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Frozen wall development condition judgment and early warning method based on thermo-acoustic coupling algorithm

A freezing wall, acoustic coupling technology, applied in special data processing applications, geometric CAD, design optimization/simulation, etc., can solve the application risk of increasing the water-rich sand layer, can not achieve the early prediction of the freezing wall crossing condition, process monitoring effect evaluation, etc.

Pending Publication Date: 2020-09-18
BEIJING CHINA COAL MINE ENG CO LTD
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, the above three methods are all based on the real-time temperature monitoring results in the temperature measuring hole. When judging the development status of the frozen wall at a position far from the temperature measuring hole, key information such as local frozen wall opening and insufficient strength are often ignored. Increased the application risk of this construction method in water-rich sand layers when the groundwater flow rate is greater than 5m / d
"Early forecast, process monitoring, and effect evaluation" of the frozen wall crossing circle cannot be realized

Method used

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  • Frozen wall development condition judgment and early warning method based on thermo-acoustic coupling algorithm

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Embodiment Construction

[0091] The method for judging and early warning of the development of frozen walls based on the thermal-acoustic coupling algorithm in this example is applied to the interval between Airport South Station and Airport North Station on the north extension of Guangzhou Rail Transit Line 3, and the local curve section is reinforced by freezing method construction.

[0092] 1. Background: The section between Airport South Station and Airport North Station in the north extension section of Guangzhou Rail Transit Line 3 is about 58.80m, and the local curve section is reinforced by freezing method. The thickness of the vaulted top of the tunnel in the frozen section is designed to be 7.63-8.08m, the buried depth of the groundwater level is about 1.0m, the width of the underground excavated tunnel is 12.6m, the height is 8.82m, the cross-sectional area is 90.273m2, and the buried depth of the floor is about 16.0m. In order to control the frost heaving and thawing as much as possible an...

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Abstract

The invention discloses a frozen wall development condition judgment and early warning method based on a thermo-acoustic coupling algorithm, and the method comprises the steps: building an indoor physical test model of two-hole freezing of a water-rich sand layer at a freezing construction preparation stage, and drawing a wave velocity-temperature relation curve; utilizing the wave velocity-temperature relation curve to establish a wave velocity-temperature nonlinear relation expression; obtaining an artificial frozen soil thermo-acoustic coupling algorithm considering phase change; utilizinga thermo-acoustic coupling algorithm to solve the average wave velocity of the designed frozen wall development; calculating a quantitative relationship among different freezing frontal surfaces, non-crossed circle distances and the calculated average wave velocity; and judging and early warning the development condition of the frozen wall by comparing the actually measured and calculated frozen frontal surface and non-crossed circle distance. The method can be used for judging and early warning the abnormal development condition of the frozen wall between any two holes by utilizing the standard, and processing in time. And early prediction, process monitoring and effect evaluation of the intersection condition of the frozen wall can be realized.

Description

technical field [0001] The invention relates to the technical field of detection of frozen wall development status. Specifically, it is a method for judging and early warning of frozen wall development based on thermo-acoustic coupling algorithm. Background technique [0002] The artificial freezing method is a special ground reinforcement method that uses artificial refrigeration technology to freeze the ground around the structure to be built into a continuous closed frozen soil body. This construction method has the advantages of isolating groundwater, increasing soil strength, improving stability, and no pollution. It has been widely used in mine construction, subway construction, foundation pit and comprehensive pipe gallery construction. However, when the artificial freezing method is applied in the water-rich sand layer with a large flow rate, there are often phenomena such as non-intersection of the frozen wall and slow development of the frozen wall, which may easi...

Claims

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Application Information

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IPC IPC(8): G06F30/20G06F30/13
CPCG06F30/20G06F30/13
Inventor 张基伟李方政韩玉福张松高伟许舒荣崔兵兵王磊孔令辉郑新赟孙佳
Owner BEIJING CHINA COAL MINE ENG CO LTD
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