Abstract The paper demonstrates deterministic and reliability-based assessment of strength limit states (tensile resistance and pullout) and the service limit state for soil failure for mechanically stabilized earth (MSE) walls constructed with polyester (PET) strap reinforcement. The general approach considers the accuracy of the load and resistance models that appear in each limit state equation plus uncertainty in the estimate of nominal load and resistance values at time of design. Reliability index is computed using a closed-form solution that is easily implemented in a spreadsheet. Three PET strap MSE wall case studies are used to demonstrate the reliability-based assessment approach and to compare margins of safety using different load and resistance model combinations. In some walls using the Coherent Gravity Method to compute loads, the recommended nominal factors of safety for tensile strength and pullout limit states were not satisfied. However, reliability analyses showed that the walls satisfy recommended minimum target reliability index values for the limit states investigated, usually by large amounts. The most critical limit state is the soil failure limit state which is used in the Simplified Stiffness Method to keep the reinforced soil zone at working stress conditions assumed for geosynthetic MSE walls under operational conditions.

中文翻译：

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PET带加固土墙内部稳定性安全边际的确定性和概率评估

摘要 本文展示了对强度极限状态（抗拉强度和拉拔）和使用聚酯 (PET) 带增强材料建造的机械稳定土 (MSE) 墙的土壤破坏的使用极限状态的确定性和基于可靠性的评估。通用方法考虑了出现在每个极限状态方程中的负载和电阻模型的准确性，以及设计时额定负载和电阻值估计中的不确定性。使用可在电子表格中轻松实现的封闭式解决方案计算可靠性指数。三个 PET 带 MSE 墙案例研究用于演示基于可靠性的评估方法，并比较使用不同负载和阻力模型组合的安全裕度。在一些使用相干重力法计算载荷的墙中，不满足抗拉强度和拉拔极限状态的推荐标称安全系数。然而，可靠性分析表明，墙满足所研究的极限状态的推荐最小目标可靠性指标值，通常是大量的。最关键的极限状态是土体破坏极限状态，它在简化刚度方法中使用，以将加筋土区保持在为土工合成材料 MSE 墙在操作条件下假定的工作应力条件下。