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On the Statistical Damage Constitutive Model and Damage Evolution of Hard Rock at High-Temperature
Abstract Geothermal resource (hot dry rock, HDR) has great potential for exploiting, the successful exploitation of HDR resource largely depends on the drilling process. Rock in high temperature environment has quite different mechanical properties from room temperature, which seriously affects the drilling process. In present study, a statistical damage constitutive model of granite at high-temperature, which considering the damage threshold, residual stress and thermal damage, is established to describe the stress–strain relationship of high-temperature granite. In this model, the Drucker–Prager criterion is used as the failure criterion and the Weibull distribution is introduced to describe the strength distribution of rock elements. The results of theoretical analysis are found agree closely with the triaxial compression experiment of high temperature granite. The influences of model parameters of m, n and temperature on rock damage evolution are analyzed. A method for evaluating rock ductile–brittle based on damage evolution is proposed. The results show that the brittleness of rock decreases with increasing the temperature, increases with increasing the parameter of m, and decreases with increasing the parameter of n. This study leads to an enhanced understanding of high-temperature rock mechanics, and provides the basis to improve the HDR resource drilling efficiency.
On the Statistical Damage Constitutive Model and Damage Evolution of Hard Rock at High-Temperature
Abstract Geothermal resource (hot dry rock, HDR) has great potential for exploiting, the successful exploitation of HDR resource largely depends on the drilling process. Rock in high temperature environment has quite different mechanical properties from room temperature, which seriously affects the drilling process. In present study, a statistical damage constitutive model of granite at high-temperature, which considering the damage threshold, residual stress and thermal damage, is established to describe the stress–strain relationship of high-temperature granite. In this model, the Drucker–Prager criterion is used as the failure criterion and the Weibull distribution is introduced to describe the strength distribution of rock elements. The results of theoretical analysis are found agree closely with the triaxial compression experiment of high temperature granite. The influences of model parameters of m, n and temperature on rock damage evolution are analyzed. A method for evaluating rock ductile–brittle based on damage evolution is proposed. The results show that the brittleness of rock decreases with increasing the temperature, increases with increasing the parameter of m, and decreases with increasing the parameter of n. This study leads to an enhanced understanding of high-temperature rock mechanics, and provides the basis to improve the HDR resource drilling efficiency.
On the Statistical Damage Constitutive Model and Damage Evolution of Hard Rock at High-Temperature
Liu, Weiji (author) / Dan, Zhaowang (author) / Jia, Yanjie (author) / Zhu, Xiaohua (author)
2020
Article (Journal)
Electronic Resource
English
BKL:
57.00$jBergbau: Allgemeines
/
38.58
Geomechanik
/
57.00
Bergbau: Allgemeines
/
56.20
Ingenieurgeologie, Bodenmechanik
/
38.58$jGeomechanik
/
56.20$jIngenieurgeologie$jBodenmechanik
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