Abstract:
PROBLEM TO BE SOLVED: To investigate a situation in the vicinity of a bolt tip desired most to be investigated, while avoiding an disturbance due to a rock volt drilled into the ground. SOLUTION: In this underground radar survey method, an electromagnetic wave Ew of prescribed frequency is emitted from a transmission antenna SA arranged on a ground surface GS, into the ground G, and an underground reflected wave Grw reflected with the electromagnetic wave Ew emitted into the ground G, in a reflection point in the ground G, is received by a reception antenna CA arranged on the ground surface GS, a visualization data of underground structure is composed based on a received reflection time and a waveform indicating an intensity of the reflected wave to from an image. At least one of the transmission antenna SA and the reception antenna CA is brought into contact with a base end of the rock bolt RB implanted in the ground G, and at least one of the transmission of the electromagnetic wave Ew and the reception of the underground reflected wave Grw is carried out via the rock bolt RB, in the underground radar survey method. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method for measuring the degree of saturation of ground, which is employed for a ground liquefaction prevention method for unsaturation degree of the ground by injecting air into the ground, which makes the degree of the saturation of the whole prescribed ground measured in a two-dimensional or three-dimensional manner, and which enables the degree of the saturation of the ground to be accurately measured by a combination of two types of measuring methods. SOLUTION: The degree of the saturation of the ground is measured by measuring a dielectric constant of the ground by means of a dielectric constant measuring device. Additionally, the degree of the saturation of the ground is measured by measuring a rate of change of specific resistance of the ground by means of a specific resistance tomography measuring device. A correlation between the degrees of the saturation of the ground is derived from the result of measurement by the specific resistance tomography measuring device and that of measurement by the dielectric constant measuring device. The result of the measurement by the specific resistance tomography measuring device is calibrated on the basis of that of the measurement by the dielectric constant measuring device. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method of conducting geophysical exploration by which the ground immediately under an obstruction for measurement, such as an already existing structure, etc., can be visualized in an arbitrary cross section with high accuracy regardless of the presence/absence of the obstruction. SOLUTION: A drilling head having a nozzle hole from which an excavation liquid is ejected obliquely forward and a transmitting means which transmits its own positional information is connected to the front end rod of a plurality of rods mutually connected in their lengthwise direction in the drilling direction. Traverse-line holes 2 and 3 are formed in an arbitrary direction at an arbitrary depth immediately under the already existing structure 1 by drilling the ground in an arbitrary direction by rotating the drilling head while the drilling liquid is ejected from the nozzle hole. Then sensors 4, 5, and 6 which are required for conducting prescribed geophysical exploration for visualizing the ground with physical values, such as specific electric resistances, etc., are set up in the holes 2 and 3 and the geophysical exploration is conducted.
Abstract:
PROBLEM TO BE SOLVED: To provide a magnetic prospecting method for a metallic elongate member capable of accurately performing magnetic survey of an embedded state of an elongate member such as an earth anchor.SOLUTION: Disclosed is a magnetic prospecting method for a metallic elongate member in which, out of the metallic elongate member 1 (earth anchor) which is embedded in the underground G and left therein, a head part 1a exposed onto the ground is made to pass through a conductive coil 2, the conductive coil 2 is energized to intensify the disturbance of a magnetic field from the elongate member 1, and an embedded state of the elongate member 1 is searched by a magnetic searcher 4.