Development of CSIRO cell with the compromised application of instantaneous data-logging,no-power data-connection and twin temperature compensation techniques
LI Yuan,WANG Zhuo,QIAO Lan,CAI Meifeng,LI Qingwen
(Department of Civil Engineering,University of Science and Technology Beijing,Beijing 100083,China)
Abstract:The stability of electric circuit,the digital techniques for the improvement of complete temperature compensation method and the application of in-situ equipment under complex environment were investigated with the technique of CSIRO cell in order to meet the demand of accurate measurement and long-term monitoring of in-situ stresses. The development of the collection system with the function of instantaneous data-logging and data-connection in power cut-off condition were discussed in this paper as well. The compromised techniques of temperature self-compensation transducers and a double circuit set for temperature compensation(twin temperature compensation) are involved in the realization of complete temperature compensation in the front-end digital CSIRO cell. The test results of lab and in-situ measurement show that the twin temperature compensation technique can improve the precision of measurement to 15%(compared with the results from the original temperature compensation method). Three groups of in-situ tests were also carried out with the new digital hollow cell,and the recorded curves of strain gauges correctly indicate the defects of rock core,the tectonic disturbance,the intense influence of temperature and the process of stress release. The modified values from the twin temperature compensation calculation of the last two in-situ measurement are 64 ?? and 86 ?? respectively and the stability of the data can still meet the standard of 5 ?? in 30 minutes under the intense disturbance of temperature. The new type of digital CSIRO cell shows good accuracy and stability both in laboratory experiments and in-situ tests.
李 远,王 卓,乔 兰,蔡美峰,李庆文. 基于双温度补偿的瞬接续采型空心包体地应力测试技术研究[J]. 岩石力学与工程学报, 2017, 36(6): 1479-1487.
LI Yuan,WANG Zhuo,QIAO Lan,CAI Meifeng,LI Qingwen. Development of CSIRO cell with the compromised application of instantaneous data-logging,no-power data-connection and twin temperature compensation techniques. , 2017, 36(6): 1479-1487.
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