基于斜坡变形演化的岩体强度估算方法

由于斜坡岩体所受的应力场在空间上具有分区性，导致相同岩性与结构特征的岩体其强度参数是不同的。研究斜坡变形演化过程中应力场的空间分布特征，揭示斜坡演化过程对岩体强度参数的影响，对斜坡岩体稳定性评价与优化设计起着举足轻重的作用。以北盘江善泥坡水电站上坝址岩体为例，在工程地质岩组划分的基础上，利用Hoek-Brown强度准则初步估算各岩组强度参数；恢复斜坡的原始地形并建立相应的数学力学模型，根据斜坡不同时期的变形演化特点,应用FLAC3D软件模拟斜坡岩体变形演化过程中应力场的空间分布特点，以此为基础进一步划分上述岩组，最后根据岩体所受的真实应力与Hoek-brown准则估算新分组后的斜坡岩体强度参数，得出更加符合实际情况的强度参数。 

Estimating method of rockmass strength parameters based on slope deformation process

Rockmass strength parameters depend to some extent on stress values acted on the rockmass. Strength parameters of rockmass, which have the same rock properties and structure, are different because of different stress values acted on the rockmass in the space distribution. Based on the slope deformation process analysis, slope stress spatial distribution is evaluated and influence of rockmass strength parameters is revealed in the process of slope deformation evolvement. The study plays an significant role in stability evaluation and engineering optimization design. Taking the rockmass in upper dam site of Shannipo hydropower station as an example, based on partition of engineering geology petrofabric, primary shear strength parameters of rockmass are estimated by Hoek-Brown criteria. Geological mechanical model, for which original topographty is renewed, is established. According to slope deformation process, spatial distribution properties of stress values are discussed by FLAC3D software. A subdivided engineering geological petrofabric, from which slope stress properties are considered, is determined and strength parameters, which made the result more reasonable, are estimated.