Abstract
Most of the ground in Japan is soft, leading to great damage in the event of liquefaction. Various ground-improvement measures are being taken to suppress such damage. However, it is difficult to carry out ground-improvement work while checking the internal conditions of the ground during the construction. Therefore, a visible and measurable evaluation of the performance of the ground-improvement work was conducted in this study. The authors performed a simulation analysis of the relative stirred deep mixing method (RS-DMM), a kind of ground-improvement method, using a computer-aided engineering (CAE) analysis based on particle-based methods (PBMs). In the RS-DMM, the “displacement reduction type (DRT)” suppresses displacement during construction. Both the DRT and the normal type (NT) were simulated, and a visible and measurable evaluation was performed on the internal conditions during each construction, the quality of the improved body, and the displacement reduction performance. As an example of these results, it was possible to visually evaluate the discharge of surplus soil by the spiral rod attached to the stirring wing of the DRT. In addition, the authors succeeded in quantitatively showing that more surplus soil was discharged when the stirring wing of the DRT was used than when the stirring wing of the NT was used.
Highlights
Japan is a disaster-prone country that is exposed to the threat of various disasters, such as earthquakes, tsunamis, and floods caused by heavy rains
The conditions during the discharge of surplus soil in the relative stirred deep mixing method (RS-Deep mixing methods (DMMs)) construction were evaluated by the distribution of the moving velocity of the particles
Construction using the stirring wing of the displacement reduction type (DRT) in the RS-DMM is found to be effective for suppressing displacement
Summary
Japan is a disaster-prone country that is exposed to the threat of various disasters, such as earthquakes, tsunamis, and floods caused by heavy rains. There are many soft grounds mainly composed of fine particles, such as clay, silt, and sand, especially in urban waterfront areas, which are the cause of great damage due to liquefaction. The phenomenon of liquefaction was first noticed in the 1964 Niigata Earthquake, and more recently in the Great East Japan Earthquake that occurred on 11 March 2011 and caused substantial damage, especially in Urayasu City, Chiba Prefecture [1,2,3]. The world must protect its land from various disasters, such as earthquakes, tsunamis, and floods caused by heavy rains. It is necessary to improve the land, that is, the ground, so that it is sustainable against disasters
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
