WebOct 23, 2010 · Large flat jack tests are used to assess rock mass deformability in the design stages of large projects. The paper introduces a methodology for interpretation of the … WebSpecimens are placed in a triaxial cell and subjected to the predetermined stress condition in terms of confining pressure (related to uniform horizontal stress), vertical stress (over-burden stress) and pore pressure. Injecting a constant flow rate into the cavity hole pressurizes the specimen.
Jacking Methods SpringerLink
WebSep 1, 2015 · The Flat Jack method is a “cancellation” in-situ stress test method, in which a thin slot is cut into the rock surrounding an underground opening and a pressure gage is inserted into the slot (Fig. 1a). The pressure in the flat jack is increased until the recorded strain relaxation of the sidewall is cancelled (Fig. 1b). WebJul 5, 2024 · Flat jack tests are performed in slots at different orientations to allow in situ stresses to be estimated by recording the orientations of the slots and measurement-pin pairs, and the pressure required to deform the rock to its preslot position. Fig. 1 Four steps of flat jack test. ( a) Installing reference pins and measuring distances. cryptopay swiper wiring diagram
Experimental Evaluation of Rapid Flat Jack Testing with
WebThe Flat Jack method is a “cancellation” in-situ stress test method, in which a thin slot is cut into the rock surrounding an underground opening and a pressure gage is inserted into … WebOnePetro October, 2014. The deformability tests conducted by using plate jacking test, plate loading test, Goodman jack test and laboratory test show the comparison among different measurements and scale effects on deformability of rock mass. Plate load test, flat jack test and Goodman jack test give values of modulus of deformation which are 2 ... WebMay 1, 2004 · The NX borehole jack test is the most widely used method to determine the deformation modulus of rock mass in the field. The common borehole jack, also known … cryptopay tap