STP477

    Development of Equipment for Determining Deformation Modulus and In Situ Stress by Means of Large Flatjacks

    Published: Jan 1970


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    Abstract

    Development of equipment and proposed procedure for determining deformation modulus and in situ stress in rock masses is discussed. The procedure, which involves the use of large flatjacks, when perfected, will be considerably more economical than conventional, more elaborate methods such as the pressure chamber method, radial jacking, and the like. The flatjack procedure involves the cutting of a slot in the rock mass by means of a hydraulically powered 3-ft-diameter diamond saw, insertion of the large 3 by 6-ft flatjacks, and pressurizing of the jacks until cancellation is reached. The system has an advantage over conventional flatjack usage in that it permits pressurizing (testing) larger areas of rock, eliminates the need for grouting the flatjacks, and permits the determination of deformation modulus in addition to in situ stress.

    Keywords:

    stress analysis, modulus of elasticity, stresses, stress relieving, rock mechanics, rocks, construction equipment, tests, deformation, evaluation


    Author Information:

    Deklotz, EJ
    Director and research engineer (1st Lt., U. S. Army CE), U. S. Army Corps of Engineers, Omaha, Neb.

    Boisen, BP
    Director and research engineer (1st Lt., U. S. Army CE), U. S. Army Corps of Engineers, Omaha, Neb.


    Paper ID: STP29143S

    Committee/Subcommittee: D18.12

    DOI: 10.1520/STP29143S


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