利用動態圓錐貫入試驗法快速檢測土壤工地密度

Using the Dynamic Penetration Test Technique for Rapid Evaluation of Soil Field Density

黃子哲(Tzu-che Huang)

指導教授 ： 賴俊仁

朝陽科技大學/理工學院/營建工程系/碩士(2010年)

摘要

目前工地密度檢驗大多採用砂錐法，雖然此法有極佳的準確性及可靠性， 但其檢驗程序步驟繁瑣，無法達到較為全面品檢之目的，實為土方填築品質管理極需改善之處。本研究針對利用ASTM- D7380貫入錐作為快速有效檢測土壤工地密度可行性進行探討，研究重點包含，土壤種類、含水量等變數對貫入錐靈敏度之分析及應用此法於檢測工地密度的可行性驗證。本研究在實驗室內建立包含現行河海堤工程、湖山水庫壩體防滲心層料以及外層殼層料等三種材料之率定曲線後，配合土壤取樣來源處之現行河海堤工程及湖山水庫大壩工程之施工，進行貫入試驗檢測土壤輾壓夯實後之貫入阻力以推估其工地密度。
研究結果顯示：對於凝聚性材料如湖山水庫1a心層料利用ASTM D-7380動態圓錐貫入試驗檢測現地土壤工地密度是可行的，但應用於非凝聚性土壤如湖山水庫殼層料則需考慮含水量的影響，至於白水溪河堤料由於其料源取得與夯實含水量控制不佳，導致於施做出來的結果比較不盡理想。

關鍵字

ASTM-D7380動態圓錐貫入試驗 ； 工地密度

並列摘要

For the quality control of earth works, sand cone tests were usually performed to obtain the dry density of backfilled materials, Although this method has excellent accuracy and reliability, but the tedious procedures of performing this test prevent it from more comprehensive quality inspection purposes. In this study, the ASTM-D7380 dynamic penetration cone was used to explore the feasibility of rapid evaluation of field density. Factors such as moisture content, soil type moisture and other variables on the sensitivity of penetration resistant were investigated. This study established the laboratory calibration curves of backfill materials for the embankments of the White water River and the Hushan reservoir. These calibration curves were then used to evaluate the campaction quality of field works.

Results of this study indicate that the ASTM D-7380 dynamic cone can successfully evaluate the density of cohesive soils such as the core material of the Hushan Reservior. However, for noncohesive soils such as the shell material the effects of compaction moisture content should be considered . For the Whitewater River embankment material, because of the lack of good quality control, the results is not as good as the other two materials.

並列關鍵字

the site density ； ASTM-D7380 dynamic cone penetration test

參考文獻

2.ASTM (2007), “Standard Test Methods for Laboratory Compaction Characteristics of Soil Using Standard Effort,” Annual Book of ASTM Standards, D-698-07e1, Vol. 04.08, West Conshohocken, PA.

4.ASTM (2007), “Standard Test Method for Density and Unit Weight of Soil in Place by the Sand-Cone Method,” Annual Book of ASTM Standards, D-1556-07, Vol. 04.08, West Conshohocken, PA.

5.ASTM (2008), “Standard Test Method for Density and Unit Weight of Soil in Place by the Rubber Balloon Method,” Annual Book of ASTM Standards, D-2167-08, Vol. 04.08, West Conshohocken, PA.

6.ASTM (2008), “Standard Test Methods for Density of Soil and Soil-Aggregate in Place by Nuclear Methods,” Annual Book of ASTM Standards, D-6938-08a, Vol. 04.08, West Conshohocken, PA.

8.Topp, G.C., Davis, J.L., and Annan, A.P. (1980), “Electromagnetic Determination of Soil Water Content: Measurements in Coaxial Transmission Lines,” Water Resource Reservation, Vol. 6, No. 3, p. 574-582.