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Modeling of the compaction-induced stress on reinforced soil walls

机译:加筋土墙上压实引起的应力建模

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A new simple analytical procedure (AASHTO modified) that includes the effect of the induced stress due to backfill compaction for use with conventional design methods of geosynthetic reinforced soil (GRS) walls is proposed. The proposed analytical procedure may be used with any conventional design methods that do not take into consideration the effect of the compaction-induced stress in their calculations. This approach is based on an equation suggested by Wu and Pham (2010) to calculate the increase in lateral stress in a reinforced soil mass due to compaction. Additionally, two numerical procedures for modeling of compaction are described. Analyses using these procedures were performed to evaluate the capability of the proposed analytical procedure. The results were compared with values predicted using the Ehrlich and Mitchell (1994) method, the modified version of the K-stiffness method (Bathurst et al., 2008) and the AASHTO simplified method. The results show that the AASHTO modified method and the numerical analyses, in which the compaction-induced stress was modeled using two distributed loads at the top and bottom of each soil layer, resulted in values of the maximum reinforcement tension, T_(max). that agree with those from the full-scale test and those calculated by Ehrlich and Mitchell (1994). On the other hand, the K-stiffness method under-predicts the measured T_(max) values. Moreover, numerical modeling of compaction using a distribution load only at the top of each soil layer overestimated the measurements.
机译:提出了一种新的简单分析程序(经AASHTO修改),该程序包括回填压实引起的诱导应力的影响,可与土工合成加筋土(GRS)墙的常规设计方法一起使用。建议的分析程序可以与任何常规设计方法一起使用,这些方法在计算中不考虑压实引起的应力的影响。该方法基于Wu和Pham(2010)提出的方程,用于计算由于压实而导致的加筋土体中侧向应力的增加。另外,描述了用于压实建模的两个数值程序。使用这些程序进行了分析,以评估所提出分析程序的能力。将结果与使用Ehrlich和Mitchell(1994)方法,K刚度方法的改进版本(Bathurst等人,2008)和AASHTO简化方法预测的值进行比较。结果表明,使用AASHTO改进方法和数值分析,其中在每个土层的顶部和底部使用两个分布载荷对压实引起的应力进行建模,得出最大增强张力值T_(max)。与全面测试的结果以及Ehrlich和Mitchell(1994)计算的结果一致。另一方面,K刚度方法预测的T_(max)值预测不足。此外,仅在每个土壤层的顶部使用分布载荷进行压实的数值模型高估了测量值。

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