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Experimental verification of current seismic analysis methods of reinforced soil walls

机译：目前加筋土墙地震分析方法的实验验证

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The paper investigates the accuracy of two limit equilibrium design approaches used for seismic stability analyses of reinforced soil walls. Responses from a series of reinforced soil wall models, tested on shaking table, are compared to similar responses predicted using both NCMA, and AASHTO/FHWA design guidelines. First, orientation of the soil slip surface measured during subsequent base shaking was compared to the values predicted analytically. Comparison results suggested that the current design methods tend to under predict the size of the soil failure wedge at different input base acceleration amplitudes. Therefore, the current equation proposed to predict the angle of soil slip surface is modified to match measured values. Second, the horizontal and vertical seismic coefficients used in the current seismic analysis methods are compared to values inferred from shaking table accelerometer responses. Results indicated that equations suggested to calculate horizontal acceleration coefficient for design of reinforced soil walls are non-conservative for input base acceleration larger than 0.3 g. Finally, dynamic earth force magnitudes and locations, and dynamic reinforcement force increments measured from shaking table model tests are used to identify sources of conservatism and non-conservatism of the current design methodologies. Different modifications have been suggested to reduce conservativeness or increase the safety of the design guidelines.
机译：本文研究了用于加筋土墙抗震稳定性分析的两种极限平衡设计方法的准确性。将一系列在振动台上测试过的加筋土墙模型的响应与使用NCMA和AASHTO / FHWA设计指南预测的相似响应进行比较。首先，将在随后的基础振动过程中测得的土壤滑移面的方向与分析预测的值进行比较。比较结果表明，当前的设计方法往往会在不同的输入基础加速度幅度下对土体破坏楔的大小进行预测。因此，修改了用于预测滑坡面角度的当前方程，以匹配测量值。其次，将当前地震分析方法中使用的水平和垂直地震系数与从振动台加速度计响应推断出的值进行比较。结果表明，建议的计算加筋土墙设计水平加速度系数的公式对于输入基础加速度大于0.3μg而言是非保守的。最后，通过振动台模型测试测得的动态土力大小和位置以及动态增强力增量用于确定当前设计方法的保守性和非保守性来源。已经提出了不同的修改方案，以减少保守性或提高设计准则的安全性。

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