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| 半填半挖道路路基边坡地震响应分析 |
| Seismic response analysis on semi-filled and semi-excavated roadbed slope |
| 投稿时间：2018-06-19 修订日期：2018-11-15 |
| DOI： |
| 中文关键词: 半挖半填路基 地震荷载 加数度响应 位移 |
| 英文关键词: semi-fill and semi-excavated roadbed earthquake loading acceleration response displacement |
| 基金项目:国家自然科学基金面上项目：51678571、51878667；湖南省自然科学基金面上项目：2018JJ2517；中建五局土木工程有限公司技术服务委托项目：020316A003097、020115003G019、020115003G018；深部岩土力学与地下工程国家重点实验室开放基金课题：SKLGDUEK1705 |
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| 中文摘要: |
| 依托某市政道路工程,基于道路实体工程断面模型,通过Flac3D构建半填半挖道路路基边坡数值模型,研究地震荷载作用下道路路基边坡的加速度、位移以及应力状态的变化规律,探讨半填半挖路基边坡的地震响应特征。研究表明,地震荷载作用下,路基边坡表面的加速度放大系数比路基边坡体内的大,垂直方向的运动比水平方向的运动更敏感强烈；地震荷载作用下边坡最大水平位移生在边坡中间位置而不是坡顶,路基边坡沉降随着模型高度增加而增加；地震荷载作用下边坡最大水平位移生在边坡中间位置而不是坡顶,路基边坡沉降随着模型高度增加而增加,当边坡超过一定高度时,其坡脚位置会有较大的隆起；地震荷载作用到下填土区域很大一部分处于拉伸破坏状态,并且其范围并不随着地震荷载作用的时间增加而产生改变,而模型底部只产生剪切破坏。 |
| 英文摘要: |
| Based on a municipal road project , the actual road model is simplified. The characteristics of the subgrade slope under the action of the earthquake load are studied by Flac3D . In this paper ,the acceleration , displacement and stress state of the roadbed slope under earthquake loading are analyzed .The characteristics of the filled soil and undisturbed soil under earthquake loading are discussed. The results of numerical simulation show that the acceleration amplification factor of subgrade slope surface is larger than that of subgrade slope under the action of earthquake load. The motion in the vertical direction is more sensitive than the horizontal motion. Under the earthquake loading, the maximum horizontal displacement of the slope occurs at the middle of the slope instead of the top of the slope. The settlement of the subgrade slope increases with the height of the model increases. When the slope exceeds a certain height, there will be a large uplift at the foot of the slope. A large region of the filled soil is in the state of tensile failure . The area in the state of tensile failure does not change with the increase of the time of motion after 10s of earthquake loading. The study show that the bottom of the model only produces shear failure. |
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