Question: Consider an underground limestone mine in flat strata where pillars are 29 m high and depth is 258 m. Rock properties are: E = 77.9GPa,

Consider an underground limestone mine in flat strata where pillars are 29 m high and depth is 258 m. Rock properties are: E = 77.9GPa, v = 0.20, Co = 148 MPa, To = 11.6 MPa, unit weight = 24.7kN/m3. A joint set of variable dip pervades the mine. Mohr–Coulomb properties are: c = 4.34 MPa, φ = 40◦. Pillars must have a safety factor of 2.5 with respect to any potential failure mechanism. Is this possible? Show why or why not.

Step by Step Solution

★★★★★

3.36 Rating (168 Votes )

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock

Given Room of pillar limestone mine Hp 29m h258 m depth Rock E 779 GPa v020 ... View full answer

Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock

Step: 3 Unlock

Document Format (1 attachment)

26-E-G-R (285).docx

120 KBs Word File

Students Have Also Explored These Related Geological Engineering Questions!

Consider an underground limestone mine in flat strata where pillars are 95 ft high and depth is 845 ft. Rock properties are: E = 11.3 million psi, v = 0.20, Co = 21, 500 psi, To = 1, 680 psi, unit...

A 2 m by 2 m flat plate solar collector for domestic hot water heating is shown schematically in the sketch. Solar radiation at a rate of 750 W/m2 is incident on the glass cover which transmits 90%...

A multilevel room and pillar metal mine is under consideration in flat strata striking N60E. Entries are planned on strike, crosscuts up, and down dip. Table 6.6 shows depths and material properties...

A multilevel room and pillar metal mine is under consideration in flat strata striking N60E. Entries are planned on strike, crosscuts up, and down dip. Table 6.8 shows depths and material properties...

Consider gravity loading only under complete lateral restraint in flat strata with properties given in Table 1.2. Vertical stress at the top of the geologic column given in Table 1.2 is 1,000 psi....

Consider gravity loading only under complete lateral restraint in flat strata with properties given in table. Vertical stress at the top of the geologic column given in table is 6 . 9 MPa....

Write the critical review of the article below: Contents lists available at ScienceDirect Resources Policy journal homepage: www.elsevier.com/locate/resourpol Environmentally sustainable mining: The...

Contents lists available at ScienceDirect Resources Policy journal homepage: www.elsevier.com/locate/resourpol Environmentally sustainable mining: The case of tailings storage facilities Erica...

read case seven entitled "the Upper Big Branch Mine Disaster" at page 500 of your book and discuss the costs and benefits to stakeholder of the action taken by Massey Ebergy and its managers. The...

The Upper Big Branch Mine Disaster On Monday, April 5, 2010. just before 3:00 in the afternoon, miners at Massey Energy Corporation's Upper Big Branch coal mine in southern West Virginia were in the...

An investment offers $ 4,900 per year for 15 years, with the first payment occurring one year from now. If the required return is 8 percent, what is the value of the investment? What would the value...

Dick Gaines owns and operates Gaines Print Co. During February, Gaines Print Co. incurred the following costs in acquiring two printing presses. One printing press was new, and the other was used by...

Which of the following is the final audit that, if you pass, gives you CMMI certification? (a) SCAMPI B (b) SCAMPI C (c) SCAMPI A (d) Shrimp SCAMPI

On March 1, 2014, Smart Way Freight Company sold $200,000 of its 9.5 percent, 20-year bonds at 106. The semiannual interest payment dates are March 1 and September 1. The market interest rate is 8.9...

Evergreen Corporation has $2,000,000 of 6 percent bonds outstanding. There is $40,000 of unamortized discount remaining on the bonds after the March 1, 2014, semiannual interest payment. The bonds...

Hagler Corporation purchased a building by signing a $150,000 long-term mortgage with monthly payments of $1,200. The mortgage carries an interest rate of 8 percent per year. Prepare a monthly...

Below are the financial statements for two firms, Time Warner and Walt Disney, for 2012 and 2013. a. How did Time Warner's profit margins change from 2012 to 2013? To what would you attribute the...

Using the data from Exercise 6.18, compute the equivalent units of production for each of the four departments using the FIFO method. In exercise The following data are for four independent...

Calculate the net work output of a heat engine following path ABCDA in the figure below. P (106 N/m) 2.6 2.0 1.0 0.6 A D 1.0 B C 4.0 V (10- m)

A ductile hot-rolled steel bar has a minimum yield strength in tension and compression of 50 kpsi. Using the distortion-energy and maximum-shear-stress theories determine the factors of safety for...

Find Io in the circuit shown. 4 6V 2 lmA mla

Use loop analysis to find Vo in the network shown. 21

A trader creates a long butterfly spread from options with strike prices of $60, $65, and $70 per share by trading a total of 40 option contracts (10 contracts at $60,20 contracts at $65 and 10...

You must evaluate a proposed spectrometer for the R&D department. The base price is $170,000, and it would cost another $34,000 to modify the equipment for special use by the firm. The equipment...

The division manufactures chalcedony ornaments in a single manufacturing facility. Following is pertinent data for 2005, its first year of operations (hence, there is no beginning inventory). Annual...