工程填土从物质组成和堆填方式可分为 :素填土、杂填土和冲填土 ;从填土的来源分为 :原土回填和外运填土 ;从填土的用途可分为 :填土地基、基础侧壁填土、房心填土和地坪填土等。用于工程的填土 ,其共同特点为 :工程填土都必须压实 ,达到要求的压实系数 ;工程填土要满足冻胀性 Engineering materials from the material composition and landfill can be divided into: plain fill, miscellaneous fill and fill fill; from the source of the fill is divided into: the original soil backfill and transport fill; can be divided from the use of fill For: fill the ground, the filling of the foundation sidewalls, the filling of the house core, and the filling of the floor. The common features of the earth filling used in the project are: the engineering filling must be compacted to achieve the required compaction factor; the engineering filling should meet the frost swellability