Mississauga Exchange District Condos | 232m | 72s | Camrost-Felcorp | Arcadis

The LRT will have a stop beside Cooksville GO.

That will be very time consuming and not many people will use it.

People from Milton will still drive instead of taking the train.

Either we add a spur line to Mississauga city center from Erindale station or find a way to connect to existing Milton line.

But Mississauga city center needs a GO Train stop.
 
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Oct 8
More up on site
No shoring for the site and being done like M City.

The area to the west of where the hole going and construction trailers are sitting will be a new street.
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One thing I don't get about excavation is, aren't there more efficient methods for it? Like for example using a drill machine to make several holes to break apart the rocks and then use a machine or crane to lift the big rocks out. Or a drill going horizontally to drill under and push out the rocks from under.

The way we usually do it seems so old school now like trying to dig it out by scratching it with a fork.
 
One thing I don't get about excavation is, aren't there more efficient methods for it? Like for example using a drill machine to make several holes to break apart the rocks and then use a machine or crane to lift the big rocks out. Or a drill going horizontally to drill under and push out the rocks from under.

The way we usually do it seems so old school now like trying to dig it out by scratching it with a fork.

You would think that by now there ought to be laser machines that just cut the rock into neat cubes 😁. However, I think it always boils down to what is the most cost effective method to do the job.
 
One thing I don't get about excavation is, aren't there more efficient methods for it? Like for example using a drill machine to make several holes to break apart the rocks and then use a machine or crane to lift the big rocks out. Or a drill going horizontally to drill under and push out the rocks from under.

The way we usually do it seems so old school now like trying to dig it out by scratching it with a fork.

The ability to excavate is limited by the nature of geology itself. There are two different types of layers we would be concerned with here - bedrock and regolith. Bedrock is most easily described as solid rock that has been compacted over millions of years, where porosity has been destroyed and fluids pushed out. Regolith is the soils that sit on top, which still retains moisture and porosity, as well as not being fully consolidated to the point of being considered truly solid. In the case of the GTA, the bedrock is composed of shale, which is highly fissile, meaning it has a tendency to split on its planes of stratification, causing it to break apart into small, flat pieces quite easily when being excavated. Essentially, most of the excavation is the removal of dirt and small pieces. You really can't do that more efficiently and more cost-effectively than using excavators and other manual equipment.

However, it is absolutely possible to cut certain types of bedrock into neat blocks. Limestone and granite are much stronger rocks that can be cut like this, but you only really see it in quarries where the rock is actively being mined. For dense granite or limestone that needs to be removed for construction, it is typically removed through blasting, because it is much faster and cheaper.
 
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The ability to excavate is limited by the nature of geology itself. There are two different types of layers we would be concerned with here - bedrock and regolith. Bedrock is most easily described as solid rock that has been compacted over millions of years, where porosity has been destroyed and fluids pushed out. Regolith is the soils that sit on top, which still retains moisture and porosity, as well as not being fully consolidated to the point of being considered truly solid. In the case of the GTA, the bedrock is composed of shale, which is highly fissile, meaning it has a tendency to split on its planes of stratification, causing it to break apart into small, flat pieces quite easily when being excavated. Essentially, most of the excavation is the removal of dirt and small pieces. You really can't do that more efficiently and more cost-effectively than using excavators and other manual equipment.

However, it is absolutely possible to cut certain types of bedrock into neat blocks. Limestone and granite are much stronger rocks that can be cut like this, but you only really see it in quarries where the rock is actively being mined. For dense granite or limestone that needs to be removed for construction, it is typically removed through blasting, because it is much faster and cheaper.
You can see a lot of evidence of drilling and blasting for the highways that have been built through the Canadian shield in northern Ontario.
 
It can be common in Ottawa as well - I believe they had to do rock blasting for the basement excavation at Mizrahi's 1451 Wellington Project there.
 

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