Yimin Liu, Z. Hou, Hao Zhou, G. Gao, Lun Yang, Pu Wang, Peng Wang
{"title":"光纤光栅传感器组用于三维地应力测量的研究","authors":"Yimin Liu, Z. Hou, Hao Zhou, G. Gao, Lun Yang, Pu Wang, Peng Wang","doi":"10.5194/gi-11-59-2022","DOIUrl":null,"url":null,"abstract":"Abstract. The observation and estimation of the deep crustal stress\nstate is a key and difficult problem for in situ stress measurement. Using a\nborehole wall strain gauge based on the overcoring stress-relieving method\nis one of the main methods of in situ stress measurement. In this paper, a\nstrain-sensing array based on fiber Bragg grating (FBG) is designed by using the main structure of\nthe classical hollow inclusion cell, and its layout scheme on the hollow\ninclusion is studied. According to the layout scheme, the in situ stress\ninversion algorithm of hole wall strain to stress is deduced. Following this, the\ntriaxial loading and unloading experiment platform is built, and the\ncalibration experiment for the FBG strain sensor is designed. Finally, Abaqus\nfinite element software is used to simulate the in situ stress measurement\nprocess of the overcoring stress relief. The FBG strain values of each\nmeasurement direction before and after the overcoring process are extracted,\nand the stress inversion equation is used to carry out the stress inversion.\nThe comparison of the inversion results proved that the FBG strain sensor\ngroup is feasible and reliable. The quasi-distributed FBG sensor module\ndesigned in this paper can invert the three-dimensional in situ stress by\nmeasuring the hole wall strain, which places a theoretical and experimental\nfoundation for the development and application of an FBG hole wall strain\ngauge. It makes up for the deficiency of the existing hole wall\nstrain gauge based on a resistance strain gauge, provides direct and accurate\nobservations for hole wall strain measurement, and has important\npractical value for the development of in situ stress measurement\ntechnology.\n","PeriodicalId":48742,"journal":{"name":"Geoscientific Instrumentation Methods and Data Systems","volume":null,"pages":null},"PeriodicalIF":1.8000,"publicationDate":"2022-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":"{\"title\":\"Research into using a fiber Bragg grating sensor group for three-dimensional in situ stress measurement\",\"authors\":\"Yimin Liu, Z. Hou, Hao Zhou, G. Gao, Lun Yang, Pu Wang, Peng Wang\",\"doi\":\"10.5194/gi-11-59-2022\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Abstract. The observation and estimation of the deep crustal stress\\nstate is a key and difficult problem for in situ stress measurement. Using a\\nborehole wall strain gauge based on the overcoring stress-relieving method\\nis one of the main methods of in situ stress measurement. In this paper, a\\nstrain-sensing array based on fiber Bragg grating (FBG) is designed by using the main structure of\\nthe classical hollow inclusion cell, and its layout scheme on the hollow\\ninclusion is studied. According to the layout scheme, the in situ stress\\ninversion algorithm of hole wall strain to stress is deduced. Following this, the\\ntriaxial loading and unloading experiment platform is built, and the\\ncalibration experiment for the FBG strain sensor is designed. Finally, Abaqus\\nfinite element software is used to simulate the in situ stress measurement\\nprocess of the overcoring stress relief. The FBG strain values of each\\nmeasurement direction before and after the overcoring process are extracted,\\nand the stress inversion equation is used to carry out the stress inversion.\\nThe comparison of the inversion results proved that the FBG strain sensor\\ngroup is feasible and reliable. The quasi-distributed FBG sensor module\\ndesigned in this paper can invert the three-dimensional in situ stress by\\nmeasuring the hole wall strain, which places a theoretical and experimental\\nfoundation for the development and application of an FBG hole wall strain\\ngauge. It makes up for the deficiency of the existing hole wall\\nstrain gauge based on a resistance strain gauge, provides direct and accurate\\nobservations for hole wall strain measurement, and has important\\npractical value for the development of in situ stress measurement\\ntechnology.\\n\",\"PeriodicalId\":48742,\"journal\":{\"name\":\"Geoscientific Instrumentation Methods and Data Systems\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":1.8000,\"publicationDate\":\"2022-02-07\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"1\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Geoscientific Instrumentation Methods and Data Systems\",\"FirstCategoryId\":\"89\",\"ListUrlMain\":\"https://doi.org/10.5194/gi-11-59-2022\",\"RegionNum\":4,\"RegionCategory\":\"地球科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"GEOSCIENCES, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Geoscientific Instrumentation Methods and Data Systems","FirstCategoryId":"89","ListUrlMain":"https://doi.org/10.5194/gi-11-59-2022","RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"GEOSCIENCES, MULTIDISCIPLINARY","Score":null,"Total":0}
Research into using a fiber Bragg grating sensor group for three-dimensional in situ stress measurement
Abstract. The observation and estimation of the deep crustal stress
state is a key and difficult problem for in situ stress measurement. Using a
borehole wall strain gauge based on the overcoring stress-relieving method
is one of the main methods of in situ stress measurement. In this paper, a
strain-sensing array based on fiber Bragg grating (FBG) is designed by using the main structure of
the classical hollow inclusion cell, and its layout scheme on the hollow
inclusion is studied. According to the layout scheme, the in situ stress
inversion algorithm of hole wall strain to stress is deduced. Following this, the
triaxial loading and unloading experiment platform is built, and the
calibration experiment for the FBG strain sensor is designed. Finally, Abaqus
finite element software is used to simulate the in situ stress measurement
process of the overcoring stress relief. The FBG strain values of each
measurement direction before and after the overcoring process are extracted,
and the stress inversion equation is used to carry out the stress inversion.
The comparison of the inversion results proved that the FBG strain sensor
group is feasible and reliable. The quasi-distributed FBG sensor module
designed in this paper can invert the three-dimensional in situ stress by
measuring the hole wall strain, which places a theoretical and experimental
foundation for the development and application of an FBG hole wall strain
gauge. It makes up for the deficiency of the existing hole wall
strain gauge based on a resistance strain gauge, provides direct and accurate
observations for hole wall strain measurement, and has important
practical value for the development of in situ stress measurement
technology.
期刊介绍:
Geoscientific Instrumentation, Methods and Data Systems (GI) is an open-access interdisciplinary electronic journal for swift publication of original articles and short communications in the area of geoscientific instruments. It covers three main areas: (i) atmospheric and geospace sciences, (ii) earth science, and (iii) ocean science. A unique feature of the journal is the emphasis on synergy between science and technology that facilitates advances in GI. These advances include but are not limited to the following:
concepts, design, and description of instrumentation and data systems;
retrieval techniques of scientific products from measurements;
calibration and data quality assessment;
uncertainty in measurements;
newly developed and planned research platforms and community instrumentation capabilities;
major national and international field campaigns and observational research programs;
new observational strategies to address societal needs in areas such as monitoring climate change and preventing natural disasters;
networking of instruments for enhancing high temporal and spatial resolution of observations.
GI has an innovative two-stage publication process involving the scientific discussion forum Geoscientific Instrumentation, Methods and Data Systems Discussions (GID), which has been designed to do the following:
foster scientific discussion;
maximize the effectiveness and transparency of scientific quality assurance;
enable rapid publication;
make scientific publications freely accessible.