Method for detecting condition of closure of frozen wall by ultrasonic waves
An ultrasonic and frozen wall technology, which is applied in the direction of using ultrasonic/sonic/infrasonic waves, measuring devices, instruments, etc., can solve the problems such as the need for many people, the untimely crossing of the frozen wall, and the inability to quantitatively grasp the crossing of the frozen wall. , to achieve the effect of high detection accuracy and simple detection method
Inactive Publication Date: 2018-10-16
BEIJING CHINA COAL MINE ENG CO LTD +2
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However, when the groundwater flow rate is greater than 5m / d, the frozen wall will not be closed in time, and the frozen wall will open windows.
[0003] At present, the main method of judging and monitoring the intersection of frozen walls is the longitudinal temperature measurement method, but the shape of frozen walls in strata with high groundwater flow rate is irregular and cannot form an ideal frozen soil cylinder.
Therefore, there is still a certain gap between the development of the frozen wall obtained by the mathematical calculation model of the temperature rise of the single-hole permafrost column and the actual situation.
[0004] In addition, since the longitudinal temperature measurement in the freezer needs to go through the steps of "stopping the brine circulation for 4-6 hours → cutting the horns → lowering the temperature measuring line → measuring → lifting the temperature measuring line", it takes a long time to prepare for freezing and requires many people. Inadequacies such as freezing time cannot be accurately controlled
[0005] Because the longitudinal temperature measurement method is affected by the above factors, the deviation between the detection results and the actual situation is relatively large, and it cannot truly meet the technical requirements for quantitatively grasping the status of the frozen wall intersection.
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Embodiment 1
[0030] Such as figure 1 As shown, the method of the present invention by ultrasonic detection freezing wall crossing circle condition, comprises the steps:
[0031] Step 1: Before ultrasonic testing, the freezing hole should be checked and accepted: 1) Check whether there is any foreign matter in the tube, and check whether the tube body is cracked, bent or flattened; 2) The tubes should be basically parallel , the non-parallelism should be controlled below 1‰; 3) After the freezing pipe is installed, the upper opening should be closed to avoid foreign matter falling into the hole and causing blockage; 4) The freezing pipe should be 300mm-500mm higher than the ground surface, and the exposed height should be ensured as much as possible. same.
[0032] Step 2: Calibrate the system delay time t generated by the ultrasonic detector from the transmitting to the receiving instrument system 0 . The calculation method is shown in formula (1).
[0033] t 0 = t 1 +t b +t y (1)...
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The invention discloses a method for detecting the condition of closure of the frozen wall by ultrasonic waves. The ultrasonic wave propagation speed of each soil layer before and after freezing is measured and compared by ultrasonic detection in three stages of the pre-frozen stage, the pre-freezing wall closure stage and the post-frozen wall closure stage, the condition of closure of the frozenwall is detected in time, and the non-closured distance of the frozen wall between two frozen holes is quantitatively determined, so that the non-closured position of the frozen wall is found in time,so as to take remedial measures such as grouting and enhanced freezing. The detection method is simple and the detection accuracy is high.
Description
technical field [0001] The invention relates to a method for detecting the circle-crossing condition of a frozen wall by ultrasonic waves. Background technique [0002] The artificial freezing method has good water sealing performance, and the artificial freezing curtain formed has high strength and good formation resilience, so this method has become the preferred method for underground engineering construction in unstable water-bearing formations. However, when the groundwater flow rate is greater than 5m / d, phenomena such as untimely closing of the frozen wall and opening of windows in the frozen wall often occur. [0003] At present, the main method of judging and monitoring the intersection of frozen walls is the longitudinal temperature measurement method, but the shape of frozen walls in strata with high groundwater velocity is irregular, which cannot form an ideal frozen soil cylinder. Therefore, there is still a certain gap between the development of the frozen wal...
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CPCG01B17/00
Inventor 张基伟李方政崔灏韩玉福李宁许舒荣高伟周可发郑新赟孔令辉温汉宏王跃王磊高玉骐陈红蕾叶玉西赵玉明
Owner BEIJING CHINA COAL MINE ENG CO LTD