Experimental study on dynamic shear modulus and damping ratio of coral sand from Nansha Islands
The physical and engineering mechanical behaviors between coral sand and terrigenous sandy soils are considerably different. To study these behaviours, a series of undrained multistage strain-controlled cyclic triaxial tests were conducted on saturated coral sand from Nansha Islands, South China S...
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| Format: | Article |
| Language: | English |
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SCIENCE PRESS , 16 DONGHUANGCHENGGEN NORTH ST, BEIJING, PEOPLES R CHINA, 100717
2020-01-01
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| Series: | Rock and Soil Mechanics |
| Subjects: | |
| Online Access: | http://rocksoilmech.whrsm.ac.cn/EN/10.16285/j.rsm.2018.7359 |
| _version_ | 1818476821136539648 |
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| author | LIANG Ke HE Yang CHEN Guo-xing |
| author_facet | LIANG Ke HE Yang CHEN Guo-xing |
| author_sort | LIANG Ke |
| collection | DOAJ |
| description | The physical and engineering mechanical behaviors between coral sand and terrigenous sandy soils are considerably
different. To study these behaviours, a series of undrained multistage strain-controlled cyclic triaxial tests were conducted on
saturated coral sand from Nansha Islands, South China Sea. The influence of effective confining pressure 0 p and relative density Dr
on the dynamic shear modulus and damping ratio of coral sand was studied. Compared with the test results of coral sand and
terrigenous sandy soil and gravel, significant differences were found in the maximum shear modulus Gmax, the shapes and the upper
and lower boundaries of shear modulus ratio G/Gmax curves, reference shear strains 0 , the shapes and the upper and lower
boundaries of damping ratio curves. The maximum shear modulus Gmax of coral sand is higher than that of terrigenous sandy soil
and gravel, and the Gmax of coral sand predicted by empirical equations of terrigenous sandy soil is underestimated by 30%. The
nonlinearity of coral sand is slightly weaker than that of terrigenous sandy soil and gravel. The empirical formulas for predicting
G/Gmax and of terrigenous sandy soil and gravel are not applicable for Nansha coral sand. The empirical formulas for predicting
G/Gmax and of coral sand are proposed. |
| first_indexed | 2024-12-10T09:30:15Z |
| format | Article |
| id | doaj.art-49501c90b28d4a2ea563ca64878d4c8a |
| institution | Directory Open Access Journal |
| issn | 1000-7598 |
| language | English |
| last_indexed | 2024-12-10T09:30:15Z |
| publishDate | 2020-01-01 |
| publisher | SCIENCE PRESS , 16 DONGHUANGCHENGGEN NORTH ST, BEIJING, PEOPLES R CHINA, 100717 |
| record_format | Article |
| series | Rock and Soil Mechanics |
| spelling | doaj.art-49501c90b28d4a2ea563ca64878d4c8a2022-12-22T01:54:23ZengSCIENCE PRESS , 16 DONGHUANGCHENGGEN NORTH ST, BEIJING, PEOPLES R CHINA, 100717Rock and Soil Mechanics1000-75982020-01-01411233110.16285/j.rsm.2018.7359Experimental study on dynamic shear modulus and damping ratio of coral sand from Nansha IslandsLIANG Ke0HE Yang1CHEN Guo-xing2Institute of Geotechnical Engineering, Nanjing Tech. University, Nanjing, Jiangsu, 210009, China Institute of Geotechnical Engineering, Nanjing Tech. University, Nanjing, Jiangsu, 210009, China1. Institute of Geotechnical Engineering, Nanjing Tech. University, Nanjing, Jiangsu, 210009, China;2. Civil Engineering and Earthquake Disaster Prevention Center of Jiangsu Province, Nanjing Tech. University, Nanjing, Jiangsu 210009, ChinaThe physical and engineering mechanical behaviors between coral sand and terrigenous sandy soils are considerably different. To study these behaviours, a series of undrained multistage strain-controlled cyclic triaxial tests were conducted on saturated coral sand from Nansha Islands, South China Sea. The influence of effective confining pressure 0 p and relative density Dr on the dynamic shear modulus and damping ratio of coral sand was studied. Compared with the test results of coral sand and terrigenous sandy soil and gravel, significant differences were found in the maximum shear modulus Gmax, the shapes and the upper and lower boundaries of shear modulus ratio G/Gmax curves, reference shear strains 0 , the shapes and the upper and lower boundaries of damping ratio curves. The maximum shear modulus Gmax of coral sand is higher than that of terrigenous sandy soil and gravel, and the Gmax of coral sand predicted by empirical equations of terrigenous sandy soil is underestimated by 30%. The nonlinearity of coral sand is slightly weaker than that of terrigenous sandy soil and gravel. The empirical formulas for predicting G/Gmax and of terrigenous sandy soil and gravel are not applicable for Nansha coral sand. The empirical formulas for predicting G/Gmax and of coral sand are proposed.http://rocksoilmech.whrsm.ac.cn/EN/10.16285/j.rsm.2018.7359nansha coral sandmaximum shear modulusshear modulus ratiodamping ratiocyclic triaxial test |
| spellingShingle | LIANG Ke HE Yang CHEN Guo-xing Experimental study on dynamic shear modulus and damping ratio of coral sand from Nansha Islands Rock and Soil Mechanics nansha coral sand maximum shear modulus shear modulus ratio damping ratio cyclic triaxial test |
| title | Experimental study on dynamic shear modulus and damping ratio of coral sand from Nansha Islands |
| title_full | Experimental study on dynamic shear modulus and damping ratio of coral sand from Nansha Islands |
| title_fullStr | Experimental study on dynamic shear modulus and damping ratio of coral sand from Nansha Islands |
| title_full_unstemmed | Experimental study on dynamic shear modulus and damping ratio of coral sand from Nansha Islands |
| title_short | Experimental study on dynamic shear modulus and damping ratio of coral sand from Nansha Islands |
| title_sort | experimental study on dynamic shear modulus and damping ratio of coral sand from nansha islands |
| topic | nansha coral sand maximum shear modulus shear modulus ratio damping ratio cyclic triaxial test |
| url | http://rocksoilmech.whrsm.ac.cn/EN/10.16285/j.rsm.2018.7359 |
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