... geologist asia government coal mining excavation metals & mining reservoir geomechanics reservoir characterization intersection environmental science 833 practice iop publishing iop conf sedimentary rock geology turkey government geological subdiscipline theory shotcrete steel rock...

... of atomic hydrogen into steel causes the SCC in cable bolts, which is known as hydrogen-induced stress corrosion cracking (HISCC). While the research on the mechanism of the HISCC in underground mines needs to be continued, it is essential to develop prevention measures to avoid such a failure...

... the some level of PPV, an important increase in the calculated load on the arch steel support were observed in the stress concentration zones. These results are in good correlation with numerous cases of rockbursts occurred in the Polish mines. In our opinion, continuous measurement and controlling...

... ABSTRACT: The paper deals with the total load-bearing capacity of steel arch yielding supports of roadways which is inevitable for design of the roadway support. The authors compared results of a finite element (FE) model they developed with results of experimental tests of steel arch supports...

... of shotcrete panels in a specific dimension (60 cm × 60 cm × 10 cm). Although the quality of aggregate, cement, and water is so effective for a desirable shotcrete mixture, the bearing capacity of it is enhanced by the existence of steel or polypropylene fibers. In this study, various fiber reinforced...

... ABSTRACT: In underground coal mines, rockbolts and cable bolts are two dominant forms of support elements to prevent instability of the surrounding rock mass. Using these steel anchoring elements with high strength and toughness provides better rock reinforcement in high stress environment...

... was reduced, which lead to a reduction of the stone mud of 80%. This not only offers an economic advantage, but it is also resource-efficient. This method also shows advantages in the cutting of reinforced and ultra-high performance steel with a comparably soft steel, a material, which poses high demands...

... Abstract The initial objective has been to establish a methodology to use the convergence-confinement method in order to design the roadways support based on yielding steel arches, obtaining the same results than those from an empirical method widely used in coal mines. The mining method...

... diameter, fully grouted): length; spacing; wire mesh use. Shotcrete: thickness; place of application. Steel sets: need; rib class; spacing; use of lagging and forepoling. These guidelines have been included in almost every book and/or academic web dealing with RMR classi- fication (to mention only one...

... of actions have been taken to treat the collapse areas, including shotcrete-rock bolt support, steel arch, concrete backfill, and consolidation grouting without concrete covering. The treatment results are satisfactory per construction requirements. 1 Introduction 1.1 Project overview Wudongde...

... Abstract This paper describes a program that has been developed for stress corrosion cracking testing of rockbolt steels both in-situ in underground mines and in a controlled laboratory environment. Two types of double bent beam specimen have been used, a pin loaded specimen stressed to just...

... system was encountered. cavern rock support Computation crown settlement rail transportation mf faido shotcrete construction tunnel Reservoir Characterization steel stability excavation Fault Zone ground transportation intersection cavern intersection layout steel mesh support...

... their feasibility in situ. In this frame the network of galleries has to be extended to enable to carry out new experimentations. Upstream Oil & Gas vault laboratory Reservoir Characterization andra underground research laboratory convergence excavation main constraint France steel shotcrete...

... geomechanical classification Rotterdam Upstream Oil & Gas selection steel excavation convergence cavity means convergence measurement underground excavation convergence rate metals & mining Portugal information stability rock mass class Eurock '96, Barla (ed 1996 Balkema, Rotterdam...

... are all = cos(a) al2 = cos(90 - a) 0<21 = cos(e + 0<) (4) 0<22 = cos(e + a - 90) 20< + e = 180, 0<2 - al = e, al = a. Ratto of EJac : 1130.130 Dlametor of bar: 25.00 mm Bolt ~pll.ctng: .50 In [lactic HodululO of Steel: 210.1313 GPa Iene t le Strongth of Steel: 4513.013HPIl. .1 .2 .3 .4 STRAIN .5 .6 .7 Fig...

... lower temperature Finland Midstream Oil &amp; Gas steel specimen Poisson gabbro rock Reservoir Characterization strength porosity MPa storage chamber natural gas storage cavern rock cavern uniaxial compressive strength Deformation Characteristic fracture Eurock '93, Ribeiro e Sousa...

... is always the most important aspect in any mining enterprise. The metallic supports tested were mainly TH profile steel arches with friction couplings. Regarding the heterogeneity and complexity of the rock mass, five geo-mechanical situations surrounding the mining works can be defined (Table 1). 3...