CAJ | 학술논문

利用自主设计的小比例尺模型槽，采用粗砂(1~2 mm)和细砂(0.075~0.25 mm)按照不同质量比例制作模型，在人工降雨条件下研究了不同的颗粒组分对砂性土泥石流形成形态的影响.模型试验研究发现，随着细砂含量由20%增加至100%，泥石流破坏形态由分级块体滑落向整体流滑型转变.利用GeoDog软件分析位移场，利用孔压计测量孔压变化.研究发现：分级块体滑落破坏过程存在明显的潜在滑动面的发展，孔压随裂缝的产生而耗散、随雨水渗入裂缝而升高，呈波浪式下降；整体流滑型突发性强，破坏前没有明显滑动面出现，孔压呈一次性陡降.通过测定启动过程单位时间启动量发现，流滑型破坏单位时间启动量大于分级块体滑落型.分层块体滑落形成机理为土体渗透系数大，雨水快速渗透破坏坡脚，使上部土体失去支撑而分层坍塌；流滑型破坏机理为土体渗透系数小，后部高度饱和呈流态化推动坡脚土体快速下滑.基于室内模型试验，初步分析了缩尺试验条件下降雨诱发泥石流形成形态机理，为降雨诱发泥石流的进一步研究提供参考.
이용자주설계적소비례척모형조，채용조사(1~2 mm)화세사(0.075~0.25 mm)안조불동질량비례제작모형，재인공강우조건하연구료불동적과립조분대사성토니석류형성형태적영향.모형시험연구발현，수착세사함량유20%증가지100%，니석류파배형태유분급괴체활락향정체류활형전변.이용GeoDog연건분석위이장，이용공압계측량공압변화.연구발현：분급괴체활락파배과정존재명현적잠재활동면적발전，공압수렬봉적산생이모산、수우수삼입렬봉이승고，정파랑식하강；정체류활형돌발성강，파배전몰유명현활동면출현，공압정일차성두강.통과측정계동과정단위시간계동량발현，류활형파배단위시간계동량대우분급괴체활락형.분층괴체활락형성궤리위토체삼투계수대，우수쾌속삼투파배파각，사상부토체실거지탱이분층담탑；류활형파배궤리위토체삼투계수소，후부고도포화정류태화추동파각토체쾌속하활.기우실내모형시험，초보분석료축척시험조건하강우유발니석류형성형태궤리，위강우유발니석류적진일보연구제공삼고.
An experiment of debris flow was carried out to study the influence of grain size distribution on starting progress mode by using the self-developed small-scale model flume under the condition of artificial rainfall.By using coarse sand (1~2 mm)and fine sand (0.075~0.25 mm),the model was made according to the quality ratio.Model test study finds that,with fine content increasing from 20%to 100%,failure pattern changes from layered and clumpy slide to fluidized flow.By using GeoDog software to analyze displacement and a pore pressure gauge to measure pore pressure changes,we have found sliding plane developing in layered and clumpy slide,and pore pressure decreasing with crack generation,and increasing with water seeping into crack.There is no crack development in fluidized flow, and pore pressure momentarily drops to a small value when damage occurs.The average volume of the starting for flu-idized flow is bigger than that for layered and clumpy slide.The formation mechanism for layered and clumpy slide is that water penetrates quickly,causing slope foot damage,and the slope collapses for losing support.For fluidized flow,the permeability coefficient is small,the soil of the back is highly saturated,and liquid causes the slope to de-cline rapidly.Based on the indoor model test of rainfall-induced debris flow,the formation mechanisms of debris flow modes were summarized.