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《China Journal of Highway and Transport》 2017-10
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2D Model Tests of Soil Arching Evolution in Piled Embankments Using Steel Rod Analogical Soil

RUI Rui;ZHANG Long;SUN Yi;XU Lu-chang;XIA Yuan-you;School of Civil Engineering and Architecture,Wuhan University of Technology;  
In order to reveal deformation patterns of piled embankments and soil arching evolution during the settlement of the soil,and provide references for parameter selection of piled embankments,a multitrapdoor test system,in view of interactions between multiple elements in the piled embankments,was developed. The series of trapdoor tests were conducted in consideration of the filling height( H),net spacing( s-a) and width( a) of the piles. Soil arching evolution during the settlement of the soil was observed. Steel rod analogical soil was used as the filling to meet the two-dimension experiment conditions. The effect of the friction on both the front and back plates was eliminated during the test.Particle image velocimetry( PIV) technique was adopted to achieve the whole deformation and several load cells were used to measure the load distribution under the filling. The deformation patterns of the soilarching and the pile-soil stress ratio by dint of different parameters were obtained. The results show that the steel rod analogical soil can accurately simulate the stress-strain behaviors of the soil at the plane. There are two main soil arching evolution patterns of piled embankments,namely,triangular expanding pattern and equal settlement pattern respectively. Compared with the triangular expanding pattern,there is no differential settlement on the embankment surface in the equal settlement pattern. With high soil arching effect,the stress distribution ratio goes on with its trends of a slight decrease. Another tower-shaped evolution pattern can be considered as the transitional pattern between the triangular expanding pattern and the equal settlement pattern. In addition, the application conditions of three evolution models are summarized according to test results. It can be concluded that the relative filling height H/( s-a) of low piled embankments increases through adjusting section sizes of pile-soil,with the purpose of entering the equal settlement pattern.
【Fund】: 国家自然科学基金项目(51208403);; 武汉理工大学国家级大学生创新创业训练计划资助项目(20151049706038);; 湖北省自然科学基金项目(2016CFB469);; 武汉市城建委科技计划项目(201639)
【CateGory Index】: U416.12
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