Joints exist widely in tunnel engineering. Studying the deformation characteristics of bolted joint is beneficial for preventing rock mass disasters. To reveal joints, elastic solutions radial joints under compression-shear load were derived, which based on Lame solution mechanics and displacement coordination condition interface between bolt (assuming that at equal). Then, distance from any po...

Abstract Rock bolts are a crucial part of underground infrastructure support; however, current methods to locate and record their positions manual, time consuming generally incomplete. This paper describes an effective method automatically supporting rock from 3D laser scanned point cloud. The proposed utilises machine learning classifier combined with descriptors based on neighbourhood propert...

Due to the influence of ground stress, mining disturbance, and other factors, roadway surrounding rock in deep underground engineering such as mines, tunnels, caverns is prone looseness deformation with excavation roadways. In engineering, bolt support frequently employed stabilize rock. this work, a part anchor were taken simplified model anchorage mass, laboratory compression test was perform...

For tunnel-support engineering, the bed separation of surrounding rock has a great influence on support performance bolts. In order to reveal mechanical properties full-grouted prestressed bolt under separation, three typical working conditions single-separation, multi-separation and different positions were set up, theoretical models numerical established. Furthermore, characteristics axial fo...

In this paper, taking a typical roadway in broken and soft rock strata No. 10 Mine of Pingdingshan coal field as an example, the deformation failure mechanism mass was deeply analyzed based on testing. Then technology high-strength prestressed bolt-grouting support, such new combined grouting bolt, hollow anchor cable, were developed. Based this, repair support scheme using designed for on-site...

The secondary lining failure of deep buried soft rock tunnel often occurs, which is obviously related to the time factor. formation mechanism this phenomenon studied in paper. Therefore, combination situ stress measurement and neural network inversion used analyze distribution characteristics stress. At same time, creep surrounding are tested laboratory, key parameters obtained. Combined with r...

Design parameters such as initial bonding section, prestress, and stiffness have a significant impact on the mechanical properties of full-length bonded prestressed bolt. In order to understand influence above three axial force shear stress anchor bolts under condition rock separation, theoretical numerical models were established, sensitivity different was analyzed based grey correlation metho...

Fully grouted bolts are widely used in engineering. In order to deeply understand the load-transfer mechanism of a fully bolt, it is necessary analyze and study its mechanical behavior under axial cyclic load. First all, based on idea discretization force balance analysis each mass spring element, this proposes method for analyzing bolt—the element method. Second, model bolt established by usin...

Affected by mining stress, roadways surrounding rock face problems such as serious deformation and failure difficult support. In this study, with the II2 area rise in Taoyuan Coal Mine taken engineering background, evolution laws of plastic zone rises during advance process working were explored aid FLAC3D software. The results suggested that increase significantly when distance between track i...

This study investigates the shear capacity of aluminum alloy honeycomb sandwich plates connected by high-strength, ordinary, or self-tapping bolts. For that purpose, experimental tests and finite elements are carried out. The failure of a high-strength bolt connector is driven by bending deformations developed in the bolt that deform connection plate and pad openings. In the case of ordinary bo...