Camrysfa Turbocharged June 2, 2018 Share June 2, 2018 This looks like water Volcano effect, where the earth magma pushes up. Oceanic kaiju coming up. Don’t understand how come water seeping into the road can cause presure buildup that can lift a couple of tonnes road. Would’t the water be squirted out if the road shifted? Is LTA saying that water seepage caused a mini volcanic action? If I place a brick inisde a pail and continuously pour water into it, will the brick rise? Engineers, something missing in their explanation? ↡ Advertisement Link to post Share on other sites More sharing options...
therock Supersonic June 2, 2018 Share June 2, 2018 Don’t understand how come water seeping into the road can cause presure buildup that can lift a couple of tonnes road. Would’t the water be squirted out if the road shifted? Is LTA saying that water seepage caused a mini volcanic action? If I place a brick inisde a pail and continuously pour water into it, will the brick rise? Engineers, something missing in their explanation? If the water is trapped in a table section between two relatively impenetrable parts, the water-logged section will expand and if the bottom plate is more fixed as we should expect, the only way is up.. so the path of least resistance is upwards, and the road which is relatively weak and pliable will crack.. 1 Link to post Share on other sites More sharing options...
kdash Supersonic June 2, 2018 Share June 2, 2018 Donât understand how come water seeping into the road can cause presure buildup that can lift a couple of tonnes road. Wouldât the water be squirted out if the road shifted? Is LTA saying that water seepage caused a mini volcanic action? If I place a brick inisde a pail and continuously pour water into it, will the brick rise? Engineers, something missing in their explanation? the water pressure buildup was underneath the high density polystyrene layer which does not allow water to seep through. as the temp road heaves up, the interface to the permanent road gave way. 4 Link to post Share on other sites More sharing options...
Neutrino Supercharged June 2, 2018 Share June 2, 2018 Come out quickly with explanation so I suspect they must've known about possibility of upheave due to water seepage. They know we have a lot of rain this year so why go for that form of construction especially polystyrene. Link to post Share on other sites More sharing options...
Carbon82 Moderator June 2, 2018 Share June 2, 2018 Don’t understand how come water seeping into the road can cause presure buildup that can lift a couple of tonnes road. Would’t the water be squirted out if the road shifted? Is LTA saying that water seepage caused a mini volcanic action? If I place a brick inisde a pail and continuously pour water into it, will the brick rise? Engineers, something missing in their explanation? All because of the Polystyrene (PS) layer at the bottom most part. As such polymeric material have a lower density than water, it would ended up floating, if there are sufficient amount of water underneath it (akin to how Marina Float function). The question I have instead, it that why the earth underneath is so dense that it affect water seepage, or was it the case where there are insufficient drainage provision to prevent rapid built up of water underneath the PS layer? I think I have mentioned before in MCF (other thread) that with more property development coming up (which affect water drainage pattern), as well as the climate change experienced in the past 10 years, the so call 50 years or 100 years probability factor can not longer a accurate gauge to drainage design. In fact in one of the course I have attended in 2011, I was told that NEA and other agencies are reviewing the factor and will revise it to reflect currency, but seems like nothing have been done, yet! Come out quickly with explanation so I suspect they must've known about possibility of upheave due to water seepage. They know we have a lot of rain this year so why go for that form of construction especially polystyrene. PS is a sensible choice for: - it is lighter and easier to deploy than say rock or sand - it polymeric property allow it to absorb some degree of vibration 6 Link to post Share on other sites More sharing options...
Camrysfa Turbocharged June 2, 2018 Share June 2, 2018 the water pressure buildup was underneath the high density polystyrene layer which does not allow water to seep through. as the temp road heaves up, the interface to the permanent road gave way. still baffled .... ( google) one of the properties of high density extruded polystyrene is in simple layman term - waterproof. Don't know what's below the temp road, but can we assume it is to prevent water seeping to structure below. Something like waterproofing our hdb toilet floor so that it won't leak to unit below. but in this case water got below the polystyrene layer, got locked and pushed upwards... Link to post Share on other sites More sharing options...
DACH Supersonic June 2, 2018 Share June 2, 2018 In fact in one of the course I have attended in 2011, I was told that NEA and other agencies are reviewing the factor and will revise it to reflect currency, but seems like nothing have been done, yet! Why bother talking to the walls? Anyway, drove past the place just now. Seems ok already. Link to post Share on other sites More sharing options...
Kopites Supersonic June 2, 2018 Share June 2, 2018 Why bother talking to the walls? Anyway, drove past the place just now. Seems ok already. raining soon. sky pretty red now. Link to post Share on other sites More sharing options...
Davidklt Supercharged June 3, 2018 Share June 3, 2018 To their credit, this was fixed in less than a couple of hours. 1 Link to post Share on other sites More sharing options...
Matrix0405 5th Gear June 3, 2018 Share June 3, 2018 To their credit, this was fixed in less than a couple of hours. The heavy rain must be stop-work for nearby road pavement units, so they can come quickly, fully equipped. Ironically saved by the rain. ↡ Advertisement Link to post Share on other sites More sharing options...
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