Question: Laboratory tests on core from exploration drilling show that Co = 21,500 psi, To = 1,530, E = 6.25(106) psi, G = 2.5(106) psi,

Laboratory tests on core from exploration drilling show that

Co = 21,500 psi, To = 1,530, E = 6.25(106) psi,

G = 2.5(106) psi, γ = 144pcf, while premining stress measurements can be fit to the formulas SE = 200 + 0.3h, SN = 600 + 0.9h, SV = 1.1h, where E,N, V refer to compass coordinates (x=east, y=north, z =up), stress is in kPa, depth h is in m, and compression is positive.

Premining shear stresses are nil relative to compass coordinates. Suppose a rectangular a 12 × 24 ft rectangular shaft is selected and for some reason is oriented with the long axis N30W. Find the resulting factors of safety at 2,150 ft.

Step by Step Solution

★★★★★

3.22 Rating (163 Votes )

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock

Given Rectangular shaft 12 x 24 ft N30W depth2150 ft Find FSs S... 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 (108).docx

120 KBs Word File

Students Have Also Explored These Related Geological Engineering Questions!

Laboratory tests on core from exploration drilling show that Co = 148.3 MPa, To = 10.55 MPa, E = 43.10GPa, G = 17.24GPa, = 22.78kN/m3, while premining stress measurements can be fit to the formulas...

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 rectangular channel with n = 0.012 is 5 ft wide and is built on a slope of 0.0006 ft/ft. At point a, the flow rate is 60 cfs and ya = 3 ft. Using one reach, find the distance to point b where yb =...

A 6 m diameter circular shaft is planned in massive rock. Laboratory tests on core from exploration drilling show that Co = 152 MPa To = 8.3MPa = 23kN/m3 E = 34.5GPa G = 13.8GPa Depth is 915 m. Site...

A 20 foot diameter circular shaft is planned in a massive rock. Laboratory tests on core from exploration drilling show that C o = 22,000 psi T o = 1,200 psi = 144pcf E = 5 10 6 psi G = 2.0 10 6...

A large vertical shaft is planned for an underground hard rock mine. Laboratory tests on core from exploration drilling show that Co = 21,500 psi, To = 1,530 psi, E = 6.25(106) psi, G = 2.5(106) psi,...

A regular room and pillar method is used in a hard rock leadzinc mine. The ore horizon is at a depth of 360 m where the overburden averages 25.2kN/m3. Laboratory tests on core samples (L/D = 2) show...

A regular room and pillar method is used in a hard rock leadzinc mine. The ore horizon is at a depth of 1,180 ft where the overburden averages 159pcf. Laboratory tests on core samples (L/D = 2) show...

A regular room and pillar method is used in a hard rock leadzinc mine. The ore horizon is at a depth of 980 ft where the overburden averages 156pcf. Laboratory tests on core samples (L/D = 2) show...

A regular room and pillar method is used in a hard rock leadzinc mine. The ore horizon is at a depth of 300 m where the overburden averages 25kN/ms. Laboratory tests on core samples (L/D = 2) show...

As early as in 1974, in his book Who Shall Live?, the well-known US health economist Victor Fuchs pointed out that: Select one: O a. Also in the health sphere it is necessary to choose. O b. Health...

The reduction product of citral with Na(Hg)/Alcohol is : A) p-Cymene B) Geraniol C) Geranic acid D) Levulinic acid On reduction, citral gives geraniol.

The following table shows annual rates for various type Loan Type 3 0 - Year Mortgage 1 5 - Year MortgageNew Car LoanUsed Car LoanCredit CardsRate 3 . 0 3 % 2 . 3 0 % 9 . 2 0 % 9 . 4 5 % 1 3 . 9 9 %...

Indicate with an "X" in which columns, Income Statement Debit or Credit or Balance Sheet Debit or Credit, a net income or a net loss would appear on a worksheet. Balance Sheet Debit Credit Income...

Indicate with an "X" whether each account total should be extended to the Income Statement Debit or Credit or to the Balance Sheet Debit or Credit columns on the worksheet. Income Statement Debit...

From the adjustments columns in Exercise 5-9A, journalize the four adjusting entries, as of December 31, in proper general journal format. Exercise 5-9A Jim Jacobs Furniture Repair Work Sheet...

At the beginning of the current year, Willow Company adopts a pension plan and awards retroactive benefits to its employees. The company's actuary computes these prior service costs to be $280,000....

On June 1, 20--, a depreciable asset was acquired for $5,400. The asset has an estimated useful life of five years (60 months) and no salvage value . Using the straight-line depreciation method,...

The Alpha Corporation is considering investing in a riskless project costing $100. The project receives $107 in one year and has no other cash flows. The discount rate on riskless investments is 2...

A four-strand no. 40 roller chain transmits power from a 21-tooth driving sprocket to an 84-tooth driven sprocket. The angular speed of the driving sprocket is 2000 rev/min. (a) Estimate the chain...

A 700 rev/min 25-hp squirrel-cage induction motor is to drive a two-cylinder reciprocating pump, out-of-doors under a shed. A service factor Ks of 1.5 and a design factor of 1.1 are appropriate. The...

A centrifugal pump is driven by a 50-hp synchronous motor at a speed of 1800 rev/min. The pump is to operate at 900 rev/min. Despite the speed, the load is smooth (Ks = 1.2). For a design factor of...

Company A, a British manufacturer, wishes to borrow U.S. dollars at a fixed rate of interest. Company B, a U.S. multinational, wishes to borrow sterling at a fixed rate of interest. They have been...

PLEASE HELP. NEED STANDARD DEVIATION AND THE AVERAGE REAL RETURN.

5. As Treasurer, you are responsible for ensuring adequate funding of trading activity. Therefore new deals require your approval before traders execute. Currently, you have funding capacity of S100...