Abstract
Rocks are composed of mineral particles and micropores between mineral which has a great influence on the mechanical properties of rocks. In this paper, based on the theory of locked-in stress developed by academician Chen Zongji, the locked-in stress problem in underground rock is simulated by the thermal expansion of hard rubber particles. The pore inclusion in rock is assumed to be uniformly distributed spherical cavities. Using the thermal stress theory, the stress of rock with a spherical pore inclusion is equivalent to the thermal stress generated by the spherical hard rubber inclusion. The elastic theory formula of the temperature increment and the equivalent pore pressure of the spherical hard rubber inclusion is derived. The numerical simulation of the rock mass model with a spherical hard rubber inclusion is carried out and compared to the theoretical calculation results; the results show that they are consistent. The method proposed by this paper for simulating stress distribution in rock by thermal stress is reasonable and feasible; it has a positive meaning for further study of mechanic phenomenon of rock with micropore inclusion.
Highlights
Rocks with randomly distributed inclusions can be considered as natural composite material
In this paper, based on the theory of locked-in stress developed by academician Chen Zongji, the locked-in stress problem in underground rock is simulated by the thermal expansion of hard rubber particles
This paper considers to simulating the locked-in stress exist in rocks in the underground environment by thermal expansion stress of hard rubber particles
Summary
Rocks with randomly distributed inclusions can be considered as natural composite material. Yue-Zhongqi proposed and tried to demonstrate that the pressure and volume expansion energy of the fluid inclusions is one particular form of presence and action of locked-in stress and strain energy. After sampled from site, locked-in stress in the sample will slowly disappear due to the release of ground stress and environmental fluid (oil, water, gas) pressure. It is a problem long term concerned by scholars to simulate the locked-in stress of pores of the rock in underground environment. The results of this paper are instructive about the construction of similar material of rocks contain locked-in stress
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