Analysis Of Bonding Mechanism Of Wholly Grouted Anchor Under High Ground Temperature Environment

With the increase of the scope of human activities and the continuous improvement of social and economic levels,the construction of tunnels has continued to grow in the direction of long,large,and deep buried.Inevitably,a series of geological disasters have been encountered,among which the problem of high ground temperature is more prominent.The bolts are reliable in force and flexible in construction.They are commonly used support methods in tunnel support,and their reliability has important influence on the safety and durability of the tunnel results.The research on the bonding mechanism of the anchor system under high temperature environment will be anchorage.The technical improvement and promotion have made theoretical contributions.This paper summarizes a large number of mechanical transmission mechanisms of anchors and studies on the physical and mechanical properties of various components of anchors in high temperature environments.Based on this,through theoretical analysis,numerical analysis and other aspects of research and discussion,some meaningful Research results:1.Based on the load transfer method and the Boussinesq displacement solution in elasticity,the stress distribution functions of two kinds of full-field bonded anchor bolts were obtained.Through the force analysis and comparison,an exponential stress distribution function was recommended.It is applied to the stress distribution function of a full length cemented anchor under high temperature conditions.And discussed its stress characteristics,influencing factors,distribution rules.2.This paper summarizes several kinds of failure modes of the anchorage system,and summarizes the corresponding formulas for calculating the pullout force.Based on the derivation of the shear stress distribution function of the full-length adhesive anchor bolt derived in this paper,the formula for calculating the pull-out force when the weak surface appears at the first interface is deduced,and an example is given to show that the weak surface appears at the second interface.Pull-out force calculation formula.3.This paper introduces critical anchorage length of the anchor bolt,and deduces the calculation formula of the critical anchorage length of the anchor bolt,then gives the calculation formula of the reasonable anchorage length of the anchor bolt.4.The finite element analysis model of the anchorage system was established.Through theoretical research,analysis of indoor test results,finite element numerical analysis,a consistent conclusion was obtained,and the practicability and accuracy of the theoretical analysis results were verified.