Prescribe a bolting plan for entries driven 28 ft (8.5 m) wide in the lower coal seam
Question:
Prescribe a bolting plan for entries driven 28 ft (8.5 m) wide in the lower coal seam in the sketch using the dead weight load approach. Include nominal bolt diameter, length, grade of steel, installation tension, and spacing. Support your recommendation withcalculations.
Transcribed Image Text:
Rock type E-106 r-pcf (kNim?) Co-psi (Mpa) Topsi (Mpa) h-ft (m) psi (Gpa) I Over-burden 2 Massive Sandstone 1694 (516) 1714 (522) 1.70 (I1.7) 3.00 (20.7) 50 (0.34) 850 (5.86) I44.0 (22.8) 148.2 (23.4) 0.25 1,000 (6.9) 19,000 (131.0) 0.20 3 Coal 4 Layered sandstone 5 Massive sandstone 6 Sandy shale 7 Coal 8 Massive sandstone 75.0 (11.9) 0.30 3,500 (24.I) 149.5 (23.6) 1.50 (10.3) 0.10 17,500 (120.7) 700 (4.83) 0.35 (2.4) 130 (0.90) 1719 (524) 1741 (531) 1744 (532) 148.2 (23.4) 3.00 (20.7) 0.20 19,000 (131.0) 850 (5.86) 170.0 (26.9) 75.0 (11.9) 148.2 (23.4) 4.50 (31.0) 0.35 (2.4) 3.50 (24.1) 0.10 0.30 15,000 (103.4) 3,500 (24.1) 19,500 (134.5) 1,000 (6.90) 1,300 (8.97) 1,000 (6.90) 1747 (533) 1754 (535) 1778 (542) 0.20 9 Layered sandstone 2250 (658) 149.5 (23.6) 1.50 (10.3) 0.10 17,500 (120.7) 700 (4.83)
Fantastic news! We've Found the answer you've been seeking!
Step by Step Answer:
Answer rating: 38% (13 reviews)
Given Sketch data Wo28 ft lower seam Find Using dead weight load approach a bolting p...View the full answer
Answered By
Nazrin Ziad
I am a post graduate in Zoology with specialization in Entomology.I also have a Bachelor degree in Education.I posess more than 10 years of teaching as well as tutoring experience.I have done a project on histopathological analysis on alcohol treated liver of Albino Mice.
I can deal with every field under Biology from basic to advanced level.I can also guide you for your project works related to biological subjects other than tutoring.You can also seek my help for cracking competitive exams with biology as one of the subjects.
3.30+
2+ Reviews
10+ Question Solved
Related Book For
Question Posted:
Students also viewed these Geological Engineering questions
-
A steel cable with nominal diameter 25 mm (see Table 2-1) is used in a construction yard to lift a bridge section weighing 38 kN, as shown in the figure. The cable has an effective modulus of...
-
A in-16 UNF series SAE grade 5 bolt has a -in ID tube 13 in long, clamped between washer faces of bolt and nut by turning the nut snug and adding one-third of a turn. The tube OD is the washer-face...
-
A 7 ft m tall steel cylinder has a cross sectional area of 15 ft2. At the bottom with a height of 2 ft m is liquid water on top of which is a 4 ft high layer of gasoline. The gasoline surface is...
-
The following rates are observed on the yield curve: 6-month 0.5%, 12-month 1.5%, 18-month 2%, 24-month 3%. You hold a portfolio with four semi-annual coupon bonds, all with a par-value of $1,000 and...
-
In Problem 73, what should be the angle between the transmission axes of the polarizers if it is desired that one-tenth of the incident intensity be transmitted? In Problem 73 Unpolarized light...
-
An important unit consists of two components placed in parallel. The unit performs satisfactorily if one of the two components is operating. Therefore, only one component is operated at a time, but...
-
What is the difference between a cause of action and an affirmative defense?
-
Jack asked Jill to marry him, and she has accepted under one condition: Jack must buy her a new $330,000 Rolls-Royce Phantom. Jack currently has $45,530 that he may invest. He has found a mutual fund...
-
Global Pistons ( GP ) has common stock with a market value of $ 2 7 0 million and debt with a value of $ 1 7 0 million. Investors expect a 1 6 % return on the stock and a 7 % return on the debt....
-
You are meeting with a client and they tell you data observability is not a priority right now. You ask them if they are scaling their data platform, and they say yes. What question should you follow...
-
Given the geologic column, strata depths and rock properties in Table 5.8, find: (a) The maximum possible roof span when mining the lower coal seam full height, (b) The safe roof span, if a safety...
-
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...
-
If f(x) = (1 + x 3 ) 30 , what is f (58) (0)?
-
How do common stock investors usually receive returns?
-
a. What is meant by risk/return trade-off? b. Does this trade-off hold in all markets?
-
a What is the efficient markets hypothesis (EMH)? b. What are its implications for investors and managers?
-
Explain the concept of return on investment (ROI) and the two different approaches to measuring it.
-
What is the general approach for valuing a share of stock of a dividend-paying company?
-
For the class project (or a project of your choosing), consider how the Scrum approach would be applicable (or not) to the project. Create a list of eight points as to why you believe Scrum 'would'...
-
If your school has a subscription to the FASB Codification, go to aaahq.org/ ascLogin.cfm to log in and prepare responses to the following. (a) What is the stock dividend? (b) What is a stock split?...
-
Describe a situation in which heat transfer occurs. What are the resulting forms of energy?
-
Find 1/0 in the network shown. 10 k 12 W
-
Find 10 in the network shown. 10 k 12 W
-
In testing the wear life of gear teeth, the gears are assembled by using a pretorsion. In this way, a large torque can exist even though the power input to the tester is small. The arrangement shown...
-
A horsepower is 550 ft-lb/s. A watt is 1 N-m/s. Determine how many watts are generated by the engines of the passenger jet if they are producing 7000 horsepower.
-
Draw an ice cream cone by drawing on a single set of coordinates the portion of the sphere above the height of the circle in (a) and the portion of the cone above the xy-plane and below the height of...
-
Given that a transaction is a financial event that requires changing the statement of financial position, decide whether or not each of the following (on this page and the next) is a transaction. You...
Study smarter with the SolutionInn App