Calculates the horizontal direction stress of the ground due to in situ ground freezing in situ test equipment

摘要

PURPOSE: To determine the horizontal stress of the nonviscous sandy ground or gravelly ground directly at the frozen original position. ;CONSTITUTION: A two-way solenoid valve 5 is provided in the middle of a cell liquid feed pipe 47 connected to a pressure space 42 inside the rubber sleeve 40 of an original position test apparatus. A vertical upward water head pipe 55 branched by the two-way solenoid valve 54 is stored and installed in an adiabatic container 10 provided on a device housing 41. The sealing water 11 submerging the water head pipe 55 is filled in the adiabatic container 10, and a heater 12 heating the sealed water 11 and a temperature sensor 12 measuring the water temperature of the sealing water 11 are provided. The horizontal stress of the ground due to the freezing of the original position ground can be precisely tested with no trouble caused by freezing and with little error caused by the temperature change of water (volume change of water).;COPYRIGHT: (C)1993,JPO&Japio