DIELECTRIC METHODS AND APPARATUS FOR IN SITU PREDICTION OF POROSITY AND SPECIFIC SURFACE AREA (I.E. SOIL TYPE) AND FOR DETECTION OF HYDROCARBONS, HAZARDOUS WASTE MATERIALS, ANDTHE DEGREE OF MELTING OF ICE AND TO PREDICT IN SITU STRESS STRAIN BEHAVIOR

摘要

DIELECTRIC METHODS AND APPARATUS FOR IN SITUPREDICTION OF POROSITY AND SPECIFIC SURFACEAREA (i. e., SOIL TYPE) AND FOR DETECTION OFHYDROCARBONS, HAZARDOUS WASTE MATERIALS, ANDTHE DEGREE OF MELTING OF ICE AND TO PREDICTIN SITU STRESS-STRAIN BEHAVIORAbstract of the DisclosureA soil probe, comprising, in one form, a cylindri-cal member of insulating material having a pair of metal,electrically conductive, ring electrodes mounted a shortdistance above a conical portion at the lower end of theprobe, these ring electrodes lie flush with the outersurface of the cylindrical member and are spaced apartfrom each other by the insulating material. An electrical-electronic measuring system is connected to the electrodesby conductors providing identical line impedance for eachring. The system has an initial electronic portion insidethe cylindrical member and close to the electrodes and hasa second portion distant from the cylindrical member. Aplurality of different frequencies of radio-frequencycurrent is applied to the electrodes, for accuratedetermination of capacitance at the different frequencies.Therefrom are determined the dielectric dispersioncharacteristics of the soil. A soil probe with threeelectrodes in a cylindrical tube can be used to predictthe stress-strain behavior in situ and properties such as.lambda., k, and M from such measured properties as , .DELTA..epsilon., and versus k.