Experimental study on deformation characteristics of marine soft soil under long-term loading

Abstract

The coastal soft soil tests were carried out to determine the compressive properties of coastal soft soil under long-term load and the long-term settlement influencing factors of the construction project, so that it can provide a basis for engineering construction of the coastal soft soil area. The deformation characteristics of marine soft soil and the change rule of the secondary consolidation coefficient are discussed by carrying out the separate loading consolidation test and the graded loading consolidation test under long-term loading of marine soft soil. The results showed there are many influencing factors in the separate loading consolidation test, and separate loading consolidation test results may be biased. The results of the staged loading consolidation test are easily guaranteed, but the conclusions drawn by the two tests still show the same properties. The construction period is longer for engineering construction, and the loading speed is slow. It is more reasonable to use the staged loading consolidation test results to describe the construction process. The stress-strain relationship is approximately linear under the lower consolidation pressure, and the stress-strain relationship is approximately nonlinear under the higher consolidation pressure. As the consolidation time increases, marine soft soils are continuously compacted, and the nonlinear stress-strain relationship weakens and tends to be linear. Consolidation time, consolidation pressure and structural properties have an important influence on the secondary consolidation coefficient of marine soft soil.