软土地基上循环荷载作用下加筋碎石垫层工作特性分析.PDF

第31 卷第 1 期 湖　南　工　业　大　学　学　报 Vol.31 No.1 2017 年1 月 Journal of Hunan University of Technology Jan. 2017 doi:10.3969/j .issn.1673-9833.2017.01.006 软土地基上循环荷载作用下加筋碎石垫层 工作特性分析 何　杰，高建喜，孟森松，王　忍 （湖南工业大学 土木工程学院，湖南 株洲 4 12007 ） 摘　要：通过模型试验研究了循环荷载作用下土工格栅、土工格室及纯碎石垫层在软土地基上的承载特 性；分析不同工况下沉降、桩身应变及桩土应力比随循环次数、峰值荷载的变化规律。研究结果表明：在动 载条件下，加筋碎石垫层能有效地限制垫层的位移，显著减小复合地基的累计沉降；加筋后的碎石垫层强度 - - 和刚度均得到增强，能有效调节桩 土应力分布，改善碎石垫层的受力特性，大幅度提高桩 土应力比，有 - 效减小桩身应变；同等条件下，土工格室碎石垫层对于减小桩顶沉降、提高桩 土应力比和降低桩身应变的 性能略优于土工格栅碎石垫层，并随着循环峰值荷载增加，两者的作用效果更好。 - 关键词：软土地基；土工格栅；土工格室；桩 土应力比；循环荷载 中图分类号：TU44 1　　　　文献标志码：A　　　　文章编号：1673-9833(20 17)0 1-0035-06 Analysis of the Operation Performance of Reinforced Grave Cushion Under Cyclic Loading on Soft Soil Foundations HE Jie ，GAO Jianxi ，MENG Sensong ，WANG Ren （School of Civil Engineering ，Hunan University of Technology ，Zhuzhou Hunan 4 12007 ，China ） Abstract ：Based on a model testing, a research has been conducted on the load-bearing characteristics of geogrids, geocells and pure gravel cushion on the soft soil foundation under cyclic loading. An analysis has been made of the change regulation of the settlement, the strain of pile and the stress ratio of pile and soil along with cycle times and peak load under different working conditions. The research results show that under the condition of a dynamic loading, the reinforced gravel cushion can effectively limit the displacement of the cushion, and significantly reduce the cumulative settlement of the co