土方回填施工方案.doc

土方回填施工方案
一、工程简介
二、土方回填前的准备
1、回填料的确定
本工程回填料主要利用本工程开挖料，工程师认为不合格的填筑料一律不得使用。
2、标准击实试验
土方回填料确定后，项目部质检员、抽样员邀请监理工程师共同在回填料场进行取样，抽取的土样应具有代表性，各个土层和性状的土都应包括。土样抽取后送工地实验室做标准击实试验，确定最优含水率下的最大干密度。通过实验作出土方回填料的最优含水率为16.8%，最大干密度为1.71g/cm3。根据合同技术条款回填土压实度D≥90%的要求，确定出施工中控制的最小干密度为1.71g/cm3×90%=1.54g/cm3，再查“含水量与干密度曲线图”确定合格干密度下的含水率区间为11%-24%。
3、现场碾压试验
标准击实试验完成后，即在施工现场安排碾压试验，碾压试验的目的：（1）、核查土料压实后是否能够达到设计压实干密度值；（2）、核查压实机具的性能是否满足施工要求；（3）、选定合理的
Earth backfill construction plan
I. Brief Introduction of
Second, preparation before backfilling earthwork
1, back to fill the identified
The main advantage of this project the filler material of the excavation, filling materials engineer that failed will not be allowed to use.
2, the standard compaction test
Earth backfill is confirmed, the project department quality inspector, and the sampling staff supervision engineers invited back to fill in the field of joint sampling, extraction of soil samples should be representative of various soil and the soil characteristics should be included. Evacuation site soil samples collected standard laboratory compaction test to determine the optimum water content and the maximum dry density. Back to earth by experiment the optimum fill rate of 16.8% moisture content, maximum dry density 1.71g/cm3. Technical terms of the contract Backfill Compaction D ≥ 90% of the requirements identified in the control of construction minimum dry density 1.71g/cm3 × 90% = 1.54g/cm3, and then check "water content and dry density curve" determine eligibility under the moisture content dry density of 11% -24% range.
3, Field Compaction Test
Standard compaction test is completed at the construction site arrangement rolling test, rolling test purposes: (1), soil compaction verify whether the design can be compacted to dry density; (2), verification of compaction equipment performance meets the requirements of construction; (3), selected a reasonable