新疆大学学报（自然科学版中英文）2026，Vol.43Issue(3)：358-366,9.DOI:10.13568/j.cnki.651094.651316.2025.03.27.0002
地下施工扰动条件下饱和粉砂不排水失稳试验研究
Experimental Study on Undrained Instability of Saturated Silty Sand under Disturbance of Underground Construction
摘要
Abstract
Density reduction of saturated silty sand layers caused by construction disturbance of underground engineering in soft soil,can lead to pore-pressure accumulation under undrained loading and triggering instability.To investigate the me-chanical behavior of saturated silty sand under different levels of construction disturbance,a quantitative index is developed to characterize the degree of construction disturbance,based on which reconstituted specimens are prepared and tested using consolidated drained and consolidated undrained triaxial shear tests.The stress-strain curve analysis shows that,under low confining pressure,loose and medium-dense saturated silty sand exhibits static liquefaction accompanied by strain softening,and the extent of softening decreases with increasing confining pressure.Loose and medium-dense silty sand shows a higher susceptibility to static liquefaction under low confining pressure;low-density silty sand demonstrates a stronger liquefaction potential and a higher undrained brittleness index under low confining pressure.With increasing initial relative density,the re-gion between the failure line and the instability line in stress space shrinks,implying a reduced likelihood of static-liquefaction instability.关键词
地下工程/施工扰动/静态液化/粉砂/三轴试验Key words
underground engineering/construction disturbance/static liquefaction/silty sand/triaxial tests分类
建筑与水利引用本文复制引用
宋博文,朱长根,王章,杨阳,徐柯锋,王蓉,吕玺琳..地下施工扰动条件下饱和粉砂不排水失稳试验研究[J].新疆大学学报（自然科学版中英文）,2026,43(3):358-366,9.基金项目
国家自然科学基金面上项目"基于水力耦合静态液化失稳的盾构隧道施工诱发地面塌陷机理研究"(42172300). （42172300）
