Abstract
Terzaghi's 1-D consolidation theory is commonly used for prediction of embankment settlement in soft fine-grained soil. Application of this theory is not always effective due to the simplifications of assumed soil behavior under load. This paper examines relationship between the degrees of consolidation determined by pore water pressure measured at the base of the sample and one-dimensional strain. Theoretically, this relationship should be unique, however experimental relationships correlating the degrees of consolidation are found to be non-linear. The article presents the results of multistage consolidation tests with pore water pressure measurements, carried out on intact and reconstituted deep marine clay. Consolidation tests were conducted with uniform stress distribution and single-sided drainage conditions. It was observed that the relationship between degrees of consolidation for intact and reconstituted samples largely divergent from theoretical unique line.
Highlights
The effects of load applied on saturated cohesive soil can be observed as changes in the state of stress in both solid and liquid phases in proportion to their stiffness
For well-permeable soils, the time required for the water flow and the end of the load transfer mechanism is so short that the solution to the problem is limited only to acquire the equilibrium state
For fine-grained soils, the required time become significant and it is necessary to analyse the time-dependent stress-strain behavior [1,2]. This phenomenon is known as consolidation
Summary
The effects of load applied on saturated cohesive soil can be observed as changes in the state of stress in both solid and liquid phases in proportion to their stiffness. For well-permeable soils, the time required for the water flow and the end of the load transfer mechanism is so short that the solution to the problem is limited only to acquire the equilibrium state. In this case, the problem is time-independent. For fine-grained soils (like clays), the required time become significant and it is necessary to analyse the time-dependent stress-strain behavior [1,2]. In soil mechanics, this phenomenon is known as consolidation. Presented analysis is a part of preliminary investigation of strain development during dissipation of pore pressures under one-dimensional loading
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