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根据现场调查和资料分析,认为洪亮营隧道滑坡属铁路隧道施工引发的工程滑坡,滑坡总方量约1.82×10~5 m~3,滑坡类型为黄土错落性滑坡,结合其形态和微地貌特征,可将滑坡从平面上划分为滑壁变形区、牵引滑体、主滑体、右侧次滑体和左侧次滑体5个区域.洪亮营隧道斜坡属自然形成的黄土斜坡,研究认为人类工程对斜坡的开挖扰动和路基施工中强夯形成的循环荷载是滑坡的主要引发因素.对滑坡的形成机理和过程可概括为4个阶段:开挖应力调整阶段、蠕滑剪切和拉裂阶段、锁固剪断和错落阶段、侧向分离扩展阶段,滑坡形成了垂直运动距离大于水平运动距离的错落性滑动,破坏了隧洞并封闭了洞口.采用有限元法对滑坡的变形进行了模拟,结果很好地反映了滑坡体内的变形场、应力场及破坏区分布,这样有助于更加客观、全面地对滑坡稳定性进行评判.
According to the field survey and data analysis, it is considered that the landslide caused by the construction of the Hongliangying tunnel is caused by the construction of railway tunnels. The total landslide volume is about 1.82 × 10 ~ 5 m ~ 3. The landslide type is loess patchy landslide. Combined with the morphological and micro- , The landslide can be divided into 5 areas of sliding wall deformation zone, traction slip body, main sliding body, right sliding body and left sliding body from the plane.Hongliangying Tunnel slope belongs to the naturally formed loess slope, Human engineering disturbance to slope excavation and cyclic loading caused by dynamic compaction during subgrade construction are the main factors that cause the landslide.The formation mechanism and process of landslide can be summarized as four stages: adjustment stage of excavation stress, creep shear and In the stage of fracturing, locking and shearing, and lateral spreading and spreading, the landslide formed the slippage sliding with the vertical movement distance greater than the horizontal movement distance, which destroyed the tunnel and closed the hole. The deformation of the landslide was carried out by the finite element method Simulation results show well the deformation field, stress field and damage zone distribution in the landslide, which is helpful to evaluate the landslide stability more objectively and comprehensively.