... ABSTRACT: A combination of field monitoring, Close Range Photogrammetry (CRP) and 3-dimensional numerical modeling is used in an underground potash mine to study the closure rates in the main panel as well as in large underground storage areas. The main interest is to predict the closure rate...

... closure rates, where pack performance was monitored. This paper highlights the differences between pack performance in the laboratory and underground environments. A suggested methodology for adjusting the laboratory strengths of grout packs for underground conditions is provided. This methodology...

... Upstream Oil & Gas particle velocity metals & mining extraction geologically bounded pillar fracture closure rate shaft pillar quantify remnant mining remnant extraction hazard closure closure ratio remnant Reservoir Characterization quantification peak particle...

... closure rate Upstream Oil & Gas quartzite step closure excavation metals & mining time-dependent behaviour hard rock stope face closure measurement closure profile reef closure response closure rate lava hangingwall instantaneous closure lava hangingwall closure hard lava...

... early time closure data. In this paper, we present the results of the early time closure response of this shaft, including a rather novel method of measuring the initial shaft diameter during construction. flow in porous media deep vertical borehole closure rate emplacement machine Fluid...

... metals & mining displacement data mining Simulation physical model excavation Upstream Oil & Gas calculation Geomechanically Munson underground room closure rate room closure constitutive model single room closure pseudostrain room array gage station early creep...

... load immediate roof onehydraulic-legged support closure curve pressure step roof closure Upstream Oil & Gas period pressure roof pressure resistance closure rate hz-a metal support closure Rock Mechanics as a Guide for Efficient UttTization ofNaturaI Resources, Khair (ed.) ¸ 1989...

... from a test borehole, important data trends were made more evident and average creep closure rates were able to be calculated. This process provided accurate estimates of closure rates that will be used in the design of lined boreholes in which heat-generating transuranic nuclear wastes...

... Upstream Oil & Gas instantaneous failure Nguyen Minh gallery tunnel circular gallery rockmass closure rate time dependent behavior strain rate structural geology calculation Reservoir Characterization Loading Rate construction phase frontier underground gallery brittle...

... data mining displacement metals & mining pseudostrain curve closure rate sequence station Upstream Oil & Gas calculation Modeling & Simulation dimension pseudostrain representation closure point multipass excavation excavation aceg center station sandia national...

... single site Upstream Oil & Gas variation waste management nuclear waste isolation equation 2 long-term creep closure test duration closure rate Reservoir Characterization Rock mechanics creep closure closure Battelle Memorial Institute prediction productivity creep rate...

..., and this implied a near constant closure rate of 78.5 mm/yr (3.1 in./yr). The neighboring station Q-26, displayed very similar behavior, 14 MAR 81 1.0 Q-26 ? o-26 I'1-26 120 24O 360 48O 6OO Tn (raYS) 5 Percent Closure in Room 26 but could not be accessed as long for measure- ment. Note the increased rate...

... short period of time. Accurate closure rates can usually be obtained with- in a period of 30 minutes to a few hours in most applications. The safety condition of a mine opening can be quickly assessed by simultaneously- measuring the microcreep room-closure rate at the center and the side of the opening...

... actLug ellipse and "r" r/ue distance frc t_he cenuar of caz ;auure, " r" radial stress and "6" closure rate (straLn). i Fig. 7 - Elli i l g f g Fig. 6 d Fig. 7, sio of ac li e c c t folly: b 4 (5) (6) From equation (2) the fl w at general distances a, r i and r k is: 2.' qS, k: 2rrrkL k...

... and they provide a practical solution to a practical problem. They are in-situ measurements which do not necessarily require laboratory correlation. Simple closure measurements have special significance in potash because "steady-state" § closure rate, or creep, of the entries is measured. These closure rates can...

... (or closure rates) of mined openings always decrease with time.3 In 1959, both ORNL and Serata (then at the University of Texas) installed several vertical and horizontal convergence measuring stations in the Carey Salt Company's mine at Hutchinson Kansas. Since that tñme ORNL has added additional stations...