The paper introduced the method of obtaining Hoek Brown model parameters and other physical parameters of rock mass by RocDate software according to the rock uniaxial compressive strength,the geological strength index,the rock material parameters,the excavation impact factor,based on the field investigation combining with laboratory tests.Then,the transition and cohesion between the indoor rock mechanics experimental parameters and the field actual rock mass parameters can be realized.By establishing the numerical analysis model,and with the use of geotechnical engineering software FLAC3D,the stability of the jointed rock slope after excavation in southwest section of Songshunan's mining area is analyzed according to the basic parameters of Hoek-Brown-constitutive model acquired.The results show that:①The slope in southwest section is in stable after excavation without large-scale collapse and slippage problem;②Shear stress concentration phenomenon appears on the steps at the bottom of the slope ;③small amounts of communicating plastic zone appears in the slope excavation steps,and instability exists in some local slopes.So these zones should be monitored and supported.%介绍了以野外现场调查为基础结合室内试验,借助RocDate软件根据岩石单轴抗压强度、地质强度指标,岩石材料参数和开挖影响因子,得出Hoek-Brown模型参数和岩体其他物理参数的方法,进而实现了室内岩石力学试验参数与野外现场实际岩体参数的过渡与衔接.建立数值分析模型,运用岩土工程软件FLAC3D,根据所获取的Hoek-Brown本构模型基本参数,对松树南沟矿区西南剖面节理岩质边坡进行开挖后稳定性分析.结果表明:①西南剖面边坡开挖后处于基本稳定状态,不存在大规模崩塌、滑移问题;②台阶边坡底部出现剪应力集中现象;③在边坡开挖台阶处出现了少量连通的塑性区域,局部边坡存在失稳可能,应对该区域加强监测与支护.
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