AN INVESTIGATION INTO SHEAR STRESS DISTRIBUTION AROUND HOLLOW GROUTING ANCHOR CABLES
LI Guichen1，2，3，SUN Hui1，2，ZHANG Nong1，2，WEI Yinghao1，2，ZHANG Lei1，2
(1. School of Mines，China University of Mining and Technology，Xuzhou，Jiangsu 221116，China；2. Key Laboratory of Deep Coal Resources Mining，Ministry of Education，China University of Mining and Technology，Xuzhou，Jiangsu 221116，China； 3. Post-doctoral Research Station，Huaibei Coal Mining Limited Company，Huaibei，Anhui 235000，China)
Abstract：Hollow grouting anchor cables(HGAC) integrates tail resin anchorage and full-size grouting anchorage. The shear stress between anchor agent and borehole surface in HGAC possesses distinct pattern compared with that of traditional tension concentrated anchor cables. By simplifying the mechanical model around the grouts and using the analytical solutions of Kelvin problem and Boussinesq problem，theoretical formulas of shear stress of the grouts between anchor agent and borehole surface was derived based on the theory of elasticity. FLAC3D was also used to simulate shear stress distribution around anchor cables pre- and post- grouting. The results showed that the shear stress curve present bimodal distribution along the axial direction of anchor cable. Drawing force has limited effect on the shear stress distribution of the cable tail part. It has been found that shear stress and its concentration of the end anchored segment and the grouting anchored segment were respectively proportional to the pretightening force and the drawing force，while the shear stress and its concentration of the whole anchor cable was inversely proportional to the pore diameter within certain ranges.
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2014, Vol. 33 
