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ideas for concreting sloping bank into pond


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Some years  ago (5) I poured some concrete over the sloping sides of my pond, we recently have had a  lot  of rain and  the whole  lot slid  into the pond, pond  is 4-5  metres  deep below  the water line, the bank is  quite steep and Im  looking for  ideas to re-do the concrete to stop it  sliding in again. Piles  will be tricky and its  only  got to  support the weight of the concrete slab not a whole  house, did think of  just smashing into the ground a load of galvanised steel  poles about a metre  down in the hope of  stopping it  sliding in again. Access is difficult. I did this  before  by just laying a  metal frame over the soil but didnt  put any metal in, guess  that was an oversight as maybe smashing in metal then would  have prevented this sliding into the water. I think piles is over the top as one guy quoted us 269k to do this which seems way over the top. Each length is  about 2.4  metres long but then the slope keeps  going down  another 4  metres to the bottom so  Ill need to stop it sliding in again. Thoughts?? Soil is  quite  hard its  not backfill or  rice  paddy theres a lot of stone in it. Total length is  about 40 metres

conc slope (1).jpg

conc slope (2).jpg

Edited by bodga
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1 hour ago, ourmanflint said:

The sides will need supporting at the bottom of the pond, is the base just mud?

 

its in various soil types  going down thru 5  metres, Im going to get  piles stuck in to stop the new concrete sliding in, there  will be a lot of sediment at the bottom.

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I would do 2 things:

 

1. Hammer in rebar 90 degrees to the slope. Bend the rebar at the top to give a lateral bar above the soil level that will be encased in concrete. Make this bent part 30cm to give good strength. Do as many as you can as deep as you can.

 

2. Divide the sloping concrete into sections (I think you did this already but can't  see clearly) so there is not one huge weight trying to slide downwards. Within the sections add more rebar tied to the bars that are hammered in. Thinner bars will do.

 

Will you drain the pond a little to allow work below the current level? 

 

Any chance you can tie the sides into the fencing we see in the photos?

 

Could also consider taking the concrete over the top edge in each section with rebar hammered in vertically along the top edge.

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I'd consider digging out the old concrete, if possible at all,
so in future this does not cause problems.
then
sloping the walls properly, something like one/two meters horizontal , one meter 45 degrees, someone with an engineering back ground can recommend better course of action. (See also the Thai construction guidelines for digging out Sand and gravel Pits)
strengthen the walls with geotextiles and large stones.
thought behind that is to create a though but permeable wall,
not one block of many tons of weight that inevitably will give way to the water flow.

budget question I cannot comment.

my 2cents

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Possible problem is water buildup behind the concrete - cannot see any drainage holes on the front face. You had a landslip .... At that steep angle, you cannot expect concrete slabs to stay put without some anchorage, unless you start from the bottom of the pond. Also quite possibly erosion has undermined the concrete slabs from below.

 

Terracing the side will also reduce slippage risk - but hard to do on an existing pond.

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The previous (good) Deleted introduced a grass with a massive and deep root system for use in situations outlined by the OP. 

 

Thais sometimes refer to as the 'Kings Grass' or more correctly as 'Paw to-wong' - just a thought

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