路基壓實施工方案.doc

路基壓實
路基壓實是保證路基質量的重要環節，路堤、路塹和路堤基底均應進行壓實。
   一、土質路基的壓實
    填土路堤壓實施工工序流程如下圖所示。

   1．鋪筑試驗路段確定路基壓實的最佳方案
    影響路基壓實的主要因素有土的力學性質和壓實功能、土的含水量、鋪層厚度、土的級配以及底層的強度和壓實度。路基碾壓時，并不是這些因素獨立起作用，而是這些因素共同起作用。因此高速公路進行路基施工時，應用不同的施工方案做試驗路段，從中選出路基壓實的最佳方案。
     鋪筑試驗段需制訂試驗方案，其目的是在給定壓路機的情況下，找出達到壓實標準的最經濟的鋪層厚度和碾壓次數。確切地說，就是尋求鋪層厚度與碾壓次數之比的極大值。試驗路段位置應選擇在地質條件、斷面形式均具有代表性的地段，路段長度不宜小于100cm。具體實施可以按以下步驟進行。
（1）取代表性土樣做重型擊實試驗，確定土的最佳含水量ω和最大干密度ρdmax，并繪制干密度與含水量的關系曲線。
（2）根據土的干密度與含水量關系曲線控制土的含水量ω。
（3）確定鋪層厚度和碾壓遍數。一般可根據壓路機械的功能及土質情況確定鋪層厚度，高速公路一般應按松鋪厚度30cm進行試驗，以確
Subgrade Compaction
Compaction is an important part of ensuring the quality of roadbed, embankments, cuttings and embankments should be compacted base.
   First, the compaction of soil subgrade
    Construction of embankment compaction process flow is shown below.

   1. Pavement test sections to determine the best solution Compaction
    The main factors influencing the subgrade compaction have compacted soil mechanical properties and functions, soil water content, layer thickness, soil gradation, and the underlying strength and compactness. Compacted subgrade, it does not separate these factors play a role, but these factors play a role. Therefore highway embankment construction for the application of different sections of the construction program to do testing, to choose the best solution Compaction.
     Pavement test section of the need to develop pilot programs aimed at roller in a given situation, find out achieved the most economical compaction standard overlay thickness and the number rolled. Rather, is to seek the number of overlay thickness and the ratio of rolling a great value. Test section location should be chosen in the geological conditions, the cross section have a representative form of lots, road length should not be less than 100cm. Specific implementation can perform the following steps.
(1) to take representative soil samples for heavy compaction test done to determine the optimum soil water content and maximum dry density ω ρdmax, and the mapping of the relationship between dry density and water content curve.
(2) According to the soil dry density and water content of soil water content curve control ω.
(3) determine the thickness of overlay and rolled several times. Generally be armed under the roller to determine the function and spread a layer of soil conditions, the general should be loose paved highways to test the thickness of 30cm, to ensure
 

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