An experimental study of the dynamic characteristics of cement soils subjected to staged cyclic loading
With the change in vehicle loading, the load amplitude will also change. However, most of the existing studies focused on the dynamic characteristics of cement soil under the constant dynamic loading, and the dynamic characteristics of cement soil under staged cyclic loading were seldom examined. Us...
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| Format: | Article |
| Language: | zho |
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Editorial Office of Hydrogeology & Engineering Geology
2021-03-01
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| Series: | Shuiwen dizhi gongcheng dizhi |
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| Online Access: | https://www.swdzgcdz.com/en/article/doi/10.16030/j.cnki.issn.1000-3665.202007042 |
| _version_ | 1811169544205500416 |
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| author | Zhen ZHANG Yong CHEN Tianliang YANG Guanbao YE Wenqiang ZHENG |
| author_facet | Zhen ZHANG Yong CHEN Tianliang YANG Guanbao YE Wenqiang ZHENG |
| author_sort | Zhen ZHANG |
| collection | DOAJ |
| description | With the change in vehicle loading, the load amplitude will also change. However, most of the existing studies focused on the dynamic characteristics of cement soil under the constant dynamic loading, and the dynamic characteristics of cement soil under staged cyclic loading were seldom examined. Using the GDS dynamic triaxial apparatus, a series of dynamic triaxial tests of cement soil are carried out to investigate the influence of static deviator stress and confining stress on the dynamic characteristics of cement soil. The results show that the axial plastic strain of cement soil increases with the increasing confining stress and static deviator stress ratio. The axial strain of cement soil is in the range of 0.1%～0.5%, and its strain development belongs to a stable type. The staged loading and unloading have a great influence on the development process of the plastic strain of the cement soil, but have little influence on the ultimate strains. The empirical model of plastic strain considering loading and unloading conditions, confining stress and static deviator stress ratio is established. The correlation coefficient of staged unloading is greater than 0.95, while that of staged loading is between 0.8 and 0.9. The results show that the first stage load plays a leading role in the strain development, while the maximum dynamic stress ratio cannot dominate the strain development when the first stage load is small. Under the condition of staged loading and unloading, the backbone curve of the cement soil shows two modes: ascending type and descending type, which can be simplified as a multi-segment straight line. Based on the established cumulative plastic strain calculation method, a method to determine the dividing point of the multi segment straight line is proposed, and its feasibility is also verified. The research results lay a foundation for systematic analyses of the dynamic mechanical properties of cement soil under traffic loading. |
| first_indexed | 2024-04-10T16:44:15Z |
| format | Article |
| id | doaj.art-50dadc81166a49538ec393ed6f406ee7 |
| institution | Directory Open Access Journal |
| issn | 1000-3665 |
| language | zho |
| last_indexed | 2024-04-10T16:44:15Z |
| publishDate | 2021-03-01 |
| publisher | Editorial Office of Hydrogeology & Engineering Geology |
| record_format | Article |
| series | Shuiwen dizhi gongcheng dizhi |
| spelling | doaj.art-50dadc81166a49538ec393ed6f406ee72023-02-08T01:30:07ZzhoEditorial Office of Hydrogeology & Engineering GeologyShuiwen dizhi gongcheng dizhi1000-36652021-03-01482899610.16030/j.cnki.issn.1000-3665.202007042202007042An experimental study of the dynamic characteristics of cement soils subjected to staged cyclic loadingZhen ZHANG0Yong CHEN1Tianliang YANG2Guanbao YE3Wenqiang ZHENG4Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, ChinaDepartment of Geotechnical Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, ChinaShanghai Institute of Geological Survey, Shanghai 200072, ChinaDepartment of Geotechnical Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, ChinaDepartment of Geotechnical Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, ChinaWith the change in vehicle loading, the load amplitude will also change. However, most of the existing studies focused on the dynamic characteristics of cement soil under the constant dynamic loading, and the dynamic characteristics of cement soil under staged cyclic loading were seldom examined. Using the GDS dynamic triaxial apparatus, a series of dynamic triaxial tests of cement soil are carried out to investigate the influence of static deviator stress and confining stress on the dynamic characteristics of cement soil. The results show that the axial plastic strain of cement soil increases with the increasing confining stress and static deviator stress ratio. The axial strain of cement soil is in the range of 0.1%～0.5%, and its strain development belongs to a stable type. The staged loading and unloading have a great influence on the development process of the plastic strain of the cement soil, but have little influence on the ultimate strains. The empirical model of plastic strain considering loading and unloading conditions, confining stress and static deviator stress ratio is established. The correlation coefficient of staged unloading is greater than 0.95, while that of staged loading is between 0.8 and 0.9. The results show that the first stage load plays a leading role in the strain development, while the maximum dynamic stress ratio cannot dominate the strain development when the first stage load is small. Under the condition of staged loading and unloading, the backbone curve of the cement soil shows two modes: ascending type and descending type, which can be simplified as a multi-segment straight line. Based on the established cumulative plastic strain calculation method, a method to determine the dividing point of the multi segment straight line is proposed, and its feasibility is also verified. The research results lay a foundation for systematic analyses of the dynamic mechanical properties of cement soil under traffic loading.https://www.swdzgcdz.com/en/article/doi/10.16030/j.cnki.issn.1000-3665.202007042staged cyclic loadingdynamic triaxial testscement soilplastic strainbackbone curveempirical model |
| spellingShingle | Zhen ZHANG Yong CHEN Tianliang YANG Guanbao YE Wenqiang ZHENG An experimental study of the dynamic characteristics of cement soils subjected to staged cyclic loading Shuiwen dizhi gongcheng dizhi staged cyclic loading dynamic triaxial tests cement soil plastic strain backbone curve empirical model |
| title | An experimental study of the dynamic characteristics of cement soils subjected to staged cyclic loading |
| title_full | An experimental study of the dynamic characteristics of cement soils subjected to staged cyclic loading |
| title_fullStr | An experimental study of the dynamic characteristics of cement soils subjected to staged cyclic loading |
| title_full_unstemmed | An experimental study of the dynamic characteristics of cement soils subjected to staged cyclic loading |
| title_short | An experimental study of the dynamic characteristics of cement soils subjected to staged cyclic loading |
| title_sort | experimental study of the dynamic characteristics of cement soils subjected to staged cyclic loading |
| topic | staged cyclic loading dynamic triaxial tests cement soil plastic strain backbone curve empirical model |
| url | https://www.swdzgcdz.com/en/article/doi/10.16030/j.cnki.issn.1000-3665.202007042 |
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