Scholarly record

TELEMETRY MEASUREMENTS OF SHAFT TUBE INFLUENCED BY SEALING OF THE HOUSING

MSc Eng Mateusz Jablonski, Dr. Wojciech Jaskowski, Dr. Tomasz Lipecki

Abstract

The paper presents deformation of the housing and shaft reinforcement surveyed within the telemetry deformation monitoring system. Research was taken in the Salt Mine Wieliczka Museum, one of the most popular monuments in Poland, placed in 1978 on the original UNESCO list of the World Heritage Sites. Water leaking into Ko?ciuszko shaft posed a serious threat to museum and forced authorities to seal the housing with Jet-grouting method. Due to boreholes which were designed very close to the shaft, the material injected under considerable pressure could damage the reinforcement and cause critical failures of the shaft. In order to prevent such situations, mobile system for continuous monitoring of the shaftпїЅs structure condition was constructed. Its indications allowed to define the value of temporary changes occurring in the shaft, depending on the pressure, depth or speed of the injection. Operator could modify the course and range of injection works thanks to the chart and numerous data delivered by the system at the present time. Analysis of received results shows a slight deformation of the shaft housing during the injection, both in periods and total. It also demonstrates the advantages of the continuous monitoring system based on extensometers and a novel method of high-pressure injections.

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