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Old January 3rd, 2016, 04:40 AM   #581
y2koh
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I don't see any issue with deep tunnelling across the nature reserve. Any tunnel below the depth of 40m below the ground level would have almost zero impact on the soil, and if managed properly, even ground water conditions will not be affected at all. With forward probing technology integrated with tunnelling, measures can be taken to reduce problems and impact when encountering any adverse undergound soil and rock conditions, without requiring any SI works on the ground level at all.

An elevated line will have a lot more impact on the environment, temporary roads have to be built to move heavy machinery to the construction site of the columns. Beams and bridge sections have to lifted along the entire stretch, requiring trees to be cleared. Huge foundations required for the bridge columns will also affect the soil and ground water conditions. Trees that may grow up to 60m, above the level of the bridge deck will have to be trimmed or even cut down to ensure operational safety.

If a cross island line is deemed to be critical, I do not see costs as a main consideration. Unless the system can allow trains to travel at up to twice the speed (140km/h) skirting along the edge of the CCNR, without placing any stations in between, and prove that it can be cheaper and have less environmental and real estate impact, cutting through the CCNR underground is the obvious way to go. For comparison sake, the 7km South Island line which includes a deep tunnelling section, costs HKD15.2billion (SGD2.5billion).
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Old January 3rd, 2016, 04:37 PM   #582
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Quote:
Originally Posted by pioneerboy View Post
Actually, for the section at Nature Reserve, I think it is better for the line to be elevated.

This is because elevated viaducts, as compared to underground tunnels, has less impact on the soil.

Underground tunnels, when the tunnel-boring machine bores through the soil, break the roots of the plants above... this is especially when the line is near the MacRitchie Reservoir.

Elevated viaducts only use the soil a little, for the pillars to go inside. Even if they excavate deep deep to plant the pillars firmly to the ground, the amount of soil they use in total could be less than the amount of soil they use if they were to bore underground.

If we have elevated viaducts running through the Nature Reserve, we could build walls beside and above the viaducts, to prevent collision with animals...

If the government has the money (around S$5.9 billion), we could use suspension bridge, to minimize the use of soil even further... it is only up to 1.6 kilometers across the Nature Reserve... it may be possible to plant pillars at the two ends at the golf courses, and build a suspension bridge across the nature reserve, without using the soil at the Nature Reserve at all... we could even build a bridge that goes over the topmost layer, since the trees are not that tall anyway...



I do not know how much money it costs to bore tunnels...

It may be better, financially and environmentally, to let the line run along the boundary of the Nature Reserve, outside the Nature Reserve.



The line can skip DTL King Albert Park station, for a smoother curve...

I do not know.

I don't you where you got that idea from :L that'd be the opposite of preserving the rainforest lol. It'd send all the environmentalists into a tizzy and they'd probably commit suicide in protest outside LTA's office.
A train line physically cutting through the thick of the forest would require immense destruction of the flora and fauna, and the suspension bridge idea wouldn't work here because there's no way the government or the public will be able to justify building a humongously expensive suspension bridge in the middle of nowhere just to serve one MRT line.

Underground is the way to go. Tunnel deep enough, like mine into the bedrock or something so that the topsoil won't be affected and the rainforest will just continue to tick as it always does.
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Old January 5th, 2016, 04:15 PM   #583
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I wish they would include a vehicular road as a shortcut to the west.
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Old January 5th, 2016, 04:24 PM   #584
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Hmmm. Could they possibly deep tunnel a road at the same time?
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Old January 5th, 2016, 04:27 PM   #585
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Theoretically they could have a single-bore tunnel - two CRL tracks on the lower level and a roadway above - but don't we already have the ORRS for that? And then the talk of realigning Lornie Road?
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Old January 5th, 2016, 06:03 PM   #586
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Quote:
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I wish they would include a vehicular road as a shortcut to the west.
then they would have flattened Bukit Brown for nothing
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Old January 29th, 2016, 08:12 PM   #587
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Drove along Punggol Central a few days ago and saw SI rigs along these locations. Most probably they are for the CRL as I am not sure what other infrastructure will run under that road.
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Old January 30th, 2016, 06:26 AM   #588
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Quote:
Originally Posted by luacstjh98 View Post
Theoretically they could have a single-bore tunnel - two CRL tracks on the lower level and a roadway above
The bore diameter to put a roadway above the CRL would require one of the largest TBMs ever built. Allowing vehicles with internal combustion engines into the tunnel would make the ventilation issues much more complex and would increase the pressure to ventilate the tunnel via the nature preserve, which should be avoided. Of course, by the time it would open in 2030, maybe all vehicles on Singapore's roads will be electric.
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Old February 5th, 2016, 12:09 PM   #589
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Environmental impact studies for CRL through CCNR gazetted:

http://www.todayonline.com/singapore...inglepage=true
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Old February 5th, 2016, 12:30 PM   #590
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News from CNA about the same thing. You can read the full article in the source link below.

Quote:
LTA to minimise environmental impact of Cross Island Line site investigation works
By Melissa Zhu and Olivia Siong, Channel NewsAsia
Posted 05 Feb 2016 18:21


The Land Transport Authority will reduce the number of boreholes it plans to dig from the original 72 to 16, following the first phase of an Environmental Impact Assessment and feedback from nature groups.

source: CNA
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Old February 6th, 2016, 09:03 AM   #591
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There are several new SI rig spotted around Mas Kunning area in Clementi. One is right along AYE, and the other along West Coast Road. If this is related to CRL, then perhaps CRL coming from Clementi Ave 4 could continue along Ave 3, before turning south at the Clementi Sport Hall, cutting cross AYE and then continue westward along West Coast Road. Will there be sufficient turning radius to execute a "U=turn"
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Old Today, 12:25 AM   #592
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News from TODAY. You can read the full article in the source link below.

Quote:
Impact of Cross Island work on MacRitchie significant without LTA mitigation measures
BY NEO CHAI CHIN
chaichin@mediacorp.com.sg
PUBLISHED: 4:20 AM, FEBRUARY 11, 2016
UPDATED: 5:24 AM, FEBRUARY 11, 2016


The impact on MacRitchie fauna — like the lesser mousedeer and the slow loris — from site investigation work for the future Cross Island MRT Line would be “large” if mitigation measures were not adopted following a report commissioned by the Land Transport Authority (LTA) now open for public inspection.

source: TODAY
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