机械回填土工艺标准
1 范  围
本工艺标准适用于工业及民用建筑物、构筑物大面积平整场地、大型基坑和
管沟等回填土。
2 施工准备
2．1  材料及主要机具：
2．1．1  碎石类土、砂土（使用细砂、粉砂时应取得设计单位同意）和baopo石碴，可用作表层以下填料。其最大粒径不得超过每层铺填厚度的2/3或3/4（使用振动碾时），含水率应符合规定。
2．1．2  粘性土应检查其含水率，必须达到设计控制范
Mechanical back fill process standards
1 Scope
This technology is applicable to industrial and civil buildings, structures large flat space, large pit and
Pipe trench backfill.
2 construction preparation
2.1 Materials and main equipment:
2.1.1 gravel type of soil, sand (with fine sand and silt units should be designed to obtain consent) and blasting stone ballast, the following can be used as filler surface. The maximum size shall not exceed the thickness of each layer filling of 2 / 3 or 3 / 4 (when using the vibrating roller), moisture content should be specified.
2.1.2 Cohesive should check their water content, must meet the design control Fan