STP1331

    Flowable Fill Promotes Trench Safety and Supports Drainage Pipe Buried 60 ft (18.3 M) Under New Runway

    Published: Jan 1998


      Format Pages Price  
    PDF (420K) 10 $25   ADD TO CART
    Complete Source PDF (6.7M) 10 $65   ADD TO CART


    Abstract

    In 1995, Kent County International Airport began building a new crosswind runway. The new runway traversed a 66-ft (20.1-m) deep ravine and a stream. Designers chose to enclose the stream in a 60-in (1500-mm) inside diameter reinforced concrete pipe before building the runway embankment. To minimize earth loads on the rigid concrete pipe, a narrow 10-ft (3-m) trench was specified. Safety authorities demanded a wider trench, however, in spite of vertical clay trench walls. Because a wider trench would place unacceptable earth loads on the pipe, designers proposed a modified narrow trench and backfilling the pipe with flowable fill. Flowable fill was placed to the springline; then granular soil was compacted to 12 in (30 cm) above the crown of the pipe before a clay embankment was placed over it to the final grade. The culvert pipe has been inspected three times since installation and is performing well.

    Keywords:

    flowable fill, trench safety, concrete pipe, rigid pipe, deep fills, pipe design, SAMM, PIPECAR, trench design, buoyancy, airports, drainage


    Author Information:

    Hegarty, JR
    Civil Engineer, Prein & Newhof, Grand Rapids, MI

    Eaton, SJ
    Project Manager and Director of Airport Services, Rust Environment & Infrastructure, Des Moines, IA


    Paper ID: STP13078S

    Committee/Subcommittee: D18.14

    DOI: 10.1520/STP13078S


    CrossRef ASTM International is a member of CrossRef.