黄土静态液化导致滑坡转化泥流致灾机理研究

通过大量的野外调查和室内试验，黄土滑坡在一定的条件下极易转化为远程滑坡，运动状态也从滑动转化为流动，形成泥流，在运动距离和流动速度上远远超出我们所预测范围，从而给黄土地区带来严重的危害。本研究围绕黄土强度劣化导致静态液化促使滑坡转化泥流为轴线，通过对典型滑坡转化泥流的野外调查，概化黄土滑坡转化泥流模式和特征，利用三轴试验、环剪试验和大型物理滑坡模型试验，研究黄土强度劣化导致土体液化转化泥流孔隙水压力增加和波动特征，解释孔隙水压力增加导致黄土强度降低以致产生静态液化的原因和机理，分析水动力、剪切（滑移）速率效应在黄土强度劣化滑坡转化泥流的影响，量化湿度（饱和度）、粒度（黏粒或粉粒含量）等对黄土强度劣化导致滑坡液化转化泥流的影响程度，揭示黄土强度持续劣化导致静态液化转化泥流致灾机理。研究成果有助于深化对黄土泥流的认识，丰富黄土灾害研究体系，并服务于黄土灾害预报和防治

The mud-flow, which with high velocity and long run-out and unexpected the results, initiation from landslide is distribution widely in the Loess Plateau, resulting in more and more catactrophic geo-hazards. This project focus on the mechanism of the mud-flow initiation from landslide due to loess static-liquefaction, summary the characters and model of the mud-flow initiation from landslide according to field investigation at the typical mud-flow events sites. Research the increase and fluctuation characters of pore-water pressure during the mud-flow initiation from landslide due to loess static-liquefaction using triaxial, ring-shear and physical model test, and explain the cause and mechanism of loess static-liquefaction, which resulting in mud-flow initiation from landslide, due to pore-water pressure increasing. Analysis the effect of the water and shear velocity in the process of the mud-flow initiation from landslide. Quantitative evaluation the effect of the saturation level, particle size in the process of the mud-flow initiation from landslide, and then propose the mechanism of the mechanism of the mud-flow initiation from landslide due to loess static-liquefaction. The results of the project will deepen understand the mud-flow, enhance the system of the loess geo-hazards and provide the guidance to mitigation and forecast the mud-flow in Loess plateau.