【摘要】 多年冻土区斜坡路基的稳定性关系到青藏线格拉段的运营畅通。为研究地震荷载对多年冻土区斜坡路基稳定性的影响,根据现场钻孔及室内土工试验土层参数,针对多年冻土区典型斜坡路基工点,考虑地震荷载作用下,采用边坡稳定性动力分析方法,对有车和无车2种工况,进行了无加固措施情况及抗滑桩情况的稳定性分析和对比研究,明确了抗滑桩提高冻土区斜坡路基稳定性的效果,建议使桩伸入到稳定岩土层下的长度不小于总桩长的1/3,以满足抗滑桩设计和稳定性的要求,为青藏线多年冻土路基加固的设计、施工等提供参考。更多还原

【Abstract】 The stability of permafrost sloping subgrade relates to the unblocked operation of Qinghai-Tibet Railway. To study the influence of earthquake on the stability of permafrost sloping subgrade,on the basis of soil parameters determined by field drilling and geotechnical tests,the stabilities of such embankment with no stabilization measures as well as that with anti-slide piles under earthquake were analyzed,using the dynamic analysis method of slope stability. Comparison research with and without train running on the line was carried out. The effects of improvement of anti-slide piles on the stability of permafrost sloping subgrade were made clear. It is suggested that the length of the pile inserted into the stable rock is not less than 1/3 of the whole pile length so as to meet the need of reliability and stability requirements which can make a reference for the stabilizing design and construction of permafrost sloping subgrade on Qinghai-Tibet Railway.更多还原