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三峡库区发育大量软硬相间斜坡岩体,其变形机制复杂多变。以涪陵岩上危岩体为例,分析塑流-拉裂型斜坡的变形控制因素为厚层软基;以云阳云江路高边坡为例,分析压致-拉裂型斜坡的变形控制因素为薄夹层。采用应力分析的方法,对两种类型的岩体破坏进行了分析。塑流-拉裂型斜坡岩体以岩石的拉张破坏为主;滑移-压致拉裂型斜坡岩体以岩石的压张破坏为主。两种模式在结构上的差别为软岩厚度的差别。以巫山望霞危岩体为例说明,当软岩厚度处于相间位置时,其变形模式为复合模式。因此斜坡内部的岩体结构类型与斜坡变形破坏地质力学模式有着密切关系,斜坡结构变化则变形模式相应变化,其模式可能为过渡的复合式。这一认识对判断单个平缓软硬相间斜坡的变形问题具有积极的指导意义。
The Three Gorges reservoir area develops a large number of soft rock and soft rock slope between the rock, the deformation mechanism is complicated and changeable. Taking the dangerous rock mass in Fuling as an example, the deformation control factor of the plastic flow-pull type slope is analyzed as thick soft foundation. Taking the high slope of Yunjiang Yunyang Road as an example, the deformation control of the compressive-pull type slope is analyzed The factors for the thin sandwich. Using the stress analysis method, the damage of two types of rock mass is analyzed. The plastic flow-detritus-type slope rock mass is dominated by the tensile failure of the rock; the slip-compression-induced detritus-type slope rock mass is dominated by rock compression. The difference in structure between the two modes is the difference in soft rock thickness. Taking Wangxia dangerous rock body in Wushan as an example, when the thickness of soft rock is in the interphase position, the deformation mode is compound mode. Therefore, the type of rock mass inside the slope is closely related to the geomechanical model of slope deformation and failure, and the deformation pattern of slope structure changes correspondingly, and the model may be a compound of transition. This understanding has a positive guiding significance for judging the deformation of a single ramp between soft and hard phases.