Effect of sampling disturbance on laboratory-measured soil properties
Gilbert, P. A.
Miscellaneous PaperAbstract: Soil properties must be accurately determined for reliable and economical design of geotechnical structures. Typically, "undisturbed" soil samples are taken from a prospective foundation and brought to the laboratory where the "in situ" properties of interest are measured . However, laboratory-determined properties are impacted by the amount and kind of disturbance which occurs during sampling. Design of foundations and soil structures based on properties different from true in situ properties could result in structures with performance and maintenance problems, or unnecessarily expensive structures if designs are made very conservative to compensate for sampling disturbance. This report discusses some of the causes of sampling disturbance, how various investigators have analyzed mechanisms causing disturbance, and how equipment design and sampling techniques have been modified to minimize disturbance. The effect of sampling disturbance on various soil properties (strength, Young's modulus, compressibility, permeability) is discussed along with laboratory techniques for minimizing the effects of sampling disturbance. Severity of sampling disturbance as the result of (A.) release of hydraulic and earth pressure, (B.) compression, shear, and tension during sampling, (C.) mechanical shock and temperature change during storage, and (D.) compression and shear during extraction and specimen preparation in the laboratory are discussed.
Geotechnical Laboratory (U.S.)Engineer Research and Development Center (U.S.)
Area ratio; Compressibility; Inside clearance ratio; Laboratory testing; Perfect sampling; Permeability; Sampling disturbance; Shear strength; Thin walled sampling tube; Soil sampling; Soil testing; Soil mechanics
Miscellaneous paper (U.S. Army Engineer Waterways Experiment Station) ; GL-92-35.
Approved for public release; distribution is unlimited.
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