{"id":3937,"date":"2013-01-15T15:51:57","date_gmt":"2013-01-15T15:51:57","guid":{"rendered":"http:\/\/robbinstbm.com\/?p=3937"},"modified":"2017-06-01T03:30:54","modified_gmt":"2017-06-01T03:30:54","slug":"jollyville","status":"publish","type":"post","link":"https:\/\/www.robbinstbm.com\/ru\/jollyville\/","title":{"rendered":"Salamanders, Pseudo Scorpions, and Quartz Crystals: How my Recent Site Visit proved that TBM Tunneling is the Greenest Way to Go"},"content":{"rendered":"<p><!--:en--><\/p>\n<div id=\"attachment_3938\" style=\"width: 645px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/www.robbinstbm.com\/wp-content\/uploads\/2013\/01\/MB_368_Jollyville_shaft_2012.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-3938\" class=\"size-full wp-image-3938\" title=\"MB_368_Jollyville_shaft_2012\" src=\"https:\/\/www.robbinstbm.com\/wp-content\/uploads\/2013\/01\/MB_368_Jollyville_shaft_2012.jpg\" alt=\"\" width=\"635\" height=\"400\" \/><\/a><p id=\"caption-attachment-3938\" class=\"wp-caption-text\">View from the bottom of a deep shaft at the Jollyville Transmission Main.<\/p><\/div>\n<p>The Balcones Canyonlands just north of Austin, Texas, USA is a protected wildlife preserve, and it\u2019s not open to the public.\u00a0 So when the city of Austin opted to build a 10.5 km (6.5 mi) long water line directly below it, there was understandably some concern\u2014but not for humans. The inhabitants of the Canyonlands include some of the state\u2019s most endangered species, from tiny, <a href=\"http:\/\/en.wikipedia.org\/wiki\/Texella_reyesi\">blind cave spiders<\/a> to songbirds to the green-speckled <a href=\"http:\/\/en.wikipedia.org\/wiki\/Jollyville_Plateau_Salamander\">Jollyville Plateau Salamander<\/a>.\u00a0 And don\u2019t forget the <a href=\"http:\/\/www.amersol.edu.pe\/es\/PYPUnits\/grade1\/Unit6\/habitat\/toothcavescorpion.asp\">pseudo scorpions<\/a>.\u00a0 \u00a0The <a href=\"http:\/\/www.austintexas.gov\/department\/jollyville-water-transmission-main-0\">Jollyville Transmission Main<\/a>, a pipeline planned to bring drinking water to the drought-ridden city, was designed deep below protected aquifers in chalk, up to 106 m (350 ft) down in limestone rock.\u00a0 This made tunneling the only option.\u00a0 But even so, how could the project avoid impacting such a sensitive environment?<\/p>\n<p>When I visited the site in Autumn 2012, I got my answer. The contractor, Southland\/Mole JV, is taking every precaution to mitigate impact, and they\u2019ve been very successful thus far.\u00a0 An environmental consultant from the city is on the site daily, and routine inspections ensure that the minimally invasive tunnel is not encroaching on the habitat of the endangered animals.<\/p>\n<p>Our guides for the visit, Kent Vest and John Arciszewski of Southland Contracting, took us to the 82 m (270 ft) deep Four Points Shaft first, which has been partially reinforced with liner plates.\u00a0 Kent and John explained that during excavation, water inflow from the aquifer had been high enough that the city opted to grout behind the liner plates to prevent further dewatering.\u00a0 Gravel in the annular space between the liner plates and shaft walls would keep any groundwater pathways intact.<\/p>\n<p>As we descended into the unlined tunnel where a 3.25 m (10.7 ft) <a href=\"https:\/\/www.robbinstbm.com\/news\/jollyville-launch\/\">Robbins Main Beam TBM<\/a> was averaging 55 m (180 ft) per day, we talked ground support\u2014or the lack thereof.\u00a0 Three TBMs are being used to excavate portions of the tunnel in competent limestone. \u00a0Southland is not permitted to do either pre-excavation drilling or grouting because of the possibility of karst cavities and groundwater pathways\u2014areas where endangered aquatic species might live.\u00a0 While they plan to install wire mesh and rock bolts if it\u2019s needed, the rock quality has so far been very good with little ground water.\u00a0 We took a few photos while in this tunnel (see below), and then moved on to the next site.<\/p>\n<div id=\"attachment_3939\" style=\"width: 645px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/www.robbinstbm.com\/wp-content\/uploads\/2013\/01\/MB_368_Jollyville_guysintunnel_2012.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-3939\" class=\"size-full wp-image-3939\" title=\"MB_368_Jollyville_guysintunnel_2012\" src=\"https:\/\/www.robbinstbm.com\/wp-content\/uploads\/2013\/01\/MB_368_Jollyville_guysintunnel_2012.jpg\" alt=\"\" width=\"635\" height=\"400\" \/><\/a><p id=\"caption-attachment-3939\" class=\"wp-caption-text\">The Southland crew in the tunnel.<\/p><\/div>\n<div id=\"attachment_3940\" style=\"width: 645px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/www.robbinstbm.com\/wp-content\/uploads\/2013\/01\/MB_368_Jollyville_boredtunnel_2012.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-3940\" class=\"size-full wp-image-3940\" title=\"MB_368_Jollyville_boredtunnel_2012\" src=\"https:\/\/www.robbinstbm.com\/wp-content\/uploads\/2013\/01\/MB_368_Jollyville_boredtunnel_2012.jpg\" alt=\"\" width=\"635\" height=\"400\" \/><\/a><p id=\"caption-attachment-3940\" class=\"wp-caption-text\">The unlined tunnel.<\/p><\/div>\n<p>Our last site visit of the day was the deepest\u2014the 106 m (350 ft) Jollyville shaft next to the similarly named Jollyville Reservoir in a much more urban location.\u00a0\u00a0 Once we\u2019d been lowered down the shaft, we found a small, unlined tunnel in competent limestone.\u00a0 A 3.0 m (9.8 ft), contractor-owned Double Shield TBM was tunneling this reach, after having been refurbished by Robbins in Solon, Ohio.\u00a0 Similarly, the machine was getting some fast advance rates of 46 m (150 ft) per day on average.<\/p>\n<div id=\"attachment_3941\" style=\"width: 645px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/www.robbinstbm.com\/wp-content\/uploads\/2013\/01\/MB_368_Jollyville_TBMoperator_2012.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-3941\" class=\"size-full wp-image-3941\" title=\"MB_368_Jollyville_TBMoperator_2012\" src=\"https:\/\/www.robbinstbm.com\/wp-content\/uploads\/2013\/01\/MB_368_Jollyville_TBMoperator_2012.jpg\" alt=\"\" width=\"635\" height=\"400\" \/><\/a><p id=\"caption-attachment-3941\" class=\"wp-caption-text\">The TBM operator in the small tunnel sits next to the machine conveyor.<\/p><\/div>\n<p>What I immediately noticed in this tunnel was the multitude of small, mostly dry karst cavities down the tunnel walls.\u00a0 These cavities could potentially be home to the blind cave spiders, though none had been found during tunneling and it was likely they wouldn\u2019t live in such small voids.\u00a0 We noticed, during our ride on the muck train towards the machine, sparks of light emitting from these cavities.\u00a0 Once we stopped John reached into a cavity and pulled out a handful of quartz crystals.\u00a0 \u201cThese are all over, in all these cavities.\u00a0 You can take some with you,\u201d he said.\u00a0 As I am part-pirate (my genealogy traces back to <a href=\"http:\/\/en.wikipedia.org\/wiki\/Francis_Drake\">Sir Francis Drake<\/a> on my mother\u2019s side!), I decided to stuff my pockets with the sparkly crystals (i.e., treasure!).\u00a0 I had never seen anything like this before, but John explained that the minerals in the perched water in many of the pockets caused the crystals to grow.\u00a0 Since the pockets were small, they weren\u2019t filled in or isolated and we could pluck quartz crystals to our heart\u2019s content.<\/p>\n<div id=\"attachment_3942\" style=\"width: 645px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/www.robbinstbm.com\/wp-content\/uploads\/2013\/01\/MB_368_Jollyville_karsts_2012.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-3942\" class=\"size-full wp-image-3942\" title=\"MB_368_Jollyville_karsts_2012\" src=\"https:\/\/www.robbinstbm.com\/wp-content\/uploads\/2013\/01\/MB_368_Jollyville_karsts_2012.jpg\" alt=\"\" width=\"635\" height=\"400\" \/><\/a><p id=\"caption-attachment-3942\" class=\"wp-caption-text\">Shining a light on the tiny cavities.<\/p><\/div>\n<div id=\"attachment_3943\" style=\"width: 645px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/www.robbinstbm.com\/wp-content\/uploads\/2013\/01\/MB_368_Jollyville_quartzcrystals_2012.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-3943\" class=\"size-full wp-image-3943\" title=\"MB_368_Jollyville_quartzcrystals_2012\" src=\"https:\/\/www.robbinstbm.com\/wp-content\/uploads\/2013\/01\/MB_368_Jollyville_quartzcrystals_2012.jpg\" alt=\"\" width=\"635\" height=\"400\" \/><\/a><p id=\"caption-attachment-3943\" class=\"wp-caption-text\">Quartz crystals!<\/p><\/div>\n<p>On a more serious note, Southland does have a plan of action if large cavities are found or if a groundwater pathway is very open and linked to the aquifer.\u00a0 In this case, large voids would be isolated and sealed off to protect the habitat within.\u00a0 If ground water inflows are severe they will install steel liner plates and grout behind them to stop the flow.\u00a0 But, says Southland, they don\u2019t expect to encounter either of these since the tunnels are so far below the aquifer.\u00a0 In fact, one reach of the tunnel, already complete at the time of our visit, had encountered almost no groundwater in 1,300 m (4,400 ft) of tunneling.<\/p>\n<p>Once back on the surface, it became clear to me that this well-designed project proved that tunneling, particularly TBM tunneling, could be used safely in even the most sensitive environments.\u00a0 The foresight, planning, and execution by the designers and contractors was impressive.\u00a0 The salamanders and pseudo scorpions thank you.<!--:--><!--:zh--><\/p>\n<p><!--:--><!--:es--><\/p>\n<p><!--:--><!--:ru--><\/p>\n<p><!--:--><\/p>\n","protected":false},"excerpt":{"rendered":"<p>What do these three things have in common? They all factor in to the environmentally friendly tunneling operations at the Jollyville Transmission Main in Austin, Texas, USA.  Read on for more insights from our recent site visit.<\/p>\n","protected":false},"author":9,"featured_media":8331,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":"","_links_to":"","_links_to_target":""},"categories":[30,103,35],"tags":[],"class_list":["post-3937","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-30","category-from-the-field-ru","category-redefining-the-industry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Salamanders, Pseudo Scorpions, and Quartz Crystals: How my Recent Site Visit proved that TBM Tunneling is the Greenest Way to Go - Robbins<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.robbinstbm.com\/jollyville\/\" \/>\n<meta property=\"og:locale\" content=\"ru_RU\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Salamanders, Pseudo Scorpions, and Quartz Crystals: How my Recent Site Visit proved that TBM Tunneling is the Greenest Way to Go - Robbins\" \/>\n<meta property=\"og:description\" content=\"What do these three things have in common? 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