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Tunnel excavating process calculation

posted Jan 21, 2014, 3:35 AM by HRD Tech   [ updated Feb 20, 2019, 1:20 AM ]
This page shows how to excavate tunnels by various equipment. You will know which procedure HRD Rock Splitter is applied in. 

There are 3 procedures ; Drilling, splitting, breaking.  

three-boom-jumbo-drilling-rigs image
Hydraulic-Rock-Splitter image
rock-breaker image














  3 boom jumbo drilling rigs                   Hydraulic Rock Splitter                                     Rock Breaker

Let's suppose that conditions are like as below, 

1. Tunnel Size              : around 80m²
2. Mountain material     : 80% Rocks
3. Equipment               : 3 boom jumbo drilling rigs - 1 vehicle
                                   Hydraulic Rock Splitter       - 3 sets     (95mm diameter split rod)
                                   Rock Breaker                     - 1 vehicle

And I calculate and get the result; how long it will take to get 3 meters tunnel (around 240m³).


Tunnel excavating drawing 1
Pic 1) TUNNEL SIZE 
10m height, 9m width tunnel should be made under rock mountain.

Tunnel excavating drawing 2
Pic 2) MAKING HOLES ON HEADING SECTION
We have to make 210 holes (105 mm diameter,  3 meters depth) on heading section by 3 booms jumbo drilling rigs. Holes should be located on every 500 mm square. It takes about 3 minutes to make 3 meter depth hole.

Tunnel excavating drawing 3
Pic 3) AFTER SPLITTING AND BREAKING IN HEADING SECTION
Above picture shows after 3 sets hydraulic rock splitters and a rock breaker getting 3 meters tunnel on heading section.
At one time, 18 split rods can make cracks on the rock during 6 minutes, and rock breaker can make above space in 2 hours.

Tunnel excavating drawing 4
Pic 4) MAKING VERTICAL HOLES ON BENCHING SECTION AND SAME PROCEDURE
Vertical holes should be made 114 EA on benching section. In same procedure, splitting and breaking is followed. 
Since benching section is 5 meter high, so drilling, splitting and breaking procedure should be done 2 times.

RESULT 

Time to make 3 meters tunnel is ;

1) Heading section 
    Drilling   : 210 minutes
    Splitting :  70 minutes x 3 times (Hole depth is 3 meter, but split rod length is 750 mm)
    Breaking : 120 minutes

Sub Total   :  590 minutes

2) Benching section           
    Drilling    : 114 minutes x 2 times (bench height is 5 meter)
    Splitting  :   38 minutes x 5 times 
    Breaking  : 120 minutes

Sub Total    : 538 minutes

Total : 1,128 minutes = 18 hours 48 minutes

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