地震作用下深海含气能源土动力特性试验研究  

Experiment on dynamic characteristics of deep-sea gas-bearing energy soil under seismic loading

作　　者：王滢 刘嘉怡 高盟 孔祥霄[1,2] WANG Ying;LIU Jia-yi;GAO Meng;KONG Xiang-xiao(College of Civil Engineering and Architecture,Shandong University of Science and Technology,Qingdao,Shandong 266590,China;Shandong Province Key Laboratory of Civil Engineering Disaster Prevention and Mitigation,Shandong University of Science and Technology,Qingdao,Shandong 266590,China)

机构地区：[1]山东科技大学土木工程与建筑学院,山东青岛266590 [2]山东科技大学山东省土木工程防灾减灾重点实验室,山东青岛266590

出　　处：《岩土力学》2025年第2期457-466,共10页Rock and Soil Mechanics

基　　金：山东自然科学基金项目(No.ZR2023ME055)。

摘　　要：目前对深海含气能源土的研究多关注于相对平衡状态下以小气泡为主的含气土,且试验中多用施加正弦波来代替地震波。因此,提出一种能控制气泡尺寸及含量的方法,将地震波加速度时程曲线转化为应力时程曲线代替正弦波,通过动三轴试验探究地震作用下不同组分含气土的动力特性。试验表明:在地震荷载作用下,随围压的变化含气土破坏形式也发生变化,包括压缩破坏和拉伸破坏;不同黏土含量表现的破坏形式既有应变破坏,也有液化破坏,高黏土含量含气土刚度及抗剪强度皆下降,但塑性变形能力增强;有效围压对含气土的影响显著,随着饱和度降低,土体动强度越低,有效围压的影响效果越明显。Current research on deep-sea gas-bearing energy soils primarily focuses on soils with small air bubbles in a relatively stable state.Sinusoidal waves are commonly used in experiments to simulate seismic waves.Therefore,the authors propose a method to control bubble size and content,converting the acceleration time-history of seismic waves into stress time-history curves to replace sinusoidal waves.Dynamic triaxial tests are conducted to investigate the dynamic characteristics of various components of gasbearing soils under seismic condition.The experiments show that under seismic loading,the failure modes of gas-bearing soils vary with confining pressure,including compression and tension failures.Different clay contents exhibit both strain failure and liquefaction failure.Higher clay content results in decreased stiffness and shear strength,but increased plastic deformation capacity of gas-bearing soils.Effective confining pressure significantly impacts gas-bearing soils.As saturation decreases,dynamic strength of soils diminishes,and the influence of effective confining pressure becomes more pronounced.

关 键 词：深海含气能源土 地震荷载 动三轴试验 破坏形式 动力特性 

分 类 号：TU443[建筑科学—岩土工程]