System and method for measuring frozen soil permeability coefficients based on nuclear magnetic resonance
A technology of permeability coefficient and nuclear magnetic resonance, which is applied in the fields of nuclear magnetic resonance analysis, permeability/surface area analysis, material analysis through resonance, etc., can solve the problems that cannot meet the requirements of experimental accuracy and reliability, and achieve measurement results precise effect
Active Publication Date: 2019-04-12
XIAN UNIV OF TECH
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These decades-old experimental methods can no longer meet the current requirements for experimental accuracy and reliability
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[0033] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0034] The structure of the permafrost permeability coefficient system measurement system based on nuclear magnetic resonance provided by the invention is as follows: figure 1 As shown, it includes a permeate supply device 1 and a permeation test equipment 3, the permeate supply device 1 and the permeation test equipment 3 are connected through a permeate pressurized conveyor 2, and the permeation test equipment 3 is placed in a low-temperature heat preservation device 5 , the test piece is placed in the penetration test equipment 3;
[0035] It also includes nuclear magnetic resonance equipment (not shown in the figure) and a processor (not shown in the figure). The nuclear magnetic resonance equipment is used to measure the test piece, and the processor is used to calculate the permeability coefficient of the test piece according to the res...
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A system for measuring frozen soil permeability coefficients based on nuclear magnetic resonance in the invention comprises a permeation liquid supply device and a permeation test device. The permeation test device is placed in a cold retaining device. The system further comprises a nuclear magnetic resonance device and a processor. The nuclear magnetic resonance device is used for measuring a test piece. The processor is used for calculating a permeability coefficient of the test piece according to a result measured by the nuclear magnetic resonance device. A method for measuring the frozen soil permeability coefficients comprises: performing nuclear magnetic resonance imaging on a longitudinal section of the test piece before and after a permeation test; obtaining a penetration length; and calculating a permeability using a formula which is as shown in the specification, wherein [Gamma]<w> is a weight of permeation liquid, L is a length of the test piece, t is a penetration time, andP is a pressure of the permeation liquid. According to the system and the method for measuring the frozen soil permeability coefficients based on the nuclear magnetic resonance, the nuclear magneticresonance technology is adopted, so that the measurement result is more accurate and reliable, and moisture migration conditions inside the test piece can be directly observed, thereby achieving visualization of moisture migration during permeation of a frozen soil sample and accurately obtaining the permeability coefficient of the frozen soil.
Description
technical field [0001] The invention belongs to the technical field of soil parameter measurement, in particular to a system for measuring the permeability coefficient of frozen soil based on nuclear magnetic resonance, and also relates to a method for measuring the permeability coefficient of frozen soil based on nuclear magnetic resonance. Background technique [0002] Frozen soil refers to various rocks and soils with a temperature at or below 0°C and containing ice. my country has a vast area of seasonally frozen soil and permafrost areas. Permafrost is mainly distributed in the Qinghai-Tibet Plateau, Greater and Lesser Khingan Mountains, etc. Most areas are mostly seasonally frozen soil, which has the characteristics of freezing in winter and thawing in summer. In permafrost regions, soil freezing makes the research on the mechanism and process of hydrological cycle and engineering geological properties in permafrost regions more complicated. To understand the changes...
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IPC IPC(8): G01N24/08G01N15/08
CPCG01N15/08G01N24/081
Inventor 何敏张浩李宁冯孝鹏
Owner XIAN UNIV OF TECH