title: Anchorage performance of a high-pressure pre-tightening resin anchor with a compressed grouting body.
abstract: Supports for deep mine roadways located in soft surrounding rock face several problems: difficulty in applying pre-tightening force, low bearing capacity, and poor initial support. To solve these problems, this study proposes a high-pressure pre-tightening resin anchor with a compressed grouting body for use in soft and fractured rock surrounding a deep roadway. Using model experiments, we analyzed the anchorage performance of the proposed anchor and a conventional tensile-type anchor for three different values of the elastic modulus of the surrounding rock. The results showed that regardless of the surrounding rock type, the peak micro-strain (642-541) and displacement (6.09-6.5 mm) at the pull-out end of the proposed anchor were always smaller than the peak micro-strain (1433-1105) and displacement (8.77-9.2 mm) at the pull-out end of the conventional anchor. Furthermore, as the anchor's pre-tightening force increased from 20 kN to 120 kN, the anchor's strain remained concentrated over a length of 0.4 m from the bearing end. Compared with conventional tensile-type anchors, the proposed high-pressure pre-tightening resin anchor with a compressed grouting body has a higher ultimate bearing capacity, allows the grouting length to be decreased to 0.4 m, and provides initial support resistance.
authors.affiliation: School of Mechanics & Civil Engineering, China University of Mining and Technology, Xuzhou, China.
authors.forename: Jiansheng
authors.initials: J
authors.lastname: Tian
authors.affiliation: PowerChina Roadbridge Group Co., Ltd., Beijing, China.
authors.forename: Li
authors.initials: L
authors.lastname: Hu
mesh_terms: D003032:Coal Mining; D055119:Elastic Modulus; D006801:Humans; D008422:Materials Testing / Q000379:methods; D055595:Mechanical Phenomena; D011312:Pressure; D012117:Resins, Synthetic; D013718:Tensile Strength
chemical_list: D012117:Resins, Synthetic