Research on the Application of Bubble Mixed Lightweight Soil in the Filling of Roadbed at the Head of a Super Large Bridge
Based on a typical engineering case of filling the roadbed with bubble mixed lightweight soil at the bridgehead of an extra large bridge,this paper studies the technical points of various processes such as construction preparation stage,mix design,transportation,pouring,and maintenance of bubble mixed lightweight soil filling,and tests and analyzes the filling effect of bubble mixed lightweight soil.The results show that the content of bubble group has a significant impact on the flowability of bubble mixed lightweight soil.For the construction mix proportion of bubble mixed lightweight soil with pumping requirements and wet bulk density W6 and strength CF0.8,it can be determined by using 350 kg of cement,215 kg of water,and 672.1 L of bubble group per cubic meter;the optimal economic pumping distance is within 100 m;bubble mixed lightweight soil is filled in layers and blocks,and the discharge port of the pumping pipe is kept level with the filling surface to reduce disturbance and defoaming;the sloping areas such as longitudinal and transverse slopes are filled with steps and leveled by the pavement base layer;the maximum settlement of the bubble mixed lightweight soil filling section is about 16.6 mm,which is about 27%of the maximum settlement of the ordinary soil filling roadbed,significantly improving the driving stability of the bridgehead section.
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