SYMPOSIA PAPER Published: 01 January 1994
STP13211S

Feasibility of a Tool for In Situ Measurement of Material Properties of Clays Over a Wide Strain Range

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Initial feasibility findings of a research program directed toward the development of a practical tool for rapid in situ determination of material properties (modulus and damping) of soft to medium-stiff clays over a wide range of strain (0.0001% to 10%) are presented. The motivation for this work is discussed in terms of both the sensitivity of earthquake ground response analyses to input material properties, as well as the limitations of existing design methodologies for specifying material behavior. The scope and objectives of the research program are outlined. Results are presented from numerical analyses used to establish typical stress and strain fields caused by borehole installation. The merits of several tool-design alternatives are considered, and preliminary design concepts for a new tool called the “Freestanding Torsional Shear (FTS)” device are introduced. Critical issues and future directions of the research program are discussed.

Author Information

Roblee, CJ
Caltrans Office of Geotechnical Engineering, Sacramento, CA
Li, X-S
University of California at Davis, Davis, CA
Chan, CK
University of California at Berkeley, Berkeley, CA
Idriss, IM
University of California at Davis, Davis, CA
Wang, G
University of California at Davis, Davis, CA
Herrmann, LR
University of California at Davis, Davis, CA
Jackura, KA
Caltrans Office of Geotechnical Engineering, Sacramento, CA
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Details
Developed by Committee: D18
Pages: 134–161
DOI: 10.1520/STP13211S
ISBN-EB: 978-0-8031-5272-4
ISBN-13: 978-0-8031-1877-5