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| BACK ANALYSIS OF STRUCTURAL LOADS AND DEFORMATION CHARACTERISTICS OF ERGUXI TUNNEL #1 AT SHIZIPING HYDROPOWER STATION |
| ZHANG Shishu1，2，PEI Xiangjun3，WEI Xiaojia3，YU Ting2，FENG Jianming2，RAN Congyan2，LI Changyou2 |
(1. State Key Laboratory of Hydraulics and Mountain River Development and Protection，Sichuan University，Chengdu，Sichuan 610065，China；2. PowerChina Chengdu Engineering Corporation Limited，Chengdu，Sichuan 610072，China；
3. State Key Laboratory of Geohazard Prevention and Geoenironment Protection，Chengdu University of Technology，
Chengdu，Sichuan 610059，China) |
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Abstract During“5•12”Wenchuan earthquake，the strong ground motion caused Erguxi tunnel #1 to deform and crack. Under the influences of the aftershocks，the precipitation and the impounding of reservoir etc，the creep rate of the slope gradually increases resulting large deformation of slope and squeezing the Erguxi tunnel #1 to be damaged severely. 3D laser scanning technology was used to obtain the surface image of the tunnels and the tunnel deformation was calculated with the acquired optical results. The maximum extrusion was found to be 1.08 m. The finite element software ANSYS was used to back analyze the structural loads. The element discretization of the lining structure was achieved through the load-structure discrete method with a spring to represent the constraint of rock. Repeated iterations were carried out to get the structural load of the slope on the deep lining to be around：F = 16 807–23 737 kN. A suitable treatment program for the tunnel was put forward based on the value of the load on the structure.
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Received: 18 June 2014
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2014, Vol. 33 
