加筋土挡墙背后填料压实及质量检测方法研究  

Study on Compaction and Quality Detection Method of Back Filling of Reinforced Earth Retaining Wall

作　　者：郭绍影 Guo Shaoying(China Railway Fifth Survey and Design Institute Group Co. Ltd., Beijing 102600, China)

机构地区：[1]中铁第五勘察设计院集团有限公司

出　　处：《铁道建筑技术》2019年第7期1-4,79,共5页Railway Construction Technology

基　　金：原中国铁路总公司科技研究开发计划项目(2016G006-D)

摘　　要：加筋土挡墙背后2m范围内不宜采用大型压实机械进行压实,只能采用平板振动夯和小型压路机进行压实,压实时的虚铺厚度应根据压实机具的质量确定。对于平板振动夯,虚铺厚度不宜大于15cm,压实8遍时可满足压实貭量要求。对于小型压路机,工作质量大于1.5 t时,虚铺厚度不应大于20cm;工作质量小于1.5 t时,虚铺厚度不宜大于15cm,且均需碾压10遍。可用动态变形模量Evd代替地基系数K30作为挡墙背后填料压实质量的力学控制指标,此时应满足动态变形模量Evd>35MPa。It is not suitable to use large compacting machinery to compact the reinforced earth retaining wall within 2 m of its back, but it is only compacted by flat vibration rammer and small compactor. The pressuring virtual height should be determined according to the weight of the compaction machinery. For flat vibration rammer, the virtual height should not be thicker than 15 cm, and the requirements of compaction quality can be achieved with eight times of compaction. For small roller, when the weight of work is more than 1.5 t, the virtual height should not be thicker than 20 cm, on the contrary, the virtual height should not be thicker than 15 cm, and all of them need to be crushed 10 times. The dynamic deformation modulus Evd can be used to replace the foundation coefficient K30 as the mechanical control index of the packing compaction quality behind the retaining wall. At this time, the dynamic deformation modulus Evd >35 MPa should be satisfied.

关 键 词：加筋土挡土墙 背后填料 小型压实机具 压实遍数 检测方法 试验 

分 类 号：TU476.4[建筑科学—结构工程] U213.1[建筑科学—土工工程]