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在水流的溶蚀、磨蚀和冲蚀作用下,陷落柱内部胶结结构发生破坏并伴有质量流失,当水流作用持续到一定时间,渗流将发生失稳。为了揭示陷落柱的突水机理,利用自主研制的渗透试样压制装置和破碎岩石渗透试验系统进行了胶结破碎泥岩渗透试验,分析了胶结物质、渗透压力、破碎泥岩粒径分布和初始孔隙度对胶结破碎泥岩渗透性的影响。研究表明:1)随着胶结强度的增大,渗流失稳历时变长;采用水泥做胶结剂时,试样中渗透流量趋于稳定,不发生失稳。2)失稳历时随渗透压力按指数函数减小。3)随着Talbol幂指数的增大,试样中大颗粒增多,阻隔水能力增强。4)随着初始孔隙度的增大,试样渗透性增强,渗流失稳历时随初始孔隙度按指数函数减小。
Under the action of water erosion, erosion and erosion, the cementing structure inside the collapse column breaks down and is accompanied by mass loss. When the water flow continues for a certain period of time, the seepage will destabilize. In order to reveal the water inrush mechanism of the collapse column, the cementation-fractured mudstone infiltration test was carried out by using the self-developed infiltrating sample compaction device and the broken rock infiltration test system. The effects of the cementation material, the osmotic pressure, the particle size distribution of broken mudstone and the initial porosity Effect of cementation on the permeability of mudstone. The results show that: 1) With the increase of cementation strength, seepage instability lasted longer; when using cement as cement, the permeate flux in the sample tends to be stable without instability. 2) The instability duration decreases with the osmotic pressure exponentially. 3) With the increase of Talbol’s power index, the larger particles in the sample increase the barrier water capacity. 4) As the initial porosity increases, the permeability of the sample increases and the seepage instability duration decreases exponentially with the initial porosity.