Question: A circular shaft liner is sunk to a depth of 3,750 ft (1,143 m). If the premining stress field is caused by gravity alone, what

A circular shaft liner is sunk to a depth of 3,750 ft (1,143 m). If the premining stress field is caused by gravity alone, what unconfined compressive rock strength in psi (MPa) is needed for a rock factor of safety of 3.0?

Step by Step Solution

★★★★★

3.35 Rating (170 Votes )

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock

Given and gravity preshaft stress field Find If rock safety factor ... 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 (121).docx

120 KBs Word File

Students Have Also Explored These Related Geological Engineering Questions!

If the premining stress state in Problem 16 where hydrostatic (3D), what shape would be more favorable, an ellipse, rectangle, or ovaloid (with semi-axes ratio of 2)?

If the premining stress state in Problem 18 where hydrostatic (3D), what shape would be more favorable, an ellipse, rectangle, or ovaloid (with semi-axes ratio of 2)?

A field test is conducted in an unconfined aquifer by pumping 1,300 ft 3/hr from an 8- inch diameter well penetrating the aquifer. The undisturbed aquifer thickness is 46 ft. The draw downs, measured...

An in situ stress field between 3,000 ft and 3,500 ft is fit to the formulas v = 1.125h, H = 3,500 + 0.33h, h = 3,500 + 0.33h where the stresses are in psi and the depth h is in ft. Stresses v, H, h...

A three-compartment rectangular shaft 12 24 ft in cross section is planned for a depth of 3,000 ft. The pre-sinking stress field is assumed to be caused by gravity only. The weakest rock along the...

A vertical unlined 22 ft diameter circular shaft is fitted with a concrete shaft liner to withstand water pressure of 123 psi in a massive sandstone aquifer at a depth of 2,890 ft. Liner properties...

An in situ stress field between 914 and 1,067 m is fit to the formulas v = 25.45h, H = 24,138 + 7.47h, h = 24,138 + 7.47h, where the stresses are in kPa and the depth h is in m. Stresses v, H, h are...

A circular concrete shaft liner with a Youngs modulus of 3.4 million psi, Poissons ratio of 0.25, unconfined compressive strength 3,500 psi and tensile strength 350 psi is considered for control of...

A circular concrete shaft liner with a Youngs modulus of 23.45GPa, Poissons ratio of 0.25, unconfined compressive strength 24.1 MPa, and tensile strength 2.41 MPa is considered for control of water...

A vertical circular shaft will pass through a water-bearing stratum at a depth of 2,780 ft where the water pressure is estimated to be 210 psi. Finished shaft diameter must be 18 ft. The pre-shaft...

A mass of 3 kg of saturated liquid-vapor mixture of water is contained in a piston-cylinder device at 160 kPa. Initially, 1 kg of the water is in the liquid phase and the rest is in the vapor phase....

AP Vianne is the management accountant for Divvy, a bike-sharing service in Chicago. She is trying to plan for summer activity by using the most recent ridership information provided. She needs to...

Explain and expand on the importance of motivating good manners in the workplace. Include aspects of etiquette with respect to the microwave and the fridge.

Natural gas containing a mixture of methane ethane propane and butane is burned in a furnace with excess air. (a) One hundred k mol/h of a gas containing 94.4 mole% methane, 3.40% ethane 0.60%...

PepsiCo, Inc. (PEP), the parent company of Frito-Lay¢ snack foods and Pepsi beverages, had the following current assets and current liabilities at the end of two recent years: a. Determine the...

In 2006, the Russ College of Engineering and Technology of Ohio University announced that an investigation had found rampant and flagrant plagiarism in the theses of mechanical engineering graduate...

Refer to the data given in Exercise 14-20. In Exercise 14-20 Phoenix Partners provides management consulting services to government and corporate clients. Phoenix has two support...

The following data were taken from the comparative balance sheet of Osborn Sisters Company for the years ended December 31, 20Y9 and December 31, 20Y8: a. Determine for each year (1) The working...

10.2 This is also Exercise 2.6. For each of the following statistical summaries, explain whether it is a population parameter or a sample statistic. a. A highway safety researcher wants to estimate...

Determine the power that is absorbed or supplied by the circuit elements shown. +10 V 2 A 2.A 1 A 24 2 14 V 18 12 2 A

Design a central annular-groove pressure-fed bearing with an l/d ratio of 0.5, using SAE grade 20 oil, the lubricant supplied at 30 psig. The exterior oil cooler can maintain the sump temperature at...

Repeat design problem Prob. 1218 using the nominal bushing bore B as one decision variable and the radial clearance c as the other. Again, Trumplers criteria to be used.

Please show work. Do not do in excel! Van Auken Lumbers 2013 financial statements are shown below. a. Assume that the company was operating at full capacity in 2013 with regard to all items except...

Walton Company currently produces and sells 6 , 7 0 0 units annually of a product that has a variable cost of $ 1 6 per unit and annual fixed costs of $ 2 3 9 , 6 0 0 . The company currently earns a...

XYZ is considering buying a new, high efficiency interception system. The new system would be purchased today for $50,000.00. It would be depreciated straight-line to $0 over 2 years. In 2 years, the...