初始含水量对砂土泥石流启动影响作用分析

 利用自制小比例模型槽，结合可控降雨强度的降雨模拟器，进行人工降雨诱发泥石流的室内模型试验，着重研究不同初始含水量对砂性泥石流启动下滑过程的影响。基于滑坡型泥石流启动过程，利用精密的基质吸力测量仪器，对非饱和砂土黏聚力随含水量的变化关系进行研究。使用先进的高速动态数据采集仪和YEC-DASP数据分析系统进行孔压的量测与分析。运用GeoDog软件对堆积土体启动前的位移场进行分析，研究滑坡土体破裂面处水土作用关系。通过研究不同初始含水量堆积土体向泥石流转化的宏观破坏状态以及滑裂面位置，揭示初始含水量对堆积土体在启动过程中产生的影响。

INFLUENCE OF INITIAL WATER CONTENT ON SANDY DEBRIS FLOW STARTING PROCESS

Using the self-developed small-scale model flume,combined with the controllable intensity artificial rainfall simulator,the experiment of debris flow induced by artificial rainfall is carried out to study the influence of water content on the sandy soil flow starting process.Based on landslide type debris flow starting process,precise measuring instrument matrix suction is used to measure variation relation of soil cohesion with water content,and pore water pressure gauge is used to measure the performance of pore water pressure during rainfall process.Using software GeoDog,the sandy soil displacement field is analyzed before it turns to debris flow;and the relation of water-soil interaction on the slippery fracture is confirmed.By researching the macro damage state and the slippery fracture position of different initial water contents sandy soil,the influence of water content on the sandy soil flow starting process is revealed.