A HORIZONTAL INCLINOMETER FOR MEASURING GROUND MOVEMENTS

This report describes the development of a horizontal inclinometer with an inductive acceleration transducer sensing unit. The inclinometer is designed to operate in horizontal or sub-horizontal boreholes and measure vertical ground movement. Laboratory trials showed that at the 95 per cent confidence level, the instrument is capable of measuring vertical ground movements at the end of a 10 M borehole to within plus or minus 2 mm from a double run, ie measuring in and out of the borehole. Repeated measurements will improve these limits and eliminate any bias. The inclinometer was successfully used for measuring vertical ground movement around a shallow tunnel in chalk at Chinnor, Oxfordshire, where movements of up to 18 mm were recorded. /Author/TRRL/

• Corporate Authors:

  Transport and Road Research Laboratory (TRRL)

  Wokingham, Berkshire  United Kingdom 
• Authors:
  • HUDSON, J A
  • Morgan, J M
• Publication Date: 1974

Language

• English

Media Info

• Features: Figures; Photos; References;
• Pagination: 19 p.

Subject/Index Terms

• TRT Terms: Boreholes; Chalks; Costs; Electromagnetic induction; Equipment; Inclinometers; Laboratory tests; Measuring instruments; Motion; Seismicity; Sensors; Soils; Transducers; Tunnels
• Uncontrolled Terms: Vertical
• ITRD Terms: 6155: Apparatus (measuring); 5711: Bore hole; 4120: Chalk; 224: Cost; 6927: Induction; 5483: Movement; 6120: Sensor; 4156: Soil; 6140: Transducer; 3374: Tunnel; 9087: Vertical
• Subject Areas: Bridges and other structures; Construction; Finance; Geotechnology; Highways; I41: General Soil Surveys; I54: Construction of Tunnels;

Filing Info

• Accession Number: 00096025
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Report/Paper Numbers: TRRL SR 92 UC
• Files: ITRD, TRIS
• Created Date: Sep 10 1975 12:00AM