固结煤矸石抗剪强度特征试验

Experimental research on the shear strength of consolidation gangue

依据现场大型剪切试验和室内直剪试验,研究了固结煤矸石的抗剪强度特性。试验剪应力-剪位移过程曲线表明,一定含水率条件下的固结煤矸石呈现明显的粘塑性体力学特性。以现场大型剪切试验煤矸石作为试样配料进行了室内直剪试验,分析了含水率和密实度对良好固结煤矸石试样剪应力-剪位移试验曲线以及抗剪强度参数的影响,在此基础上探讨了试样内煤及其它细颗粒的状态变化对固结煤矸石抗剪强度的弱化作用机理,最后对比分析了现场大型剪切试验抗剪强度参数值和室内直剪试验抗剪强度参数值的差异及其产生的主要原因。

According to in-situ direct shear test and indoor direct shear test,the shear strength features of solidification gangues are researched.The experimental curve of shearing strength-shearing displacement shows that with the increase of the moisture content of the sample,the solidification gangue sample has shown obvious characteristics of viscoplastic body.Based on the on-site sieve grading of gangue samples,the moisture content and compactness of samples are adjusted to determine the influence of the changes on the shear strength of solidification gangue,and meanwhile the influence mechanism of the fine particle states changes on the shearing strength of solidification gangues is under research.The last,by the comparison of the shear strength test parameters of in-situ direct shear test and indoor direct shear test of gangue samples,the main causes of differences in shear strength parameters of consolidation gangue samples is analyzed.