Study on the Influence of Sand Core Compactness on Surface Entropy considering Engineering Disturbance
In order to explore the correlation between the compactness of sand core samples and its surface image features and to provide the basis for rapid identification and recognition of core samples in engineering investigation, a typical image data set of sand core samples disturbed by drilling construc...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2021-01-01
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| Series: | Advances in Civil Engineering |
| Online Access: | http://dx.doi.org/10.1155/2021/9986873 |
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| _version_ | 1832561423849357312 |
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| author | Ding-li Su Hang Chen Xuemiao Xu Mengxiong Tang He-song Hu |
| author_facet | Ding-li Su Hang Chen Xuemiao Xu Mengxiong Tang He-song Hu |
| author_sort | Ding-li Su |
| collection | DOAJ |
| description | In order to explore the correlation between the compactness of sand core samples and its surface image features and to provide the basis for rapid identification and recognition of core samples in engineering investigation, a typical image data set of sand core samples disturbed by drilling construction in practical engineering has been established, using Python language to compile algorithm to calculate one-dimensional entropy and two-dimensional entropy of 60 groups of sand core samples with different densities. The influence of different sand core compactness on surface entropy characteristics was discussed, and the following conclusions were obtained: (1) Affected by drilling construction and disturbance, the looser the sand core surface particles are, the worse the sorting is and the more irregular the shape characteristics are. There is a close relationship between grain texture and compactness. (2) The calculation results of sand image entropy of one-dimensional entropy and two-dimensional entropy showed that the entropy value of loose, slightly dense, and medium dense sand images is positively correlated with the compactness of sand. (3) The maximum variance of two-dimensional entropy of loose, slightly dense, and medium dense sand image in the same borehole is less than 0.09, and the data variance amplification effect of two-dimensional entropy of image is mainly between different boreholes. (4) The dense feature of core sample structure forms an ordered structure with a gray change boundary, which increases the roughness of the image and leads to the increase of entropy. The two-dimensional entropy reveals the internal correlation mechanism of the influence of the engineering state on the surface structure of sand more clearly than the one-dimensional entropy and more effectively characterizes the dense degree of sand particles. (5) Using two-dimensional entropy to judge the compactness of sand image in the same borehole, the data fluctuation is small, and the algorithm is stable and reliable. The research results have reference values for the detection and analysis of sand sample density in geotechnical engineering investigation. |
| format | Article |
| id | doaj-art-4f5f9a671cc3490fb314950c91c16edc |
| institution | Kabale University |
| issn | 1687-8086 1687-8094 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Civil Engineering |
| spelling | doaj-art-4f5f9a671cc3490fb314950c91c16edc2025-02-03T01:25:00ZengWileyAdvances in Civil Engineering1687-80861687-80942021-01-01202110.1155/2021/99868739986873Study on the Influence of Sand Core Compactness on Surface Entropy considering Engineering DisturbanceDing-li Su0Hang Chen1Xuemiao Xu2Mengxiong Tang3He-song Hu4Guangzhou Institute of Building Science Group Co., Ltd., Guangzhou 510440, ChinaGuangzhou Testing Centre of Construction Quality and Safety Co., Ltd., Guangzhou 510440, ChinaSouth China University of Technology, Guangzhou 511442, ChinaGuangzhou Municipal Construction Group Co., Ltd., Guangzhou 510030, ChinaGuangzhou Institute of Building Science Group Co., Ltd., Guangzhou 510440, ChinaIn order to explore the correlation between the compactness of sand core samples and its surface image features and to provide the basis for rapid identification and recognition of core samples in engineering investigation, a typical image data set of sand core samples disturbed by drilling construction in practical engineering has been established, using Python language to compile algorithm to calculate one-dimensional entropy and two-dimensional entropy of 60 groups of sand core samples with different densities. The influence of different sand core compactness on surface entropy characteristics was discussed, and the following conclusions were obtained: (1) Affected by drilling construction and disturbance, the looser the sand core surface particles are, the worse the sorting is and the more irregular the shape characteristics are. There is a close relationship between grain texture and compactness. (2) The calculation results of sand image entropy of one-dimensional entropy and two-dimensional entropy showed that the entropy value of loose, slightly dense, and medium dense sand images is positively correlated with the compactness of sand. (3) The maximum variance of two-dimensional entropy of loose, slightly dense, and medium dense sand image in the same borehole is less than 0.09, and the data variance amplification effect of two-dimensional entropy of image is mainly between different boreholes. (4) The dense feature of core sample structure forms an ordered structure with a gray change boundary, which increases the roughness of the image and leads to the increase of entropy. The two-dimensional entropy reveals the internal correlation mechanism of the influence of the engineering state on the surface structure of sand more clearly than the one-dimensional entropy and more effectively characterizes the dense degree of sand particles. (5) Using two-dimensional entropy to judge the compactness of sand image in the same borehole, the data fluctuation is small, and the algorithm is stable and reliable. The research results have reference values for the detection and analysis of sand sample density in geotechnical engineering investigation.http://dx.doi.org/10.1155/2021/9986873 |
| spellingShingle | Ding-li Su Hang Chen Xuemiao Xu Mengxiong Tang He-song Hu Study on the Influence of Sand Core Compactness on Surface Entropy considering Engineering Disturbance Advances in Civil Engineering |
| title | Study on the Influence of Sand Core Compactness on Surface Entropy considering Engineering Disturbance |
| title_full | Study on the Influence of Sand Core Compactness on Surface Entropy considering Engineering Disturbance |
| title_fullStr | Study on the Influence of Sand Core Compactness on Surface Entropy considering Engineering Disturbance |
| title_full_unstemmed | Study on the Influence of Sand Core Compactness on Surface Entropy considering Engineering Disturbance |
| title_short | Study on the Influence of Sand Core Compactness on Surface Entropy considering Engineering Disturbance |
| title_sort | study on the influence of sand core compactness on surface entropy considering engineering disturbance |
| url | http://dx.doi.org/10.1155/2021/9986873 |
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