深部岩体岩芯饼化特征分析与原岩应力计算研究

发布时间：2018-07-18 12:51

【摘要】：以三山岛金矿地质勘探钻孔岩芯饼化现象为背景,详述饼化破坏特征,结合国内外多种推算地应力的理论计算公式,与现场岩芯饼化厚度进行大量对比计算,并基于矿区多个水平的地应力测量和岩石试验结果,得出了岩芯饼化薄饼与厚饼推算地应力的优势公式。通过3DEC数值模拟软件结合前期地应力测量成果模拟了钻孔过程以及岩芯根桩的应力分布,依据应力分区和优势公式推算了岩芯根桩不同应力分区的岩芯饼化厚度。区域Ⅰ,最大主应力为82~83.6 MPa,饼化厚度为7.7~7.9 mm;区域Ⅱ,最大主应力为80~82 MPa,饼化厚度为7.9~8.36 mm;区域Ⅲ,最大主应力为76~78 MPa,饼化厚度为8.79~9.31 mm。通过数值模拟兼理论计算获得的岩芯饼化厚度与现场实测误差在2 mm以内,为岩芯饼化现象研究提供了有益思路。
[Abstract]:Taking the phenomenon of core cake in the borehole of geological exploration of Sanshandao gold mine as the background, this paper details the characteristics of the destruction of the rock core in detail, and combines with various theoretical calculation formulas to calculate the in-situ stress, and carries out a great deal of comparison and calculation with the thickness of the core-cake in the field. Based on the in-situ stress measurement and rock test results at several levels in the mining area, the predominance formulas for calculating the in-situ stress of core-cake pancake and thick cake are obtained. The borehole process and the stress distribution of the core root pile were simulated by using 3DEC numerical simulation software combined with the results of in-situ stress measurement. The core-cake thickness of different stress zones of the core root pile was calculated according to the stress zoning and the dominant formula. In region 鈪，

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