《岩土与环境工程》刊登“大量细骨料回填的部分加筋挡土墙的地震响应”

作者：Hoe I. Ling，Dov Leshchinsky，Yoshiyuki Mohri，Jui-Pin Wang

刊物：岩土与环境工程  138卷第8期  934-944页

关键词：加筋挡土墙；地震响应；地震；土工织物；低质量回填；粉质粘土；模块

摘要：本文介绍了三个土工织物部分加筋挡土墙系统的地震反应特征。这三个挡土墙使用淤泥和沙的混合物回填，并使用了由神户地震荷载引起的颤抖的椅子。描述了回填混合物的特性和准备过程，测试墙体的结构，钢筋布置和仪表的性能和被观察墙的表现。观察与测试结果表明：在相同的条件下，用0.4m钢筋竖直间隔的墙和用大比例的细骨料回填的墙比用高质量沙粒土墙抗震效果好。在连续的神户地震荷载的作用下，将使用0.8m竖直间隔墙的连锁面砌块移除后，不会导致总体的坍塌。只有当顶端的面砌块快倾倒时，才会观察到墙顶端成层砌块后局部的剪切现象。抗震性能好的原因主要是土混合物中的真粘聚力和表观粘聚力起作用。由于表观粘聚力受水含量的影响，因此可以通过提供合适的排水方式来预防水渗透进回填层来控制水的含量。由于表观粘聚力与含水相关具有一定的风险，因此不建议考虑其对基质吸力的贡献。

Earthquake Response of Reinforced Segmental Retaining Walls Backfilled with Substantial Percentage of Fines

Author: Hoe I. Ling; Dov Leshchinsky; Yoshiyuki Mohri; and Jui-Pin Wang

Journal: Journal of Geotechnical and Geoenvironmental Engineering,Volume 138，Number 8, 934-944

Key words: Reinforced soil retaining wall, seismic response, Earthquake, Geo-synthetics, low-quality backfill, silty clay, modular block

Abstract: This paper reports on the seismic performance of three geo-synthetic-reinforced segmental retaining wall systems backfilled with a silty sand mixture, using a shaking table excited by 1995 Kobe earthquake loadings. The preparation of the backfill mixture and its properties, the tested wall configurations, the reinforcement layouts and instrumentations, and the observed wall performance are described. Visual observations and test results indicate that walls having 0.4-m vertical reinforcement spacing, backfilled with soil containing a large percentage of fines, performed better than those having good-quality sandy soil under otherwise identical conditions. Vertical spacing of 0.8 m with removal of interlocking facing blocks in one of the walls did not lead to global collapse under repeated applications of the Kobe earthquake loadings. Only localized shear failure behind the top block layer was observed as the top facing blocks tended to topple. The good performance was attributable to apparent cohesion in the soil mixture stemming from soil matrix suction and true cohesion. Because this apparent cohesion is affected by the moisture content, its existence must be ensured by providing proper drainage to prevent seepage into the backfill. Considering the risk associated with the use of apparent cohesion, its exclusion from design is recommended.

原文链接：http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000669