JP2003129458A5 - - Google Patents

Claims (12)

 Soil in-situ ground using a borehole, characterized by determining the dynamic characteristics of the ground by repeatedly applying a load to the soil layer of the borehole of the borehole provided in the ground and measuring the displacement of the borehole Liquefaction and dynamic property testing method. Liquefaction and dynamic characteristics of the soil in situ using borehole of claim 1 repeatedly, wherein the benzalkonium to loading the load alternately to the plurality of regions of the hole axis of the hole wall of the borehole Test method.  The ground liquefaction and dynamic property testing method in situ using a borehole according to claim 2, wherein a static load is loaded on the intermediate soil layer subjected to repeated tests and the strength is measured. The boring according to claim 1, wherein a vibration or repeated load is alternately applied to one region of a hole wall of the boring hole, and the dynamic characteristics of the ground are known from the relationship between the magnitude of the repeated load, the number of vibrations or the number of repetitions, and the displacement. In-situ liquefaction and dynamic property testing method using holes.  The repeated load consists of three loads: a compressive load loaded in a direction perpendicular to the hole axis, a torsional shear load loaded in a rotation direction around the hole axis, and a shear load loaded in a direction parallel to the hole axis. The ground liquefaction and dynamic characteristic test method using the borehole according to claim 1 or 4, wherein the load is a combination load obtained by combining one or at least two kinds of loads.  A measurement cell that is inserted into a bore hole provided in the ground and presses the hole wall by the pressure of the pressure medium, and a pressure adjusting means that can periodically vary the pressure of the pressure medium in the measurement cell. And a displacement detecting means for detecting the displacement of the hole wall, and a ground liquefaction and dynamic characteristic testing apparatus in situ using a boring hole. 7. The boring according to claim 6, wherein the measuring cell is divided into a plurality of chambers that press the hole wall along the bore axis direction of the boring hole, and the pressure adjusting stage alternately applies pressure to the pressure medium in the plurality of chambers. In-situ liquefaction and dynamic property testing equipment using holes. 8. The ground liquid at an in-situ position using a boring hole according to claim 7, wherein the pressure adjusting means repeatedly applies pressure alternately to the upper and lower chambers across the intermediate chamber and applies static pressure to the intermediate chamber. And dynamic property testing equipment.  Torque generating means for repeatedly applying a load around the hole axis to the measuring cell while the measuring cell is in close contact with the hole wall, and displacement detecting means for detecting rotational displacement of the hole wall due to the repeated load applied by the torque generating means An in-situ liquefaction and dynamic characteristic testing apparatus using the boring hole according to claim 6.  A shear load generating means for repeatedly applying a load to the measurement cell in a direction parallel to the hole axis while the measurement cell is in close contact with the hole wall, and a displacement detection means for detecting axial displacement of the hole wall due to the shear load. An in-situ liquefaction and dynamic characteristic testing apparatus using the boring hole according to claim 6 or 9, characterized by being provided. 6. The ground liquefaction and dynamic characteristics test method in situ using a boring hole according to any one of claims 1 to 5, wherein pore water pressure is measured to verify liquefaction. 11. The ground liquefaction and dynamic characteristic testing apparatus using the borehole according to any one of claims 6 to 10, wherein a pore water pressure gauge is provided in the measurement cell.