地中埋設物が水みちと土砂流出時の空洞形成に及ぼす影響 [in Japanese] Influence of buried structures on underground seepage and generation of cavities [in Japanese]
Access this Article
Sinkhole accidents and depressions in urban areas are mainly caused by soil outflow through the breakage of sewer pipes. Underground cavities and loosened zones around those cavities are generated due to such soil outflow. However, some types of cavities are found to have developed close to underground structures, even though there has been no clear breakage in the structures. In this study, the influence of buried structures on the generation of cavities was investigated. A series of permeability tests was conducted to examine the local permeability of the soil at the boundary between the soil and a structure. It was suggested that the boundary between the soil and the structure had higher hydraulic conductivity than that of the ground. Model tests were also carried out to investigate the effects of buried structures on the expansion of cavities and ground deformation. It was revealed that the position of the underground structures strongly affects the generation of ground cavities. It was also observed that ground deformation expands before the expansion of cavities in sandy materials.
- Japanese Geotechnical Journal
Japanese Geotechnical Journal 10(1), 113-125, 2015
The Japanese Geotechnical Society