... Abstract Researchers from the National Institute for Occupational Safety and Health (NIOSH) Spokane Mining Research Division (SMRD) are evaluating the comparative performances of shotcrete support systems currently utilized in underground metal mining. The SMRD Metal Ground Control Team...

... Abstract With advances in fiber technology, shotcrete has become an essential support in the underground structures. The rock-shotcrete (R-S) interface plays a key role in determining the distribution of in-situ loads. This interface behavior is quite complex in reality and the interaction...

... in the country for decade. highway section Management Practice gabion wall ground transportation divert surface water away slope stabilization Nepal rock block structural geology november 2018 shotcrete highway Reservoir Characterization Wiremesh isrm international symposium asian rock...

... if there is data available for meaningful comparison between TSL mechanical properties to its nearest counterpart, in this case shotcrete. This paper provides the details of tensile strength testing done on TSLs and shotcrete from sample preparation to test execution and summarizes the test results. The comparison...

... Reservoir Characterization support structure Sapporo excavation deformation shotcrete ujigawa tunnel 8th Asian Rock Mechanics Symposium ARMS8 14-16 October 2014, Sapporo, Japan Analytical and Measured Behavior of Tunnel Deformation in Althred Autobrecciated Lave Ground Takashi Sasakia, Akira...

... shaft was excavated and supported with steel rings, columns and additional shotcrete in order to reduce the influence of four openings at the shaft and neighboring tunnels excavation. Prior to the east shaft excavation, the tunnels were excavated and supported by reinforced-concrete primary lining...

... support by consultant engineers was challenged. According to the numerical stability analysis and monitoring of tunnels during excavation, it was observed that the four meters long rockbolts with twenty centimeter of shotcrete cover and lattice girders should be replaced with slightly light support...

... systems. The temporary support system for section I consists of three bars lattice girders embedded in a 15 cm shotcrete layer and two wire mesh φ8 and for section II consists of 5 cm shotcrete layer with wire mesh φ8 and rock bolts. Also the permanent support system for sections I and II consists of 30...

... pressure instead of shotcrete. Lackings of concrete can be removed by using polymer materials. If polymer support's stiffness is very few for some tunnelling zone, fiber glass or carbon fiber can be used as an addition for increasing stiffness and strength in the same time. Polymers are preferable...

... is very less. tunnel alignment Reservoir Characterization shotcrete steel excavation rock condition thick shotcrete rock bolt construction lattice girder contractor head race tunnel adit tunnel support system deformation soft ground condition Goshai adit ISRM International...

... on the requirements of the application. Wide use in shotcrete and segmental linings worldwide has now and again shown the importance of steel fibres in such applications. Establishing quality assurance of FTC needs to be implemented. For this, proper batching systems and methods need to be enforced in project sites...

.... renewable energy rockbolt dynamometer powerhouse rock mass Reservoir Characterization cavern cable anchor dynamometer excavation extensometer Xiangjiaba Hydropower Station shotcrete powerhouse complex cross section displacement excavation technology underground powerhouse Stability Study...

... is gaining importance. After the mid-fifties of the last century new materials, namely shotcrete and rock anchors, replaced the old timber support and the masonry lining was abandoned for a permanent lining of in-situ concrete. In addition, the waterproofing quality of tunnels was considerably improved...

... 14D where s = exp [(GSI 1009-3D)] a = (1/2) + (1/6)[e -GSI/15 e-20/3], D is the disturbance factor and GSI is Geological Strength Index of the rock mass. Different rock support measures such as rock bolts and shotcrete are considered explicitly in the model to mitigate the displacements. Analyses...

... displacement metro tunnel Upstream Oil & Gas gallery lattice girder Mining Engineering support system shotecrete stability excavation construction Tohid tunnel deformation Reservoir Characterization axial force shotcrete surface settlement tunnel settlement University...

..., shotcrete, etc., is well documented in a variety of empirical guidelines in the mining and civil engineering rock mass classifications. The mining scheme (the Mathews method, Golder Associates, 1981, Potvin et al., 1989 and the MRMR system, Laubscher, 1977) provide information on cable support, while...

... zone shotcrete Upstream Oil & Gas Fault Zone reinforcement borehole concrete lining tunnel sedimentary rock classification type ISRM International Symposium 2008 5th Asian Rock Mechanics Symposium (ARMS5), 24-26 November 2008 Tehran, Iran 845 DESIGN OF HIGH SPEED RAILWAY TUNNEL...

... relationship shotcrete deformation numerical calculation Magnitude ISRM International Symposium 2008 5th Asian Rock Mechanics Symposium (ARMS5), 24-26 November 2008 Tehran, Iran 809 PREDICTION OF DISPLACEMENTS IN TUNNELS N. Radon i 1 T. Pilgerstorfer1 and Wulf Schubert1 1Insitute for Rock Mechanics...

... is worked out between the walls of two tunnels. The 20m length of tunnel in portal zone from both ends has been designed with steel rib supports and the rest of the tunnel designed with rock bolt and shotcrete supports. Keywords: Tunnel design; Quartzites; Slates; Q-system; Numerical analysis. 1...

... mass classification method rock wedge instability rock mass tunnel recommendation shotcrete stress field hshp tunnel wedge analysis cld tunnel friction angle ISRM International Symposium 2008 5th Asian Rock Mechanics Symposium (ARMS5), 24-26 November 2008 Tehran, Iran 819 AN EVALUATION...