CAJ | 학술논문

研究目的：大量研究结果表明地震波的持时、频率对加筋土挡墙的地震稳定性存在较为显著的影响，然而目前加筋土挡墙地震稳定性通常采用的拟静力法、极限位移法对其均不考虑。基于此，本文基于弹性波动理论，概化加筋土挡墙的动力分析模型，针对可延展性和不可延展性两种加筋材料，利用水平分层法建立受力平衡微分方程，借助 Hilbert －Huang 变换，提出地震作用下加筋土挡墙地震稳定性的时频分析方法，为加筋土挡墙及其他类型支挡结构的抗震设计提供指导。研究结论：（1）提出了地震作用下能够考虑地震波三要素（峰值、频率以及持时）影响的加筋土挡墙地震稳定性的时频分析方法；（2）分析了筋材类型、地震烈度、填土内摩擦角以及输入波频率等单因素对加筋土挡墙筋材所需拉力总和的影响，结果表明：随着填土内摩擦角的减小、地震烈度的增大，加筋土挡墙地震稳定性变差，筋材所需拉力总和大幅增加，可延展性筋材所需拉力总和明显高于不可延展性筋材，筋材所需拉力总和随输入波频率的增大呈马鞍形分布，并且在输入波频率与加筋土挡墙系统自振频率相近时达到最大值；（3）对于可延展性筋材和不可延展性筋材来讲，按照现有规范只考虑峰值地震动不考虑输入波频率进行加筋土挡墙地震稳定性设计，可能会降低挡墙的地震安全储备；（4）随着填土内摩擦角的增加，主动破裂角逐渐增加；墙后填土的主动破裂角随地震动峰值加速度的增加而减小。
연구목적：대량연구결과표명지진파적지시、빈솔대가근토당장적지진은정성존재교위현저적영향，연이목전가근토당장지진은정성통상채용적의정역법、겁한위이법대기균불고필。기우차，본문기우탄성파동이론，개화가근토당장적동력분석모형，침대가연전성화불가연전성량충가근재료，이용수평분층법건립수력평형미분방정，차조 Hilbert －Huang 변환，제출지진작용하가근토당장지진은정성적시빈분석방법，위가근토당장급기타류형지당결구적항진설계제공지도。연구결론：（1）제출료지진작용하능구고필지진파삼요소（봉치、빈솔이급지시）영향적가근토당장지진은정성적시빈분석방법；（2）분석료근재류형、지진열도、전토내마찰각이급수입파빈솔등단인소대가근토당장근재소수랍력총화적영향，결과표명：수착전토내마찰각적감소、지진열도적증대，가근토당장지진은정성변차，근재소수랍력총화대폭증가，가연전성근재소수랍력총화명현고우불가연전성근재，근재소수랍력총화수수입파빈솔적증대정마안형분포，병차재수입파빈솔여가근토당장계통자진빈솔상근시체도최대치；（3）대우가연전성근재화불가연전성근재래강，안조현유규범지고필봉치지진동불고필수입파빈솔진행가근토당장지진은정성설계，가능회강저당장적지진안전저비；（4）수착전토내마찰각적증가，주동파렬각축점증가；장후전토적주동파렬각수지진동봉치가속도적증가이감소。
Research purposes:A large of research results show that there are more significant effect of the duration time and frequency on seismic stability of reinforced retaining wall.However,the common methods are pseudo -static method and limited displacement method at present,which can not consider the duration time and frequency of input wave.Therefore,based on the elastic wave theory,this paper summarizes the dynamic analysis model of the reinforced retaining wall,establishes the force equilibrium differential equation by horizontal slices analysis method,puts forward the time -frequency analysis method of the seismic stability of reinforced retaining wall under the action of earthquake by Hilbert -Huang transform,which can provide some valuable references for the time frequency seismic design of the reinforced retaining wall and other retaining structures. Research conclusions:(1 )A time -frequency analysis method of the internal anti -seismic stability analysis of the retaining wall is proposed considering the three elements of seismic waves (peak,frequency and duration).(2)The influence of the lacing wires types,the seismic intensity,internal frictional angle of the filling earth and the frequency of the input earthquake wave on the needed total tensile force of the lacing wires is analyzed,which is that the needed total tensile force of the lacing wires increases with the increase of the seismic intensity and the decrease of the internal frictional angle;the needed total tensile force of the expandability lacing wires is bigger than that of the non -expandability lacing wires;the needed total tensile force of lacing wires is distributed in the shape of saddle and the force achieves the maximum value when the frequency of the input wave is the same as the natural frequency of the reinforced retaining wall.(3)If the reinforced retaining wall is designed according to the rules considering only the peak ground motion not input wave frequency,the emergency capacity of the reinforced retaining wall will be reduced.(4)The active crack angle gradually increases with the increase of internal frictional angle,however,the active crack angle of earth filling behind retaining wall gradually decreases with the increase of internal frictional angle.