This document discusses different rock excavation methods, including explosive blasting and chemical fissuring. It notes that explosive blasting uses different types of explosives suited for different rock types, with higher velocity blasts used to shatter sturdy rock and lower velocity explosives creating more gas pressure for softer rocks. The document also mentions other excavation techniques like using excavators, hydraulic hammers, jack drills, and notes precautions that should be taken like filling any irregularities before excavation.

1. ALL SITE DEVELOPMENTS
Different Rock Excavation
Methods
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2. ROCK
EXCAVATION
DISCUSSION OUTLINE
Rock excavation
contractors have dated
explosive or blast
methods for rock
excavation. Nowadays,
rock blasting uses various
explosives with different
types and performance
properties.

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4. ROCK EXCAVATION
METHODS
BRIEF BACKGROUND
Higher velocity blasts can be used for
relatively sturdy rock to shatter and
convert it into pieces. In contrast, soft rocks
use low-velocity explosives to create more
gas pressure and a more significant
heaving effect.

6. Procedure
for
Excavation
in
Rocks
The selection of technique and
equipment
Chemical rock fissuring can be
used for hazardous areas
Blasting & explosion, For more giant
areas, excavator mounted Hydraulic
hammers can be employed

7. Used for drilling shallow rocks
Used for loosened rocks
Jack driller
Excavator

8. PRECAUTIONS
Designers concerns should be taken
before deciding. Any over-excavation
or irregular foundation bottom shall
be filled with lean concrete before
rock excavation.