Friction Correction Equation for the Dynamic Cone Penetrometer in Subsoil Strength Testing

2000 ◽  
Vol 1714 (1) ◽  
pp. 89-97 ◽  
Author(s):  
Moshe Livneh
Keyword(s):  
Skin Friction ◽  
Testing Procedure ◽  
Strength Testing ◽  
Cone Penetrometer ◽  
Extensive Experience ◽  
Testing Apparatus ◽  
Dynamic Cone Penetrometer ◽  
Torque Moment ◽  
Penetration Depths

Extensive experience gained with the dynamic cone penetrometer (DCP) in Israel has led to some modifications in both the testing apparatus and the testing procedure. One such modification is introduction of a theoretical corrective equation when the penetration is not performed vertically in order to isolate the skin friction that develops along the penetrating rod, which significantly affects DCP values. For this purpose, the torque moment is measured at various penetration depths by the same technique applied for the well-known Vane test. This corrective equation is then modified in light of the results obtained for validating in situ DCP tests.

Assessment of in Situ Structural Properties of Lime-Stabilized Clay Subgrades

1996 ◽  
Vol 1546 (1) ◽  
pp. 13-23 ◽  
Author(s):  
Dallas N. Little
Keyword(s):  
Structural Properties ◽  
Previous Literature ◽  
Cone Penetrometer ◽  
Department Of Transportation ◽  
Lime Stabilization ◽  
Dynamic Cone Penetrometer ◽  
Texas Department ◽  
Aggregate Base ◽  
Falling Weight

Lime-stabilized clay subgrades are used almost routinely in Texas to facilitate construction and to provide a foundation for aggregate base courses and hot mix surfaces. Research sponsored by the Texas Department of Transportation demonstrates that the in situ moduli and strength improvements afforded by lime stabilization of these layers are often significant and deserve structural consideration. A study of the range of modulus values determined from falling weight deflec-tometer deflection data and supported by in situ dynamic cone penetrometer data for 40 pavement subgrades indicates that the lime-stabilized subgrades provide a level of stiffness and strength that is similar to that of an unbounded aggregate base. This substantiates previous literature suggesting that properly designed and constructed lime-stabilized subgrades should be assigned AASHTO structural coefficients in the same range as unbound aggregate bases, that is, between 0.10 and 0.14.

scholarly journals Assessment Of Designed And Measured Mechanistic Parameters Of Concrete Pavement Foundation

2019 ◽  
Vol 14 (1) ◽  
pp. 37-57
Author(s):  
Yang Zhang ◽  
Pavana Vennapusa ◽  
David Joshua White
Keyword(s):  
California Bearing Ratio ◽  
Cone Penetrometer ◽  
Falling Weight Deflectometer ◽  
In Situ Tests ◽  
Target Value ◽  
Dynamic Cone Penetrometer ◽  
Support Conditions ◽  
Falling Weight ◽  
Pavement Foundation

There are plenty of in situ tests available to examine pavement foundation performance regarding stiffness and support conditions. This study evaluates several in situ tests of the stiffness and support conditions of concrete pavement foundation layers. The principal objective of this study was to evaluate the outputs from Dynamic Cone Penetrometer tests and Falling Weight Deflectometer tests. The California Bearing Ratio from Dynamic Cone Penetrometer tests and the deflection data from Falling Weight Deflectometer tests were correlated to the design parameter – modulus of subgrade reaction k through correlations employed in pavement design manuals. Three methods for obtaining the k values were conducted, with the intent to evaluate which method provides the results most similar to the target value and whether the studied correlations are reliable. The back-calculated k values from Falling Weight Deflectometer deflections and the weak layer California Bearing Ratio correlated k values based on the Portland Cement Association method were close to the target value, while the California Bearing Ratio empirically correlated k based on the American Association of State Highway and Transportation Officials method presented values significantly higher than the target value. Those previously reported correlations were likely to overestimate the k values based on subgrade California Bearing Ratio values.

The Use of the Dynamic Cone Penetrometer for Quality Control of Compaction Operations

2013 ◽  
Vol 10 ◽  
pp. 49-64
Author(s):  
Moshe Livneh ◽  
Noam A. Livneh
Keyword(s):  
Quality Control ◽  
Silty Sand ◽  
Granular Soils ◽  
Cone Penetrometer ◽  
Clayey Soils ◽  
Falling Weight Deflectometer ◽  
Dynamic Cone Penetrometer ◽  
Additional Testing ◽  
Falling Weight

The use of a new quality control (QC) and quality assurance (QA) specification involving Dynamic Cone Penetrometer (DCP) testing in concert with conventional moisture and density testing is becoming more and more frequent in various parts of the world. The need for this additional testing is essential, as the regular in-situ density tests cannot alone ensure the compliance of the layers constructed with the compaction requirements. Recent analyses of the correlation between the DCP testing and the California Bearing Ratio CBR testing show that QC and QA DCP testing is adequate to verify compaction, stability and vertical uniformity in both cohesive and granular soils. Two examples of DCP usage in two Israeli earthwork projects, one of clayey soils and the other of silty-sand soils, indicate the benefits of this usage along with, though for the clayey example only, Falling Weight Deflectometer (FWD) testing.

scholarly journals Studi Literatur Korelasi Hasil Uji Berdasarkan Uji Plate Bearing dan Uji Dynamic Cone Penetrometer

2020 ◽  
Vol 3 (4) ◽  
pp. 1157
Author(s):  
Steven Lius ◽  
Inda Sumarli ◽  
Ali Iskandar
Keyword(s):  
Soil Samples ◽  
Cone Penetrometer ◽  
Clayey Soils ◽  
In Situ Test ◽  
Subgrade Soils ◽  
Testing Method ◽  
Dynamic Cone Penetrometer ◽  
Subgrade Soil

The subgrade soils must be able to withstand the load that is transferred. The quality of the subgrade soil is important because if it is sturdy, the construction above it can also be sturdy as well. Therefore, in designing a construction, soil investigation, such as plate bearing test and dynamic cone penetrometer test, must be conducted. However, one method may be superior compared to others, that the author will analyze the correlation between them. Plate bearing test is an in-situ test used for determining the ultimate bearing capacity of soil by only applying pressure to it. Whereas, dynamic cone penetrometer test is a testing method to measure the thickness and strength of soil. In this research, the collected data will be analyzed and correlated. The result of correlation between ks and CBR from DCP test is the determinant coefficient value. The value for clayey soils is 0.6198 which means that the correlation value is strong. Meanwhile, for sandy soils, the values are 0.9841 and 0.9878 which means both of the correlation values are very strong. Furthermore, the correlation of Su values from both tests cannot be determined because the soil samples have not reached the fracture condition. Lapisan subgrade merupakan lapisan yang menahan seluruh beban di atasnya. Kualitas dari lapisan ini sangat penting, karena jika lapisan subgrade tersebut kokoh, maka konstruksi di atasnya juga akan kokoh. Oleh karena itu, dalam merencanakan sebuah konstruksi, penyelidikan tanah, seperti uji plate bearing dan uji dynamic cone penetrometer, di lokasi suatu bangunan yang akan dibangun itu sangat penting. Namun, setiap metode penyelidikan tanah tentunya memiliki kelebihan dan kekurangan masing-masing, sehingga penulis akan menganalisa korelasi antara kedua pengujian. Uji plate bearing merupakan metode pengujian untuk menentukan nilai daya dukung tanah dengan hanya memberikan tekanan pada tanah. Sedangkan, uji dynamic cone penetrometer merupakan metode pengujian untuk mengetahui nilai ketebalan dan kekuatan suatu lapisan tanah. Pada penelitian ini, data yang sudah dikumpulkan akan dianalisa dan dikorelasikan. Hasil korelasi antara nilai modulus reaksi tanah dasar dan CBR dari uji DCP untuk jenis tanah lempung menghasilkan koefisien determinan sebesar 0.6198 yang artinya nilai korelasi tersebut kuat. Sedangkan, untuk jenis tanah pasir, didapatkan koefisien determinan sebesar 0.9841 dan 0.9878 yang artinya nilai korelasi tersebut sangat kuat. Kemudian, untuk korelasi nilai kuat geser tanah dari masing-masing pengujian belum bisa dijelaskan karena sampel tanah yang digunakan belum mencapai kondisi fracture.

scholarly journals Development of Correlation between Soaked CBR and In-Situ CBR Determined by DCP for Soil in the Southern Province of Rwanda

2020 ◽  
Vol 8 (01) ◽  
pp. 314-318
Author(s):  
Naphtal NTIRENGANYA ◽  
Babiker Basher ◽  
Elsir Suliman Ahmed ◽  
Dr. Mohammed Shallal
Keyword(s):  
Sieve Analysis ◽  
Cone Penetrometer ◽  
Southern Province ◽  
Dynamic Cone Penetrometer

In this paper, using Dynamic Cone Penetrometer (DCP), in-situ CBR tests have been carried out on 31 locations in Nyamgabe District in the Southern Province of Rwanda. The in-situ CBR results have been obtained from these tests. Thirty One tests pits were dug in the same locations and samples taken to the laboratory. Sieve Analysis, Atterburg Limits, Proctor and CBR tests were conducted on these samples. Accordingly a correlation has been developed between the In-Situ CBR using the DCP and the laboratory soaked CBR. The developed correlation helps to estimate the laboratory soaked CBR from the in-situ CBR using the DCP

scholarly journals Pelatihan Pengujian In-Situ Tanah bagi laboran Muda Mekanika Tanah

2021 ◽  
Vol 5 (6) ◽  
pp. 1559-1565
Author(s):  
Susy Srihandayani ◽  
Fitridawati Soehardi ◽  
Lusi Dwi Putri ◽  
Winayati Winayati
Keyword(s):  
Cone Penetrometer ◽  
In Situ Test ◽  
Dynamic Cone Penetrometer

In-situ test adalah salah satu metode pengujian geomekanika yang pelaksanaannya dilakukan langsung di lapangan, tanpa pengambilan percontoh untuk laboratorium. Rendahnya minat laboran dalam mendalami bidang mekanika tanah khususnya pengujian tanah baik di lapangan maupun di laboratorium. Hal ini di sebabkan oleh para laboran menganggab bahwa pengembangan keahlian dalam menggunakan peralatan pengujian dan pengolahan data mekanika tanah cukup sulit dan mahal. HIMATESI merupakan sebuah himpunan mahasiswa yang beranggotakan para peneliti muda, laboran muda atau mahasiswa tingkat akhir yang sedang melakukan penelitian dan pengujian mekanika tanah. Mitra menyadari perlu peningkatan pemahaman tentang pengujian In-Situ tanah. Namun disisi lain menjadi ketakutan tersendiri bagi mitra tentang penyelsaiaan permasalahan yang timbul dalam pengujian In-Situ tanah pada saat pelaksanaan dilapangan. Perguruan tinggi menjawab persoalan mitra dengan memberikan pengetahuan tentang pengujian In-Situ tanah dan pelatihan penggunaan peralatan pengujian In-Situ tanah serta trik-trik menhadapi permasalahan dalam pengujian In-Situ tanah pengujian In-Situ tanah secara gratis. Kegiatan Pengabdian masyarakat dalam bentuk pelatihan pengujian In-Situ Tanah bagi laboran mekanika tanah  yang diadakan bertujuan untuk memberikan bekal informasi tentang tentang pengenalan dan penggunaan alat pengujian In-Situ seperti Dynamic Cone Penetrometer, alat Handbore dan alat Sandcone. Hasil pelatihan ini mampu meningkatkan pengetahuan peserta terhadap penggunaan alat pengujian In-situ tanah dan trik-trik dalam mengatasi permasalahan dilapangan terhadap penggunaan alat Insitu sehingga diharapkan para peserta dapat mengimplementasikan ilmu yang di dapat dalam pelaksanaan dilapangan nantinya.

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