构造煤受载破坏过程电阻率响应的方向性差异特征
Directional difference characteristics of resistivity response of tectonic coal in process of load-bearing failure
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摘要: 开展了配比软煤正方体试样的单轴压缩试验,分析了构造煤受载破坏过程的应力应变特征,得到不同方向上煤体的电阻率响应特征。结果表明:试样从加载到破坏分为4个阶段,依次为压密阶段、弹性阶段、塑性阶段和破坏阶段;煤体受载过程中,煤体呈现劈裂破坏形态,裂纹从试样底部向上方扩展,部分裂纹贯穿试样的上下表面;试样在竖直方向和水平方向上的电阻率响应特征呈现明显的差异性,竖直方向上试块的电阻率呈现先减小后增大的趋势,而水平方向上试块的电阻率呈现缓慢增大、快速增大和急剧增大3个阶段;试块发生破坏后,竖直方向的电阻率变化远不如水平方向电阻率的变化幅度大,而且水平方向电阻率呈现持续增大的特征。Abstract: The uniaxial compression experiments of soft coal samples were carried out, and we analyze the stress-strain characteristics of the tectonic coal in the process of load-bearing failure, and obtain the resistivity response characteristics of the coal in different directions. The experimental results show that the specimen can be divided into four stages from loading to failure, which are compaction stage, elastic stage, plastic stage and failure stage; during the loading process of the coal, the coal is in the form of splitting failure, the cracks spread from the bottom to the top of the sample, and part of the cracks run through the upper and lower surfaces of the sample; the resistivity response characteristics of the specimen in the vertical and horizontal directions in the uniaxial compression process show obvious differences, the resistivity of the coal in the vertical direction decreases first and then increases in the process of teactonic coal loading, and the resistivity of the test block increases slowly, rapidly and sharply in the horizontal direction; after the failure of the test block, the change range of the resistivity in the vertical direction is far less than that in the horizontal direction, and the resistivity in the horizontal direction is characterized by continuous increase.
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Keywords:
- tectonic coal /
- loading failure /
- resistivity /
- directionality /
- uniaxial compression experiment
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