爆炸荷载作用下三相饱和土中气体运动的几个影响因素分析

三相饱和土中的气体含量是决定爆炸波在其中传播的最重要因素，但目前理论上对其中气体运动的描述还不够准确。对影响三相饱和土应力应变关系递增硬化段气体运动的几个因素，包括表面张力、气泡周围介质的粘性和压缩性等进行了描述，并通过数值分析确定这些因素的影响程度。计算结果表明气泡表面张力和气泡周围介质的压缩性对气体运动的影响可以忽略不计，而气体本身的压缩特性和气泡周围介质的粘性是影响气体运动的主要因素。

ANALYSIS ON SOME INFLUENCE FACTORS TO GAS MOTION UNDER EXPLOSIVE LOADING IN THREE PHASE SATURATED SOIL

The gas content is the most important influence factor for explosive wave propagation in three phase saturated soil,however,up to now it is inadequate to describe the gas motion theoretically in this media.In the paper,some influence factors to gas motion,including the surface tension,the viscosity and compressibility of the media around the bubble etc.,are investigated for the increasing hardening part on the stress strain relation of the three phase saturated soil,the influence degree of these factors is studied by numerical method.The numerical results show that the influence of the surface tension and the compressibility of the media around the bubble can be neglected,and the compressibility of gas and the viscosity of the media around the bubble are the main influence sources.