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[quote user="MidlandMike"]I am still trying to understand the 20" offset in the tubing. Did two liner ring segments seperate, and thus there was a parting of the tube?[/quote] I found just this statement no further details. If you look at tubbing segments the can't be pushed out easily as their outer arc length is longer than an inner opening: <a href="http://www.rastatt.de/fileadmin/Stadt_Rastatt/Bilder/Inhaltsbilder/Rathaus_u_Politik/Presse/2017_Pressemitteilungen/2017_5/265-2017__T%C3%BCbbinge.JPG">http://www.rastatt.de/fileadmin/Stadt_Rastatt/Bilder/Inhaltsbilder/Rathaus_u_Politik/Presse/2017_Pressemitteilungen/2017_5/265-2017__T%C3%BCbbinge.JPG</a> That only works if a joint gets pushed in. On the other hand there is the key-segment: <a href="https://1.f.ix.de/scale/geometry/700/q75/tr/imgs/08/7/6/7/1/4/6/Online_Tunnelgeothermie_Tu__776_bbing_1826.jpg-b738c7d16e727f9a.jpeg">https://1.f.ix.de/scale/geometry/700/q75/tr/imgs/08/7/6/7/1/4/6/Online_Tunnelgeothermie_Tu__776_bbing_1826.jpg-b738c7d16e727f9a.jpeg</a> It is seen here at the tunnel top. To put it in as last segment outer length and inner opening have to be of equal length. It could be pushed in as single segment. It is not always at the tunnel top as the following drawing shows: <a href="http://www.vde8.de/mediathek/file/2036/dToFyLnkH0Bu24dvcJU-Usm1JTlViZHj_qXh0g8Yh7s/finne_tuebbinge2.jpg">http://www.vde8.de/mediathek/file/2036/dToFyLnkH0Bu24dvcJU-Usm1JTlViZHj_qXh0g8Yh7s/finne_tuebbinge2.jpg</a> As the displaced segment moved one week after being set it was only able to move inwards. To the left and right were other liner rings. Yes, a longitudinal joints must have been forced open. The crack must have spread like a zipper effect over about 130'. Here is a photo inside the tunnel Rastatt: <a href="https://www.bo.de/sites/default/files/styles/artikeldetail/public/field/image/reiffit_ortenauticker_5615230e06b67.jpg?itok=onh8xmbJ">https://www.bo.de/sites/default/files/styles/artikeldetail/public/field/image/reiffit_ortenauticker_5615230e06b67.jpg?itok=onh8xmbJ</a> It shows that the conical and smaller segments are staggered against each other. That make a zipper effect even less understandable. Regards, Volker Edit: Perhaps we have to take the 20'', given in a press conference, with a grain of salt. A newspaper report from a meeting of DB personell and town inhabitants talks of 4'' displacement. A DB fakt sheet states: 40 meters (130'), on this length water and earth entered the tunnel on August 12th 2017, after tubbing segments were displaced. Looking at the tunnel inside I'm not sure anymore. How could there be zipper effect and a 130' liner damage with the staggered segments? Or did they mean there was a 130' long damage on the surface and in the soil?
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