I am currently looking into the behaviour of Chalk slurry generated from a
tunnel boring machine and its behaviour after discharge to a disposal site.
In the past considerable mechanical treatment has been necessary to dry the
material and gain in strength has been restricted by the moisture content.
Typically the moisture content may be 300% plus when pumped from TBM to
disposal site reducung reasonably quickly by self drainage to perhaps
40-50%. Some time is then required for moisture to reduce to less than 30%
which seems to induce a very rapid increase in strength to high values.
I am looking at mechanical treatments and chemical additives to achieve a
material with a minimum undrained shear strength of 50kPa within 3 months.
Does anyone have any comments or experience of this problem.
Regards
Nick Mather
Internal extension - 5843
External direct dial tel. no: 0171-681-5843(UK)
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