【摘要】 以汶川强震区水力类泥石流为研究对象进行室内试验,研究水力类泥石流起动过程中水位和孔隙水压力的变化特征。结果表明,在水力类泥石流起动试验初期,水位值和孔隙水压力值的增值相对平缓;泥石流起动过程中,水位值和孔隙水压力值突增,与试验槽坡度均呈正相关;泥石流结束时刻,由于沟道堆积物的搬运和侵蚀,水位值出现负值,而孔隙水压力值趋近于0;不同试验槽坡度水力类泥石流暴发时间顺序为9°<12°<15°。研究成果可为震区水力类泥石流运动机制研究提供参考。更多还原

【Abstract】 Taking the hydraulic debris flow in Wenchuan earthquake area as laboratory test object, the variation characteristics of water level and pore water pressure during the starting process of hydraulic debris flow are studied. The results show that,( a) the increment of water level and pore water pressure is relatively gentle in initial stage of debris flow start-up test;( b) during debris flow start-up, the water level and pore water pressure increase sharply, which is positively correlated with the slope of test trough;( c) in the end of debris flow, the water level appears as negative value, while the pore water pressure tends to zero due to the transportation and erosion of channel deposits; and( d) the outbreak time sequence of hydraulic debris flow in different test troughs is 9° < 12° < 15°. These research results can provide a reference for studying the mechanism of hydraulic debris flow movement in earthquake area.更多还原