2021 Volume 77 Issue 2 Pages I_487-I_492
Authors have developed a technique called the cement-mixing and mechanical dehydration method. This technique enables to manufacture high strength soil block bycement-mixing and mechanical dehydration.The purposeof this study is to evaluate the effect of a radial drainage to accelerate consolidation and investigate the consolidation and strength characteristics of soil block. Furthermore, the consolidation behavior and unconfined compressive strength were estimated by the radial drainage theory. The results obtained from this study are summarized below.
(1) It took about 45 hours to complete the consolidation for soil block without a radial drainage. The consolidation time was shortened to about 370 minutes byusing a radial drainage.The radial drainage mechanism was extremely effective in shortening the consolidation of soil block.
(2) The water content of the soil block for the cement content of 40 % was reduced by about 40 % by using a radial drainage.The unconfined compressive strength ofthe soil block with cement content of40 % was 10.56 MPa at28 curing days. By using a radial drainage, the water content of the block decreased, and the strength increased.
(3) The consolidation coefficient obtained fromthe constant strain rate consolidation test, it was the most effective for consolidation prediction using the radial drainage theory. The prediction result considering the well resistance was 130 minutes faster than the actual consolidation behavior. Furthermore, the strength estimation using the radial drainage theory indicated high accuracy with an error of 1.5 MPa (14%) or less.
