gopers.online

The most commonly used mesh is probably welded mesh made of approximately 5 mm thick steel wire and having 100 mm square openings. The steel wire may be galvanised or not. The alternative has been an interwoven mesh known as chain link mesh.  The disadvantage of traditional chain link mesh compared with weld mesh has been the difficulty of applying shotcrete successfully through the smaller openings available.  This difficulty has now been overcome in a high strength, light weight chain link mesh with 100 mm openings which is easy to handle and can be made to conform to uneven rock surfaces more readily than weld mesh. A feature of this mesh is the fact that the intersections of the wires making up the squares in the mesh are twisted rather than simply linked or welded. Roth et al. (2004) describe static and dynamic tests on this mesh.  Mesh of this type is being used successfully at the Neves Corvo Mine, Portugal, where it has been particularly successful in rehabilitating damaged exc

It is the differential electrical potential between the anode (+) and the cathode (-) which is key to the moist corrosion example described above. This differential is primarily generated by the difference in oxygen availability between the edge and the centre of the water droplet. Differential potentials can also be generated by the presence (and contact) of dissimilar metals immersed in an oxygenated electrolyte solution (Illston et al., 1979; Bryson, 1987).  Corrosion induced by such a coupling can be extremely aggressive and can result from the designed use of dissimilar metals (steel cables with aluminum plates or anchors) or from the presence of cablebolts in a rich sulphide ore.  Indeed, rock bolts in sulphide ore bodies have significantly reduced service lives (Hoey and Dingley, 1971; Gunasekera, 1992). Corrosion cells can also be generated on cablebolt surfaces at the point where abrupt transitions in environment occur. These include differential grout coverage, for example, a

It is perhaps remarkable to find that, although rock and cable bolts have been used in underground mining and construction for several decades (if not more than 100 years in the case of rock bolts), bolt elements and bolting systems continue to evolve and improve.  The papers presented to this symposium detail advances made in fully encapsulated resin and cement grouted bolts (Mikula 2004, Mould et al. 2004, Neindorf 2004), one pass mechanized bolting (Mikula 2004, Neindorf 2004) and bulbed cables (Yumlu & Bawden 2004), for example. The developments in ground support practices that have accompanied greater productivity, larger excavations and larger equipment are especially well-illustrated in the paper by Neindorf (2004) describing the evolution of ground support practices at the Mount Isa mine over the past 30 years. In a detailed and valuable review paper, Windsor (2004) concludes that “the quality and performance of cable bolts used to stabilise temporary, non-entry, production

I'm sure you have a bright idea hidden somewhere in the back of your mind that you just can't wait to test out. Of course you're not the only one with the bright idea. So what motivates you to churn those creative, or even inspiring juices to its utmost flavor? It's always best to set up a personal goal where you can accomplish the most in record time, maybe like mowing the lawn in an hour before the big game on TV. A correct and positive attitude in whatever you do will make things easier, and even enjoyable. Here are some tips to make it through the week even if you're just sitting in your favorite couch. An idea takes time to form in your head and is always at work while you are busy sitting. Having a bit of positive thinking can help you realize things that are never thought possible. Thinking big is indeed the American Way and that what made our country prosperous. 1. Take passionate action towards living your life by design. Talk is cheap.  Action = deposits i

We all have this favorite expression when it comes to being stressed out, and I wouldn't bother naming all of them since it may also vary in different languages. But when it comes down to it, I think that it is how we work or even relax, for that matter that triggers stress. Ever been stressed even when you're well relaxed and bored? I know I have. Since Error! Hyperlink reference not valid. is unavoidable in life, it is important to find ways to decrease and prevent stressful incidents and decrease negative reactions to stress. Here are some of the things that can be done by just remembering it, since life is basically a routine to follow like brushing your teeth or eating breakfast. You can do a few of them in a longer span of time, but as they say-- every minute counts. Managing time Time management skills can allow you more time with your family and friends and possibly increase your performance and productivity. This will help reduce your stress. To improve your time manag

Be all you can be, but it's not always in the Army. I often see myself as somewhat contented with my life the way things are, but of course it's hard to think of anything else when where are real issues to be discussed. Still I aspire for something deeper and more meaningful. So we're all pelted with problems. Honestly it shouldn't even bother or even hinder us to becoming all we ought to be. Aspirations as kids should continue to live within us, even though it would be short-lived or as long as we could hold on to the dream. They say you can't teach an old dog new tricks… or can they? 1. What do I really want? The question of the ages. So many things you want to do with your life and so little time to even go about during the day. Find something that you are good at can help realize that small step towards improvement. Diligence is the key to know that it is worth it. 2. Should I really change? Today's generation has taken another level of redefining 'self&

It might take a little coffee or probably a few rounds of beer or any other booze you could get your hands on when it comes to relaxing after a hard day's work. Well, yeah I'm guilty about that one as well, unless I'm caught dead wearing a lampshade over my head after a few rounds of vodka… half-naked! Okay, bad example and I apologize to everyone reading this after getting nightmares about me in that state of drunken stupor. Just don't ask how it happened, please. But what's really interesting is that how do people go through the usual part of life when faced with vein-popping stress? I mean, the new age thing like Zen or yoga is one of the good things and it actually works. Is there room for the intellectual side of people who can actually smell the roses-in-a-can while on the move? It kind of had me thinking that there really must be something in this 'mind-over-matter' thing. Humor is indeed the best medicine there is whenever you are. I mean anyone can

Collecting is a fun hobby, and one of the most interesting things to collect are art collectibles.  Many different items can be painted with artwork and become an art collectible.  Hobby enthusiasts collect such things as saw blades, and wooden eggs which have had artwork painted on.  People even collect designer rugs as art.  Another art collectible hobby is collecting limited edition plates, thimbles, Christmas ornaments, and figurines produced by such companies as Bradford Exchange.  And of course, many people collect fine art paintings. The person with an art collectible hobby will probably find his or her own favorite artists whose works they appreciate.  They can choose to focus on one particular artist, either past or present, or they can choose from the works of many artists.  On the other hand, they may collect art and art objects around a theme they enjoy, such as cigars, wild animals, or piano music.  One may think of an art collector as a rich person who has the money to sp