Geomechanical model test is an important research method to study the large underground caverns under complex conditions, this method can reflect the geological structure and powerhouse structure more truly, simulate the excavation of caverns which have influence on the stability of surrounding rock more precisely and reveal the failure characteristics of the rock. The 3D geomechanical model test of Shuangjiangkou large underground caverns is carried out. In the test, we choose the high precision FBG to measure the displacment of monitoring points and make a reservation pore and pour glue later to bury FBG. At the same time, we use the three-dimensional fast Lagrangian analysis of continua method to simulate the excavations, and make a comparison. The results show that: FBG solves the problem that the test has small deformation, but very high precision requirement. The results of the FBG agree well with numerical simulation results. In the test, it is successful to bury FBG. FGB measures the displacments of monitoring points effectively regardless of the excavation stage or the overload stage; the results reveal deformation mechanism and failure characteristics of the 3D geomechanical model.
|Number of pages||6|
|Journal||Yantu Lixue/Rock and Soil Mechanics|
|Publication status||Published - Oct 2010|
- Fiber Bragg grating(FBG)
- Geomechanical model test
- Numerical simulation
- Underground caverns