土方回填施工方案.doc

土方回填施工方案
一、工程簡介
二、土方回填前的準備
1、回填料的確定
本工程回填料主要利用本工程開挖料，工程師認為不合格的填筑料一律不得使用。
2、標準擊實試驗
土方回填料確定后，項目部質檢員、抽樣員邀請監理工程師共同在回填料場進行取樣，抽取的土樣應具有代表性，各個土層和性狀的土都應包括。土樣抽取后送工地實驗室做標準擊實試驗，確定最優含水率下的最大干密度。通過實驗作出土方回填料的最優含水率為16.8%，最大干密度為1.71g/cm3。根據合同技術條款回填土壓實度D≥90%的要求，確定出施工中控制的最小干密度為1.71g/cm3×90%=1.54g/cm3，再查“含水量與干密度曲線圖”確定合格干密度下的含水率區間為11%-24%。
3、現場碾壓試驗
標準擊實試驗完成后，即在施工現場安排碾壓試驗，碾壓試驗的目的：（1）、核查土料壓實后是否能夠達到設計壓實干密度值；（2）、核查壓實機具的性能是否滿足施工要求；（3）、選定合理的
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
 

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