考虑岩土体流变特性的强度折减法研究

用强度折减法分析边坡稳定性时,不需要事先假定滑面的位置和形状,具有较强的适用性.但在岩土体的力学性质方面仅考虑其弹塑性,而忽略了岩土体的流变性.流变是岩土材料的基本力学特性,很多边坡产生大变形乃至失稳都与岩土体流变具有一定关系.采用强度折减原理,分析了岩土体流变特性对边坡变形及稳定的影响.研究表明,岩土材料的流变特性使强度折减时每点的变形值增大,对边坡稳定具有不利影响.

Study on strength reduction technique considering rheological property of rock and soil medium

Strength reduction technique (SRT) is applicable in evaluating the stability of slope in most cases, because it doesn’t need to assume the location and shape of failure surface. But SRT considers only the elastoplastic properties of rock and soil media, neglecting the rheological property. Rheology is basic mechanical property of rock and soil medium. Having some relations to rheology, many slopes occur large deformation or even lose stability in fact. Based on SRT, the effect of rheology on slope deformation and stability is analyzed. The final research shows that the rheological properties of rock and soil media make deformation of every point more large; furthermore it makes slope more dangerous.