| 加筋土边坡地震稳定性动点安全系数分析方法 |
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| 引用本文： | 董士杰,魏红卫.加筋土边坡地震稳定性动点安全系数分析方法[J].岩土力学,2014,35(Z2):543-547. |
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| 作者姓名： | 董士杰 魏红卫 |
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| 作者单位： | 中南大学 土木工程学院，长沙 410075 |
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| 基金项目： | 国家自然科学基金项目（No. 51178472，No. 50778181）。 |
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| 摘 要： | 对于地震作用下的土工合成材料加筋土边坡,边坡内部结构的动力响应十分复杂,按照已有的安全系数的方法评价比较困难。结合安全储备系数的原理,并考虑到水平方向和竖直方向地震荷载的共同作用,提出求解加筋土边坡地震稳定性的动点安全系数时程分析方法。在理论分析的基础上,分别定义加筋土边坡土体、土工合成材料和筋-土界面的动点安全系数,并建立数值模型。根据所定义的动点安全系数,在计算过程中使用开发的计算工具对动力响应过程中的动力特性数据进行记录、计算和存储,得到加筋土边坡数值模型在地震荷载作用下的动点安全系数。分析结果表明:动点安全系数时程分析方法具有良好的工程适用性;动点安全系数时程分析方法对复杂的加筋土边坡工程进行的地震稳定性分析考虑了加筋土边坡不同结构的综合稳定性,比现有的分析方法更明确地反应出加筋土边坡工程中相对薄弱的结构,对加筋土边坡工程的抗震设计提供一定参考价值;相比水平方向的地震,竖直方向的地震作用对加筋土边坡中筋材和筋-土界面的稳定性影响较大,但对加筋土边坡土体稳定性影响较小。
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| 关 键 词： | 加筋土边坡 地震稳定性 数值分析 动点安全系数 时程分析法 |
| 收稿时间： | 2014-06-05 |
Dynamic point safety factor analysis method of seismic stability of geosynthetics reinforced soil slope |
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| DONG Shi-jie,WEI Hong-wei.Dynamic point safety factor analysis method of seismic stability of geosynthetics reinforced soil slope[J].Rock and Soil Mechanics,2014,35(Z2):543-547. |
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| Authors: | DONG Shi-jie WEI Hong-wei |
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| Institution: | School of Civil Engineering, Central South University, Changsha 410075, China |
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| Abstract: | The time history analysis method of dynamic point safety factor is established based on safety margin, in light of the dynamic response of geosynthetics reinforced soil slope is very complicated, and existing methods are difficult to use for it. The nroposed method is used to evaluate the stability of geosynthetics reinforced soil slope, taking into account both horizontal and vertical seismic action. Based on the theoretical analysis, the dynamic point safety factors of the soil, geosynthetics and interface in the geosynthetics reinforced soil slope numerical model are defined. According to dynamic point safety factor method, through using a computational aids, the dynamic characteristics data is recorded, calculated and stored during computation process; and the dynamic point safety factor of the geosynthetics reinforced soil slope numerical model is figured out. The results show that the engineering applicability of method is well. The method reflects the relatively weak structure more clearly in the engineering, so as to provide reference in slope seismic design; vertical seismic action has greater influence on the stability of geosynthetics and interface, but smaller on soil. |
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| Keywords: | geosynthetics reinforced soil slope seismic stability numerical analysis dynamic point safety factor time history analysis method |
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