Safety coefficient of rock bolt selection and comparison
Safety coefficient of rock bolt selection and comparison

Safety coefficient of rock bolt selection and comparison

As supporting engineering product, rock bolt plays an important role in the safety of the project, at the beginning of the project design, the selection of rock bolt is especially important, according to the actual geological conditions and the number of years of engineering, select the appropriate safety factor is to find the balance between security and investment, following the selection of rock bolt safety principles and standards of each country making a simple comparison.

The safety factor of anti-pull rock bolt is the ratio of ultimate pullout force and tensile bolt design value (work load).The rock bolt pull-out of safety coefficient depends on the lifespan of rock bolt, conditions of use, unstable factors in the design of structure and risk; When the work stress level of anchor rod body is greater than the tensile strength of the rod body 60%, there will be a larger stress relaxation, also in the presence of high tensile strength of muscle mass caused by stress corrosion.

The pull-out safety factor of rock bolt

Country name Specification name Minimum safety facto
Temporary anchorage Permanent anchorage
China Specification for design and construction of soil anchors
CECS22:90
1.4, 1.6, 1.8 2.0
Switzerland Ground anchor
SN533-191
1.4, 1.5, 1.8 2.0
England Ground anchor development recommendations
BS1-DD81
1.4, 1.6, 2.0 2.0
America PT1 Recommendations of the prestressed soil anchor 2.0
The international association of prestressed concrete FIP Prestressed grouting anchor design and construction specifications 2.0
Japan Design and construction of soil anchor
JSF DI-88
1.5 2.5
Posted by Sinorock

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