【作者】 李泽荃；

【导师】 张瑞新；

【作者基本信息】 中国矿业大学（北京） ， 采矿工程， 2014， 博士

【摘要】 节理岩体中结构面的几何参数和力学参数固有的随机特性影响了岩体工程的稳定性。本文从概率论角度以关键块体理论为基础，结合三维随机结构面网络模拟技术对此问题进行了深入地研究。论文首先以南澳大利亚州Adelaide地区的Kanmantoo铜矿作为工程研究背景，通过一系列现场地质调查和室内试验对结构面的各类几何和力学参数进行了统计分析。进而在确定其统计分布类型的基础上，采用结构面网络模拟程序进行随机模拟，通过块体搜索程序对巷道开挖后自由面上的随机块体进行自动搜索。随后基于生成的大量随机块体，进行了随机块体几何参数方面的统计分析，讨论了结构面的力学参数对块体稳定性的影响，建立了基于可靠度理论的块体失效概率评价模型，并在计算中同时考虑了结构面几何和力学参数的随机性。最后，采用统计方法通过块体算例分析计算验证了这一评价模型的正确性。研究结果表明，论文所提出的计算方法能够有效地预测出块体的失稳概率。更多还原

【Abstract】 Uncertainty and variability are inevitable in geotechnical engineering researches relating tonatural rock materials. The deterministic analysis method, based on fixed values of discontinuityparameters and the factor of safety concept, is not proper to handle these problems. Thus, theprobabilistic analysis method, as an alternative approach, has been introduced to the geotechnicalengineering area. The assessment of the proposed method will be applied to data from HillgroveResources’s Kanmantoo project in the Adelaide hills in Australia. Based on the analysed data ofgeometrical and mechanical parameters of fractures from the site, the rock mass will be modeled,and attempts will be made to identify wedge formations within this model with using a computerprogram. Once wedge forming structures have been identified, the properties and occurrence ofthese wedges will be analysed in the next stage. And then the impacts of mechanical parameters offracture on the stability of wedges will be discussed. Finally, an assessment model of wedgefailure probability based on the reliability theory will be established, and in the calculation therandom properties of the geometrical and mechanical parameters of discontinuity are taken intoaccount simultaneously. To evaluate the feasibility of the new method, the method was applied toanalyse some wedges. Results show that the probabilistic approach can be used effectively toassess the rock wedge stability with random properties of discontinuity parameters.更多还原