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建立了多参量监测系统,包括声发射、介电常数、应变场和表面温度场等监测手段,来研究在单轴压缩条件下,变形局部化演化过程中煤样失稳破坏的多参量前兆特征.研究发现:在煤样劈裂破坏过程中,变形局部化带的演化经历了3个阶段:在第Ⅰ阶段中,变形局部化相对滑动分量占据主导;第Ⅱ阶段中,相对拉伸分量快速增加;第Ⅲ阶段中,相对拉伸分量和相对滑动分量均急剧增大.样品表面温度场前兆特征发生在第Ⅱ阶段,介电常数前兆特征发生在第Ⅲ阶段,声发射前兆特征发生在第Ⅰ和第Ⅱ阶段.
A multi-parameter monitoring system was established, including acoustic emission, dielectric constant, strain field and surface temperature field, to study the multi-parameter precursor features of coal sample destabilization under uniaxial compression The research shows that during the splitting and destruction of coal samples, the evolution of the deformation zone undergoes three stages: in the first stage, the relative sliding component of deformation localization dominates; in the second stage, the relative tensile component is fast Increase in the third stage, the relative tensile component and the relative sliding component are sharply increased.The precursor of the surface temperature field of the sample occurs in the second stage, the precursor characteristic of the dielectric constant occurs in the third stage, and the precursor of acoustic emission occurs in the Ⅰ and Ⅱ stage.