高边坡岩体结构面各向异性检测与稳定性分析

来源期刊：中南大学学报(自然科学版)2006年第1期

论文作者：谢忠球 温佩琳 丁科

文章页码：160 - 164

关键词：道路工程;边坡;弹性波各向异性;结构面

Key words：road engineering; slope; elastic wave anisotropy; structural plane

摘    要：针对风化边坡岩体内存在对岩体强度有重要影响的定向排列裂隙结构软弱面及剪切带,从而导致边坡岩体的剪切波速度各向异性,分析了各向异性介质中弹性波的传播特征,论证了应用弹性波技术探测岩体结构面及其各向异性的可行性,提出了基于纵波震源、地震转换波技术的岩体结构面检测技术及动力学特性各向异性的测试方法,以西南某高速公路岩体边坡工程为例进行检测研究。研究结果表明:边坡结构面的反射波场具有各向异性特征,转换横波分量能量、频谱特征、测线交点处的闭合差是反映地层各向异性的重要指标参数;采用瞬态面波法可以反映岩体动力特性的各向异性特征。采用所提出的方法可以有效地反映边坡结构面及其各向异性,以确保边坡岩体的动力稳定。

Abstract: Within the weathered rock mass of slope, it is shown that the weathered layer contains some of the greatest values of shear velocity anisotropy, which results from structural weakness manifest as aligned open fracture and shear zones, and it can have significant implications for the strength of rock mass. Based on the analysis of wave velocity anisotropy. The feasibility of structural plane of rockmass was discussed, and methods for predicting the rockmass anistropy of slope was put forward by use of P-source and converted wave and SASW. The results show that many seismic characteristic parameters such as amplitude of shear-wave, frequency spectrum and closure are very important index sign parameters of anisotropy. The results can provide the abundant data for analysis dynamic stability of the rockmass.