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The soil around the fence is loose and the neighbor land is on the higher ground, so the rainwater runoff created problems.
There is a AG drain next to the retaining wall and we don't want the soil keep sliding to the gravel above the AG drain. Overtime, the soil will block AG drain...
My parents want to put some pavers on the soil to compact it. Is it a good idea?
What about installing some turfs on those soil?
Or we put some concrete on the soil?
Bastion 20kg Rapid Set Concrete - Bunnings Australia
So far,
the scale and intensity of landslide are not serious. But we want to start working on prevention before rainy season.
Hello @ivanptr
The ideal fix is to repair the retaining walls so that the water is guided out of the way and not through to your Agi drain. For a temporary fix, I suggest using Brutus 360 x 850mm Sand Bag - 10 Pack. Fill them with ordinary sand and place them along the fence where the most water flows when it is raining. It will hold the soil in place and divert most of the water away. A bit of the water may come through but only water will pass through and not the soil.
If you have any other questions we can help with, please let us know.
Eric
Thanks Eric what does it mean by "to repair the retaining walls so that the water is guided out of the way and not through to your Agi drain."
the neighbor on higher ground wont be willing to deal with it
Hi @ivanptr,
I'd recommend you consider removing and replacing this wall with a retaining wall that can adequately hold back the soil. Not only is the wall allowing the soil to migrate through it, but it's also not really retaining any soil at the top. Your current wall is not a retaining wall in the sense that it contains your soil. The blocks provide some stabilisation to the soil behind them and help prevent it from being washed away entirely.
I'd suggest installing posts and using sleepers for your new wall. The wall needs to extend up above the soil level to retain it adequately. I've created a rendering for you below to illustrate. Please note that depending on the height of your new retaining wall, it might require engineering, so make sure to check your local regulations.
Please let me know if you have any questions.
Mitchell
@MitchellMc I get that the concrete footing of new wall is to hold back the soil.
We are thinking, if our situation is not too serious, could we use some construction adhesive on the pavers to make a little "brick" wall?
You could certainly attempt to do that, @ivanptr. However, if you are concerned about the soil potentially giving way and subsiding, adding pavers to the top of an unstable wall is likely not a great solution.
It's hard to tell from your photo, but if we presume these blocks are 200mm high, and we can see at least four courses of height, then that's an 80cm wall. In your last picture, the soil looks like it extends at least 50cm above the wall in some places. That's a 1300mm height of unretained soil. To put that into perspective, if this was a new build, not only would you require a properly constructed retaining wall, but it would also need to be signed off by an engineer to ensure it complies with regulations. Total wall collapse is likely a bigger concern than the small amounts of shifted overburden you are looking to stop.
Mitchell
