ISSN: 1945-7545
CODEN: GTJODJ
Published Online: 1 March 2012
Page Count: 17

Automatic Monitoring of Inserting or Retrieving SPT Sampler in Drillhole

Yang, W. W.
Dept. of Civil Engineering, The Univ. of Hong Kong, Hong Kong,

Yue, Z. Q.
Dept. of Civil Engineering, The Univ. of Hong Kong, Hong Kong,

Tham, L. G.
Dept. of Civil Engineering, The Univ. of Hong Kong, Hong Kong,

(Received 12 October 2010; accepted 18 October 2011)

Abstract

This paper presents a new device for the automatic monitoring and measurement of drill rod and sampler depth associated with conventional standard penetration testing (SPT). The device consists of a depth tip transducer and a data logger. The transducer can be firmly mounted onto the drillhole casing on the ground surface. The data logger monitors the passing of the sampler and rods through the transducer into the drillhole during rod insertion or retrieval and therefore records the tip depth in real time. The paper presents the results of calibrations and laboratory and field trials. The test results demonstrate that the device can accurately, reliably, and automatically measure the vertical displacement, velocity, and acceleration of rod insertion or retrieval in real time.

Keywords:
standard penetration test, tip depth, automation, drillhole, borehole, site investigation, management

Paper ID: GTJ103450
DOI: 10.1520/GTJ103450
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