scholarly journals Comparative Study on Estimation Methods of Dynamic Resistance Using Dynamic Cone Penetrometer

Sensors ◽  
2021 ◽  
Vol 21 (9) ◽  
pp. 3085
Author(s):  
Sang Yeob Kim ◽  
Jong-Sub Lee ◽  
Dong-Ju Kim ◽  
Yong-Hoon Byun
Keyword(s):  
Integration Method ◽  
Dynamic Responses ◽  
Estimation Methods ◽  
Dynamic Resistance ◽  
Cone Penetrometer ◽  
Cone Penetration ◽  
Dynamic Cone Penetrometer ◽  
Time Period ◽  
Dynamic Cone Penetration Test ◽  
Dynamic Cone Penetration

Dynamic resistance, which can be used to express strength in the unit of stress and improve the reliability of the dynamic cone penetration test (DCPT), has been estimated by numerous methods. This study aims to compare different dynamic resistance estimation methods by using an instrumented dynamic cone penetrometer (IDCP). DCPTs are conducted using a standard dynamic cone penetrometer (DCP) and IDCP in the laboratory and field. Dynamic responses are obtained from the strain gauges and an accelerometer installed at the cone tip of the IDCP. The test results show that dynamic resistance is more efficient in distinguishing profiles than the dynamic cone penetration index. Among the methods to estimate the dynamic resistance at the cone tip, the force-velocity integration method and force integration method are more related to the conventional dynamic resistance considering the potential energy of the hammer than the force squared integration method. Additionally, the dynamic resistance estimated for a longer time period is more reliable, particularly for small driving rod lengths. Regarding the limitation of the dynamic response from an accelerometer in a previous study, the force-based dynamic resistance estimated for a longer time period can be used as the most reliable approach for further soil strength characterization.

scholarly journals Instrumented Cone Penetrometer for Dense Layer Characterization

Sensors ◽  
2020 ◽  
Vol 20 (20) ◽  
pp. 5782
Author(s):  
Jong-Sub Lee ◽  
Yong-Hoon Byun
Keyword(s):  
Strain Gauges ◽  
Dense Layer ◽  
Cone Penetrometer ◽  
Cone Penetration ◽  
Cone Resistance ◽  
Subsurface Characterization ◽  
Penetration Index ◽  
Novel Approach ◽  
Infrastructure Design ◽  
Dynamic Cone Penetration

Subsurface characterization is essential for a successful infrastructure design and construction. This paper demonstrates the use of an instrumented cone penetrometer (ICP) for a dense layer characterization at two sites. The ICP consists of a cone tip and rods equipped with an accelerometer and four strain gauges, which allow dynamic driving, in addition to quasi-static pushing of the cone. The force and velocity of the cone are measured using the ICP instrumentation and compared with the N value, dynamic cone penetration index, and static cone resistance. A strong correlation has been observed between the total cone resistance estimated from the ICP and the dynamic cone penetration index and static cone resistance. After the correction of the dynamic cone resistance effect, the static component of the total cone resistance can be used as an alternative to a static cone resistance. This novel approach of soil resistance estimation using the ICP may be useful for dense layer characterization.

Use of in Situ Tests in Compaction Control of a Bottom Ash Embankment

2008 ◽  
Vol 2045 (1) ◽  
pp. 10-18 ◽  
Author(s):  
Nayyar Zia Siddiki ◽  
Athar Khan ◽  
Daehyeon Kim ◽  
Travis Cole
Keyword(s):  
Bottom Ash ◽  
Coal Ash ◽  
Test Methods ◽  
Cone Penetration ◽  
In Situ Tests ◽  
Recycled Materials ◽  
Compaction Control ◽  
Dynamic Cone Penetration Test ◽  
Dynamic Cone Penetration

Since 1994, the Indiana Department of Transportation has constructed numerous recycled materials projects that use bottom ash, fly ash, foundry sand, crushed glass, and tire shreds in transportation facilities. All these projects were constructed in accordance with procedural specifications based on conventional compaction control tests such as the nuclear gauge. However, the nuclear gauge does not give accurate density and moisture content results because of the presence of numerous elements in recycled materials. In addition, sand cone tests are cumbersome and time-consuming. There is a need to develop criteria for in situ test methods such as the dynamic cone penetration test and lightweight deflectometer (LWD) testing. Once an initial criterion is established, criteria for compaction control of similar recycled materials can be developed. In a study, a test pad using coal ash was constructed with a combination of roller passes. On the basis of the results of dynamic cone penetration and LWD tests conducted in the test pad, in conjunction with a combination of roller passes, the criteria for compaction control of bottom ash was provided for the construction of the remaining 11-m-high embankment. The subsequent construction monitoring and postconstruction evaluation of the bottom ash embankment revealed that the criteria are very effective.

FIELD ASSESSMENT OF DYNAMIC CONE PENETRATION TEST TO EVALUATE SAND DENSITY

2015 ◽  
Vol 2 (1) ◽  
Author(s):  
Abdulrahman M. Hamid ◽  
Saad A. Aiban ◽  
Omar S. Baghabra Al-Amoudi
Keyword(s):  
Field Testing ◽  
Cone Penetration Test ◽  
Engineering Properties ◽  
Dry Density ◽  
Penetration Test ◽  
Cone Penetration ◽  
Replacement Method ◽  
Dynamic Cone Penetration Test ◽  
Dynamic Cone Penetration

Rapid and accurate in-situ measurement of soil properties is still a challenge facing the construction industry and there is a need for new and advanced devices and methods. Dynamic cone penetration test (DCPT) is an effective device used for field exploration and quality assessment of subsoil. DCPT could be used to predict the engineering properties of sand because it is difficult to perform conventional density tests, such as the sand replacement method, especially when loose or submerged sandy soil is encountered. Two cases of DCP field testing were conducted in Al-Jubail and Ras Al-Khair, eastern Saudi Arabia, where the major petrochemical industries are located. These tests were utilized to evaluate the potential use of DCPT to assess the density during the construction of backfills, whereby the nuclear gauge was also used to accurately measure the in situ soil density and water content. The DCP-nuclear gauge data clearly indicated that there is a good correlation between the dry density obtained from the nuclear gauge and the dynamic cone penetration (DCP) readings, which proves that the DCPT is an effective and reliable tool in the assessment of in situ compaction of sand backfills.

scholarly journals Application of Dynamic Cone Penetration Test to Gypseous Soils

2017 ◽  
pp. 1-5
Author(s):  
Ahmed A. H. Al-Obaidi ◽  
Qudama A. A. Al-Ashoishi
Keyword(s):  
Laboratory Tests ◽  
Cone Penetration Test ◽  
Penetration Test ◽  
Large Area ◽  
Cone Penetration ◽  
Compacted Soils ◽  
Gypsum Content ◽  
Cylindrical Mold ◽  
Dynamic Cone Penetration Test ◽  
Dynamic Cone Penetration

Dynamic cone penetration test (DCPT) is a fast, economical and easy to conduct. It is widely used to assess the strength of natural and compacted soils. The device is introduced in the 1950s. However, it was newly introduced in Iraq. This study aims to evaluate the potentials of DCP in geotechnical explorations in the gypseous soil since it covers a large area of the country and to obtain correlations with the California bearing ratios (CBR) and investigating the effect of gypsum on the CBR-DCP relationship. Field and Laboratory tests were conducted on soil sample retrieved from six sites with different gypsum contents (28-41) %. Laboratory tests include performing CBR and DCP tests in a cylindrical mold. A statistical analysis of the results shows that gypsum content is an affecting factor on DCP and good CBR-DCP correlations on gypsum content were obtained.

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