Study On The Influence Of Temperature On The Mechanical Properties Of Resin Anchor

Resin bolt as the main resin bolt coal roadway supporting methods,along with the continuous development of deep mining,with the complicated geological conditions,construction process and anchoring material,in deep mine,resin bolting problems is becoming increasingly.In order to get a better understanding of the anchoring mechanism,the effects of different factors on the anchorage performance of the resin anchor and the distribution of shear stress at the interface were analyzed.This paper analysis of the anchoring mechanism,and then through the tests to study the effect of temperature on resin bolt anchoring ability characteristics,finally using Frac3D numerical simulation to simulate the mechanical behavior of different temperature process.The main research achievements in several aspects:(1)One km deep mine mudstone mechanical parameters obtained by mechanical test,then proportioning different ratio of cement-mudstone mixed specimens and the mechanical parameters were measured.The results show that when the ratio between the cement and mudstone near 1:1 and the ratio between water and ash close to 1:4,the mechanical properties of the mixed specimens are the closest to the original rocks,(2)According to the mixture ratio of the mudstone and cement,the model of bolt and anchor mixed specimen was made.Test results found that:the ratio of Anchorage strength decreases with increasing temperature is 0.74Mpa/? with 25??60? the range of temperature.the compressive strength of the anchor is the biggest,when temperature is 25? and the compressive strength of the anchor is smaller and smaller with the increase of temperature,When the temperature rises to about 45?,the decay rate of the compressive strength of the anchor becomes faster.When the temperature is 60?,the compressive strength of the anchor is 60%compare to normal temperature condition;At the same time,we also found that the peak strain of anchoring agent decreases with the increasing temperature,and the elastic modulus decreases with the increasing temperature.(3)Analysis of the data of the strain gauge on the anchor rod in the uniaxial compression test under different temperature:The shear stress on the interface of anchor bolt is non-uniform along the axial direction,the result of the anchoring specimens are tested at normal temperature shows that at the end of anchorage compression,shear stress at the anchorage interface is smaller,shear stress increases with the increase of distance from the end of the compression,the shear stress reaches the peak near the end of bolt anchorage,then shear stress decreases,the distribution of shear stress is single peak curve.With the increase of temperature,the peak value of the shear stress on the interface of the anchor rod becomes larger,the peak value of the shear stress curve is transferred to the end of compression along the axial direction of the bolt n the process of anchoring failure.(4)With the numerical simulation software FLAC3D to establish the calculation model of single bolt anchorage mechanics,the distribution characteristics of plastic zone and the plastic zone of anchor under different temperature were analyzed.