基于高斯滤波技术的岩质边坡滑面搜索法研究

Study of the search method of slip surface of rock slope based on Gauss filter technology

为了确定岩质边坡滑面的形态与位置信息,先选取能够体现岩体强度衰减规律的非等比强度折减法对边坡进行稳定性分析.然后以单元体最大剪应变率作为特征量,沿纵横双向路径搜索每条直线上特征量达到最大值的点,并利用高斯平滑滤波技术对这些点数据进行光滑处理,建立了一种新的岩质边坡滑面搜索方法.最终,基于该方法分析了Hoek-Brown准则各强度参数及坡形参数对边坡滑面位置的影响规律.结果表明:随着地质强度指标GSI、单轴抗压强度σci的增大或坡角β的减小,边坡滑面埋深变大;而岩石材料常数mi、扰动系数D和坡高H则对滑面位置无明显影响.

In order to determine the shape and position of slip surface of rock slope,the non-proportional strength reduction method which can reflect the attenuation law of the rock mass strength was selected to analyze the stability of the slope.Then,taking the maximum shear strain rate of the element as the characteristic quantity,a new method of searching for slip surface of rock slope was established by searching the points of the characteristic quantity reaching the maximum value along the vertical and horizontal paths and smoothing the data of these points with Gauss filter technology.Finally,based on this method,the influence of the strength parameters of Hoek-Brown criterion and the slope shape parameters on the position of slip surface of the slope was analyzed.The results show that the depth of slip surface of the slope increases with the increase of GSI,σci,and the decrease of slope angle β,respectively.However,the intact rock material property mi,disturbance coefficient D and slope height H have no obvious influence on the location of slip surface.