| 王家鑫,夏元友,王智德.考虑滑面应变软化效应的边坡震后位移计算方法[J].计算力学学报,2024,41(6):1029~1036 |
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| 考虑滑面应变软化效应的边坡震后位移计算方法 |
| Seismic displacement calculation method of slope with considering strain-softening effect of slip surface |
| 投稿时间：2023-07-01 修订日期：2023-08-18 |
| DOI：10.7511/jslx20230701002 |
| 中文关键词: 边坡 应变软化 Newmark滑块位移法 震后位移 实时动态 |
| 英文关键词:slope strain softening Newmark sliding block displacement method seismic displacement real-time dynamic |
| 基金项目:自然科学基金面上项目(51374163)资助. |
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| 摘要点击次数: 46 |
| 全文下载次数: 30 |
| 中文摘要: |
| Newmark滑块位移法计算边坡震后位移,认为边坡屈服加速度为恒定值,未考虑滑面的应变软化效应与地震时程中滑动体条块几何参数实时动态变化的影响。针对均质土坡,以拟静力极限平衡理论为基础,采用对数螺旋线滑面假设,考虑滑面应变软化效应及在地震时程中滑动体实时下滑转角对条块几何参数的影响,推导了考虑应变软化效应的边坡动态屈服加速度及震后位移计算表达式,并通过编程实现了边坡震后位移计算。结合算例分析表明,随着边坡下滑转角的增大,边坡动态屈服加速度呈先增大后减小的趋势;考虑应变软化效应计算的边坡震后位移大小介于使用土体峰值强度指标和残余强度指标计算的震后位移之间;随着边坡稳定性的减小,考虑应变软化效应与不考虑应变软化效应的震后位移计算结果皆随之增大,且两者差距会逐步增大。 |
| 英文摘要: |
| The Newmark sliding block displacement method is used to calculate the seismic displacement of a slope,and the yield acceleration of a slope is considered to be a constant value,without considering the strain-softening effect of the slip surface and the influence of the real-time dynamic change of sliding slice geometric parameters during the seismic time history.For a homogeneous soil slope,based on the pseudo-static limit equilibrium theory,the calculated logarithmic spiral slip surface assumption,the strain-softening effect of the slip surface and the effect of real-time sliding angle on slice geometric parameters during the earthquake time history are considered,the formula for the dynamic yield acceleration and seismic displacement with considering the effect of strain-softening,and the calculation of slope seismic displacement is programmed.The results show that the slope dynamic yield acceleration firstly increases and then decreases as the steady growth of slope sliding angle.Considering the strain-softening effect,the calculated seismic displacement value of the slope is bigger than the calculated peak strength,but smaller than the calculated residual strength.With the decrease of the slope stability,the calculation results of the seismic displacement with and without strain softening effect both increuse,and the gap between them also increases. |
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