冻融作用下德尔尼铜矿边坡滑坡的演化机制

以德尔尼铜矿北帮边坡滑坡为研究对象,选取岩性、抗压强度、含水率、风化程度、冻结温度以及冻融次数为冻融作用影响因素,以不同冻融时间周期海量点荷载试验数据为真实值,应用混沌神经网络对冻融作用下岩体的物理力学性质进行分析研究,并通过反演分析、稳定性计算进行验证;以冻融作用对岩体强度的劣化及水冰相变引起的岩体裂隙扩展为切入点,结合滑坡体空间形态信息、爆破卸荷作用、上覆岩层压力导致的非均匀变形,分析冻融作用下滑坡的演化机制。结果表明:冻融作用下滑坡的演化机制主要在于岩体强度的劣化、水冰相变过程对岩体裂隙扩张的影响以及爆破卸荷的加剧作用。

Study on Slope Landslide Evolution Mechanisms of the Deerni Copper Mine under the Freeze-thaw Action

With the landslide in the northern slope of Deerni copper mine as the research object,selecting lithology,com-pressive strength,water content,weathering degree,freezing temperature and the times of freeze-thaw action as effect factor,tak-ing different periods of massive point load test information as true value,the physical and mechanical properties of the rock are investigated with the application of chaotic neural network under the freeze-thaw action,and validated by inverse analysis and stability calculation.As the breakthrough point by deterioration of rock mass strength under the freeze-thaw action and the crack extension process in rock masses by transformation from water to ice,and combined with spatial information of the landslide, blasting and unloading effect,inhomogeneous deformation caused by overburden pressure,the landslide evolution mechanisms under the freeze-thaw action is analyzed.Results showed that:landslide evolution mechanisms under the freeze-thaw action are mainly on the deterioration of rock mass strength,the influence of fracture extension of rock mass in the process of transforma-tion from water to ice and the worsening effect in the process of blasting and unloading.