SYMPOSIA PAPER Published: 01 January 1974

Bureau of Reclamation Procedures for Conducting Uniaxial Jacking Tests


The Bureau of Reclamation's present method of conducting uniaxial jacking tests incorporates the desirable features and techniques developed over many years of testing. Successful tests yielding usable data are attributed to thorough pre-test geologic exploration; careful site preparation; special drilling and explosive excavation techniques; and well-planned procedures for installation and removal of specialized equipment. Non-engineering factors, such as good contractor-test team relationship, also play a critical role in a successful test program. The process where hydraulic flatjacks are used to apply desired loads to prepared rock surfaces within a tunnel is described. Instrumentation to measure resulting displacement is referenced within the rock mass and is independent of the loading system. Details of all phases of conducting the tests are presented. In addition, a discussion is given of some of the problems, solutions, and philosophies that evolved while tests were being planned or conducted. This discussion is of value to those conducting in situ jacking tests or those preparing standards for the tests.

Author Information

Misterek, DL
Bureau of Reclamation, Denver, Colo.
Slebir, EJ
Bureau of Reclamation, Denver, Colo.
Montgomery, JS
Bureau of Reclamation, Denver, Colo.
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Developed by Committee: D18
Pages: 35–51
DOI: 10.1520/STP32142S
ISBN-EB: 978-0-8031-4641-9
ISBN-13: 978-0-8031-0350-4