中文摘要：

为了研究临河碎石土路堤的稳定性,基于相似理论,通过离心模型试验,研究了不同坡率和分台阶的情况下,碎石土路堤在坡外水位上升过程中的稳定性,测量了试验过程中路堤内的孔隙压力,分析了试验机理。结果表明：在模拟水位上升约10 m的情况下,20 m高、坡比1∶1.75、压实度96.5%的碎石土路堤没有明显的滑动破坏,但有反映其不稳定的裂缝产生。如果这种路堤发生半幅跨塌等水毁事故,可能与堤基处理不好、水对路堤的冲刷等有关。如果路堤高度大,在空间上不允许用1∶1.75的放坡时,可以考虑1∶1.5的坡比,分台阶填筑;分台阶填筑路堤时,台阶平面与上边坡交界处是应力集中部位,在设计和施工时应注意防护。

英文摘要：

In order to study the stability of the detritus embankment along river in highway engineering,based on the similitude theory and the centrifuge test,the stability of detritus embankment of different slope ratios and steps during water level rises is analyzed.The pore pressure in the embankment is measured during the test.The mechanism of the test is analyzed.The test results show that the 20m-high detritus embankment with the slope ratio of 1∶1.75 and the compacting factor of 96.5% does not obviously slide during the water level rises by 10 m,but fissures are found in the model.It indicates the embankment is unstable to some degree.If this kind of embankment slides during a flood,it may relate to that the subgrade of the embankment is not reinforced effectively,or the embankment is eroded by the flood.If the embankment is so high that the slope ratio of 1∶1.75 is not allowed,the slope ratio of 1∶1.5 with steps may be considered.When embankment is constructed with steps,stress concentration would mostly take place between the step and upper slope.This should be paid attention to in design and construction.