Abstract: With the development of railway, water conservancy, mining and other projects, increasing caverns need to be excuvated in the deep. Dynaimic loads includying blasting excavation and fault-ship burst seriavsly affect the stability of surrounding rockmass of undergroud cavern. The finite difference software FLAC3D was used to simulate the surrounding rockmass stability of underground cavern under blasting and fault-slip burst conditions. The peak ground velocity(PGV)was used, and the mathematical relationship of the surrounding rock PGV under different focal mechanisms was obtained by fitting the Sadovs formula and the McGarrs formula. It was concluded that under the blasting load condition, the distance between the underground cavern and the source had a significant influence on the stability of the cavern. The Sadovs deformation formula could well characterize the PGV of the surrounding rockmass response, but the McGarrs deformation formula was not applicable. Under the condition of fault-slip, the Sadovs deformation formula and the McGarrs deformation formula did not have high goodness of fit, the slip angle had a greater influence on the stability of the cavern. Based on the above analysis, it was recommended that deep underground cavern support should consider the influence of the source, such as PGV. For the source of fault-slip, the influence of the slip angle on PGV should be considered. The above conclusions provide data support and technical basis for the excavation and support of geotechnical engineering underground cavern.
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2019, Vol. 1 
