Hole enlarging anchorage technology of surrounding rock of roadway in weakly consolidated formation
- PDF / 963,346 Bytes
- 8 Pages / 595.276 x 790.866 pts Page_size
- 29 Downloads / 192 Views
GMGDA 2019
Hole enlarging anchorage technology of surrounding rock of roadway in weakly consolidated formation Weiguang Zhang 1,2 Received: 17 March 2019 / Accepted: 30 October 2019 # Saudi Society for Geosciences 2019
Abstract Aiming at the problem of surrounding rock deformation control of the roadway in weakly consolidated formation and combined with the calculation method of anchoring force of anchor bolt, this paper analyzes the feasibility of hole enlarging and anchoring and proposes a calculation method for the anchoring force of hole enlarging and anchoring; this paper establishes a simplified mechanics model of cylinder table enlarging, standing circular table enlarging and circular table enlarging with the method of theoretical mechanics and material mechanics and finds after analysis that the anchoring effect is best when the angle between the busbar and the axis of the circular table is θ < 45°. It draws a two-variable function relation curve for the surrounding rock stress σb and the hole enlarging parameters at the supporting region of the enlarged part of the standing circular table and obtains the optimal anchor length L is 130 mm, the optimal hole enlarging angle θ is 15°, and the optimal hole diameter D is 100 mm. It verifies the theoretical analysis results with numerical calculation, and the results show that the theoretical derivation is consistent with the simulation results. The research results make up the inadequacies of the accurate calculation method for the optimal hole enlarging parameters of the surrounding rock hole of roadway in the weakly consolidated formation, and provide a theoretical basis for the popularization and application of the anchoring technology in the roadway support of weakly consolidated formation. Keywords Weakly consolidated formation . Enlarging anchorage . Standing circular table . Bearing characteristics
Introduction Resin anchor bolt is one of the most widely used anchor bolts in the surrounding rock support of the roadway. The end anchoring is a conventional anchoring form of resin anchor bolt. Under the condition of “three-diameter matching,” the anchoring force can be improved by appropriately increasing the length of the anchoring section (Kang and Wang 2007; Ma 2011). With the increase of coal mining depth, the strength of the surrounding rock of the roadway is reduced and the pressure is increased. The effect of this method in the soft rock This article is part of the Topical Collection on Geological Modeling and Geospatial Data Analysis * Weiguang Zhang [email protected] 1
State Key Laboratory of Coal Resources and Mine Safety, China University of Mining & Technology, Xuzhou 221116, China
2
Xingjiang Institute of Engineering, Mining Engineering and Geology College, Wulumuqi 830091, China
support of the roadway is not very satisfactory; if the fulllength anchored rebar anchor bolts are used in a wide range, the cost of surrounding rock support of the roadway will certainly be increased, which is in contradiction with the current unsatisfactory
Data Loading...
