Question

The ratio of the specific weight of an intact rock to that of loose rock is

• A. Fill factor
• B. Loose density
• C. Swell factor
• D. Compaction factor

Hint:

Excavated rock occupies more volume than intact rock. Hence, \[ \boxed{ \text{Swell Factor} = \frac{\gamma_{\text{intact}}}{\gamma_{\text{loose}}}>1. } \]

Answer 1

The Correct Option is C

Step 1: Recall the definition of swell factor. When rock is excavated, its volume increases and its unit weight decreases due to loosening. The swell factor is defined as the ratio of the specific weight (unit weight) of intact rock to that of loose rock. \[ \boxed{ \text{Swell Factor} = \frac{\gamma_{\text{intact}}} {\gamma_{\text{loose}}} } \] where \[ \gamma_{\text{intact}}=\text{Specific weight of intact rock}, \] and \[ \gamma_{\text{loose}}=\text{Specific weight of loose rock}. \]

Step 2: Identify the correct option. Hence, \[ \boxed{\text{Swell factor}} \] is the correct answer. Therefore, \[ \boxed{(C)} \] is the correct answer.