【摘要】 利用GDS三轴系统4D应力路径模块进行了不同围压下含浅层生物气非饱和砂土的持水特征试验。分析不同围压对持水特征曲线形态的影响。结果表明随着围压的施加与增大,非饱和砂土持水能力逐渐减弱。应用所得持水特征曲线进行含浅层气砂土中气藏压力状态的分析预测,结果表明使用无围压下持水特征曲线进行预测是偏于安全的。更多还原

【Abstract】 Experiment study on shallow gassy unsaturated sand under different confining pressure with GDS triaxial system’s 4D stress path module is carried ont.Different forms of SWCC under different confining pressures are analyzed,the results show that unsaturated sand’s water storage capacity declines gradually with confining pressure’s infliction and accretion.Finally,shallow gassy sand’s gas reservoir pressure characteristics with SWCC are analyzed and forecasted,and it’s conservative if the same thing is done based on SWCC without confining pressure.更多还原