Question: With reference to Problems 19 and 20, suppose the pillars are 9 9 m and that a size effect exists such that Cp =

With reference to Problems 19 and 20, suppose the pillars are 9 × 9 m and that a size effect exists such that Cp = C1 (0.78 + 0.22Wp/Hp). If the mining height changes from 8 to 27 m as a sill between two ore horizons is removed, what is the resulting pillar safety factor, all other parameters remaining the same? What is the pillar safety factor if the size effect is neglected?

Step by Step Solution

★★★★★

3.30 Rating (171 Votes )

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock

Given Problems 19 20 data pillars 9x9m Cp C 078 022 WpHp Hp 1 8 m ... 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 (256).docx

120 KBs Word File

Students Have Also Explored These Related Geological Engineering Questions!

With reference to Problems 5 and 6, suppose the pillars are 13.7 13.7 m and that a size effect exists such that Cp = C1 (0.78 + 0.22Wp/Hp). If the mining height changes from 9.14 to 36.6 m, as a...

With reference to Problems 1 and 2, suppose the pillars are 45 45 ft and that a size effect exists such that Cp = C1 (0.78 + 0.22 Wp/Hp). If the mining height changes from 30 to 120 ft, as a sill...

With reference to Problems 6.15 and 6.16, suppose the pillars are 3030 ft and that a size effect exists such that Cp = C1 (0.78+0.22 Wp/Hp). If the mining height changes from 25 to 90 ft as a sill...

PowerPoint Assignment for BUS 401: Principles of Finance You have been asked by a manager in your organization to put together a training program explaining Net Present Value (NPV) and Future Value...

Please help me with the attached article review. I have attached the instructions as well as the scholarly article to use. The topic is Time Value of Money Analysis. Time value of money analysis...

Requested to do an integrated summary of these paper by reflecting to the local (Malaysian) Corporate Financial Scenarios. Three views on stock markets and corporate behavior: Tobin, Veblen, and Marx...

Briefly describe ASCII and Unicode and draw attention to any relationship between them. [3 marks] (b) Briefly explain what a Reader is in the context of reading characters from data. [3 marks] A...

Hello, I havetwo articles about S Corp. and C Corp., and IJUST need towrite a conclusion paragraph based on professor's questions. can you help me to write it? Articles are attached Accounting...

1 2 3 4 7 8 9 12 13 14 15 16 17 18 19 20 21 22 23 24 28 29 30 31 38 40 41 44 47 48 49 50 51 62 63 64 66 67 68 69 70 71 73 74 76 77 78 79 80 81 82 85 86 87 88 89 90 91 92 93 94 95 99 100 101 104 105...

4. Which of the following items cannot be found on a firmsbalance sheet under current liabilities? a. Accounts payable. b. Short-term notes payable to the bank. c. Accrued wages. d. Cost of goods...

On January 1, 2013, the Taylor Company adopted the dollar-value LIFO method. The inventory value for its one inventory pool on this date was $400,000. Inventory data for 2013 through 2015 are as...

A local government was awarded a federal grant in the amount of $ 1 , 2 0 0 , 0 0 0 to provide for a summer employment program for young people. The grant was a reimbursement grant and was awarded on...

Consider the markets for DVDs, TV screens, and tickets at movie theaters. a. For each pair, identify whether they are complements or substitutes: DVDs and TV screens DVDs and movie tickets TV...

Recording Capital Projects Fund Transactions. In Erikus County, the Parks and Recreation Department constructed a library in one of the countys high growth areas. The construction was funded by a...

Flexible spending accounts (FSA) allow employees to set aside a portion of their earnings to be used for approved medical expenses. The major advantage of an FSA is that the funds are not subject to...

The audit assistant has been assigned to review performance indicators in the purchasing department of Kentucky Kapers, a manufacturing audit client. The assistant reports to you that he has obtained...

Securimax Limited (Securimax) has been an audit client of KFP Partners (KFP) for the past 15 years. Securimax is based in Waterloo, Ontario, where it manufactures high-tech armour-plated personnel...

A 4-ton air conditioner removes 5.06 x 10 7 J (48,000 British thermal units) from a cold environment in 1.00 h. (a) What energy input in joules is necessary to do this if the air conditioner has an...

Find the voltage Vo in the network shown. 1 kQ 2 kQ 24 mA 6 kQ 3 kQ 6 kQ 12 kQ

Find the current Io in the circuit shown. 3 kQ 4 kQ 12 ka 12 V 6 kQ 6 kQ 6 kQ 3 kQ

Find I0 in the circuit using nodal analysis. 10kQ 12kQ 6kQ 6 mA Io

The following reaction is assumed to take place in a membrane reactor: A B + 2C Pure A enters the reactor and B diffuses through the membrane. Unfortunately, some of the reactant A also diffuses...

can anyone solve this? @(a) Five distinct integers are to be chosen from the set {1, 2, 3, 4, 5, 6, 7, 8} and placed in some order in the top row of boxes in the diagram. Each box that is not in the...

Assume that the heights of American men are normally distributed with a mean of 68.0 inches and a standard deviation of 2.4 inches. The U.S. Marine Corps requires that men have heights between 63 and...