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作者应用光弹、电测和电算方法,对地质钻探过程中岩芯地应力的释放进行了研究,找出了地应力释放后,岩芯中剩余应力的波及范围和分布规律。在此基础上,应用能量原理,推导出了一维和二维地应力的计算公式。同时,还用试验方法建立了一个一维地应力的计算公式。应用这些公式,根据岩芯饼化的特征参数;岩饼直径D、厚度t和长短轴差△D,可以计算出地应力的大小,从而大大简化了现有的地应力的测量工作。本文对几种地应力计算公式进行了分析比较,并用二维计算公式,对二滩电站实测岩饼资料进行了计算,得出二滩电站岩芯饼化地层的地应力为700kg/cm~2左右,中国科学院武汉岩体土力学研究所实测结果为650kg/cm~2,二者接近。
The author applied photoelastic, electrical measurements and computerized methods to study the release of core stress in the geological drilling process, and found out the range and distribution law of residual stress in the core after the release of the in-situ stress. Based on this, applying the energy principle, the calculation formulas for the one-dimensional and two-dimensional ground stresses are deduced. At the same time, a calculation formula for one-dimensional ground stress was also established using experimental methods. Using these formulae, according to the characteristic parameters of the core cake, the rock cake diameter D, the thickness t and the length and the short axis difference ΔD, the magnitude of the ground stress can be calculated, which greatly simplifies the existing ground stress measurement work. In this paper, several calculation formulas for ground stress are analyzed and compared, and two-dimensional calculation formulas are used to calculate the measured rock cake data at Ertan Hydropower Station. It is concluded that the ground stress of the cored cake formation in Ertan Power Station is 700 kg/cm~2. About the Institute of Soil Mechanics, Institute of Soil Mechanics, Chinese Academy of Sciences, the actual measurement result is 650 kg/cm2, which are close to each other.