CAJ | 학술논문

受强震与极端天气事件的影响,泥石流阻塞大河事件呈急剧上升趋势,以往的研究多数针对泥石流堵断小河的物理过程,所建立的公式不适用于主河强水流作用下的泥石流阻塞大河问题.本文参考了Takahashi提出的泥石流在坡度变化沟道中的运动方程,考虑泥石流汇入主河后动力过程受主河水流阻力影响的因素,建立了泥石流进入主河后的运移距离计算公式;基于岷江典型河段实测和泥石流堵河水槽模型试验,确定了泥石流物质总量与堵塞系数之间的关系式;大直剪试验表明,当大颗粒体积比达到50%时,粗细混合料的抗剪强度由大颗粒所决定,据此提出堰塞坝形成稳定坝体的条件是抗水流冲刷的大颗粒所占比例达到50%以上,并通过现场资料对这一结论进行了验证.从而建立了基于泥石流在大河中运移距离、泥石流物质总量及泥石流体颗粒组构条件的泥石流阻塞大河综合判据.
수강진여겁단천기사건적영향,니석류조새대하사건정급극상승추세,이왕적연구다수침대니석류도단소하적물리과정,소건립적공식불괄용우주하강수류작용하적니석류조새대하문제.본문삼고료Takahashi제출적니석류재파도변화구도중적운동방정,고필니석류회입주하후동력과정수주하수류조력영향적인소,건립료니석류진입주하후적운이거리계산공식;기우민강전형하단실측화니석류도하수조모형시험,학정료니석류물질총량여도새계수지간적관계식;대직전시험표명,당대과립체적비체도50%시,조세혼합료적항전강도유대과립소결정,거차제출언새패형성은정패체적조건시항수류충쇄적대과립소점비례체도50%이상,병통과현장자료대저일결론진행료험증.종이건립료기우니석류재대하중운이거리、니석류물질총량급니석류체과립조구조건적니석류조새대하종합판거.
Debris flows damming of large river have increased sharply due to the large earthquake and ex?treme weather events. Previous studies focus on debris flow damming in streams. In this paper,an equation of the run-out distance of debris flow in the main river is proposed,based on the dynamic equation of de?bris flow at different slopes given by Takahashi. By undertaking field investigations and flume experiments, a new calculation method of the volume of debris flow damming large river is given. Using large shear test it was deduced that the large particles should comprise more than 50% for forming a stable debris flow dam. Hence,the criteria of debris flow damming of large river were presented in terms of run-out distance and grain composition debris flow.