Study On Anchorage Mechanism And Reasonable Anchorage Depth Of Grouting Bolt In Rock Slope

Bolt support is one of the most effective means to improve the stability of geotechnical engineering and solve complex geotechnical engineering problems.The anchoring system tightly connects the bolt and the rock and soil body.Through the coupling between the two,the rock Reinforce the soil.A correct understanding of the anchoring mechanism of the anchor rod is the basis of a reasonable engineering design.In order to reveal the transmission mechanism of the anchor rod to the axial tensile load in depth.In this paper,the mechanism of anchorage,the distribution mode of friction stress and the reasonable anchorage depth are studied.The main research work and results are as follows:(1)Aiming at the rock slope,the basic principle of the anchoring effect of the bolt on the slope is expounded,and the four main failure modes of the anchoring system are summarized and analyzed,and their sensitivity is ranked.(2)Based on the general expression of shear stress of Mindlin solution,the boundary conditions of the front and rear end of the anchorage section and the static equilibrium conditions of the anchorage section are modified,and the calculation expression of the side surface shear stress of the anchorage section is obtained.(3)Based on Mindlin's displacement solution,the calculation expression of the surface shear stress of the anchorage section is obt ained on the premise of considering the shear dislocation,and the distribution mode of the surface shear stress of the anchorage sectio n is obtained by combining with the case analysis.Then,according to the maximum shear stress control method,the determination me thod of the reasonable length of the anchorage section is given.(4)The shear stress distribution patterns of the anchoring section of the bolts obtained by the two methods proposed in this paper are all single-peak curves with initial values greater than zero.(5)In this paper,FLAC3 D software is used to simulate and analyze the rock slope bolt,and the results are compared with the theoretical method.