How to calculate the cohesive force of anchor rod

1. The bearing capacity of the anchorage section is the bearing capacity of the anchor rod, and the minimum values of the tensile strength of the anchor rod, the bond strength between the rod and the anchorage mortar, and the bond strength between the anchor solid and the soil layer are taken

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2.

According to the design requirements, if there are no design requirements, the ultimate tensile force of the bolt body (reinforcement) is used for destructive testing. For the full-length adhesive bolt, that is, the full-length grouting, the cohesive force is far greater than the rod body, that is, the rod body breaking is the ultimate tensile pull-out force

When one of the following conditions occurs, the pull-up test can be terminated:

1

The newly added pull-up force could not be applied or could not keep stable after being applied

3. The reinforcement of the bolt has been pulled out, or the reinforcement of the bolt has been pulled out

extended data:

when the range of the test bolt participating in the statistics does not exceed 30% of the average value, the average value can be taken as the ultimate bearing capacity of the bolt. When the range exceeds 30% of the average value, the test quantity should be increased and the reasons for the large deviation should be analyzed to determine the ultimate bearing capacity in combination with the engineering situation

The characteristic value of pullout bearing capacity RT is divided by safety factor 2.

when drilling, the rock core should be processed into standard specimens, and the uniaxial compression test of rock should be carried out under the condition of natural humidity. The number of samples for each test bolt should not be less than 3

after the end of the test, it is necessary to make a detailed description and take photos of the failure of the anchor test site

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6. It should be cement mortar anchor rod 7d, chemical 3 hours can do

7.

bus line: No.11, the whole journey is about 12.2km

1. Walk about 540 meters from Zhangjiakou South Railway Station to Zhangjiakou South Railway Station

2. Take No.11, pass 22 stations, and reach the Vocational Ecation Center Station

3. Walk about 520 meters to Zhangjiakou Vocational and technical ecation center

8. Not good

if local people look at it, it's not good

but some outsiders think it's good

mostly rural people and outsiders