. The trackman's helper, a handbook for track foremen, supervisors and engineers . uble on account of slippage. At this point thefill is 25 feet high with the slip all on the westboundside. The eastbound track requires no more atten-tion than other points with a fair sub-grade. The original ground surface is of good support-ing material so that the settlement could not be at-tributed to a poor foundation. The first section cutin the fill was cut down to the original ground to de-velop any water pockets if they existed. This sectionwas not, however, cut through the entire width ofthe fill, as t
. The trackman's helper, a handbook for track foremen, supervisors and engineers . uble on account of slippage. At this point thefill is 25 feet high with the slip all on the westboundside. The eastbound track requires no more atten-tion than other points with a fair sub-grade. The original ground surface is of good support-ing material so that the settlement could not be at-tributed to a poor foundation. The first section cutin the fill was cut down to the original ground to de-velop any water pockets if they existed. This sectionwas not, however, cut through the entire width ofthe fill, as the material under the eastbound track 82 THE TRACKMANS HELPER was found dry and in good stable condition. Fromtime to time, cinders have been unloaded at this pointand used to bring the fill up to normal sub-grade ele-vation and fill out the shoulder. The first section cutshowed the cinder extending to a depth of 12 feetbelow the top of rail. Underlying the cinder was alayer of slippery saturated clay, about a foot in thick-ness, upon which the cinder moved toward the toe Cross. Z^/// ?^;^///i%> Action Looking EastT(jpic3l Cross Section Oranqeville nil Cinders ^Mm CrossDrains SaturatedClay Fig. 10. Original GroundSection Lookmq EastTijpical Cross Section Dkridge rill. Cross Sections of Two High Fills on theB. & 0. R. R. of the fill. Although it was not marked, there wasevidently some movement of this clay which wouldaccount for the depth of the cinder under the is probable that this condition is the result ofwater pockets. The pumping action of passingtrains has worked the shoulder of the fill down also,leaving no defined pocket and forming the section DRAINAGE 83 shown. Under the layer of saturated clay, the mate-rial rapidly became dryer and assumed normal con-ditions. Five cross drains were constructed at points wherethe settlement was most marked. The first sectioncut having developed the fact that there was no waterpocket in the fill, the subsequent cross drain
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