New Tunnel Project In Peru Through Andes 30 May 2008 rockman 13 Comments Categories: Project Related Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on Google+ (Opens in new window)Click to share on LinkedIn (Opens in new window)Click to share on Pinterest (Opens in new window)Click to share on Reddit (Opens in new window)Click to email this to a friend (Opens in new window) Related Comments Mona Kotak Written on June 9, 2008 More information on this projectCAn you send me more inifirmation on this project and also the companies and people involved in this project. Regards, Mona rockman Written on June 9, 2008 This is all I have…Hi Mona, I just came across the project through ENR (link at top of the article). I’m afraid I don’t have any other info. If you find anything else, by all means drop us a note or leave another comment here. — Rockman llolla Written on June 12, 2008 I work on one of these projects where “they” are boring underground (using a Tunnel Boring machine – TBM) to feed water from one reservoir to another. I have no direct hand in the geotechnical applications of the project, as I mostly deal with the chemistry of the rock/muck that comes out behind the TBM. Our TBM has been slowed by incomplete knowledge of the rock (from drill core) and is becoming a costly (oh god you can’t imagine how costly a TBM is) project. I can’t even begin to imagine the bill at the end of this project. And maybe it doesn’t matter, water means life. Gawd-i would love/go crazy/be so scared if I were to be underground in that tunnel rockman Written on June 12, 2008 Hey llolla, Sounds like interesting work. What is your background? Geology? Geochemistry? Or something else? I can imagine it’s hard to get good geotechnical and geological data on the rock that the TBM will be drilling through, even if it isn’t 7,000 ft underground like this project. I imagine you drill for a couple hundred ft and at the bottom you get 30-ft of core that will be in the path of the TBM, then you move a few hundred/thousand ft away and do it again. Not a very complete picture of the material the TBM has to drill through. Thanks for the comment. — Rockman Alvaro Written on June 28, 2008 Hi Mona, I’m part of the Robbins Co. crew in the Olmos Project, There is just two companies, Odebrecht and The Robbins Co. Regards Michael Dennis Stagg Written on May 18, 2009 They used on site pre-drill exploration for quite a few cut tunnels ensures one does not chop a leak into the tunnel wall and also gives local data … just makes it a little difficult for forward drive into unknown which may your tunnel direction vulnerable … pilot drives have been common as in coal mines but there they have some bedding previous knowledge to follow through and a high return on the yield , it leads to better local pinning data and that has been used to some good result, if geophysics and general section improves maybe only uncertain stability and water ingress may need pre-plan research drills as increased drilling leaves dataset behind from projects over the years … our best source, research is usually too specific and chemical, then projects could forward with more specific data out of the tunnel drive as it goes as log as the pre-geo-structure and technology answers make it safe. Mike Michael Dennis Stagg Written on May 18, 2009 it may … make … your tunnel direction vulnerable to change to drill laterally as you go, although it does reduce vertical drill cost and damage risk … sorry about preceding mistype N.K.Agarwal Written on June 9, 2009 Hi, (1)I would be glad to know kind of geological-geotechnical problems being faced during tunnelling by TBM and solutions suggested to overcome in the project, kindly give the excavated dia of the tunnel. (2) The present cost per meter of tunneling. Bob Cummings Written on June 22, 2009 Site investigations for deep tunnels are problematic because as Rockman has said, drilling from the top produces a lot of hole length that is not relevant to the tunnel geology. You can whipstock holes and reach more than one location from a single setup but it wtill products a lot of drilled length. However, seldom is such a project undertaken with no knowledge of the tunnel geology. There should be at least a few holes, which can be tied together with inferences from geologic mapping and geophysics. One way to tackle the subsurface exploration problem is to conduct drilling from the tunnel portal and once progress is made, from the face, but access behind the TBM cutterhead for this is a problem. It’s easier with drill-and-blast tunnels, although not often done. The biggest fear in tunneling is the sudden inrush of water, which is one reason it is ideal to carry a pilot hole 50-300m in front of the face. The second biggest fear is squeezing/caving ground. At these depths the rock stresses are significant, and if the sides sluff or are soft, you can be in trouble real fast. TBMs must be able to exert high radial pressures on the tunnel walls in order to develop enough thrust and control the direction of thrust. If the ground squeezes and the pads penetrate deeply, a TBM can become stuck. There have been instances of early TBMs that remain entombed because of unanticipated soft ground. There are also concerns for rock stress conditions, particularly when passing through an active subduction zone like the Andes, at depth. The depth range mentioned is just within the envelope of possible rock burst conditions. For this project I think the published TBM cost range would probably not be applicable. Altogether a challenging project. I am ready to buy my plane ticket tomorrow….. Marijn Written on December 20, 2009 hi everybody ive seen this project on discovery and i wonder how far are they was it on discovery up to date or not cuz it was an awesome project and realy fasanating ( srry if thats not correct ). it was good for the people on the west side so pls tell me when its finised 😀 Marijn Peter Written on December 24, 2009 I also just watched this on Discovery and was wondering if it is complete, and the rest of the story about it. Its very disappointing when Discovery only do “half” the story and leave the viewers wondering if the project ever succeded >:( Randy Post Written on May 24, 2010 According to [url=http://geoprac.net/s/l]this ENR article[/url], the TBM had made it approximately 70 percent of the 20-km when they suffered a serious setback last month. A rockburst damaged a hydraulic cylinder connected to one of the grippers and even injured two workers in the operator cabin. A nationwide search is on by the Robbins Company, makers of the TBM to find a replacement part. If one cannot be found, it will require 6-months to manufacture. From the article, it sounds as if there have been many rockburts and the going has been fairly tough. Projected earliest completion date is July 2011. Alok Pathak Written on March 21, 2011 What is the status of this project?How far it is behind the schedule completion.