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工程科学与技术:2022,54(4):129-140
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高应力条件下双向激振时尾粉砂的动力特性
(1.西南科技大学 工程材料与结构冲击振动四川省重点实验室,四川 绵阳 621010;2.西南科技大学 土木工程与建筑学院,四川 绵阳 621010;3.中国科学院 武汉岩土力学研究所 岩土力学与工程国家重点实验室,湖北 武汉 430071;4.昆明理工大学 国土资源工程学院,云南 昆明 650093)
Investigation on Dynamic Behavior of Tailing Sands on the Bidirectional Vibration Under High-stress Conditions
(1.Shock and Vibration of Eng. Materials and Structures Key Lab. of Sichuan Province, Southwest Univ. of Sci. and Technol., Mianyang 621010, China;2.School of Civil Eng. and Architecture, Southwest Univ. of Sci. and Technol., Mianyang 621010, China;3.State Key Lab. of Geomechanics and Geotechnical Eng., Inst. of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China;4.Faculty of Land Resources Eng., Kunming Univ. of Sci. and Technol., Kunming 650093, China)
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投稿时间:2021-03-15    修订日期:2021-06-18
中文摘要: 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Kc(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εtp;随着动应力幅值的增大,εtp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。
Abstract: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 εtp when isobaric consolidation and anisotropic consolidation. With the increase of dynamic stress amplitude, εtp 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 consolidation were the same. Besides, through the analysis of the test results, the cumulative pore-pressure growth model of tailing sands under high-stress considering multiple factors was derived, and two forms of this model were obtained under isobaric consolidation and anisotropic consolidation. Thus, the research findings can provide a reference for the seismic reinforcement design of the tailings dam.
文章编号:202100214     中图分类号:TD315    文献标志码:
基金项目:国家重点研发计划项目(2017YFC0804600);国家自然科学基金面上项目(52174114)
作者简介:第一作者:刘俊新(1976-),男,教授,博士.研究方向:岩土力学与土体稳定性评价.E-mail:ljx0614@126.com;通信作者:张建新,E-mail:2372190159@qq.com
引用文本:
刘俊新,张建新,袁槐岑,张超,王光进.高应力条件下双向激振时尾粉砂的动力特性[J].工程科学与技术,2022,54(4):129-140.
LIU Junxin,ZHANG Jianxin,YUAN Huaicen,ZHANG Chao,WANG Guangjin.Investigation on Dynamic Behavior of Tailing Sands on the Bidirectional Vibration Under High-stress Conditions[J].Advanced Engineering Sciences,2022,54(4):129-140.