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5. EXPERIMENTAL PROGRAM

The experimental program conite! o" t#o component. The "irt #ala$orator% terting o" pipe ection in or!er to !etermine their ti""ne&ti""ne "actor ' EI() *ertical !e"lection or train) #hich in!+ce crac,ing inthe inner pipe liner an! collape loa!. The econ! #a a "iel! in*etigation

#hich incl+!e! opening o" tet pit at e*eral ection along the pipeline.Exca*ation o" the let pit allo#e! "or *i+al !ecription o" the oil-trenchcro ection) an! per"ormance o" !%namic cone penetration &/P( tet#ithin the an! $ac,"ill alongi!e the pipe) The "iel! in*etigation #a limlte!to a 330 m pipeline egment.

5. l. re+lt o" tet on pipe ection

Ring compreion &$en!ing( tet #ere carrie! o+t on three ection o" pipe.Each ection #a place! in a h%!ra+lic pre an! loa!e! acro it *ertical!iameter $% a line loa! along the "+ll egment length. Thro+gho+t loa!ing o" each tet ection) *ertical an! hori1ontal !e"lection #ere monitore!. 2i+al

 ph%ical !amage to the inner pipe lining &crac,ing( #a alo recor!e!. ig+re3&a( preent the experimental loa! !e"orrnation c+r*e o" one o" the pipeection togethcr #ith o$er*ation #ith repect to crac, !e*elopmentthro+gho+t the tet. ig+re 3&$( ho# that the re+lt "or the three ectionare "airl% imilar)

ae! on the !ata preente! in ig) 3 it ir poi$le to o$tain the "ollo#ingin"ormation

&l( The collape loa! o" the pipe ection i $et#een 50 an! 55 ,N6m. /ollapeocc+rre! at *ertical !e"lection o" 73-89 mm #hich correpon! to!iametrical train o" 5-9:. it i note! that thee *al+e characteri1e the+n+pporte! $eha*ior o" pipe ection.

&;(The maxim+m moment acting in the pipe ection at the collape loa! ma% $e !otermine! $% e

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!epth o" approximatel% =)7-l.8 m. The en! point o" the o+n!ing #a locate!at a !epth o" approximatel% 0)5 m $elo# th pipe in*ert. The plot ho#n inig. 4 are t%pical re+lt "o+n! at ix tation. It i notr! that) in