The main purpose of soil bolt test is to determine the pull-out ability of anchor solid in soil, so as to verify the rationality of soil bolt design and construction technology, or to check the quality of soil bolt. There are two kinds of soil bolt test: basic test and acceptance test. Creep test should also be carried out on the wrong rod in soft soil.
The soil anchorThe main purpose of the test is to determine the pull-out ability of the anchor solid in the soil, so as to verify the rationality of the design and construction technology of the soil bolt, or to check the quality of the soil bolt.
The soil anchorThere are two kinds of test: basic test and acceptance test. Creep test should also be carried out on the wrong rod in soft soil.
1.The basic test
Basic tests must be carried out for any new type of bolt, or when an existing bolt is used on an unused soil layer. This kind of test is used to determine the ultimate bearing capacity of the rock bolt and provide the basis for the design and construction of the soil layer rock bolt.
The basic test shall be carried out at the actual construction site of soil anchor rod, and the number of tests shall not be less than 3 The root.
In the basic test, the load must be added until the bolt is broken to obtain its ultimate bearing capacity.
2.Acceptance test
The bolt acceptance test is a short-term load test that applies more than the designed axial tension value to the engineering bolt. The purpose is to check whether the construction quality and bearing capacity of the bolt meet the design requirements, and find out the defects existing in the design and construction in time, so that corresponding measures can be taken to solve them in time to ensure the bolt quality and engineering safety.
The number of bolts in the acceptance test shall be the total number of bolts 5%, and not less than 3 The root.
3.Creep test
The soil anchorThe creep of is the main factor leading to the prestress loss of bolt. A lot of practice shows that saturated soft clay is very sensitive to pupal change, and the load level has obvious influence on mite change of anchor rod. Therefore, in soft clay formation, the creep characteristics of bolt design should be fully understood so as to determine the design parameters reasonably and take appropriate measures to control the creep variables.
The bolts used for creep tests shall not be less than 3 The root.
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