There are a number of mines analyzing the possibility of doing the transition from open pit to underground, underground to open pit, or extending the production and having both mining methods working at the same time. In each case at some point in time during the transition or when both mining methods are in place, there will be an interaction between surface and underground workings. This may prove to be beneficial to the underground operation, by helping the rock to cave and relieving the concentrated stresses surrounding the rock mass in the underground. On the other hand, it may create unwanted effects in the pit, producing instability in the areas closer to the underground operation, deteriorating the haulage roads, and generating slope failures and unsafe working conditions. Understanding the general effects of the interaction between both mining methods at a two-dimensional level is an important start-up point to study mine planning options, time schedules, and proposed designs before going into a more detailed and time consuming three-dimensional modeling. The software Phase2 was used to simulate the interaction of a subsidence cave with broken material generated from an underground project lying underneath and an open pit project that is being developed in surface. Different stages were used to create a time line for the planned advance of the underground mine, and the open pit evolution.

There are a number of mines that at some point in the future will have to decide to change from open pit to underground or vice versa. The optimal setting for mines with this requirement is to have a successful interaction between both mining methods, and to supply a continuous or if possible an even higher production from the mine. The sample model used includes a section with broken material representing a subsidence cave that is close to the lower wall of the open pit, plus an active caving underground project interacting with the developing open pit on the surface. The finite element package Phase2 from Rocscience was used to simulate the interaction between the two mining methods.

Gta Vice City Underground Download Utorrent

Download File 🔥 https://geags.com/2yg5zo 🔥

The underground and open pit evolution were represented in Phase2 by using 34 different stages. As the underground project is evolving, the original rock type changes from the in-situ central rock type to broken rock. Rock areas were defined using material boundaries, and stage boundaries were defined for the changes from existing rock to excavated or broken material. As the open pit progressed, the rock type was changed at different material stages from the host rock to excavated rock, and the underground project rock type was changed from host rock to broken rock material. A broken material accumulation from previous mining, which influenced the lower wall of the open pit, was placed at the beginning of the simulation and remained through the 34 stages of the project. The main project settings used in Phase2 are presented in Table 1 and the rock types used are presented in Tables 2, 3, and 4.

Purpose: The purpose of the interactive forum, sponsored by the Mine Safety and Health Administration and the Office of Surface Mining, will be to evaluate the applicability and effectiveness of available geophysical technologies for detecting, locating, and delineating active and inactive underground coal mine workings.

Registration and Lodging: The registration fee of $150 includes continental breaks, lunches, receptions, and proceedings on CD-ROM. The headquarter hotel is the Hyatt Regency Lexington (www.lexington.hyatt.com), and is located at 400 West Vine Street in downtown, Lexington. A block of rooms has been reserved until June 28 for $65 single and $90 double (plus 12.4% tax). Please contact the Hyatt Regency directly at 859-253-1234 or 800-233-1234 and ask for the room block for the "Coal Mine Voids Forum." Reservations after June 28 will be accepted on a space-available basis only. The Hyatt Regency has shuttle service to and from Bluegrass Airport, with a courtesy phone available at the airport. For other local hotel information, contact Geaunita Caylor at 859-257-2820 (gcaylor@engr.uky.edu), or go to: www.visitlex.com. 589ccfa754

Automatic Cable Manager 12 3 Acm

K7 antivirus one year free download

Live TV v1.82 [Ad-Free] [Latest]