SCALED MODEL TESTS OF SOIL ARCHING EFFECT IN GEOSYNTHETIC REINFORCED AND PILE SUPPORTED EMBANKMENTS
XU Chao1，2，SONG Shitong1，2
(1. Department of Geotechnical Engineering，Tongji University，Shanghai 200092，China；2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education，Tongji University，Shanghai 200092，China)
Abstract：A series of scaled model tests were conducted to study the influence of the net distance between adjacent pile caps and embankment fill properties on the soil arching effect of geosynthetic reinforced and pile supported embankment. The influences of fill cohesion and the distance of adjacent pile caps on soil arching effect and the variation with the surcharge on the top of embankment were analyzed. The results show that：(1) Cohesion makes the soil arching effect stronger，soil pressure on the pile caps becomes larger，while soil pressure between pile caps becomes smaller. Comparing to fill without cohesion，for embankment constructed by fill with cohesion，pile efficacy increases，the settlements of subsoil between pile caps and on the surface of the embankment become smaller under the same load. (2) The arching conditions would be independent of fill cohesion，the height of soil arching is 1.0–1.5 times of the net distance of adjacent pile caps. (3) The greater the distance between adjacent pile caps，the weaker the arching effects，and the smaller the pile efficacy. (4) No matter what fill is or how the distance of adjacent pile caps changes，soil pressure on the pile cap edge is bigger than that over the pile cap center.
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2015, Vol. 34 
