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Low-cost earth pressure and pore pressure gauges using pressure responsible conductive rubber were newly developed to promote the observational procedure during construction. Their performances were tested by indoor and outdoor investigations. The features of the pressure gauge are as follows: (1)Low-cost. The cost of the new pressure gauge is about 160 yen. (2)The pressure-response curve of the pressure responsible conductive rubber tends to migrate with the increase in number of repeated pressure application. Since this migration of the pressure-response curve settles gradually when applied a great number of repeated pressure application, the preliminary application of cyclic repeated loading is needed. (3)Durability and water proofness are proved. (4)The pressure responsible conductive rubber has a property of viscosity (creep) and a relationship between pressure and electric resistance of the rubber shows a hysteresis loop, therefore, it is not appropriate to use for the measurement of dynamic behaviour. (5)Rubber size has an effect on a pressure range at which the rubber is able to respond properly.

LOW-COST EARTH PRESSURE AND PORE PRESSURE GAUGES USING PRESSURE RESPONSIBLE CONDUCTIVE RUBBER