注浆效应对边坡稳定性的影响

Analysis of grouting effect on stability of slope

通过分析注浆后边坡岩土材料的粘结力c和内摩擦角φ对稳定性的影响程度,得出注浆效应对边坡稳定性的影响。通过理论分析发现,基于理想弹塑性本构模型的Mohr-Coulomb准则,运用拉格朗日元法(FLAC3D)建立均质边坡计算模型,分析在不同坡角情况下,不同粘结力c和内摩擦角φ的变化系数Kc和Kφ与安全系数F的关系,从而表征c和φ对于稳定性的影响程度。研究结果表明:注浆后,粘结力有较大提高,而内摩擦角的提高幅度较小;存在一等效影响角θe(θe=34.1 °),当坡角β=θe时,c和φ对稳定性的影响程度相同;当坡角β<θe时,φ对稳定性的影响程度比c的影响程度大;当β>θe时,c对稳定性的影响程度比φ的影响程度大。

By analyzing the influence degree of cohesion c and friction angle φ of geotechnical materials of slope after grouting, the grouting effect on the stability of slope was calculated. Based on perfectly elastoplastic constitutive model, Mohr-Coulomb criterion, the numerical simulation technique of fast lagrangian analysis of continua （FLAC^3D） was used to build calculation models for isotropic slope. The analysis was made to find out the relationships among cohesion varying coefficient Kc, friction angle varying coefficient Kφ and safety factor F with different slope angles ft. The results show that after grouting, the value of cohesion increases by a large amount while the value of friction angle increased by a small amount. The analysis results can reflect the influence degrees of cohesion and friction angle on the stability of slope. There exists a equivalent influence angle θe（θe=34.1°）, if β=θe, cohesion and friction angle have the similar influence on the stability of slope; if β〈θe, friction angle has larger influence than that of cohesion; if β〉θe, cohesion has larger influence than that of friction angle.