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In recent years, reliance on offshore resources has increased into many folds. Due to the significant technological advancement, policymakers throughout the globe now trust the modern offshore structures built for various purposes like harnessing wind and wave energy, mining, military uses, etc. In offshore conditions, foundation requirements considerably change with the water depth. As in the deepwater floating structures are preferred, and usually, anchor systems are provided at the seabed to support the floating structures. Nowadays, for deepwater, dynamically installed anchors are gaining popularity. For the design of a dynamically installed anchor, it is essential to know the strain rate dependence behavior of soils. Usually, failure deviator stress increases with the increased strain rate. It is often found that the deepwater sediments usually are consolidated clay. The shear strength of these clay sediments is low and often less than 10 kPa. Conventional tube sampling and subsequent laboratory tests on such low strength soil are not practically possible. Therefore, field test is the only alternative that can be used to know the strength profile of deep sea soil strata. T-bar has been widely used to determine the strength profile in offshore conditions. It is more effective in the case of soft clay and silt. There has been extensive literature available on the use and interpretation of T-bar test results. However, the effectiveness of the T-bar to characterize the strain rate effect is not yet fully understood. In this research, a database was created on the T-bar test conducted at the various rate of penetration. From the database, it was observed that the penetration resistance increases with the increase in the rate of penetration. |
