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Rock thermophysics on-site test method under non-constant power condition

An on-site testing, non-constant technology, applied in soil material testing, measuring devices, material thermal analysis, etc., can solve problems such as power instability, test failure, and long test cycle, so as to reduce stability requirements and test costs , the effect of shortening the test time

Inactive Publication Date: 2009-05-13
SHANDONG JIANZHU UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method with simple method, convenient operation, which can effectively overcome power supply interruption and large voltage fluctuation in order to solve the problems of power instability in the current geotechnical thermal physical property testing process, which leads to test failure or too long test cycle. On-the-spot test method of thermal physical properties of rock and soil under non-constant power conditions due to inaccurate test

Method used

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  • Rock thermophysics on-site test method under non-constant power condition
  • Rock thermophysics on-site test method under non-constant power condition
  • Rock thermophysics on-site test method under non-constant power condition

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Embodiment

[0058] The method of the invention is used to test the thermal physical parameters of underground rock and soil in a construction site. In this test, the depth of the buried pipe is 100 meters, and the geological composition is: 1-3 meters is clay, and 3-100 meters is sandstone. About 24 hours after the start of the test, the heating of the tester was interrupted for about 40 minutes due to power supply. After restarting the heater, the test continued for about 4 hours, and the heating was interrupted again for about 14 hours due to power supply. Thereafter, restart the heater again, continue the test for about 6 hours, and then stop the test. The test results show that the average thermal conductivity of underground rock and soil is 3.18W / m℃, and the average volumetric specific heat is 2.59×10 6 J / m3 ℃. Figure 4 It is a comparison between the actual measurement of the change of the average temperature of the circulating water in the buried pipe with time and the average t...

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Abstract

The invention discloses an onsite thermal property testing method under the condition of a non-constant power. The trend of a heating power or cooling power changing with time is analyzed under the condition of power instability such as the interruption of a power supply and large fluctuation of voltage, and by dividing the non-constant power into a plurality of sections in terms of time, wherein, the power of each section is comparatively constant (the power can be considered as zero when heating or cooling are interrupted); the heat-transfer process of buried pipes is considered to undergo a plurality of step heating flux actions which are further disintegrated into a superposition of a plurality of thermal pulses; linear superposition principle is adopted for analyzing and a mathematical model is established; and ground thermal property parameters can be obtained by integrating the mathematical model with a parameter estimation method and other methods.

Description

technical field [0001] The invention relates to an engineering field test method, in particular to a field test method for thermal physical properties of rock and soil under the condition of non-constant power. technical background [0002] Energy conservation and emission reduction is an important measure to ensure social harmony and sustainable economic development. In recent years, the Ministry of Science and Technology and the Ministry of Construction have included ground source heat pump technology using shallow ground energy as key promotional building energy-saving technology projects. The use of ground source heat pump technology in building heating and air conditioning can effectively improve the utilization rate of primary energy and reduce the greenhouse effect gas CO 2 It is a sustainable building energy-saving new technology. [0003] The measured values ​​of underground geotechnical parameters determine the number and depth of boreholes required for undergroun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/24G01N25/00
Inventor 于明志赵啸琳魏建平方肇洪
Owner SHANDONG JIANZHU UNIV
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