Displacement mutation characteristics and energy mechanisms of anchored jointed rock slopes under blasting excavation disturbance

YANG Jianhua; DAI Jinhao; YAO Chi; HU Yingguo; ZHANG Xiaobo; ZHOU Chuangbing

doi:10.11883/bzycj-2021-0126

Volume 42 Issue 3

Apr. 2022

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Article Navigation > Explosion And Shock Waves > 2022 > 42(3): 035201

YANG Jianhua, DAI Jinhao, YAO Chi, HU Yingguo, ZHANG Xiaobo, ZHOU Chuangbing. Displacement mutation characteristics and energy mechanisms of anchored jointed rock slopes under blasting excavation disturbance[J]. Explosion And Shock Waves, 2022, 42(3): 035201. doi: 10.11883/bzycj-2021-0126

Citation:

YANG Jianhua, DAI Jinhao, YAO Chi, HU Yingguo, ZHANG Xiaobo, ZHOU Chuangbing. Displacement mutation characteristics and energy mechanisms of anchored jointed rock slopes under blasting excavation disturbance[J]. Explosion And Shock Waves, 2022, 42(3): 035201. doi: 10.11883/bzycj-2021-0126

Citation:

YANG Jianhua, DAI Jinhao, YAO Chi, HU Yingguo, ZHANG Xiaobo, ZHOU Chuangbing. Displacement mutation characteristics and energy mechanisms of anchored jointed rock slopes under blasting excavation disturbance[J]. Explosion And Shock Waves, 2022, 42(3): 035201. doi: 10.11883/bzycj-2021-0126

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Displacement mutation characteristics and energy mechanisms of anchored jointed rock slopes under blasting excavation disturbance

doi: 10.11883/bzycj-2021-0126

1.
School of Civil Engineering and Architecture, Nanchang University, Nanchang 330031, Jiangxi, China
2.
Changjiang River Scientific Research Institute, Wuhan 430010, Hubei, China

Received Date: 2021-04-14
Rev Recd Date: 2021-11-26

Available Online: 2022-01-27

Publish Date: 2022-04-07

Abstract

Abstract

The stability of anchored jointed rock slopes under dynamic disturbance of blasting excavation is a major concern for designers and constructors. For the left-bank slope at the valley bottom of the Baihetan hydropower station, the displacement characteristics and related energy mechanism of the anchored jointed rock slope under blasting excavation disturbance were investigated. The field monitoring data of the rock mass displacement and the anchor cable axial force were first presented to show their synchronous mutation characteristics under blasting excavation disturbance. A three-dimensional numerical simulation was then conducted by using FLAC^3D to reveal the energy mechanism of the rock mass displacement mutation. The controlling effect of prestressed anchor cables on the rock mass displacement mutation was finally analyzed from the perspective of energy absorption and release. The results show that for the blasting excavation of the rock mass subjected to high in-situ stress at the valley bottom, the displacement mutation of the jointed rock slope is attributed to the rapid release of accumulated strain energy. The accumulated strain energy originates two actions, one is the blasting pressure, and the other one is the in-situ stress. The abrupt displacement of the jointed rock slope includes joint opening displacement and rock springback displacement. The total abrupt displacement will increase as the result of the in-situ stress level increases and the elastic modulus of the rock mass decreases. The prestressed anchor cable has a restraining effect on the displacement mutation of the jointed rock slope, and it mainly controls the joint opening displacement. The anchor cable with a higher prestress level corresponds to higher energy absorption and release rates, and thus has a stronger restraint on the displacement mutation of the jointed rock slope. However, when the prestress of the anchor cable is increased to a higher level, the displacement mutation of the jointed rock slope no longer decreases significantly with an increase in the prestress level.
- slope,
- jointed rock mass,
- prestressed anchor cable,
- blasting excavation,
- displacement mutation

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References

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