A study of anisotropy of magnetic susceptibility of cohesive soil under unconfined compression
In recent years, the unloading of excavation engineering activities such as foundation pits and tunnels has caused excessive lateral deformation of cohesive soil, which result in more and more engineering accidents. At present, the inclinometer is often used to monitor the horizontal displacement of...
| Main Authors: | , , |
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| Format: | Article |
| Language: | zho |
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Editorial Office of Hydrogeology & Engineering Geology
2021-01-01
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| Series: | Shuiwen dizhi gongcheng dizhi |
| Subjects: | |
| Online Access: | https://www.swdzgcdz.com/en/article/doi/10.16030/j.cnki.issn.1000-3665.202007064 |
| _version_ | 1811169564858253312 |
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| author | Qian SUN Changhong YAN Yang LIU |
| author_facet | Qian SUN Changhong YAN Yang LIU |
| author_sort | Qian SUN |
| collection | DOAJ |
| description | In recent years, the unloading of excavation engineering activities such as foundation pits and tunnels has caused excessive lateral deformation of cohesive soil, which result in more and more engineering accidents. At present, the inclinometer is often used to monitor the horizontal displacement of the soil around the foundation pit. However, due to the special engineering properties of soft soil, the inclinometer cannot be driven to deform with the soft soil during monitoring. The effect of monitoring is often unsatisfactory and inaccurate to reflect the true deformation. Therefore, it is necessary to strengthen the research of lateral deformation monitoring technology of soil in the construction of excavation unloading engineering. In this paper, based on the directional characteristics of the deformation of magnetic minerals under loading, the magnetic fabric test is used to study the magnetic anisotropy of the cohesive soil sample after unconfined compression test and then to compare with the results of the confined one. The paper then discusses the mathematical relationship between the main magnetic susceptibility value and the strain as the consequence of the analysis of the influence of the axial stress and the moisture content of soil on the magnetic anisotropy under unconfined compression. Finally, the feasibility of the calculation of the law of force and the deformation from the magnetic anisotropy of the cohesive soil is explored. The research results show that the deformation of the cohesive soil under force has good consistency with its orientation of magnetic mineral. This understanding has important theoretical significance and practical application value for effectively monitoring the deformation of soft soil around unloading projects in soft soil areas. |
| first_indexed | 2024-04-10T16:44:40Z |
| format | Article |
| id | doaj.art-a70fc31eae294df5a000986e1fbc7b41 |
| institution | Directory Open Access Journal |
| issn | 1000-3665 |
| language | zho |
| last_indexed | 2024-04-10T16:44:40Z |
| publishDate | 2021-01-01 |
| publisher | Editorial Office of Hydrogeology & Engineering Geology |
| record_format | Article |
| series | Shuiwen dizhi gongcheng dizhi |
| spelling | doaj.art-a70fc31eae294df5a000986e1fbc7b412023-02-08T01:30:22ZzhoEditorial Office of Hydrogeology & Engineering GeologyShuiwen dizhi gongcheng dizhi1000-36652021-01-0148112313010.16030/j.cnki.issn.1000-3665.202007064202007064A study of anisotropy of magnetic susceptibility of cohesive soil under unconfined compressionQian SUN0Changhong YAN1Yang LIU2School of Earth Sciences and Engineering, Nanjing University, Nanjing, Jiangsu 210046, ChinaSchool of Earth Sciences and Engineering, Nanjing University, Nanjing, Jiangsu 210046, ChinaGuangzhou Urban Planning & Design Survey Research Institute, Guangzhou, Guangdong 510060, ChinaIn recent years, the unloading of excavation engineering activities such as foundation pits and tunnels has caused excessive lateral deformation of cohesive soil, which result in more and more engineering accidents. At present, the inclinometer is often used to monitor the horizontal displacement of the soil around the foundation pit. However, due to the special engineering properties of soft soil, the inclinometer cannot be driven to deform with the soft soil during monitoring. The effect of monitoring is often unsatisfactory and inaccurate to reflect the true deformation. Therefore, it is necessary to strengthen the research of lateral deformation monitoring technology of soil in the construction of excavation unloading engineering. In this paper, based on the directional characteristics of the deformation of magnetic minerals under loading, the magnetic fabric test is used to study the magnetic anisotropy of the cohesive soil sample after unconfined compression test and then to compare with the results of the confined one. The paper then discusses the mathematical relationship between the main magnetic susceptibility value and the strain as the consequence of the analysis of the influence of the axial stress and the moisture content of soil on the magnetic anisotropy under unconfined compression. Finally, the feasibility of the calculation of the law of force and the deformation from the magnetic anisotropy of the cohesive soil is explored. The research results show that the deformation of the cohesive soil under force has good consistency with its orientation of magnetic mineral. This understanding has important theoretical significance and practical application value for effectively monitoring the deformation of soft soil around unloading projects in soft soil areas.https://www.swdzgcdz.com/en/article/doi/10.16030/j.cnki.issn.1000-3665.202007064unconfined compressionlateral deformationmoisture contentmagnetic anisotropy |
| spellingShingle | Qian SUN Changhong YAN Yang LIU A study of anisotropy of magnetic susceptibility of cohesive soil under unconfined compression Shuiwen dizhi gongcheng dizhi unconfined compression lateral deformation moisture content magnetic anisotropy |
| title | A study of anisotropy of magnetic susceptibility of cohesive soil under unconfined compression |
| title_full | A study of anisotropy of magnetic susceptibility of cohesive soil under unconfined compression |
| title_fullStr | A study of anisotropy of magnetic susceptibility of cohesive soil under unconfined compression |
| title_full_unstemmed | A study of anisotropy of magnetic susceptibility of cohesive soil under unconfined compression |
| title_short | A study of anisotropy of magnetic susceptibility of cohesive soil under unconfined compression |
| title_sort | study of anisotropy of magnetic susceptibility of cohesive soil under unconfined compression |
| topic | unconfined compression lateral deformation moisture content magnetic anisotropy |
| url | https://www.swdzgcdz.com/en/article/doi/10.16030/j.cnki.issn.1000-3665.202007064 |
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