this paper can offer a basis for the stabilization calculation of coal gangue hill.

Key words： rock mechanics consolidation gangue fresh gangue direct shear test moisture content shear strength

引用本文:

李东升1，2，3，刘东升3. 煤矸石抗剪强度特性试验对比研究[J]. 岩石力学与工程学报, 2015, 34(s1): 2808-2816.
LI Dongsheng1，2，3，LIU Dongsheng3. COMPARATIVE TEST RESEARCH ON THE SHEAR STRENGTH CHARACTERISTIC OF GANGUE. , 2015, 34(s1): 2808-2816.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2014.0303 或 http://www.rockmech.org/CN/Y2015/V34/Is1/2808

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