Abstract
One of the key factors affecting the stability of coal pillar dam at the boundary of underground reservoir is pH value of mining water resources. So, the comprehensive characterization of micro-pore structure and fracture evolution characteristics of coal pillar dam samples with different pH values were studied and measued in the thesis. Combined with XRD results, the clay minerals are mainly kaolinite. Based on three-dimensional CT reconstruction, the development degree of coal pore fractures were: strong acid > strong alkali > neutral mine water > natural drying, the longer the roar tends to develop in lower section with high H+ concentration. Based on AE Fourier transform, the higher the H+ concentration, the higher the development degree of macro-large fractures; the higher the OH– concentration, the higher the development degree of small-sized fractures. However, the higher the H+ concentration, the higher the macro-orderliness of the crack system.
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