เอนกพงศ์ สงพรหม. Small Strain Behaviour of Air-Cement Treated Soil. Master's Degree(Civil Engineering). King Mongkut's University of Technology Thonburi. KMUTT Library. : King Mongkut's University of Technology Thonburi, 2011.
Abstract:
In this study, the small-strain behaviour of Air Cement treated Soil (ACS) was
investigated by laboratory uniaxial compression tests. The small-strain stress-strain
properties were evaluated by performing continuous monotonic loading (ML) and ML
tests with sustained loading (SL) and cyclic loading (CL). Relatively small vertical and
horizontal strains were locally measured by means of a pair of local deformation
transducers (LDTs) and a set of three clip gages (CGs), respectively. Therefore,
different Young's moduli and Poisson's ratios defined in this study could be accurately
determined, resulting in precise evaluation of: 1) initial, tangent, and 50 percent of
maximum stress Young's moduli(E0,Etan,E50) and Poisson's ratios(V0, Vtan),which
were evaluated from stress-strain relations at small and conventional range of strains
obtained by these ML test. 2) The equivalent Young's modulus (Eeq) and the Poisson's
ratio (Veq) , which were evaluated from the stress-stain behaviour during minute cycles
of unload and reload varying with increase in the vertical stress. In addition, the
parameter called "effective void ratio" was adopted to characterize these Moduli in
forms of empirical equations. The effective void ratio combines the influencing factors,
i.e., void ratio, cement content, and moisture content. It is shown that the effective void
ratio can appropriately characterize all Moduli evaluated in this study.