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| MODEL TEST OF VACUUM PRELOADING WITH CONTROLLED VENTILATION AND ITS MECHANISM ANALYSIS |
| ZHU Ping，SUN Liqiang，YAN Shuwang，JI Yucheng |
| (School of Civil Engineering，Tianjin University，Tianjin 300072，China) |
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Abstract With the development and construction of Binhai New Area，more and more lands are formed by the reclaimed soil with a water content of more than 80%. The vacuum preloading method is the conventional used method to improve the reclaimed soil. Therefore，how to reduce the cost for soil improvement has become an urgent problem to be solved. An improved vacuum preloading method in which the air is introduced at some stages during the period of vacuum preloading. The model test is designed and performed according to the concept of this method. A parallel model test with the conventional used vacuum preloading method is also carried out for comparison. During the tests，the settlement，pore pressure and vacuum pressure in the soil are obtained. The results show that the proposed method is more effective than the conventional vacuum preloading and it can reduce the reinforced time and is cost-effective. Finally，the mechanism of the proposed method is also studied.
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Received: 04 March 2010
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2011, Vol. 30 
