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Materials 2012, 5(8), 1389-1403; doi:10.3390/ma5081389
Article

Time-Dependent Damage Investigation of Rock Mass in an In Situ Experimental Tunnel

* ,
 and
Received: 28 March 2012; in revised form: 7 August 2012 / Accepted: 8 August 2012 / Published: 16 August 2012
(This article belongs to the Special Issue Creep and Fracture of Engineering Materials and Structures)
Download PDF [1171 KB, uploaded 16 August 2012]
Abstract: In underground tunnels or caverns, time-dependent deformation or failure of rock mass, such as extending cracks, gradual rock falls, etc., are a costly irritant and a major safety concern if the time-dependent damage of surrounding rock is serious. To understand the damage evolution of rock mass in underground engineering, an in situ experimental testing was carried out in a large belowground tunnel with a scale of 28.5 m in width, 21 m in height and 352 m in length. The time-dependent damage of rock mass was detected in succession by an ultrasonic wave test after excavation. The testing results showed that the time-dependent damage of rock mass could last a long time, i.e., nearly 30 days. Regression analysis of damage factors defined by wave velocity, resulted in the time-dependent evolutional damage equation of rock mass, which corresponded with logarithmic format. A damage viscoelastic-plastic model was developed to describe the exposed time-dependent deterioration of rock mass by field test, such as convergence of time-dependent damage, deterioration of elastic modules and logarithmic format of damage factor. Furthermore, the remedial measures for damaged surrounding rock were discussed based on the measured results and the conception of damage compensation, which provides new clues for underground engineering design.
Keywords: time-dependent damage; rock mass; in situ experiment; time-dependent damage model; damage rehabilitation time-dependent damage; rock mass; in situ experiment; time-dependent damage model; damage rehabilitation
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Jiang, Q.; Cui, J.; Chen, J. Time-Dependent Damage Investigation of Rock Mass in an In Situ Experimental Tunnel. Materials 2012, 5, 1389-1403.

AMA Style

Jiang Q, Cui J, Chen J. Time-Dependent Damage Investigation of Rock Mass in an In Situ Experimental Tunnel. Materials. 2012; 5(8):1389-1403.

Chicago/Turabian Style

Jiang, Quan; Cui, Jie; Chen, Jing. 2012. "Time-Dependent Damage Investigation of Rock Mass in an In Situ Experimental Tunnel." Materials 5, no. 8: 1389-1403.


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