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Abstract The difficulties of pumped vacuum pressure to reach the deep soil and the severe clogging of drainage board in the current method of vacuum preloading lead to unsatisfactory effect in soil reinforcement and are unable to meet the needs of engineering applications. The vacuum preloading technology for the treatment dredged ground with anti-clogging measures was thus proposed. The anti-clogging drainage boards used the filtering membranes of hydrophilic material without concave and convex structures. The membrane and core material were rolled and bonded together to improve the effect of draining. Moreover，the vacuum tubes connected with the PVDs directly and airtightly formed a closed anti-clogging drainage system. As a result，the flow path of vacuum was shortened，the loss of the degree of vacuum along the path was reduced；the vacuum pressure reached the deeper soil layers，the dissipation of pore pressure in soil was accelerated and the effect of soil consolidation was improved. Field and laboratory model tests on the vacuum preloading with and without anti-clogging were carried out；and then the comparison of the experimental results confirmed the effectiveness of the new measures.
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Received: 16 September 2013
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2014, Vol. 33 
