Laboratory Testing to Research the Micro-Structure and Dynamic Characteristics of Frozen–Thawed Marine Soft Soil
The use of artificial freezing can change the mechanical properties of marine clay. In the construction of cross passages in metro tunnels in which the artificial ground freezing (AGF) method is applied, freeze–thaw circulation and cyclic loading could weaken the engineering properties of...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2019-03-01
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| Series: | Journal of Marine Science and Engineering |
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| Online Access: | https://www.mdpi.com/2077-1312/7/4/85 |
| _version_ | 1818644205525794816 |
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| author | Zhi Ding Bowen Kong Xinjiang Wei Mengya Zhang Baolong Xu Fangjie Zhao |
| author_facet | Zhi Ding Bowen Kong Xinjiang Wei Mengya Zhang Baolong Xu Fangjie Zhao |
| author_sort | Zhi Ding |
| collection | DOAJ |
| description | The use of artificial freezing can change the mechanical properties of marine clay. In the construction of cross passages in metro tunnels in which the artificial ground freezing (AGF) method is applied, freeze–thaw circulation and cyclic loading could weaken the engineering properties of the clay, thus resulting in differential settlement. In this paper, the authors studied the dynamic properties of frozen–thawed soils under cyclic loading, with the help of dynamic triaxial testing. According to the dynamic triaxial test results and the images from scanning electron microscopy (SEM), the authors explained the weakening effect of both the freeze–thaw cycle and dynamic loading on soft soil. After freezing, the number of large pores increased. In addition, after cyclic loading, the pore structure of the soil showed a tendency towards compaction, which led to the large pores breaking into small ones. Subsequently, the potential reasons for the change of macroscopic dynamic characteristics were explained from a micro-scale point of view. |
| first_indexed | 2024-12-17T00:11:09Z |
| format | Article |
| id | doaj.art-2515b680a6004620ad7ae0dc95debaf2 |
| institution | Directory Open Access Journal |
| issn | 2077-1312 |
| language | English |
| last_indexed | 2024-12-17T00:11:09Z |
| publishDate | 2019-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Journal of Marine Science and Engineering |
| spelling | doaj.art-2515b680a6004620ad7ae0dc95debaf22022-12-21T22:10:50ZengMDPI AGJournal of Marine Science and Engineering2077-13122019-03-01748510.3390/jmse7040085jmse7040085Laboratory Testing to Research the Micro-Structure and Dynamic Characteristics of Frozen–Thawed Marine Soft SoilZhi Ding0Bowen Kong1Xinjiang Wei2Mengya Zhang3Baolong Xu4Fangjie Zhao5Department of Civil Engineering, Zhejiang University City College, Hangzhou 310015, ChinaResearch Center of Coastal and Urban Geotechnical Engineering, College of Architecture and Civil Engineering, Zhejiang University, Hangzhou 310015, ChinaDepartment of Civil Engineering, Zhejiang University City College, Hangzhou 310015, ChinaDepartment of Civil Engineering, Zhejiang University City College, Hangzhou 310015, ChinaDepartment of Civil Engineering, Zhejiang University City College, Hangzhou 310015, ChinaDepartment of Civil Engineering, Zhejiang University City College, Hangzhou 310015, ChinaThe use of artificial freezing can change the mechanical properties of marine clay. In the construction of cross passages in metro tunnels in which the artificial ground freezing (AGF) method is applied, freeze–thaw circulation and cyclic loading could weaken the engineering properties of the clay, thus resulting in differential settlement. In this paper, the authors studied the dynamic properties of frozen–thawed soils under cyclic loading, with the help of dynamic triaxial testing. According to the dynamic triaxial test results and the images from scanning electron microscopy (SEM), the authors explained the weakening effect of both the freeze–thaw cycle and dynamic loading on soft soil. After freezing, the number of large pores increased. In addition, after cyclic loading, the pore structure of the soil showed a tendency towards compaction, which led to the large pores breaking into small ones. Subsequently, the potential reasons for the change of macroscopic dynamic characteristics were explained from a micro-scale point of view.https://www.mdpi.com/2077-1312/7/4/85marine soft soilAGFfrozen–thawed cycledynamic triaxial testcyclic loadingSEMmicro-structure |
| spellingShingle | Zhi Ding Bowen Kong Xinjiang Wei Mengya Zhang Baolong Xu Fangjie Zhao Laboratory Testing to Research the Micro-Structure and Dynamic Characteristics of Frozen–Thawed Marine Soft Soil Journal of Marine Science and Engineering marine soft soil AGF frozen–thawed cycle dynamic triaxial test cyclic loading SEM micro-structure |
| title | Laboratory Testing to Research the Micro-Structure and Dynamic Characteristics of Frozen–Thawed Marine Soft Soil |
| title_full | Laboratory Testing to Research the Micro-Structure and Dynamic Characteristics of Frozen–Thawed Marine Soft Soil |
| title_fullStr | Laboratory Testing to Research the Micro-Structure and Dynamic Characteristics of Frozen–Thawed Marine Soft Soil |
| title_full_unstemmed | Laboratory Testing to Research the Micro-Structure and Dynamic Characteristics of Frozen–Thawed Marine Soft Soil |
| title_short | Laboratory Testing to Research the Micro-Structure and Dynamic Characteristics of Frozen–Thawed Marine Soft Soil |
| title_sort | laboratory testing to research the micro structure and dynamic characteristics of frozen thawed marine soft soil |
| topic | marine soft soil AGF frozen–thawed cycle dynamic triaxial test cyclic loading SEM micro-structure |
| url | https://www.mdpi.com/2077-1312/7/4/85 |
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