{"id":5204,"date":"2021-01-07T11:22:29","date_gmt":"2021-01-07T11:22:29","guid":{"rendered":"https:\/\/suri.templweb.com\/2021\/01\/07\/mountain-accommodating-new-metro\/"},"modified":"2021-12-03T14:21:03","modified_gmt":"2021-12-03T14:21:03","slug":"mountain-accommodating-new-metro","status":"publish","type":"post","link":"https:\/\/suri.templweb.com\/en\/mountain-accommodating-new-metro\/","title":{"rendered":"The mountain accommodating the new metro"},"content":{"rendered":"
Preferably Stockholm granite but never episyenite. That is what the geologists want. Join us as we go down amongst the gneiss, fissure systems, and mountain cracks.<\/span><\/address>\n

Geologists are carefully studying the rock dawning as the tunnels are blasted into being. Their tunnel mappings are important for how the work will proceed.
\u201cThe tunnels are blasted in stages of up to twenty meters. After that, we’ll do a mapping before the tunnelling can continue. A mapping takes about an hour and is a collaboration between us, the construction management, and the contractor working on the site,\u201d says geologist Bj\u00f6rn Enster\u00f6.
Early in the planning of the subway a forecast of the mountain was made, but the mountain can still surprise.
\u201cWe document and characterize all mountains. We draw in and photograph what rocks are found in walls and ceilings, drawing cracks and groups of cracks and what properties they have. It determines how the mountain is to be handled and reinforced.\u201d<\/span><\/p>\n

So what kind of rock is the new metro being built in?<\/strong>
\u201cGranite can be found almost everywhere. Amongst them Stockholm granite, which is a light grey or slightly red variant. It is massive and has high density. It is a good mountain to build tunnels in, which we are always happy to find, says geologist Jussara Louren\u00e7o.
Gneiss, which is common as well, contains undulating patterns and layers. That\u2019s good as well, although there are often cracks between the layers.
However, all mountains aren\u2019t good mountains for tunnelling. The geologists were less happy when they found the rock episyenite in Barkarby.\u201d
\u201cIt\u2019s porous and has low density. It\u2019s enough to tap it lightly for it to break, so there we have to reinforce the mountain significantly. We hope that we don\u2019t come across it in more places,\u201d says Jussara Louren\u00e7o.
Other types of rock that are good for tunnelling are dioritis and gabbro.
\u201cGenerally the Stockholm area has good bedrock for tunnels.\u201d<\/span><\/p>\n

\"\"<\/p>\n

Mountains contain more or less cracks. Some cracks contain clay while others carry water and need to be sealed. The picture shows a sawn-off section of rock at the mouth of the work tunnel in Sickla in Nacka.<\/em><\/p>\n

 <\/p>\n

Sealing cracks and water emanation<\/strong><\/span>
The density of the rock is largely dependent on the amount of cracks and crack systems. Some cracks are filled with mud, while others contain water, and then the tunnel must be sealed.
More cracks mean more work due to having to reinforce the rock with concrete and bolts.
\u201cSelective bolting can be chosen if the rock is good \u2013 in that case bolts are drilled into the rock in specific places only. If the mountain is less dense, bolts have to be attached systematically, which means more bolts in special patterns,\u201d says Sofie Eskilander.
The worst type of rock is crush zones, where the mountain has been crushed together and stretched out making it brittle.
\u201cThat’s where the mountain crumbles apart completely. We usually talk about granular rock (sockerbitsberg).
Crush zones are found, for example, at faults in Gullmarsplan and S\u00f6dermalm.<\/span><\/p>\n

 <\/p>\n

Important for the future<\/strong><\/span>
The work of geologists is important not only in the construction of tunnels, but also for the future.
\u201cThe tunnels are covered in concrete and sometimes also in materials that redirect leaking water. In those cases it’s our documentation they have to adhere to when the tunnels are to be maintained. If something needs fixing in a certain place, it should be possible to read about what the mountain looks like right there.
The new metro has about 15 geologists today, but there will be more, according to Jussara Louren\u00e7o.
\u201cWe will work on more tunnel sections at the same time and eventually also work in shifts.\u201d<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

Preferably Stockholm granite but never episyenite. That is what the geologists want. Join us as we go down amongst the gneiss, fissure systems, and mountain cracks. Geologists are carefully studying the rock dawning as the tunnels are blasted into being. Their tunnel mappings are important for how the work will proceed.\u201cThe tunnels are blasted in […]<\/p>\n","protected":false},"author":3,"featured_media":6140,"comment_status":"closed","ping_status":"open","sticky":false,"template":"templates\/template-press-news.php","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[],"tags":[],"class_list":["post-5204","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry"],"acf":[],"yoast_head":"\nThe mountain accommodating the new metro<\/title>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"The mountain accommodating the new metro\" \/>\n<meta property=\"og:description\" content=\"Preferably Stockholm granite but never episyenite. That is what the geologists want. Join us as we go down amongst the gneiss, fissure systems, and mountain cracks. Geologists are carefully studying the rock dawning as the tunnels are blasted into being. 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