Experimental study of efficient consol idation drainage for tubes filling with soi l material of fine particles
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Abstract:
The co nstr uction speed of embankment with mud2f illed tubes is constra ined by the co nso lidatio n drainag e efficiency af2 ter the filling o f tubes, w hich is r elated to the g radatio n of the f illing soil mater ial. Smaller soil par ticle size r esult s in smaller co nso lidatio n dra inag e efficiency. I n the southeaster n co astal area o f China, ther e a re a lot o f so il mater ial w ith small gr ain size, which can cause ser ious clog g ing w hen they ar e filled into the tubes, and therefo re t he traditio nal co nstr uctio n scheme o f tube filling is no lo ng er applicable. The compar ativ e study of laborat ory tests showed that f illing the tubes w ith the soil mat erial of high content of fine2gr ained part icles can fo rm a soft clay layer at the surface o f tubes and cause difficulty for consolidation. However , o pening o f mud drainag e mo ut h at the surface o f tubes can remov e the mud with fine2gr ained par ticles and then in2 cr ease the dr ainage efficiency. The punching bag precipitation tests also sugg est ed t hat most o f the so il materia l w ith co arser2 gr ained particles appear in the bottom of the bag s while the soil mater ial w ith finer2g rained par ticles occur at the surface of the bag s. The ex istence of drainag e pipe o pening at the surface of the bags w ill not cause loss of coar ser2gr ained so il mater ial.
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