大型高速岩质滑坡启程活动阶段孔隙流体压力效应

大型高速岩质滑坡在启程活动阶段由于高速摩擦产生高温 ,使滑带水突然汽化 ,产生巨大的水汽压力 ,并且可能产生水汽垫层。这气垫支持着滑体并产生润滑作用 ,使作用在滑动面上的有效法向压力显著降低 ,因抗滑力随法向压力的降低而减少 ,滑体可获得一巨大速度。以云南头寨大型高速岩质滑坡为原型通过计算证实了孔隙水汽化的可能性 ,并进一步计算了孔隙水汽化压力的大小

Pore Liquid Pressure of Large High-speed Rockslide in Initial Stage

Large high speed landslide may produce a very high increase in temperature,and convert the water in sliding zone into vapour, creating a cushion which sustains the slide mass. As a result, effective normal pressure reduces significantly under the sliding surface, and the sliding mass acquired the high velocity. It was proved by calculation on Touzhai large high speed rockslide in Yun'nan province that the water in sliding zone can be vaporized, and the value of steam pressure is calculated.