基于聲發(fā)射定位的三軸受壓帷幕體試樣裂隙演化分析
[Abstract]:The TAW-3000 electro-hydraulic servo rock triaxial testing machine and the PCI-II acoustic emission monitoring system were used to test the acoustic emission (AE) of the curtain block made from the east side pebble of Yanshan Iron Mine under different confining pressure triaxial compression conditions. Combined with acoustic emission spatial location, AE event energy rate is used to analyze the evolution law of the crack space of curtain body at different stress stages, and the variation law of fractal dimension is studied. The test results show that the higher the confining pressure, the higher the compressive strength of the curtain, the more time it takes to reach the peak load, the longer the rising section of the corresponding time-stress curve is, and the smaller the curvature is, the more obvious the plastic characteristics of the curtain body are. Cumulative AE positioning points more. The basic characteristics of fractal dimension change are ascending dimension, reducing dimension and reraising dimension pattern. AE event energy rate and location number increase suddenly, and the sign of secondary dimension elevation destroys precursor. Under the same stress state, the bonding surface of pebble and mortar in the curtain begins to crack first, then the joint surface of sand and cement slurry cracks, and finally the crack enters into the hardened cement slurry.
【作者單位】: 華北理工大學(xué)礦業(yè)工程學(xué)院;河北省礦業(yè)開發(fā)與安全工程實(shí)驗(yàn)室;
【基金】:河北省自然科學(xué)基金項(xiàng)目(編號(hào):E2015209260) 唐山市科技計(jì)劃項(xiàng)目(編號(hào):13130239z)
【分類號(hào)】:TD31
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