Graphical and Numerical Methods for Stability Analysis in Surrounding Rock of Underground Excavations, Example of Boukhadra Iron Mine N.E Algeria

The initial stress of rock is a basic parameter, which can be used for surrounding rock stability analysis, exploitation and support design. By utilizing stress relief method of hollow inclusion with its characters of high precision and obtaining three dimensional stress at one time, we have measured three dimensional stress magnitude and direction in north wing roadway (-850m) and 710 open-off cut (-1000m), respectively. The results show that the horizontal tectonic stress is obvious in this coal area.

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Dynamic Monitoring and Stability Analysis of Rock-bolted Crane Girder In large Cavern With Layered Surrounding Rock

E3S Web of Conferences ◽

10.1051/e3sconf/202016503025 ◽

2020 ◽

Vol 165 ◽

pp. 03025

Author(s):

Jing Liu ◽

Xiaomin Liu ◽

Shengjie Di ◽

Xi Lu

Keyword(s):

Stability Analysis ◽

Stability Condition ◽

Stress Condition ◽

Surrounding Rock ◽

Monitoring Data ◽

Dynamic Monitoring ◽

Power Station ◽

Load Bearing ◽

Underground Cavern ◽

Normal Law

The large and medium-sized hydropower projects underground cavern group are basically in relatively integrate surrounding rock, so there are few engineering examples in layered surrounding rock with type III surrounding rocks as the main rock, and lack of successful experience. According to rock-bolted crane girder under the layered surrounding rock of a large underground power station, analyzing prototype dynamic monitoring data of the excavation, unloading and load-bearing test .The distribution of the monitoring data conforms to the normal law, and there are no large outliers, under the action of a large number of bolts, rock-bolted crane girder basically forms a good integrity with the layered surrounding rock, and the load-bearing test has no effect on the stress condition and stability condition of surrounding rock.

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Stability Analysis of Tunnel Surrounding Rock Based on Coupled Fluid-Solid Theory

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.90-93.1900 ◽

2011 ◽

Vol 90-93 ◽

pp. 1900-1903

Author(s):

Fu Ming Wang ◽

Xiao Long Li ◽

Yan Hui Zhong ◽

Xiao Guang Chen

Keyword(s):

Stability Analysis ◽

Plastic Zone ◽

Coupling Effect ◽

Plastic Zone Size ◽

Wall Rock ◽

Surrounding Rock ◽

Maximum Deformation ◽

Calculation Results ◽

The Stability ◽

Tunnel Depth

Taking Chaijiazhuang Tunnel of Lingnan Expressway as project background, the stability analysis of surrounding rock was performed based on the coupled fluid-solid theory. The distributions of stress field, displacement field and plastic zone of rock mass after excavation of tunnel were discussed considering coupled effect between flow and stress under the condition of different rock level and tunnel depth. Compared with the calculation results of not considering coupling effect, the maximum deformation, maximum principle stress and plastic zone size of wall rock were obviously increased when considering coupling effect, which showed a remarkable influence of coupled fluid-solid effect on the stability of tunnel surrounding rock. Some conclusions were drawn and may provide some guidance to the design and construction of tunnels in water-rich strata.

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