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[quote user="RME"]There is an interesting discussion on the conversion of a 100mph line which needed rebuilding due to what I understood as being subgrade instability -- the specific details on how the subgrade was remediated here would be highly interesting.[/quote] I have looked into their German language broschure of their China projects. The soft soil in place was improved with all kind of piles, mostly CFG-piles with 24'' geo-grid reinforced cushion. I think that won't help to improve soil with track in place. <a href="http://www.bbri.be/index.cfm?dtype=services&doc=tc17_Ground_improvement_in_China_by_Zheng.pdf&lang=en">www.bbri.be/index.cfm?dtype=services&doc=tc17_Ground_improvement_in_China_by_Zheng.pdf&lang=en</a> To improve existing rail lines jet grouting may be useful: <a href="http://www.kellerholding.com/soilfrac-compensation-grouting.htm">http://www.kellerholding.com/soilfrac-compensation-grouting.htm</a><a href="http://www.kellerholding.com/soilcrete-jet-grouting.html">http://www.kellerholding.com/soilcrete-jet-grouting.html</a> Perhaps vibro compacting or vibro replacement may be possible depending on soil type, non-cohesive or conhesive. Regards, Volker
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