Thermal-conduction CPTU probe

Abstract

The invention discloses a thermal-conduction CPTU probe. The thermal-conduction CPTU probe comprises a testing device, a control apparatus and a data acquisition apparatus, the testing device comprises a probe rod, a heating module, a pressure module and the probe which are connected from up to down; the control apparatus comprises a direct current stabilized power source, the direct current stabilized power source is connected with the heating module through a lead in the probe rod; and the data acquisition apparatus is connected with a temperature sensor arranged on the heating module through the lead in the probe rod. The direct current stabilized power source provides electric energy to the testing probe and the heating module; and the data acquisition apparatus collects the monitoring data of the temperature sensor. The thermal-conduction CPTU probe has the advantages of easy operation, short test period, and low test cost.

Description

technical field [0001] The invention belongs to the field of in-situ testing of rock and soil, and in particular relates to a heat conduction CPTU probe capable of measuring thermophysical parameters of rock and soil. Background technique [0002] Accurate acquisition of thermophysical parameters of rock and soil is a prerequisite for the rationality of temperature field calculation in underground engineering. The thermophysical testing methods of rock and soil mainly include indoor experiment method and in-situ test method. The indoor experimental method includes the hot wire method and the hot-line method. The principle is that the temperature of the sample changes with time during the measurement, and the thermal conductivity is derived by measuring the temperature change. The indoor experiment has the advantages of quickness, convenience, and low test cost. The original structure and state of rock and soil are destroyed, and the obtained thermophysical parameters cannot ...

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Problems solved by technology

The indoor experimental method includes the hot wire method and the hot-line method. The principle is that the temperature of the sample changes with time during the measurement, and the thermal conductivity is derived by measuring the temperature change. The indoor experiment has the advantages of quickness, convenience, and low test cost. The original structure and state of rock and soil are destroyed, and the obtained thermophysical parameters cannot faithfully reflect the heat transfer characteristics of rock and soil, and the test accuracy is limited; in-situ test methods include thermal probe method and rock and soil thermal response test method, The principle of the thermal probe test is to insert a heating probe into the rock and soil body to monitor the temperature change of the rock and soil mass over time, thereby deriving the thermal physical parameters of the rock and soil mass. impact, but its test depth is limited, and it cannot be applied to the thermal physical property test of hard rock and soil; the thermal response test of rock and soil is to use heating equipment to input heat or cold into the vertical buried pipe heat exchanger, and monitor the heat exchanger Inlet and outlet temperature and flow velocity of the medium heat transfer circulation medium, using the heat transfer model to invert the thermophysical parameters of rock and soil

The thermal response test of rock and soil can accurately reflect the geological conditions of the construction site, and can obtain more accurate average thermal conductivity coefficient of soil and thermal resistance of drilling, etc., but the thermal response test of rock and soil cannot obtain the thermal physical parameters of rock and soil at a specified depth

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