岩石力学与工程学报
巖石力學與工程學報
암석역학여공정학보
CHINESE JOURNAL OF ROCK MECHANICS AND ENGINEERING
2015年
z1期
3256-3266
,共11页
屈永平%朱静%卜祥航%常鸣%唐德胜
屈永平%硃靜%蔔祥航%常鳴%唐德勝
굴영평%주정%복상항%상명%당덕성
土力学%林芝%冰川降雨型泥石流%物理实验%孔隙水压力%水位
土力學%林芝%冰川降雨型泥石流%物理實驗%孔隙水壓力%水位
토역학%림지%빙천강우형니석류%물리실험%공극수압력%수위
soil mechanics%Nyingchi area%glacial-rainfall type debris flow%physical experiment%pore water pressure%water levels
近年来,由于全球气温升高,导致西藏地区泥石流暴发频率增加,其中包括冰川降雨型泥石流灾害。以西藏林芝地区的冰川降雨型泥石流为研究对象,首次通过观测冰川降雨型泥石流起动过程中水位、孔隙水压力等变化特征,得到水位、孔隙水压力与堆积坡度、堆积厚度的关系以及沟道物质起动特征,根据水位、空隙水压力的时间变化特征,得到不同试验条件下水位与孔隙水压力的相互关系。通过相似物理实验,分析实验过程中流量、流深、流速等参数与泥石流堆积坡度、堆积厚度的关系,并将冰川降雨型泥石流起动分为前期饱和阶段、起动阶段、堆积阶段。由相似比得到研究区典型冰川泥石流起动的流深、流速等野外观测结果与实验结果与一致,为研究区冰川降雨型泥石流的研究提供参考。
近年來,由于全毬氣溫升高,導緻西藏地區泥石流暴髮頻率增加,其中包括冰川降雨型泥石流災害。以西藏林芝地區的冰川降雨型泥石流為研究對象,首次通過觀測冰川降雨型泥石流起動過程中水位、孔隙水壓力等變化特徵,得到水位、孔隙水壓力與堆積坡度、堆積厚度的關繫以及溝道物質起動特徵,根據水位、空隙水壓力的時間變化特徵,得到不同試驗條件下水位與孔隙水壓力的相互關繫。通過相似物理實驗,分析實驗過程中流量、流深、流速等參數與泥石流堆積坡度、堆積厚度的關繫,併將冰川降雨型泥石流起動分為前期飽和階段、起動階段、堆積階段。由相似比得到研究區典型冰川泥石流起動的流深、流速等野外觀測結果與實驗結果與一緻,為研究區冰川降雨型泥石流的研究提供參攷。
근년래,유우전구기온승고,도치서장지구니석류폭발빈솔증가,기중포괄빙천강우형니석류재해。이서장림지지구적빙천강우형니석류위연구대상,수차통과관측빙천강우형니석류기동과정중수위、공극수압력등변화특정,득도수위、공극수압력여퇴적파도、퇴적후도적관계이급구도물질기동특정,근거수위、공극수압력적시간변화특정,득도불동시험조건하수위여공극수압력적상호관계。통과상사물리실험,분석실험과정중류량、류심、류속등삼수여니석류퇴적파도、퇴적후도적관계,병장빙천강우형니석류기동분위전기포화계단、기동계단、퇴적계단。유상사비득도연구구전형빙천니석류기동적류심、류속등야외관측결과여실험결과여일치,위연구구빙천강우형니석류적연구제공삼고。
In recent years,with the global temperatures rising,the frequency of debris flow breakout events has increased,which includes glacial-rainfall type debris flow disasters in Tibet region. This paper will set the glacial- rainfall debris flow gully in Nyingchi of Tibet area as the research object,by observing the vary characteristics of water levels,pore water pressure in the starting process for the first time to get the relationship and its starting characteristics by water levels,pore water pressure,the slope,and the thickness of accumulation. By similar physical experiments,relationship of the experimental parameters among flow rate,flow depth,velocity and the slope,thickness of debris flow accumulation,the vary relationship of water level and pore water pressure are analyzed,according to the time relationship of the water level,pore water pressure under different test conditions, we could define the glacial-rainfall type debris flow starting process,which consists of early stage of saturated phase,starting phase and accumulation stage. The experimental results of flow depth,velocity are consistent with the field observation results of typical glacial debris flow in the study area,which are obtained by ratio of similitude provides the reference for the glacial-rainfall type debris flow study in research area.