Coupled Seepage and Stress Model and Experiment Verification for Creep Behavior of Soft Rock
Publication: International Journal of Geomechanics
Volume 20, Issue 9
Abstract
The creep of soft rocks induced by seepage-stress coupling is one of the critical factors that causes the failure of the rock. However, the actual failure mechanisms of soft rocks, particularly during the accelerated creep stage, have not been fully understood so far. Therefore, the purpose of the present study is to develop theoretical models to quantitively investigate the effects of coupled fissure-pore seepage and hydro-mechanical coupling on the damage behavior of soft rocks. The evolution model of coupled fissure-pore seepage in soft rock was developed, and the coupled fissure-pore damage creep model of soft rock was established. The developed models were also validated by performing a series of triaxial experimental tests. The results show that the theoretical prediction agrees with the experimental results reasonably well. In addition, the developed hydro-mechanical coupled damage creep model for soft rocks can reproduce the experimentally observed deformation behavior of soft rocks in three different creep stages (i.e., deceleration creep, constant creep, and accelerated creep), respectively. Furthermore, the developed fracture evolution and pore index model have the capability of capturing the experimentally observed fracture propagation of soft rocks under hydro-mechanical conditions. The developed model could potentially be used as a useful tool for quantitatively analyzing the risks of soft rock disasters.
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Acknowledgments
This work was supported by the Key Project of National Natural Science Foundation of China (Grant No. 41530638); National Key Research and Development Project (Grant No. 2017YFC1501201); Major Project with Special Fund for Applied Science and Technology Research and Development in Guangdong Province, China: (Grant No. 2015b090925016); Special Support Program for High-Level Talents in Guangdong Province, China (Grant No. 2015TQ01Z344); Science and Technology Planning Project of Guangzhou, China (Grant No. 201803030005).
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Published In
International Journal of Geomechanics
Volume 20 • Issue 9 • September 2020
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Aug 30, 2019
Accepted: Mar 24, 2020
Published online: Jun 17, 2020
Published in print: Sep 1, 2020
Discussion open until: Nov 17, 2020
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