Aiming at rock brittle-ductile transition and frequent underground pressure activity in deep Fankou mine, geostress measurement was carried out by using developed LUT over-coring system in deep level. Considering complex geological modeling, inversion load expression and nonlinear mapping between load factors and measured stress, the nonlinear loading words and load parameters searching program were compiled, and thus a new nonlinear inversion method of geostress field characterized by chaotic search theory was put forward. The new inversion method was applied in the Fankou mine. The results show that the inversed stress fits well with measured stress, and the average fitting accuracy exceeds 90%. The nonlinear chaotic method is reasonable and workable for geostress field inversion, which can lay an effective foundation for safe production in deep mining level.%针对凡口矿深部开采面临的岩体脆-延性过渡、地压活动频繁等现状,采用改进型LUT套孔应力测定系统开展矿山深部原岩应力实测工作.对514组国内地应力实测值进行拟合分析,综合考虑复杂地质体建模、反演载荷表达、载荷系数与应力实测值之间的非线性映射,编写非线性加载命令及载荷系数搜索程序,提出以混沌搜索理论为核心的地应力场非线性反演新方法.将该方法应用于凡口矿深部初始地应力场反演.研究结果表明:应力反演值与实测值平均拟合精度达90%;将非线性混沌方法用于地应力场反演是可行的,能为深部安全开采提供有效支撑.
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