Research on Hollow Inclusion Strain Sensors with Temperature Compensation Employed for In-situ Stress Monitor Network

Qifeng Guo (University of Science and Technology Beijing)
Fenhua Ren (University of Science and Technology Beijing)
Haoran Guo (University of Science and Technology Beijing)
Liang Zhao (University of Science and Technology Beijing)
Zhenxiong Yan (University of Science and Technology Beijing)

Indonesian Journal of Electrical Engineering and Computer Science
Vol 11, No 11: November 2013

The hollow inclusion strain sensors employed for in-situ stress monitor use strain gages to detect strain changes of the rock, and the detected strain changes are transmitted to resistance changes in a Whetstone bridge, then the output voltage values of the bridge are finally used for in-situ stress calculation. In order to correct the temperature influence on the strain gages, thermistors are used to record the temperature changes during the monitor and achieve the temperature compensation. A monitor network containing 9 hollow inclusion strain sensors with temperature compensation were built to measure the in-situ stress in an undersea mine, and the measuring results discover the distribution law of 3D in-situ stress state in the mine which can be used to optimize the mining design. DOI: http://dx.doi.org/10.11591/telkomnika.v11i11.2948