Magnetic method to detect installation depth of sand drain

LI Dingwei; LI Guowei; LIU Rixin; ZHOU Yang; LIU Yanming; HE Guanjun; SHE Mingxing

doi:10.11779/CJGE2024S20047

Volume 46 Issue S2

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Chinese Journal of Geotechnical Engineering > 2024 > 46(S2): 26-31. > DOI: 10.11779/CJGE2024S20047

LI Dingwei, LI Guowei, LIU Rixin, ZHOU Yang, LIU Yanming, HE Guanjun, SHE Mingxing. Magnetic method to detect installation depth of sand drain[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(S2): 26-31. DOI: 10.11779/CJGE2024S20047

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Magnetic method to detect installation depth of sand drain

1.
Guangdong Chaohui Expressway Co., Ltd., Guangzhou 516700, China
2.
Key Laboratory of Rock and Soil Mechanics and Dam Engineering, Ministry of Education, Hohai University, Nanjing 210024, China
3.
Guangdong Communications Planning & Design Institute Group Co., Ltd., Guangzhou 510507, China
4.
College of Civil Engineering, Henan University of Technology, Zhengzhou 450001, China
5.
Qingdao Municipal Engineering Design & Research Institute Co., Ltd., Qingdao 266100, China
6.
Zhongrong Planning & Design Co., Ltd., Changsha 410219, China
7.
Poly Changda Engineering Co., Ltd., Guangzhou 510640, China

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Received Date: June 21, 2024

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Abstract

Abstract

The setting depth of bagged sand well is a technical index to be controlled in the treatment of soft foundations by the drainage consolidation method. It is of great significance to develop an effective method for in-situ testing the depth of bagged sand wells to ensure the treatment effects of the drainage consolidation method. The results show that the average consolidation degree of soft soil foundation is approximately linearly positive correlated with the depth of bagged sand well. The artificial magnetic field set in the sand bag as the detection mark of the end of the bagged sand well has significant recognition. The detection target preset at the bottom of the sand bag has a good success rate when the sand bag is set to a predetermined depth. By controlling the magnetic field strength of the magnetic core in the target and the distance between the two cores, the influences of the natural magnetic field and adjacent targets can be avoided. It has good maneuverability and accuracy to detect the spatial position of the target synchronously with the penetration magnetic sensors in the static penetration mechanical system. The field tests show that the magnetic field method can meet the engineering needs and has a significant cost performance advantage compared with the high pressure water flushing method.
- sand-drain depth,
- target,
- magnetic field strength,
- laboratory test,
- field test

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References

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