Abstract The overall stability of an underground cavern is determined by the stability of a key block of rock mass,
and it is critical to determine the location, size and instability mode of the key block in order to control and predict tunnel safety. The surrounding rock of the Taishan pumped storage power station underground workshop is cut by a discontinuous plane and has problems related to stability. Based on the probability characteristics of the joint crack orientation, the maximum failure mode was determined using stereographic projection; the key block positions of the workshop were determined, the long-term stability was forecasted and the quantitative index for the key block safety was given. Combining the strength reduction method with key block theory, the long-term stability and risks of the underground plant were effectively forecasted.
Abstract：
The overall stability of an underground cavern is determined by the stability of a key block of rock mass,
and it is critical to determine the location, size and instability mode of the key block in order to control and predict tunnel safety. The surrounding rock of the Taishan pumped storage power station underground workshop is cut by a discontinuous plane and has problems related to stability. Based on the probability characteristics of the joint crack orientation, the maximum failure mode was determined using stereographic projection; the key block positions of the workshop were determined, the long-term stability was forecasted and the quantitative index for the key block safety was given. Combining the strength reduction method with key block theory, the long-term stability and risks of the underground plant were effectively forecasted.
.Influence of a Random Block on the Stability of the Underground Power House of the Taishan Pumped Storage Power Plant[J] MODERN TUNNELLING TECHNOLOGY, 2017,V54(3): 97-104
2017, Vol. 54 