3. Rock Mechanics
Ground Support — Quiz
Test your understanding of ground support with 5 practice questions.
Practice Questions
Question 1
When designing ground support for a highly fractured rock mass, which of the following rock mass classification systems is most commonly used to determine the appropriate support requirements?
Question 2
Which type of ground support system is specifically designed to accommodate large deformations in squeezing ground conditions without significant loss of load-carrying capacity?
Question 3
Consider a tunnel with a span of $6 \text{ m}$ in a rock mass requiring a support pressure of $150 \text{ kPa}$. If fully grouted rock bolts are installed in a square pattern with a spacing of $1.5 \text{ m}$, what is the approximate axial load ($P$) that each rock bolt must be designed to carry, assuming uniform load distribution?
Question 4
Which of the following monitoring instruments is most suitable for detecting the onset of rock mass dilation and potential instability in the immediate vicinity of an excavation boundary?
Question 5
In the design of ground support, the concept of 'stand-up time' is crucial. Which of the following factors has the most significant influence on the stand-up time of an unsupported excavation?