岩质隧洞边坡失稳机理研究

Study on Instability Mechanism of Rock Tunnel Slope

为了研究国内某铁矿隧洞边坡失稳机理,利用3dmine建立地质模型,将其导入到FLAC3D中进行三维数值模拟。在建立能反映地质地形条件的三维数值模型的基础上,采用摩尔—库伦模型,考虑剪切屈服和拉应力屈服,模拟出隧洞边坡的破坏,得到其塑性区分布图和位移分布图。根据塑性区分布特点和位移等值线图推测出隧洞边坡的破坏模式,进一步结合隧洞内各监测点监测的位移数据得出该岩质隧洞边坡的失稳机理。解释了隧洞发生破坏是因为边坡产生滑动,推动了坡体内的隧洞产生位移。不仅为下一步的加固治理提供了理论依据,同时也提供了从滑坡控制上实现隧洞加固的治理思路。

In order to confirm the instability mechanism of tunnel slope in a certain iron mine in China,the geological model was established by 3 dmine,and then imported into FLAC^（3D） to realize three-dimensional numerical simulation. Based on a three-dimensional numerical model that can reflect the geological topography situations,the Mohr-Coulomb model was adopted to simulate destruction of the tunnel slope with consideration of shear yield and tensile stress yield,and its plasticity and displacement distribution map were obtained. The failure mode of the rock tunnel slope was inferred according to the distribution characteristics of the plastic zone and the displacement contour map. Furthermore,the instability mechanism of the tunnel slope was achieved,combining with the displacement data of the monitoring points in the tunnel. It is explained that the tunnel destruction is caused by the slope sliding which drives the displacement of the tunnel in the slope. This research provides the theoretical basis for the further reinforcement management,and also provides the management idea of the tunnel reinforcement from landslide control.