弃渣场地震动响应及失稳机制

一一大型振动台试验与数值模拟

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Abstract：To study the vibration response sensitivityand instability mode of sloping slag dump sites，this paper takes sloping slag dumpsas the research object，where theresults from numericalsimulations are compared to the resultsof shaking table model tests.The numerical simulations consider three major factors： Quaternary overburden，slag body layer，and ground motion of the original slope. Based on these simulations， we study the vibration response law and instabilitymodeofabandoned slag sites，and discusstheir instabilitymechanisms.Theresultsofthis studyshowthat： （1）theseismic response ofthe slag dump site increases withan increase ofslag height，slope，inclination angle of the Quaternary layer，and ground motion amplitude and frequency，and decreases withan increaseof the thickness of the Quaternary layer. （2）The sensitivities of the influencing factors of the sloping slag dump site in terms of the influencing factors of motion response are preliminarilyobtained， which showthe inclination angle of the Quaternary layer $$ the thickness of the Quaternary layer $$ the slope of the slag $$ the height of the slag dump （geometric parameters of the slag dump） $$ the amplitude of ground motion $$ the frequency of ground motion $$ the duration of ground motion （seismic parameters）. （3）Combined with the test results，threetypes of instability modes of slag dump underseismic actionwere identified：（1）the“slag-overburden interface slip”mode，（2）the“slag vibration colapse" mode，and （3） the“quaternary layer creep slip”mode. Based on the results，slag dumps are mainly afected by slag height，slope，and Quaternary inclinationangleunder seismicaction.Theresultsof thisstudy have important significance for site selection and stacking scheme designs of slag dumps，and the instability mode of the sloping slag dump proposed in this paper can provide a basis for the prevention and control measures of slag dumps.

Key words：slope-type dumpingsite；shaking table；numerical simulation；dynamic responsesensitivity analysis; destruction mode

中国西部山区是“西部大开发”“交通强国”“一带一路”与国防安全战略实施的高密度区，以铁路为代表的大型工程建设开挖产生的弃渣量巨大，堆积形成大量超大型弃渣场。（剩余19548字）