【摘要】：以三山島金礦地質(zhì)勘探鉆孔巖芯餅化現(xiàn)象為背景,詳述餅化破壞特征,結(jié)合國內(nèi)外多種推算地應(yīng)力的理論計算公式,與現(xiàn)場巖芯餅化厚度進行大量對比計算,并基于礦區(qū)多個水平的地應(yīng)力測量和巖石試驗結(jié)果,得出了巖芯餅化薄餅與厚餅推算地應(yīng)力的優(yōu)勢公式。通過3DEC數(shù)值模擬軟件結(jié)合前期地應(yīng)力測量成果模擬了鉆孔過程以及巖芯根樁的應(yīng)力分布,依據(jù)應(yīng)力分區(qū)和優(yōu)勢公式推算了巖芯根樁不同應(yīng)力分區(qū)的巖芯餅化厚度。區(qū)域Ⅰ,最大主應(yīng)力為82~83.6 MPa,餅化厚度為7.7~7.9 mm;區(qū)域Ⅱ,最大主應(yīng)力為80~82 MPa,餅化厚度為7.9~8.36 mm;區(qū)域Ⅲ,最大主應(yīng)力為76~78 MPa,餅化厚度為8.79~9.31 mm。通過數(shù)值模擬兼理論計算獲得的巖芯餅化厚度與現(xiàn)場實測誤差在2 mm以內(nèi),為巖芯餅化現(xiàn)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，

本文編號：2131956