岩土工程学报2025，Vol.47Issue(7)：1392-1400,9.DOI:10.11779/CJGE20240115
高饱和度含气砂力学特性试验及状态相关本构模拟
Experimental study on mechanical properties of gassy sand with high degree of saturation and state-dependent constitutive modeling
摘要
Abstract
The special existence of gas in gassy sand makes its basic properties different from those of general unsaturated soils.To analyze the undrained mechanical properties and static liquefaction instability of gassy sand,this work extends the triaxial test system equipped with dual pressure chamber to achieve the preparation and triaxial tests on the gassy sand with high degree of saturation.Based on the modified triaxial test system,a series of triaxal tests on the saturated sand and gassy sand are conducted,and the second-order work criterion and determinant criterion for identifying static liquefaction of the gassy sand are proposed.The results show that a small amount of entrapped gas can significantly increase the shear strength and axial deformation requested for triggering static liquefaction,and thus improve its resistance to static liquefaction.The second-order work criterion implicitly includes the current strain path,which can accurately determine the triggering of static liquefaction of the gassy sand,while the determinant criterion is a necessary condition for the second-order work criterion,determining whether there is a strain path that makes the soils unstable under the current state,which is the lower limit of static liquefaction instability.关键词
高饱和度/含气砂/三轴试验/静态液化/二阶功准则/行列式准则Key words
high degree of saturation/gassy sand/triaxial test/static liquefaction/second-order work criterion/determinant criterion分类
建筑与水利引用本文复制引用
童森杰,黄茂松,时振昊,王滨..高饱和度含气砂力学特性试验及状态相关本构模拟[J].岩土工程学报,2025,47(7):1392-1400,9.基金项目
国家自然科学基金项目(11972260)This work was supported by the National Natural Science Foundation of China(Grant No.11972260) （11972260）
