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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。
For geosynthetic reinforced earth slopes under earthquake, the dynamic response of the internal structure of the slope is very complicated, and it is difficult to evaluate according to the existing safety factor method. Combined with the principle of safety reserve coefficient, considering the joint action of seismic loads in horizontal direction and vertical direction, a time-history analysis method of moving-point safety factor is proposed to solve the seismic stability of reinforced soil slope. On the basis of theoretical analysis, the safety factor of moving point of reinforced earth slope soil, geosynthetics and tendon-soil interface are respectively defined, and the numerical model is established. According to the defined safety factor of moving point, the dynamic characteristic data during dynamic response is recorded, calculated and stored by using the developed calculation tool in the calculation process, and the moving point of the reinforced earth slope numerical model under the earthquake load is obtained. Safety factor. The analysis results show that the method of time-history analysis of the safety factor of moving point has a good engineering applicability. The analysis of seismic stability of complex reinforced earth slope with moving-point safety factor time-history method takes into account the difference of the reinforced soil slope The comprehensive stability of the structure reflects the relatively weak structure of the reinforced earth slope more clearly than the existing analysis methods and provides certain reference value for the seismic design of the reinforced earth slope. Compared with the horizontal earthquake The vertical seismic action has a great influence on the stability of the reinforcement and reinforcement-soil interface, but has little effect on the stability of the reinforced soil slope.