Multi-layer Rock-soil layer heat conductivity coefficient testing method

A technology of thermal conductivity and testing method, which is applied in the field of layered thermal conductivity testing of rock and soil layers, can solve problems such as changes in the length of buried pipes and the total length of boreholes, and achieve the effect of ensuring long-term high-efficiency operation

Inactive Publication Date: 2017-05-31
NANJING UNIV +1
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Problems solved by technology

Deviations in the length of the borehole will resu

Method used

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  • Multi-layer Rock-soil layer heat conductivity coefficient testing method
  • Multi-layer Rock-soil layer heat conductivity coefficient testing method
  • Multi-layer Rock-soil layer heat conductivity coefficient testing method

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Embodiment Construction

[0035] Such as figure 1 As shown in the figure, the drilling rig is used to drill holes, and temperature measuring cables are installed in the inlet and outlet pipes of the U-shaped underground pipes.

[0036] The length of the temperature measurement cable is 100m, and a total of 11 temperature sensors are arranged at the 2m, 10m, 20m, 30m, 40m, 50m, 60m, 70m, 80m, 90m, and 100m. The corresponding temperature measurement cables 1 are A, B, C, There are 11 probes in D, E, F, G, H, I, J, and k, and the same temperature measurement cable 2 is A1, B1, C1, D1, E1, F1, G1, H1, I1, J1, and k1. The probe divides the formation into 10 formations of 2-10m, 10-20m, 20-30m, 30-40m, 40-50m, 50-60m, 60-70m, 70-80m, 80-90m, and 90-100m.

[0037] The buried pipe enters the water from the right side and flows out from the left side after exchanging heat with the soil, and then flows to the water inlet on the right side. This repeated cycle of heat exchange with the soil finally achieves the ...

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Abstract

The invention provides a multi-layer rock-soil layer heat conductivity coefficient testing method which can accurately obtain thermophysical parameters of a rock-soil body and measure multi-layer soil heat conductivity coefficient under the condition of not disturbing the layers. The method comprises the following steps: boring a hole by means of a drill, and respectively installing temperature measurement cables in water inlet and outlet pipelines of a U-shaped buried pipe; distributing a plurality of temperature measurement probes as measuring points on the temperature measurement cables; measuring the water inlet and outlet temperatures at various measuring points through the temperature measurement probes, and calculating the average heat conductivity coefficient of the layers below the measuring points according to a line heat source theory through a slope method; and calculating the heat conductivity coefficient of each layer on this basis. Under the condition of not disturbing the layers, the thermophysical parameters of a rock-soil body is accurately obtained, the heat conductivity coefficient of each soil layer is measured, the underground soil structure and groundwater flow conditions are known, and the heat exchange capability of a buried pipe heat exchanger is known, thereby providing basic parameters for the design of a ground source heat pump system to ensure the long-time efficient operation of the system.

Description

technical field [0001] The invention relates to a method for testing the layered thermal conductivity of rock and soil layers. Background technique [0002] The thermal physical parameters of rock and soil can be measured in the laboratory by drilling samples, but the collected samples have changed greatly from the actual conditions in the ground, including considerable differences in structure and moisture content, and the samples It also cannot reflect the overall condition of underground rocks and soils at a considerable depth, and the measured results are difficult to use in engineering practice. [0003] The traditional thermal response testing technology can only monitor the temperature of the water inlet and outlet, and roughly estimate the heat transfer capacity of the entire formation. The actual geological situation of the stratum is relatively complex. There are as many as 10 rock and soil layers with different properties within 100m. How to know the heat transfe...

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Application Information

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IPC IPC(8): G01N25/20
CPCG01N25/20
Inventor 李晓昭赵鹏王斌李明洪
Owner NANJING UNIV
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