高应力条件下单、双向激振时饱和尾粉砂的动力特性研究  

Investigation on the dynamic characteristics in unidirectional and bidirectional vibration of saturated tail sand under high stress conditions

作　　者：刘俊新[1,2,3] 张建新 袁槐岑 王光进[3,4] 樊晓一 李晓宁[1,2] LIU Junxin;ZHANG Jianxin;YUAN Huaicen;WANG Guangjin;FAN Xiaoyi;LI Xiaoning(Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province,Southwest University of Science and Technology,Mianyang 621010,China;School of Civil Engineering and Architecture,Southwest University of Science and Technology,Mianyang 621010,China;State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China;Faculty of Land Resources Engineering,Kunming University of Science and Technology,Kunming 650093,China;School of Civil Engineering and Surveying,Southwest Petroleum University,Chengdu 610500,China)

机构地区：[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 [5]西南石油大学土木工程与测绘学院,四川成都610500

出　　处：《地震工程与工程振动》2021年第6期1-10,共10页Earthquake Engineering and Engineering Dynamics

基　　金：十三五国家重点研发计划(2017YFC0804600)。

摘　　要：由于土体的各向异性,在高应力条件下无法克服单向激振中产生的球应力对轴向累积塑性变形和孔压的影响,为了获取动球应力对饱和尾粉砂动力特性的影响规律,开展了一系列从低到高10种围压下单、双向激振不排水循环三轴试验,研究结果表明:在试样不发生结构性破坏时,单、双向振动形式对饱和尾粉砂的动力特性的影响可以视为等效,而在试样发生破坏时,从低应力到高应力的过程中,动球应力对单向激振时饱和尾粉砂孔压和轴向塑性变形的累积有明显的先促进后约束的作用。同时,通过对试验结果的分析,初步建立了高应力条件下饱和尾粉砂的累积动孔压的增长模型。该成果对地震荷载作用下尾矿坝体的动力稳定性研究具有一定的参考意义。Due to the anisotropy of the soil,it is difficult to overcome the influence of the spherical stress generated in unidirectional vibration on the axial accumulative plastic deformation and pore pressure under high stress conditions.In order to obtain the influence of dynamic spherical stress on the dynamic mechanical characteristics of saturated tail sand,a series of undrained triaxial tests under 10 confinement levels from low to high subjected to unidirectional and bidirectional vibration were carried out.The results show that:the influence of unidirectional and bidirectional vibration modes on the dynamic characteristics of saturated tail sand can be considered as equivalent if no structural damage happen,but when the sample is damaged,in the stress process from low to high,the dynamic spherical stress can promote first and then inhibit the accumulation of pore water pressure and axial plastic deformation of saturated tail sand under unidirectional vibration.At the same time,through the analysis of the test results,the accumulative dynamic pore pressure growth models of saturated tail sand under high stress conditions were preliminarily established.This result has certain reference significance for studying the stability of tailings dams under seismic loads.

关 键 词：高应力 球应力 塑性变形 孔压 尾粉砂 

分 类 号：TD315[矿业工程—矿井建设]