... ABSTRACT: Underground mine pillars are typically supported using rockbolts, wire mesh, shotcrete liners, or a combination of these methods to enhance stability and maintain their load-bearing capacity. The design of these supports is generally based on field experience, which is often site...

... ABSTRACT: In modern numerical modelling software, several rockbolt models are available to practitioners for the design of tendon rock support in underground excavations. In this research, two applicable rockbolt models for the modelling of grouted rebar rockbolts are implemented in the 2D...

..., followed by analyzing the influence of rockbolt patterns in these models. Model outputs like stress-strain behavior, block and joint yield, and failure patterns were analyzed. With this, differences and similarities in the behavior of the two model variants have been discussed, considering...

... coal mining fuzzy logic metals & mining fis grouted rockbolt rock type shale rockbolt tunnel intersection expert system machine learning fog size excavation intersection adoko support type membership function organic-rich rock asia government artificial intelligence intersection...

... ABSTRACT A typical ground support system designed to safely excavate mine openings in rock consist of rockbolts, rockbolt plates, steel mesh, structural support lines, and shotcrete. The rockbolt plate, which connects the embedded rockbolt to the surface support, is a crucial part of a ground...

... ABSTRACT: Rockbolts/rock anchors are one of primary reinforcement/support members and utilized widely in both civil engineering and mining engineering. They are generally fixed into rock mass through boreholes utilizing cement or resin-based bonding material. Therefore, their bonding strength...

... Upstream Oil & Gas Artificial Intelligence US government seismic wave Reservoir Characterization frequency mechanism Surface Support unsupported excavation rockburst dynamic loading ejection fracture Magnitude seismic loading rockbolt excavation Ground Support ground support system...

... of construction works on the strength and stiffness of karst, and a more reliable estimate of long-term deformation of geotechnical structures carried out in karst. structural geology self-drilling rockbolt deformation modulus carbonate rock mass Reservoir Characterization Engineering Longitudinal...

... ABSTRACT This paper deals with fully grouted rockbolts, both for mining and civil engineering applications. Their mechanical behavior under tensile loads is reviewed theoretically and experimentally. As for the theoretical part, a new solution able to predict the full range behavior...

... rock bolts and hard rock masses subjected to changes in stresses induced by mining. During the test a large rock wedge was observed in the footwall side of the drift. Borehole extensometers, distometers, telescopic tube extensometers and rockbolts with strain gauges recorded the movement of the rock...

... with associated underground merges at Shafston Avenue south of the river totaling approximately 1350 m in length. The overall layout of the tunnel is shown on Figure 1. reservoir geomechanics shafston avenue roadheader span Ramp rockbolt shotcrete Upstream Oil & Gas long rockbolt intersection...

... Abstract Stress corrosion cracking (SCC) has been reported to be a significant cause of premature failure of rockbolts in Australian coal mines [1]. At some mine sites, failure of rockbolts due to SCC has occurred well within the twelve to eighteen month design life of longwall gateroads...

... is 845.5m. Fig. 3 shows the earth pressure balance type shield TBM. The structures of tunnel include two ventilating openings and two shelter connection pits. Reservoir Characterization structural geology Upstream Oil & Gas Korea swellex rockbolt weak zone coal layer directional core...

... ABSTRACT: In tunnel excavation methods that use rock as main suppol1, shotcrete and rockbolt are installed to help the formation of ground arch region as a primary reinforcement. For the evaluation of tunnel stability in hardrock, the ground displacements, convergence and the internal forces...

... of several composite bolts. Weldgrip bolts showed significant potential with respect to support capacity and cost, hence, a detailed analysis was carried out on it. Reservoir Characterization metals & mining Upstream Oil & Gas resin Weldgrip rockbolt shear rockbolt Weldgrip bolt...

... to the Mohr-Coulomb's criterion including cohesive force. Damping coefficient was implemented to take into account the block collision. The rockbolt element was introduced to represent the effect of confinement for rock masses. The bonding element which fuses two blocks was also invented to represent...

... the rock structures, and rockbolt is often installed to reinforce the rock mass. Precise analysis for the mechanisms of rockbolt reinforcement and the behaviors of reinforced rock mass is very significant for the safe design of rock structures. St. John and Van Dillen [ 1] devised a three dimensional...

... ABSTRACT: In recent years, more and more applications of underground support by rockbolting and shotcreting have been found in the tunnels in soft rocks. However it has been noticed in practice that the effectiveness of rockbolting and shotcreting is not satisfactory in rock subject to large...

... ABSTRACT ABSTRACT, The necessity of using tensible rockbolt in the roadway with soft rock, high in-situ stresses, mining influence and other complex conditions was discussed, the structures of three kinds of tensible rockbolt and design principle were introduced in this paper. The tests...

... ABSTRACT ABSTRACT: A new loading frame constructed at the U.S. Army Engineer Waterways Experiment Station, provides a unique capability for subjecting large blocks of material to true triaxial states of stress. A series of tests of model rockbolted tunnel sections was conducted in a rock...