Settlement calculations in geology rely on data obtained from which laboratory test?

Settlement calculations in geology are primarily concerned with understanding how soil will behave under loading conditions, particularly how it will compress over time due to applied loads. The consolidation test is specifically designed to measure the rate and extent of settlement that occurs in saturated soils when subjected to increased load, which is essential for predicting settlement in engineering projects.

In a consolidation test, soil specimens are subjected to controlled loading conditions in a laboratory setting, allowing scientists and engineers to analyze the behavior of soil under stress. The results provide valuable data on parameters such as the compression index and the coefficient of consolidation, which are critical for calculating the expected amount of settlement over time as well as the time required for that settlement to occur.

Other tests, while important for various aspects of soil mechanics, do not directly measure the settlement characteristics of soil in the same way. For instance, the direct shear test assesses the shear strength of soil rather than its compressibility. The permeability test focuses on how easily fluids flow through soil, while the compaction test evaluates the maximum density of soil under certain moisture conditions but does not address how soil changes volume under loads. Thus, consolidation is the key laboratory test that informs settlement calculations in geology.