... of excavation compensation and the requirements of traffic tunnel engineering on the anchorage system, this paper proposes a high prestressing anchorage system applicable to large deformation tunnels traversing fault fracture zones and capable of realizing the concept of timely support, and the application...

... polyester resin, J-LokP, and a specialized J-LokP pump. When used with the MPA, J-LokP is injected into the bolt through the use of a grout swivel mounted on the drill head. This allows the miner to install and anchor the bolt remotely reducing his exposure to hazards. Full anchorage of the MPA installed...

... wound around it to form a 15 mm (0.6 in) diameter cable. The capacity of which approaches 30 tons but the performance is largely dependent on the anchorage medium and the ability of the system to transfer stresses back into the rock mass while reinforcing and suspending the immediate roof. Recent...

... Upstream Oil & Gas metals & mining roof bolt plate reservoir geomechanics Rehabilitation roof surface crack support system roof deterioration drill hole deterioration Reservoir Characterization bolt system squeeze block anchorage coupler roof bolt roof support system...

... anchor length metals & mining plastic tube cartridge Thickness Fixture buttress deformation plate load resin ground load subsea system anchorage strength plastic dynamic rock anchor Anchor soft ground condition installation dyna-rok system deformation ABSTRACT...

... stress approximation hydrostatic test hydrostatic data Reservoir Characterization axial stress nonlinear elastic theory reduction Upstream Oil & Gas prediction uniaxial strain friable sandstone friable sample compressibility pore-volume compressibility anchorage moisture lateral...

... rock slope behavior. The Slope Indicator Company extensometers were of the mechanical readout type with two 1/4 in. (6 mm) diameter stainless steel rods having Figure 2 Generalized Profile of South Slope, cone shell anchorages positioned at 6 ft (2 m) showing reinforcement, and 30 ft (9 m) back from...

... resin and cement fixtures. Friction Rock Stabilizers have captured 50 per cent of the American metal market useage in just three years since their introduction. Combination bolts featuring the stiffness and hi9h anchorage of resin bolts in combination with the best of mechanical bolt active loading...

... hannibal siltstone shale Missouri characteristic Anchor grout column design value Upstream Oil & Gas inspection exposure Hannibal anchorage strength Siltstone limestone construction coating shear strength test result grout CONSTRUCTION IN THE HANNIBAL SHALE; PROBLEMS...

... interface, reduce the shear stress there, and increase the anchorage in soft rocks, still giving sufficient bolt strength. Under axial loading the bolt load decays with distance into the rock along a fully grouted bolt. A given load is distributed over a shorter distance (15 inches) in hard rock, but over...

... the Split Set is approximately equal to the insertion force. Over a period of time, the anchorage of the Split Set becomes greater due to continued lock-up of the device from ground movement, corrosion, and other factors effecting friction on the contact surface. The anchorage of the Split Set in the rock...

... into 1 3/8" diameter borehole in rock. Depending on the smoothness, diameter throughout its length, straightness of the hole and frictional coefficient, an anchorage of 3/4 to 1 1/2 tons is obtained per foot of borehole contact upon installation. A top anchor can be used if suspension of rock is desired...

... length anchor tests ranging in length from 1 m to 3 m in increments of 0.5 m. Ultimate bond failure was attributed to rock/grout bond failure. Mean stress at failure varied rom_ 5 N/n n for the lm long anchorage to 2.5N/nm for the 3m long anchorage. Corresponding tendon 2 grout mean obond stresses...

... are instrumented to determine the installed load as well as the value at any time thereafter. Without this knowledge, it is impossible to assess the efficiency. of anchorage. After installation, a bolt may have an additional load imposed upon it with subsequent movement of the roof, but if the anchorage...

... of the piece which may come against it, it must be strong enough and have sufficient anchorage to sup- port the estimated weight of the largest piece it may have to hold using a safety factor of at least a to compensate for uncertainties. SUPPORT OF UNDERGROUND OPENINGS 237 An example which comes to mind...