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     Marijke & Piet.

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How to deal with Ginshanada soil settlement


This photo shows the new solution,... for now.

In the last 18 years  the surface in our garden settled about 25 centimeter (10 inch), total. Halve way, as we know now, we invented different solutions for particular area's and problems. Unfortunately you do not know on forehand how  low it goes and whit what speed.

Some seven year ago we invented a good solution. One solution would be to remove the gravel, path and barrier cloth, higher the surface with extra soil, sand in this case, to the desired height, and place all components back.
We opted for an other solution that is, leave part of it alone and use rock look-a-like tiles to compensate for the different in height.
This is rock look-a-like tiles what you see just under the gray-blue strip.

Soil undergoes both primary and secondary consolidation.
Primary consolidation is short-term and takes place during the mechanical compacting process. Secondary consolidation is long-term and takes place after the compaction process is complete and the permanent loads are in place (soils-settlement).




In a attempt to use an alternative solution we tried to overcome the gap (about 10 centimeter (3-4 inch)) with a the current ground level. Plastic folio with small gravel, in very much in the colors of the  Ginshinada gravel. However, for a number of reasons this alternative did finally not make it.


Oribe roji



What made it was a additional border with groundcover planting.

In the case of the Ginshanada, our main garden gravel surface, we also re-do the Path around the house.

The "stepping stones" tobi-ishi, "floats" in (that is what tobi means) the Ginshanada.
The Roji, tobi-ishi path (main garden) is very much inspired by the so called "Oribe's style".




The new border is covered with two new types of groundcover plants:

  • Vinca Minor (Kleine Maagdenpalm) for the West facing and sunny area.
  • end for the North facing area the Mitchella repens (Patrijsbes).

(Groundcovers and Index of plants in Tsubo-en).



The remaining area's also needed a up-level of about 10 centimeter (3-4 inch).

This was also an opportunity to remove the gap between the house and the  Ginshinada and to terminate the many ant nests (Control of pests, weeds and diseases in Tsubo-en).

In addition to leveling the gravel I also took the opportunity do eliminate undesired mosses in the gravel.

During this maintainance activity we found Truffles. This is described later in a separate post.


Related: Ginshanada, our main gardenThe Roji, tobi-ishi path (main garden)Control of pests, weeds and diseases in Tsubo-enMaintenance, Post: Undesired mossesundesired mossesGroundcovers , Index of plants in Tsubo-en.