Question: 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

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 weight = 156pcf. A joint set of variable dip pervades the mine. Mohr–Coulomb properties are: c = 630 psi, 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

★★★★★

3.30 Rating (165 Votes )

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock

Given Room and pillar limestone mine depth845 ft Joints c630 psi p40 Hp95 ft Co21500 ... 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 (284).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 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 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...

An aquarium 5 ft long, 2 ft wide, and 3 ft deep is full of water. Find (a) The hydrostatic pressure on the bottom of the aquarium, (b) The hydrostatic force on the bottom, and (c) The hydrostatic...

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...

Explain whether the following function is convex, concave , or neither convex nor concave:f(x, y) = 5x^2-log(1+2y) don f ={x,y/ y>-0.5}

As a loan officer for FIFO, Alan's job is to sell loans that generate revenues for the company. Alan has been charged with increasing the total amount of mortgages sold by FIFO. One of the loans FIFO...

E6.21 (LO 5) (Transfer of Receivables) Use the information for Grant AG as presented in E6.20. Grant is planning to factor some accounts receivable at the end of the year. Accounts totaling 10,000...

Mikey W. Smitty, an emerging rapper, is getting ready to cut his first CD, called Western Rap. The cost of recording the CD is $5000 but copies are $5 apiece. If the CDs can be sold for $15 each, how...

At a recent meeting, it was decided to go ahead with the introduction of a new product if interested consumers would be willing, on average, to pay $20.00 for the product. A study was conducted, with...

Your factorys inventory level was determined at 12 randomly selected times last year, with the following results: a. Find the typical inventory level throughout the whole year, using the standard...

Some of your advertisements seem to get no reaction, as though they are being ignored by the public. You have arranged for a study to measure the publics awareness of your brand before and after...

Dawn Corporation sold $400,000 of 9 percent, 10-year bonds for face value on September 1, 2014. The issue date of the bonds was May 1, 2014. The companys fiscal year ends on December 31, and this is...

A hand-driven tire pump has a piston with a 2.50-cm diameter and a maximum stroke of 30.0 cm. (a) How much work do you do in one stroke if the average gauge pressure is 2.40 x 10 5 N/m 2 (about 35...

Use loop analysis to find Vo in the network shown. 1 1 12V 4mA

Find Vo in the network shown. 4mA mA. 2KO 1 1 TmA

Find Vo in the circuit shown. 1 2 4mA

What is the output of this Java program? class Driver { public static void main ( String [ ] args ) { int a = 2 6 ; int b = 0 ; for ( int c = 5 ; c 3 ; c - - ) { b = 5 ; while b = b - 1 ; a = a + b ;...

Powers Company has the following account balances: Purchases $99.000 2 points Sales Returns and Allowances 12.800 Purchase Discounts 8.000 Freight-in 6,000 Delivery Expense 8.000 The cost of goods...

(Part 1) Your friend Alan manages a coffee shop and has gathered the following information. During the opening hours (8:00 am to 5:00 pm, Monday to Sunday), customers arrive at a rate of eleven per...