A method for measuring lateral thermal conductivity of rock under uniaxial compression
A technology of uniaxial compression and transverse heat conduction, applied in the field of rock performance testing, to achieve accurate measurement results, reduce thermal resistance, and avoid measurement failures
Active Publication Date: 2020-08-21
BEIJING RES INST OF URANIUM GEOLOGY
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At the same time, this combined structure that sandwiches the thermal conductivity probe between two rock samples can only obtain axial thermal conductivity
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[0039] In the following, the method for measuring the lateral thermal conductivity of rock under uniaxial compression provided by the present invention will be further described in detail with reference to the accompanying drawings and embodiments.
[0040] Taking the granite in the preselected area of the geological repository for high-level radioactive waste in Beishan, Gansu as an example, the method for measuring the lateral thermal conductivity of rock under uniaxial compression provided by the present invention includes the following steps:
[0041] Step 1: Prepare a prismatic rock sample with a square end face;
[0042] Process the drilled complete granite core and prepare it into a size of 45×45×112.5mm 3 The roughness of each surface of the rock sample is less than 3um.
[0043] Step 2: Put the rock sample vertically on the press with matching size and between the lower press head;
[0044] Put the rock sample upright between the upper and lower pressure heads of the press, t...
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The invention belongs to the field of rock performance testing, and particularly relates to a method for measuring lateral thermal conductivity of rock under uniaxial compression. The method comprisesthe following steps that 1, preparing a prismatic rock sample with a square end face; 2, placing the rock sample vertically between an upper pressing head and a lower pressing head of a press machinewith a matching size; 3, using a fixing device to fix a heat conduction probe and a polystyrene foam board on one side of the rock sample; 4, installing an axial extensometer and a lateral extensometer in the middle of the rock sample; 5, conducting uniaxially loading on the rock sample, using a thermal constant analyzer to measure thermal conductivity of the rock sample, and recording corresponding axial stress, axial strain and lateral strain of the rock sample at a measurement point; 6, drawing a change relation diagram in which the thermal conductivity changes along with the axial stress,the axial strain and the lateral strain. According to the method, integrated measurement of the axial stress, the axial strain and the lateral strain of the rock sample under uniaxial compression canbe achieved.
Description
Technical field [0001] The invention belongs to the field of rock performance testing, and specifically relates to a method for measuring the lateral thermal conductivity of rock under uniaxial compression. Background technique [0002] Deep geological disposal is an internationally recognized high-level radioactive waste disposal method. Among all the engineering characteristics of the surrounding rock of the repository, heat conduction is one of the most important factors, which directly affects the overall layout of the repository and the optimization of the spacing between disposal units. The excavation of the repository disturbs the initial stress state of the deep rock mass, causing the surrounding rock stress to redistribute, the stress direction near the excavation surface changes, the stress in the direction perpendicular to the excavation surface is relieved to zero, and stress occurs along the direction of the excavation surface Concentrated, the rock is approximately ...
Claims
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Login to View More IPC IPC(8): G01N25/20
CPCG01N25/20
Inventor 赵星光李鹏飞郭政马利科谢敬礼曹胜飞刘月妙王驹
Owner BEIJING RES INST OF URANIUM GEOLOGY