【摘要】 基于室内动三轴试验方法研究了最大动孔隙水压力随最大偏应力和平均有效应力的变化规律,提出了砂质边坡最大动孔隙水的简化计算方法,将其代入永久位移的计算式中提出了可以考虑动孔隙水压力影响的边坡永久位移简便计算方法;通过开展室内振动台试验验证了永久位移简便计算方法的准确性,并进一步研究了地下水位对砂质边坡破坏模式的影响规律,最后提出了边坡基于性能的地震稳定性安全评价方法,并形成了一套结合永久位移的边坡地震稳定性评价新思路。研究表明,无地下水时,边坡的破坏开始于坡顶,表现出了明显的"鞭梢效应";在较高水位时边坡的破坏开始于坡脚,且边坡顶部有明显的震陷现象;通过将本文建立的边坡动孔隙水压力的简化关系式和永久位移简便计算方法与室内试验值进行了对比,验证了其准确性。最后建立了基于安全系数和永久位移的边坡地震稳定性评价体系为坡体稳定性判识提供参考。更多还原

【Abstract】 Change laws of the maximum dynamic pore water pressure with the largest deviatoric stress and the average effective stress based on the indoor dynamic triaxial test,and a simplified calculation methods of maximum dynamic pore water was put forward,and it is generated into the calculation formula of the permanent displacement,and the simple calculation method of the permanent displacement of slope considering the influence of dynamic pore water pressure was proposed. The accuracy of the simple calculation method of the permanent displacement was verified by shaking table test,and the influence law of underground water level on failure mode of sandy slope was further studied,and the evaluation method of the seismic stability safety of the slope based on performance was put forward,and a new idea of the evaluation of the seismic stability of the slope based on permanent displacement was formed. The results show that destruction of slope begins on the top and shows obvious lash effect without groundwater. Compared with the low water level,the destruction begins at the slope toe with high levels. Meanwhile,the position at the top of slope has obvious settlement phenomenon. The simplified relation of the dynamic pore water pressure and permanent displacement values were compared with indoor test values,which verified their accuracy. The evaluation system of the seismic stability of the slope based on permanent displacement and safety factor provides a reference for the slope stability.更多还原