Study Plan for Lizzi Scholarship in 2004 IWM

Study Plan for Lizzi Scholarship in 2004 IWM 2004: August 25 th, 2004 Shingo MORIMASA Graduate Student, Geo. Mechanics Group, Toyohashi University of Technology

Contents of my presentation Title and aim of my study p Previous study p n n p Network effect Prestressed micropile method Study plan n n Simulation method of the load bearing behavior Effects of network and prestress

Title and the aim of my study p Title: 　An analytical study on the bearing capacity of the foundation reinforced with prestressed micropiles p Aim: Analytic clarification of the mechanism of the mobilization of load bearing capacity of foundation reinforced with prestressed micropiles

Previous study p Load Bearing Mechanism has been studied by Otani, Tsukada, Miura et al. n n p Laboratory model loading tests n n p “Model Loading Tests on The Footing Reinforced with Prestressed Micropiles” “Large-Scaled Field Loading Test on The Footing Reinforced with Prestressed Micropiles” Network effect Effect of prestress Filed loading tests n Verification of the prestressed micropile method

Laboratory Loading Tests Test apparatus

Network Effect Index Ine Footing reinforced with micropile Bearing capacity Only footing Only micropile

Laboratory Loading Test results for network effect Network effect Degree of settlement p Dense ground --- bearing capacity was improved (Network effect was mobilized) p Medium, loose ground --- Network effect wasn’t mobilized

Effect of Prestress

Model footing for applying Laboratory Loading Test prestress

Laboratory Loading Test results for prestress effect With prestress Network effect Degree of settlement p Even in the medium loose ground, bearing capacity was improved due to network effect by prestress

Field loading tests Plan view Vertical Loading test Horizontal Loading test Cross section

Field Loading Test The results for prestress effect With prestress Without prestress Summation of footing and 8 micropiles Vertical loading test Horizontal loading test Also in field loading test, network effect was mobilized. The effect of prestress was significant in the horizontal movement control.

Development of simulation method p Simulation method would be n p Appropriate constitutive model for n p Non-liner, 2 -D or 3 -D FEM　may be necessary confining pressure dependent stress-strain behavior of ground material Appropriated interface for n interaction between micropiles and ground material

Thanks to IWM I am going to conduct this study hereafter, and now preparing for the study. p I’d like to present the results of the study in the IWM meetings next a few years. p I hope that the study contributes the development of the rational design of micropile foundation. p I have decided to go on to the doctoral course, so I’ll do my best to live up to your expectations. p

Thank you for your attention ! End of the Presentation