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RISS 인기검색어
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- 저자 : Yuedong Wu (검색결과 2 건)
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An analytical investigation of soil disturbance due to sampling penetration
Diao, Hongguo,Wu, Yuedong,Liu, Jian,Luo, Ruping Techno-Press 2015 Geomechanics & engineering Vol.9 No.6
It is well known that the quality of sample significantly determines the accuracy of soil parameters for laboratory testing. Although sampling disturbance has been studied over the last few decades, the theoretical investigation of soil disturbance due to sampling penetration has been rarely reported. In this paper, an analytical solution for estimating the soil disturbance due to sampling penetration was presented using cavity expansion method. Analytical results in several cases reveal that the soil at different location along the sample centerline experiences distinct phases of strain during the process of sampling penetration. The magnitude of induced strain is dependent on the position of the soil element within the sampler and the sampler geometry expressed as diameter-thickness ratio D/t and length-diameter ratio L/D. Effects of sampler features on soil disturbance were also studied. It is found that the induced maximum strain decreases exponentially with increasing diameter-thickness ratio, indicating that the sampling disturbance will reduce with increasing diameter or decreasing wall thickness of sampler. It is also found that a large length-diameter ratio does not necessarily reduce the disturbance. An optimal length-diameter ratio is suggested for the further design of improved sampler in this study.
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Experimental Study on Soil Deformation during Sampler Penetration
Chuanyang Liang,Jian Liu,Yuedong Wu,Zhongkui Chen,Ruping Luo,Jin Zheng,Yike Meng 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.3
Disturbance at the stage of penetration during soil sampling induces the deformation of samples, causing unreliable results on the determination of soil properties. In order to minimize the disturbance on soil during the penetration process, the displacement field around the tube sampling and influence factors on disturbance are investigated widely. However, there is a lack of effective observation on the development of soil movement at axis and on cross sections with the increase in the penetration depth, which should be studied individually at a certain penetration depth. This paper presents the effect of different sampler penetration depths on the development of soil at central axis and on cross sections through a series of 1-g physical model tests using the particle image velocimetry (PIV) technique. Results show that with the increase in the penetration depth, the correlation between the maximum compression deformation at central axis and the depth corresponding location may be approximated a hyperbola. Moreover, the surface of clay presents the downward compression deformation while that of sand presents the upward deformation. Furthermore, the disturbance influence depth of soil at central axis increases approximately linearly with the increase in the penetration depth. For the sand, the correlation between sensitivity on cross sections and depth presents approximately a line while that of clay presents a hyperbola. These deformation correlations provide useful references for detail predicting the overall deformation curve at a certain penetration depth, which helps to further develop and validate analytical or numerical solutions for this problem.
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