Details
| Original language | English |
|---|---|
| Article number | 107721 |
| Journal | Soil Dynamics and Earthquake Engineering |
| Volume | 165 |
| Early online date | 24 Dec 2022 |
| Publication status | Published - Feb 2023 |
Abstract
In particular during storm events, an accumulation of excess pore pressures may occur in the soil around cyclically loaded offshore foundations which can negatively affect the structural integrity of the foundation. As input for analytical or numerical calculation methods, high-quality laboratory test results are needed. Numerous tests are usually necessary to describe the soil behaviour over the full range of stress and strain boundary conditions. Therefore, an optimization of the test programme in terms of the number of required tests is highly desirable. In the paper, results of an extensive test programme, comprising Resonant Column (RC) and displacement-controlled cyclic Direct Simple Shear (DSS) tests on three sands are presented. Based on the findings, a shear strain threshold concept is developed in which different general soil behaviour of sands under cyclic loading is distinguished by shear strain ranges. The thresholds can be determined by RC tests and multistage cyclic DSS tests. As a main result, the soil response over the full range of possible boundary conditions can be quantified with a combination of only a few RC, multistage DSS and DSS tests. Finally, equations to parametrize the experimental results are discussed.
Keywords
- Cyclic loading, Excess pore pressure, Liquefaction, Shear strain thresholds, Strain-controlled
ASJC Scopus subject areas
- Engineering(all)
- Civil and Structural Engineering
- Earth and Planetary Sciences(all)
- Geotechnical Engineering and Engineering Geology
- Agricultural and Biological Sciences(all)
- Soil Science
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In: Soil Dynamics and Earthquake Engineering, Vol. 165, 107721, 02.2023.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Excess pore pressure accumulation in sands
T2 - A shear strain threshold concept for optimization of a laboratory testing programme
AU - Saathoff, Jann Eike
AU - Achmus, Martin
N1 - Funding Information: The investigations reported were partially funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) - SFB1463 – 434502799 . The support is gratefully acknowledged.
PY - 2023/2
Y1 - 2023/2
N2 - In particular during storm events, an accumulation of excess pore pressures may occur in the soil around cyclically loaded offshore foundations which can negatively affect the structural integrity of the foundation. As input for analytical or numerical calculation methods, high-quality laboratory test results are needed. Numerous tests are usually necessary to describe the soil behaviour over the full range of stress and strain boundary conditions. Therefore, an optimization of the test programme in terms of the number of required tests is highly desirable. In the paper, results of an extensive test programme, comprising Resonant Column (RC) and displacement-controlled cyclic Direct Simple Shear (DSS) tests on three sands are presented. Based on the findings, a shear strain threshold concept is developed in which different general soil behaviour of sands under cyclic loading is distinguished by shear strain ranges. The thresholds can be determined by RC tests and multistage cyclic DSS tests. As a main result, the soil response over the full range of possible boundary conditions can be quantified with a combination of only a few RC, multistage DSS and DSS tests. Finally, equations to parametrize the experimental results are discussed.
AB - In particular during storm events, an accumulation of excess pore pressures may occur in the soil around cyclically loaded offshore foundations which can negatively affect the structural integrity of the foundation. As input for analytical or numerical calculation methods, high-quality laboratory test results are needed. Numerous tests are usually necessary to describe the soil behaviour over the full range of stress and strain boundary conditions. Therefore, an optimization of the test programme in terms of the number of required tests is highly desirable. In the paper, results of an extensive test programme, comprising Resonant Column (RC) and displacement-controlled cyclic Direct Simple Shear (DSS) tests on three sands are presented. Based on the findings, a shear strain threshold concept is developed in which different general soil behaviour of sands under cyclic loading is distinguished by shear strain ranges. The thresholds can be determined by RC tests and multistage cyclic DSS tests. As a main result, the soil response over the full range of possible boundary conditions can be quantified with a combination of only a few RC, multistage DSS and DSS tests. Finally, equations to parametrize the experimental results are discussed.
KW - Cyclic loading
KW - Excess pore pressure
KW - Liquefaction
KW - Shear strain thresholds
KW - Strain-controlled
UR - http://www.scopus.com/inward/record.url?scp=85144609505&partnerID=8YFLogxK
U2 - 10.1016/j.soildyn.2022.107721
DO - 10.1016/j.soildyn.2022.107721
M3 - Article
AN - SCOPUS:85144609505
VL - 165
JO - Soil Dynamics and Earthquake Engineering
JF - Soil Dynamics and Earthquake Engineering
SN - 0267-7261
M1 - 107721
ER -