Proving Ring Penetrometer for Undrained Shear Strength Determination of Soft Clay

Journal article

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Publication Details

Author list: Kitidech Santichaianant;Tawatchai Patchmai

Publication year: 2019

Journal: KMUTT Research and Development Journal (0125-278X)

Volume number: 42

Issue number: 2

Start page: 161

End page: 176

ISSN: 0125-278X

URL: https://digital.lib.kmutt.ac.th/journal/brows1.php?V_ID=37&N_ID=115

Abstract

T-bar penetration test is a globally accepted technique for determination of undrained shear strength of soft clay, both at the laboratory and field levels. However, for laboratory test, T-bar requires an expensive miniature load sensor attached to a thin pushing rod. An attempt to invent a new penetration probe, i.e., proving ring penetrometer (PRP), was therefore made; the rings with the diameters of 22.20 and 16.35 mm and with different thicknesses were fabricated. However, no prior study is yet available to clearly determine the effect of the ring size. In this study, a smaller ring of 16.35 mm in diameter was then calibrated and tested with various strengths of artificial soft clay. The normalized coefficients (N-Factor) were noted to be 8.39 and 8.08 in our previous and present studies, respectively; this represents only 3.71% difference. This implies that the probe dimensions exhibit less influence on the N-Factor. Therefore, the new proving ring penetrometer (PRP) is qualified as a low-cost option to determine shear strength of soft clay both in laboratory and for the field investigation.

Keywords

การหมุนเหวี่ยง, กำลังของดินแบบไม่ระบายน้ำ, ดินเหนียวอ่อน, ทีบาร์, วงแหวนวัดแรง, หัวกด