Proceedings of the Deep Mixing 2015 Conference, (DFI)
Recent Advantages of CDM-LODIC Method (Low Displacement and Control Method)
Kazuyoshi Kamimura, Shimizu Corporation, Japan; Naoya Matayoshi, Tenox Corporation, Japan; Tsuyoshi Takahashi, Aomi Construction Co., Ltd., Japan; Yuji Yamashita, Fudo Tetra Corporation, Japan
The CDM-LODIC method (cement deep mixing - low displacement and control) method enables ground displacement to be reduced by removing an amount of soil equivalent to that of injected cement slurry and the volume of the plunged mixing tool, which causes a certain degree of ground displacement. Since the CDM-LODIC method was developed in 1985, it has been applied to over 930 sites and the accumulated volume of stabilized soil has now reached 7.6 million cubic meters. In the CDM method, the number of blade rotations per unit depth in the ground when the mixing blades are withdrawn is considered a construction item. The blade rotation number depends on the degree of mixing between the cement slurry and the ground Some field tests were performed based on the degree of mixing between the cement slurry and the ground. In these tests, a new concept of evaluating the blade rotation number when the screw rod penetrates to a given depth without injecting cement slurry has contributed to the degree of mixing. Furthermore, a correlation exists between the coefficient of efficiency of soil removal and the cement slurry admixture rate. In this paper, we discus the data collected in those field tests and present some application examples.
|article #2129; publication #1013 (DM-2015)|