饱和砂土气动液化试验研究  

Experimental Study on Gas-driven Liquefaction of Saturated Sand

作　　者：袁徐康 杨洋[1] YUAN Xukang;YANG Yang(Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing 210024,China)

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京210024

出　　处：《粉煤灰综合利用》2022年第1期25-31,共7页Fly Ash Comprehensive Utilization

基　　金：国家自然科学基金青年科学基金(42002288)。

摘　　要：针对海底浅层气、天然气水合物分解等气体运动会造成海底沉积物土层液化,引发海底麻坑、海底滑坡破坏等问题,通过一维土柱注气试验,研究气体作用下饱和土体的液化压力和液化深度。结果表明:试验过程中,土体内部孔隙气压出现先升高后下降的趋势;根据多孔介质流体质量守恒方程,不同深度处气压峰值的计算预测值与实际试验测量值较为吻合;将峰值孔隙气压与该深度处土体的水平应力相比较,可以较为准确地得到土体流化深度。In view of the problems that the gas migration such as submarine shallow gas and the decomposition of natural gas hydrate will cause the liquefaction of submarine sediment, and lead to the destruction like pockmark and landslide, the liquefaction pressure and liquefaction depth of saturated soil under the effect of gas are explored through one-dimensional soil column gas injection test.The results show that the pore gas pressure in the soil increases first and then decreases;according to the mass conservation equation of porous media, the measured peak pore gas pressure at different depths agree well with the actual experimental values;comparing the peak pore gas pressure with the horizontal stress of the soil, the soil fluidization depth can be obtained accurately.

关 键 词：气压 土柱试验 饱和土 液化 水平应力 

分 类 号：TU41[建筑科学—岩土工程]