Behavior experimenting apparatus for deep layer subsoil

TLDR: In this article, an underground construction model is loaded horizontally with a fixed upper lid and a fixed bottom plate, and an external frame 2 is provided with jacks equipped with load cells 3 and 4.

Abstract: PURPOSE:To enable observation of a stress condition under the ground and behavior of a subsoil material in the perimeter of an underground construction model by pressurizing a mobile side plate and a mobile bottom plate from outside to make the subsoil material compressed triaxially while the underground construction model is loaded horizontally. CONSTITUTION:A soil cell 1 is made up of a fixed upper lid 1a, a mobile side plate 1b and a mobile bottom plate 1c and an external frame 2 is provided on an outer circumference of the cell 1. The mobile bottom plate 2a and the mobile side plate 2b of the frame 2 are provided with jacks 3 and 4 equipped with load cells 3A and 4A. A soil manometer and a shear force meter are mounted on the outer circumferential surface of a shaft model 6 and a displacement meter is mounted near the lower part of the model 6. Then, the model 6 is installed in the cell 1 and a subsoil material (e.g. Toyoura standard sand) is fed to prepare a sample. Subsequently, the sample is compressed triaxially to measure a load applied with the load cells 3A and 4A and a soil pressure distribution is measured with a soil manometer. Moreover, the model 6 is pressed with an actuator 9 to measure a soil pressure or the like.