Compaction Quality Control of Coarse-grained Soils Using Dynamic Penetration Test Results through Correlation with Relative Compaction Percentages

Abstract

In this study, in order to control the compaction quality of the coarse-grained soils used in sub-base and base layers of several road construction projects, the dynamic penetration test (DPT) has been conducted on 50 locations using both dynamic penetrometer of light (DPL) and dynamic penetrometer of medium (DPM). First, in order to obtain the results independently from the penetrometer type, the dynamic cone resistance (qd) values were calculated in each location based on hammer blows of both DPL and DPM. Next, the average values of qd obtained by both the penetrometers, were correlated with the percentages of relative compaction (RC) in the same location obtained by performing the sand cone test on location and modified proctor test in laboratory. Accordingly, it was extracted a power correlation between the qd values and RC percentages, with the determination coefficient (R 2 ) of about 0.64. Then, for considering the effect of soil grains size using the median particle size (D50), a more accurate power correlation was obtained which as a result, the R 2 value enhanced to 0.89. Furthermore, in order to consider the soil vertical stresses caused by depth of testing as well as obtaining a normalized relationship, the qd values were divided by the vertical stresses and correlated with the RC percentages. Afterwards, regarding the effect of soils grains size and also their gradation properties, this time by using the dimensionless coefficients of uniformity (Cu) and curvature (Cc), it was extracted an other normalized power correlation. The results showed that the R 2 value enhanced from about 0.49 to 0.92.

Research and Laboratory Methods for Determining Coarse Soils at the Experimental Site During the Construction of an Earth Dam

“…Based on the study and analysis of numerous experiments and dependencies, we have developed a method for composing model mixtures that characterizes the composition and condition of the soils under consideration more objectively (Ghorashi et al, 2023).…”

Development of Light Dynamic Penetrometer for Application in Dense Soil

“…The dynamic penetration index (DPI), which is measured as the number of millimetres per impact (mm/blow), also can be used. In general, an increase in the strength or hardness of the soil will cause the DPI to decrease [1,2]. Various techniques can be used for soil improvement in road embankment and geotechnical engineering [3].…”

Hemzemin Geçit Yol Alt Dolgusu Sıkışma Verimi Tayini Kozlu Örneği

“…Ghorashi vd. (2023) [5] tarafından gerçekleştirilen çalışmada, kaba daneli zeminlerin sıkışma kalitesi kontrolünde dinamik kompaksiyon ve kum konisi deneyleri arasındaki korelasyon incelenmiş ve Cu, Cc ve D50 değerlerinin, üretilen korelasyonların isabetli olmasında önemli rol oynadığı belirtilmiştir. Bu çalışmada, 4 farklı noktada arazi şartlarında gerçekleştirilen kum konisi ve laboratuvar koşulunda yapılan diğer deneylere göre, yol alt dolgusu olarak kullanılacak olan malzemenin performansı değerlendirilmiştir.…”