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Open Access Experimental study on failure behaviour of cracked rocks around tunnels under true triaxial unloading

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Rock mass contains a large number of joints and cracks,and they will expose during the process of excavations,which will affect rock structure stability.A ture triaxial unloading experirment was carried out,in order to clearly show the failure behaviour of cracked rocks.At the same time,by using a true triaxial loading and unloading equipment,a group of concrete specimens containing an inclined crack with a respective inclination angle 15°,30°,45°,60° and 75° were tested.A true triaxial experimental machine which is a computer-controlled electro-hydraulic servo machine was applied in these tests,and in order to confirm the test results,anumerical simulation by using ANSYS code was implemented.Under unloading conditions,the behaviors of stress-strain and failure of rock materials with various crack inclination angles were studied.At the same time,the drop-coefficient of brittle failure stresses was investigated.The experiment results show that a consolidation phenomenon occurs in the early stage,and the phenomenon is more obvious as the crack angle with the horizontal axis increases from 15° to 75°.For the specimen under unloading,the deformation increases as the crack angle with the horizontal axis increases.The possibility,which the damage of fall off occurs in the engineering,increases as the crack angle with the horizontal axis decreases;and the main damage of the test specimen is tensile failure;the damage characteristics,which are caused by expansion,are more obvious relative to the uniaxial compression test.The drop-coefficients of brittles stress increases as the crack angle with the horizontal axis increases.It shows that the status from brittle to ductile.
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Keywords: coefficient of brittles stress drop; cracked rocks; deformation failure; true triaxial unloading experiment

Document Type: Research Article

Publication date: February 15, 2015

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