Evaluation of mechanism of soil behavior around defected sewerage due to the number of defective area and condition of water-inflow and drainage

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  • KUMANO Naoko
    Institute for Global Change Adaptation Science, Ibaraki University
  • MUKUNOKI Toshifumi
    Graduate School of Science and Technology, Kumamoto University
  • OTANI Jun
    Graduate School of Science and Technology, Kumamoto University

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Other Title
  • 管渠の破損条件と水の流入出条件に着目した下水道管渠周辺地盤のゆるみ・空洞進展特性の解明

Abstract

It has been reported that road subsidence causes the ‘cavity area’ and ‘loosening area’ growth due to water-inflow and drainage from defected sewerage pipe. Therefore, authors have tried to find out the significant factors of this soil behavior. This paper is a study of model test using the X-rays CT to evaluate mechanism of these areas growth. The objective in this study the relationship soil behavior and the condition of defective part in sewerage and condition of water-inflow and drainage is investigated. Here, the model test simulated to the cyclic water-inflow and drainage from defected sewerage pipe was performed using X-ray CT, and the method of definition of ‘cavity area’ and ‘loosening area’ from result of scanning X-ray CT was improved. Hence, the mechanism of soil behavior was evaluated by observing shape and a scale of these areas.

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