Abstract
Delayed rockburst occurs after the stress adjustment of surrounding rocks with discontinuous microseismicity, which is difficult to predict accurately. To predict and prevent the occurrence of the delayed rockbursts, study on time behavior of the surrounding rock failure and the mechanism behind the delayed rockbursts is necessary. In this article, based on the rockburst data from Jinping II Hydropower Station headrace tunnels, China, the characteristics of the delayed rockbursts are summarized. Considering the microseismic monitoring results of two typical delayed rockbursts, the formation process of delayed rockbursts is analyzed. Subsequently, the time behavior of rock failure is revealed by a uniaxial constant loading test. The results from our study suggest the surrounding rocks are in a relatively stable state, where the delayed rockburst occurs. Geo-stress, geological conditions and excavation are the key factors affecting the delayed rockbursts. Within the rockburst-affected area, the microseismic activities were frequent during the early stage of excavation, then the stress adjustment of the surrounding rocks gradually stabilized. As a result, the surrounding rocks were in a dormant stage, under the long-term high stress. Supported by laboratory experiments, our results suggest an obvious time behavior in the rock failure which corresponds to the time behavior of the crack propagation, under the high stress. Under the condition of long-term high stress, when the damage is accumulated to a certain extent, the rock mass is destabilized and then the rockburst is triggered, accordingly. The results from this study can provide a reference for the prediction and prevention of the delayed rockbursts, in similar situations, e.g. deep-buried tunnels, around the world.
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Abbreviations
- r :
-
Radius of the rupture plane
- \(v_{\text{S}}\) :
-
S-wave velocity
- \(f_{\text{S}}\) :
-
Corner frequency of the S-wave
- \(M_{0}\) :
-
Seismic moment
- μ :
-
Shear modulus of the rock mass
- \(\bar{u}\) :
-
Average slip displacement
- \(E_{\text{d}}\) :
-
Energy density
- E :
-
Seismic energy
- \(V_{\text{A}}\) :
-
Apparent volume
- \(\sigma_{\text{A}}\) :
-
Apparent stress
- \(E_{\text{S}}\) :
-
S-wave energy
- \(E_{\text{P}}\) :
-
P-wave energy
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Acknowledgements
This study was supported by the National Key Research and Development Plan (No. 2018YFC1505301), the National Key Basic Research Development Plan (973) (No. 2014CB047100), the Chinese National Natural Science Foundation (Nos. 41572249, 51627804), and the National Natural Science Foundation of Liaoning Province (No. 20180550225), which are greatly appreciated. Thanks are given to L.X. Tang for his valuable contributions to the microseismic monitoring of the Jinping II project.
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Zhang, S., Ma, T., Tang, C. et al. Microseismic Monitoring and Experimental Study on Mechanism of Delayed Rockburst in Deep-Buried Tunnels. Rock Mech Rock Eng 53, 2771–2788 (2020). https://doi.org/10.1007/s00603-020-02069-4
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DOI: https://doi.org/10.1007/s00603-020-02069-4