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Genetic programming for predictions of effectiveness of rolling dynamic compaction with dynamic cone penetrometer test results

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Journal of Rock Mechanics and Geotechnical Engineering 2019年第4期11卷 815-823页

作者： R.A.T.M.Ranasinghe M.B.Jaksa F.Pooya Nejad Y.L.Kuo School of Civil Environmental and Mining Engineering The University of Adelaide

Rolling dynamic compaction (RDC),which employs non-circular module towed behind a tractor,is an innovative soil compaction method that has proven to be successful in many ground improvement *** involves repeatedly delivering high-energy impact blows onto the ground surface,which improves soil density and thus soil strength and ***,there exists a lack of methods to predict the effectiveness of RDC in different ground conditions,which has become a major obstacle to its *** this,in this context,a prediction model is developed based on linear genetic programming (LGP),which is one of the common approaches in application of artificial intelligence for nonlinear *** model is based on in situ density-related data in terms of dynamic cone penetrometer (DCP) results obtained from several projects that have employed the 4-sided,8-t impact roller (BH-1300).It is shown that the model is accurate and reliable over a range of soil ***,a series of parametric studies confirms its robustness in generalizing *** addition,the results of the comparative study indicate that the optimal LGP model has a better predictive performance than the existing artificial neural network (ANN) model developed earlier by the authors.

关键词： Ground improvement Rolling dynamic compaction (RDC) Linear genetic programming (LGP) Dynamic cone penetrometer (DCP) test

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Quantification of displacement and particle crushing around a penetrometer tip

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Geoscience Frontiers 2020年第2期11卷 389-399页

作者： Eshan Ganju Fei Han Monica Prezzi Rodrigo Salgado Juliana Spohr Pereira Lyles School of Civil Engineering Purdue University

Particle crushing occurs near the tip of a penetrometer and influences the development of the tip *** study particle crushing near a penetrometer tip,a cone penetrometer was monotonically jacked and then load-tested in medium dense and dense silica sand samples prepared in a halfcylindrical calibration chamber with viewing *** the tests,images of the advancing penetrometer and the surrounding soil were taken using digital cameras and analyzed to obtain the displacement and strain fields around the penetrometer using the Digital Image Correlation(DIC)***,soil samples were collected near the tip of the penetrometer using a novel agarimpregnation technique and digitized using an X-ray *** digitized samples were analyzed to reconstruct the three-dimensional models of individual particles,generating the gradation and relative breakage parameters of the sand around the cone penetrometer.

关键词： Crushing DIC penetrometer X-ray CT

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Application of a nondestructive method to evaluate the active layer in a cold region

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Research in Cold and Arid Regions 2017年第3期9卷 213-220页

作者： Won-Taek Hong Jong-Sub Lee School of Civil Environmental and Architectural Engineering Korea University

To provide a safe transportation system in an extremely cold region,evaluation needs to be conducted of the thickness and the volumetric water content of the active layer,as they significantly affect frost *** objective of this study was to evaluate the dielectric constant(κ)of the active layer using ground-penetrating radar(GPR)and a dynamic cone penetrometer(DCP);this evaluation was then used to estimate the thickness and the volumetric water content of the active layer.A field located in midwest Alaska was selected as the study site.A GPR survey and two DCP tests were conducted on the surface of the ground,and the ground temperature was *** the GPR survey,travel times of the electromagnetic wave in the active layer were *** addition,the thickness of the active layer was determined by using the dynamic cone penetration index(DCPI)and ground *** using the travel time and travel distance of the electromagnetic wave in the active layer,dielectric constants were calculated as 26.3 and 26.4 for two DCP *** the mean dielectric constant,the volumetric water content was estimated to be 40%~43%,and the thickness of the active layer was evaluated along the GPR survey *** spatial-scaled GPR image showed that the thickness of the active layer varied from 520 mm to 700 mm due to the presence of a puddle,which accelerated the heat *** results show that evaluation of the dielectric constant using the GPR survey and the DCP test can be effectively used to estimate the thickness and the volumetric water content of the active layer.

关键词： active layer dielectric constant dynamic cone penetrometer (DCP) extremely cold region ground-penetrating radar (GPR)

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A Review of the DCP-DN Pavement Design Method for Low Volume Sealed Roads: Development and Applications

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Journal of Transportation Technologies 2019年第4期9卷 397-422页

作者： Philip Paige-Green Gerhardt Daniel Van Zyl Department of Civil Engineering Tshwane University of Technology Pretoria South Africa Mycube Asset Management Systems (Pty) Ltd. Cape Town South Africa.

Widespread implementation of the DCP-DN design method for low volume roads has been promoted internationally over the past decade or so. The method has progressed from a simple determination of the in situ CBR investigation based on DCP-CBR correlations with respective cover requirements to a more sophisticated method using the DCP penetration data directly and omitting any need to use correlations with the CBR. This paper summarises the development of the method, and some of its advantages and compares the design structures with other recognised and widely implemented designs.

关键词： Low Volume Roads Design Dynamic Cone penetrometer DCP CBR

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