砂砾石垫层的施工工艺试验研究  

Experimental research on construction technology of sand-gravel cushion

作　　者：刘志伟[1] 张希宏[1] 

机构地区：[1]西北电力设计院,西安710032

出　　处：《工程勘察》2011年第6期28-31,共4页Geotechnical Investigation & Surveying

摘　　要：砂砾石垫层换填地基可以提供较高的地基承载力,有效地控制建筑物变形。施工工艺包括材料选择,最大干密度确定,单层虚铺厚度及碾压遍数,施工质量控制等。试验研究表明,砂砾石料选择应达到级配合理,细粒含量(<5mm颗粒含量)控制在25%～35%,单层虚铺厚度一般在40～60cm,含水量控制在3%～6%之间,振动碾压6～8遍后,压实系数均可达到0.97以上,可获得较高的地基承载力与较好的工程效益。Sand-gravel cushion may provide high bearing capacity and control the settlement and deformation of structure effectively.The construction technologies include material selection,determination of the maximum dry density,loose thickness of single-layer paving and times of rolling compaction,construction quantity control etc.Experimental research indicates that the proper sand-gravel material selection and reasonable grain grading,the content of granule（grain size less than 5mm） between 25% and 35%,the loose thickness of single-layer paving between 40cm and 60cm,the water content between 3% and 6%,after 6 to 8 times of rolling compaction,the compaction degree may reach 0.97 or more and obtain high bearing capacity and good engineering benefits.

关 键 词：砂砾石垫层 碾压 施工工艺 密实度 

分 类 号：TU41[建筑科学—岩土工程]