Simple monitoring method for precaution of landslides watching tilting and water contents on slopes surface

This paper describes how monitoring data was used during construction to refine the design of a large span cavern built in Ashfield Shale in Sydney.The cavern is part of a rail tunnel project comprising 15.5 km of twin tunnels.The cavern is 160 m in length, with a height of up to 17 m; it spans 23 m, with a cover of between 14 and 17 m.Instrumentation used during construction comprised surface settlement survey, in-tunnel convergence using both survey and tape extensometers, borehole inclinometers, ShapeAccelArray (SAA) inclinometers, multipoint rod extensometers, wire extensometers, endoscopes and vibrating wire piezometers (VWP).Based on the observed ground conditions and monitoring during construction, it was possible to revise rock mass and in situ stress parameters to refine the design.Design changes included increases in advance distances, revised pile lengths and spacing, optimisation of the mesh reinforced arch and a revised excavation profile.These changes resulted in a significant reduction in construction time and a more economical overall project outcome.

Extensometer

Inclinometer

Vibrating wire

Instrumentation

Piezometer

Settlement (finance)

10.36487/acg_rep/1508_26_shen

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Thermal effect on tilt sensor readings in the inclinometer survey system

IOP Conference Series Earth and Environmental Science (2020)

DV Baryshnikov V. G. Kachal’sky

Abstract The change of the tilt sensor readings under temperature variation inside the probe in the inclinometer survey system is estimated by experiment. The analysis of the lab test results yields the temperature dependence of the readings on tilt angles.

Inclinometer

Tilt sensor

Variation (astronomy)

10.1088/1755-1315/523/1/012028

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