Simulated experiment of disturbance effect on crack defects
of adjacent tunnel under dynamic and static load

Guo Dongming; Liu Kang; Yang Renshu; Ji Changmin; Zhang Xuecheng

doi:10.11883/1001-1455(2016)03-0297-08

Volume 36 Issue 3

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Guo Dongming, Liu Kang, Yang Renshu, Ji Changmin, Zhang Xuecheng. Simulated experiment of disturbance effect on crack defectsof adjacent tunnel under dynamic and static load[J]. Explosion And Shock Waves, 2016, 36(3): 297-304. doi: 10.11883/1001-1455(2016)03-0297-08

Citation:

Guo Dongming, Liu Kang, Yang Renshu, Ji Changmin, Zhang Xuecheng. Simulated experiment of disturbance effect on crack defects of adjacent tunnel under dynamic and static load[J]. Explosion And Shock Waves, 2016, 36(3): 297-304. doi: 10.11883/1001-1455(2016)03-0297-08

Citation:

Guo Dongming, Liu Kang, Yang Renshu, Ji Changmin, Zhang Xuecheng. Simulated experiment of disturbance effect on crack defects of adjacent tunnel under dynamic and static load[J]. Explosion And Shock Waves, 2016, 36(3): 297-304. doi: 10.11883/1001-1455(2016)03-0297-08

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Simulated experiment of disturbance effect on crack defects of adjacent tunnel under dynamic and static load

doi: 10.11883/1001-1455(2016)03-0297-08

1.
State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining & Technology, Beijing 100083, China
2.
School of Mechanic & Civil Engineering, China University of Mining & Technology, Beijing 100083, China

Received Date: 2014-06-27
Rev Recd Date: 2014-11-16
Publish Date: 2016-05-25

Abstract

Abstract

To explore the mechanism of crack expansion in the adjacent tunnel under the influence of the combined stress field, a simulated experiment was carried out adopting the blast loading and static loading transmission of the dynamic caustics, and the result was analyzed combined with dynamic stress intensity factors and the energy release rate of the crack tip. The experimental results show that the region where cracks are located in the back-blast side of the adjacent model-tunnel is also the main disturbance zone of the tunnel and that the explosion load plays a leading role in inducing crack initiation in the combined stress field formed by the less vertical pressure and the explosion load. In the same combined stress field, with p=0.2 MPa, the prefabricated crack extension displacement is associated with the angle of the crack and, with θ=75°, the explosive stress wave cannot induce crack initiation. Under the effect of the same explosive stress wave, with θ=30°, the less vertical stress within a certain range has an inhibitory effect on the propagation of the crack, and this effect increases with the vertical pressure increase applied in the neighboring roadway. With p=0.4 MPa, the crack cannot induce crack initiation. Eventually the displacement of an extended crack occurred, which is positively correlated with the duration time of the dynamic stress intensity factor around its maximal value or with the accumulated value of the energy release rate in the stage of the crack propagation. The results of the present study will have a guiding significance for practical engineering in mining industry.
- solid mechanics,
- crack defects,
- dynamic and static load,
- adjacent tunnel,
- dynamic stress intensity factor,
- energy release rate

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References(19)

References

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