A primary study to damage mechanism of initial stress dynamic unloading when excavating under high geostress condition

YAN Peng; LU Wen-bo; XU Hong-tao

doi:10.11883/1001-1455(2007)03-0283-06

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YAN Peng, LU Wen-bo, XU Hong-tao. A primary study to damage mechanism of initial stress dynamic unloading when excavating under high geostress condition[J]. Explosion And Shock Waves, 2007, 27(3): 283-288. doi: 10.11883/1001-1455(2007)03-0283-06

Citation:

YAN Peng, LU Wen-bo, XU Hong-tao. A primary study to damage mechanism of initial stress dynamic unloading when excavating under high geostress condition[J]. Explosion And Shock Waves, 2007, 27(3): 283-288. doi: 10.11883/1001-1455(2007)03-0283-06

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A primary study to damage mechanism of initial stress dynamic unloading when excavating under high geostress condition

doi: 10.11883/1001-1455(2007)03-0283-06

1.
State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, Hubei, China

Publish Date: 2007-05-25

Abstract

Abstract

The dynamic unloading effect of initial stress in hydrostatic field in excavation process of circlar tunnel by blasting under high geostress condition was studied and the damage field was caculated.In the process of dynamic unloading, the radial stress unloaded first and then rebounded, the circum-stress concentrated. The unloading time affects the radial stress much more than the circum-stress.The shorter the unloading time is, the larger the influenced field is. The damage field induced by dynamic unloading is larger than that induced by static unloading.
- mechanics of explosion,
- damage mechanism,
- dynamic unloading,
- circlar tunnul,
- hydrostatic pressure field,
- initial stress,
- unloading time