Q4: Diagonal cracks were observed in the walls of an existing building. It had been noticed that at a nearby construction site, deep wells were used to dewater this construction site. Using neat sketches, explain the effect of the dewatering at the construction site on the existing structure. Explain the meaning of appearance of diagonal cracks. Q5: Using neat sketches, briefly explain the function of Sand Drains when used in combination with preloading method for soil improvement. Q6: Using neat sketches, briefly compare between compaction grouting and jet grouting