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Title: Mole drainage investigation, 1946-1947 : draft of report
Authors: United States. Army. Corps of Engineers. New England Division.
Keywords: Airfields
Subsurface drainage
Mole drainage
Earth handling equipment
Issue Date: Jun-1947
Publisher: Arctic Construction and Frost Effects Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Technical report (Arctic Construction and Frost Effects Laboratory (U.S.)) ; no. 12-13.
Description: Technical Report
Summary: The purpose of this investigation is to develop a method of placing a strengthening liner on the walls of a hole made by a mole plow and to determine the feasibility of adapting this type of drainage to airfield subgrades and shoulders, both as an aid during construction and as a method of installing permanent subsurface drainage/ systems. A mole plow with provision for pumping asphalt and cement-mixtures out of the rear was constructed and used in a large scale test box filled with a fine silt. Tests were made with various extruded materials. An investigation was made concurrently to determine the possibility of using a flexible perforated plastic tubing to be placed by a cable laying machine. Basic conclusions determined from these tests are as follows: a.) It is believed that some type of mole drainage can be adapted as an economical and feasible method of draining airfield subgrades and shoulders. b.) The use of sand asphalt-mixture as a liner is not practical as a mixture possessing the minimum stability requirements cannot be made sufficiently fluid by heating to allow pumping by the pressure, method. c.) Field installations of strengthening liner of portland cement mixtures in the walls of a mole drain by use of either pressure grouting or cement gun is believed impractical due to the difficulty in controlling setting time or maintaining uniform flow and the uncertainty of obtaining a continuous drain. d.) Direct worm feed that can be synchronized with plowing speed is believed to be the practical method for extruding a portland cement mixture to ensure a continuous drain. e.) Placing a perforated plastic tubing by a cable laying machine appears to be a promising and economical method of strengthening the walls of the mole hole.
Appears in Collections:Technical Report

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