RESEARCH ON MECHANISM OF DREDGED CLAYEY SOIL IMPROVED BY DYNAMIC DRAINAGE CONSOLIDATION METHOD
WANG Shanshan1，2，LI Lihui1，LIU Kai3，HU Ruilin1，YU Wenlong1
(1. Key Laboratory of Engineering Geomechanics，Institute of Geology and Geophysics，Chinese Academy of Sciences，Beijing 100029，China；2. China Institute of Geotechnical Investigation and Surveying Ltd.，Beijing 100007，China；
3. Hydrogeology and Engineering Geology Team of Beijing，Beijing 100195，China)
Abstract：To study the mechanism of dynamic consolidation with drainage on dredged clayey soil，the model test is conducted by self-developed large-scale indoor model equipment and the dredged clayey soil from Tianjin is selected as research object. It is focused on monitoring and analyzing the dynamic variation in pore water pressure in tamping process. The model test results indicate that the water content of soil descends，density and shear strength of soil appear significant growth after consolidation. To make up the defect of model tests，numerical simulation is conducted by FLAC3D to discuss the dynamic response characteristics of dredged soil under impact loads. The instantaneous hammer-soil contact stress，displacement of soil skeleton and dynamic variation in pore water pressure are mainly studied. The results of model test and calculation both indicate that the pore water pressure appears sharp increase at the hammer-soil touching moment，and it can be divided by three phases of increasing-stable-descending. The calculation results also show that the contact force doesn?t reach the maximum value at the hammer-soil touching moment. The contact force varies with ramming times and appears several bounces in tamping process. It is also found that the peak pore water pressure and peak displacement are delayed with the increasing depth and radial distance from center of the hammer bottom.
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2011, Vol. 30 
