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高应力条件下双向激振时尾粉砂的动力特性

Investigation on Dynamic Behavior of Tailing Sands on the Bidirectional Vibration Under High-stress Conditions
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摘要 强地震荷载作用下,P波(纵波)对土体的作用不可忽略。然而,传统的采用单向振动分析循环荷载作用下土体动力特性的方法往往忽略了纵波对土体动力稳定性的影响。为研究高应力条件下尾粉砂的动力特性,采用双向激振循环荷载模拟地震荷载,开展一系列不同围压、不同动剪应力比CSR,以及不同固结应力比K_(c)(简称固结比)条件下的双向振动三轴试验。结果表明:在双向激振循环荷载作用下,等压和偏压固结时,饱和尾粉砂试样均存在转折累积塑性变形ε_(tp);随着动应力幅值的增大,ε_(tp)与等压固结时的振次呈线性负相关,与偏压固结时的振次呈线性正相关;尾粉砂的累积动孔压比增长曲线具有明显的阶段性,围压对尾粉砂累积动孔压比增长曲线的形态具有显著影响。围压相同时,动剪应力比、固结应力比的改变对累积动孔压比增长曲线的形态影响不大。随着围压的增大,在等压和偏压固结条件下,尾粉砂的累积动孔压比增长曲线均有两种模式(3或4个发展阶段);当累积动孔压比增长曲线为3个阶段时,等压和偏压固结条件下,曲线形态具有一定的差异;当累积动孔压比增长曲线为4个阶段时,等压和偏压固结条件下,曲线形态基本相同。同时,通过分析试验结果,提出尾粉砂在高应力条件下考虑多因素时的累积孔压增长模型,并得到等压固结和偏压固结时该模型的两种表现形式。研究成果可以为尾矿坝的抗震加固设计提供一定的参考。 The effect of P-wave(longitudinal wave)on soil under strong earthquake motions cannot be ignored.However,the traditional method of analyzing the dynamic behavior of soil under cyclic loading by unidirectional vibration often ignores the influence of P-wave on the dynamic stability of the soil.To study the dynamic characteristics of tailing sands under high stress,a series of bidirectional vibration triaxial tests under different confining pressures,dynamic shear stress ratios,and consolidation stress ratios were carried out adopting bidirectional cyclic loads to simulate seismic loads.The result showed that under bidirectionally excited cyclic loading,the saturated tailing sands had a cumulative plastic deformation ε_(tp) when isobaric consolidation and anisotropic consolidation.With the increase of dynamic stress amplitude,ε_(tp) had a linear negative correlation with the vibration’s times during isobaric consolidation,and a linear positive correlation with the vibration’s times during anisotropic consolidation;the cumulative pore-pressure curves of tailing sands were characteristic of stages.Confining pressure had a significant effect on the characteristic of the cumulative pore-pressure curves of tailing sands.When the confining pressure was the same,changes in the dynamic shear stress ratio and consolidation stress ratio had little effect on the characteristic of the cumulative pore-pressure curves.With the increase of confining pressure,the cumulative pore-pressure curves of tailing sands under isobaric consolidation and anisotropic consolidation had two development modes of 3 or 4 development stages.When the cumulative pore-pressure curves had three stages,the characteristic of the cumulative pore-pressure curves of tailing sands under isobaric consolidation and anisotropic consolidation had a significant difference.However,when the cumulative pore-pressure curves had four stages,the characteristics of the cumulative pore-pressure curves of tailing sands under isobaric consolidation and anisotropic co
作者 刘俊新 张建新 袁槐岑 张超 王光进 LIU Junxin;ZHANG Jianxin;YUAN Huaicen;ZHANG Chao;WANG Guangjin(Shock and Vibration of Eng.Materials and Structures Key Lab.of Sichuan Province,Southwest Univ.of Sci.and Technol.,Mianyang 621010,China;School of Civil Eng.and Architecture,Southwest Univ.of Sci.and Technol.,Mianyang 621010,China;State Key Lab.of Geomechanics and Geotechnical Eng.,Inst.of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China;Faculty of Land Resources Eng.,Kunming Univ.of Sci.and Technol.,Kunming 650093,China)
出处 《工程科学与技术》 EI CSCD 北大核心 2022年第4期129-140,共12页 Advanced Engineering Sciences
基金 国家重点研发计划项目(2017YFC0804600) 国家自然科学基金面上项目(52174114)。
关键词 高应力 尾粉砂 动力特性 双向激振循环荷载 塑性变形 孔压增长模型 high-stress tailing sand dynamic behavior bidirectional cyclic load plastic deformation pore-pressure growth model
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