Rad Langston’sground controlmanual

7.Provide written answers to the following questions from Rad Langston’sground controlmanual:

a.What is the main idea thatgoverns support for anyunderground opening?

b.What two types of support combine together that builds the arch?

c.The mats or any surface support should be spaced no further apart than how many times the block length inthe rock mass?d.What is the general length of a rock bolt

(in relation to the width of the opening) needed in poor, moderate, and good ground?e.What is generally the maximum or peak size of a roof wedge failure(in relation to

the width of the opening)?

f.Why is it important to keep a bolting plan on a regular pattern?

g.Under what circumstances is it permissible to work under anunsupported roof?

Sample Solution