Abstract
The rock contains many inclusions which produce high locked-in stress under the ground stress. In order to study the influence of locked-in stress on the mechanical properties of rocks, the rock-like materials and nitrile rubber particles are used to make a test block of the rock-like model which contains inclusions. The rubber particles will expand as the test block is heated, which creates locked-in stress in the inclusions. Uniaxial compression tests of similar model blocks with different locked-in stresses and different inclusion contents were performed by using a water bath and MTS-5T uniaxial compression testing machine. The results show that the peak strength and elastic modulus decreased with the increasement of locked-in stress and inclusion content. In the meantime, the relationship among the peak strength, the elastic modulus of the test piece, the locked-in stress and the inclusion content were obtained with the help of a mathematical fitting analysis of the quantitative formula. Furthermore, the expression and value curve of the joint impact factor are calculated. This paper evaluates the importance of the locked-in stress in the mechanical properties of the rock-like material and provide a guide for other researchers to further investigate the locked-in stress in rocks.
Highlights
The rock contains many inclusions which produce high locked-in stress under the ground stress
Further researches proposes the possibility of micro-fluid inclusions which enclosed that intact rock may be in a compressed state and have a high pressure and it can cause local exceptionally high self-balancing stress field inside the rock which can be destroyed during the excavation process and resulting in the rock-burst in local surrounding r ock[9,10]
It is further demonstrated that the influence of the locked-in stress on the mechanical properties of the rock cannot be ignored for the deeply underground rocks with a small inclusion contents, which might be subjected to a large locked-in stress
Summary
For the uniaxial compression test, the sample should be waterproof and is heated in a thermostat (water bath) to the corresponding temperature of locked-in stress.
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