Rubble Mound Structure Foundations

Rubble Mound Structure Foundations

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Rubble Mound Structure Foundations

Get a project estimate today:



Resolve underwater scour issues with HYDROTEX fabric-formed concrete scour protection mattresses.

The best solution for localized scour underwater and on land, HYDROTEX provides superior protection against harsh hydraulic forces under the sea.

How? The geosynthetic panels are laid out underwater at berths, ports, and harbors, then pumped with fine aggregate concrete. The result is a fabric-formed concrete mat that conforms to the scour depth around pier piles, on embankments, and under any marine structure.

How is HYDROTEX used to create a foundation for rubble mound structures?

The Problem

Rubble mound structures (breakwaters, jetties, oyster reefs, etc) are a critical component of any coastal system. They are one of many ways to control water flow and direction as it comes in from the sea, protecting port operations and ecological environments.

Proper foundations are imperative to ensure the long-term performance of these structures. Without a foundation, you risk having to spend millions in repair or replacement costs.

The Solution: HYDROTEX Fabric Forms for the In-Situ Casting of Concrete

Cast a concrete foundation under a jetty with HYDROTEX fabric formworks. The result is a permeable concrete mattress that effectively prevents soil loss beneath the breakwater, preventing differential settlement and improving the structure’s stability and longevity.

Best HYDROTEX Fabric Forms for Casting an Oyster Reef Foundation

Articulating Block Concrete Mat on Slope

HYDROTEX® Articulating Block



HYDROTEX® Grout Bags



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Whether used as breakwaters or shoreline protection systems, rubble mound structures play a critical role in coastal civil engineering projects.

Protect your rubble mound structure from underwater erosion and scour by creating a foundation below the structure, minimizing soil movement and counteracting wave conditions that can critically compromise its efficacy and stability.

HYDROTEX fabric-formed concrete is the best solution for such a need, ensuring the longevity of the structure and minimizing erosion of the coast’s shores.

Rubble mound structures are typically needed for:

Marine facility

Related Solutions

HYDROTEX® Grout Bags

Grout (Concrete) Bags


Synthetex’s HYDROTEX® Grout (concrete) Bags (GB) and tubes are an economical and convenient choice for applications requiring concrete, grout or sand filling.  Constructed of the high-strength polyester fabrics and using a heavy-duty sewing process, our bags are ready to perform in your most demanding construction or repair installations.  The custom designed bag is available in a variety of materials and a wide assortment of dimensions, porosities, volume capacity, and filling valve types that ensure compatibility with your applications.  Their flexibility and size makes them ideal for installation through confined spaces.

Synthetex provided more than 70 grout bags ranging from a 1.5 m³ to 168 m³ capacity for the repair of an airstrip jetty in the Shetland Islands, Scotland.  The bags were first filled with water and then the water displaced with concrete to permanently fill voids in the rock jetty.

The bags provide the formwork required to cast concrete elements with the mass and stability to withstand the waves and rapidly flowing water.  The concrete grout bags may be placed side-by-side or stacked to form an inherently interlocked concrete structure.  As with our HYDROCAST® formworks, concrete grout bags can be positioned and filled with concrete from the surface in shallow water or by divers in deeper water.

Since they are cast-in-place, they intimately adapt to variations in the subgrade or bottom contours. Installations do not require dewatering, a crucial advantage in emergency repair of scour aprons.  Unlike rock or precast concrete blocks, they do not require placement by heavy lift cranes working from the land or from barges.

Synthetex’s grout bags can be used to help with the following:

  • Breakwater, dike, groin and jetty repair
  • Bridge column repair
  • Culvert aprons
  • Embankment stabilization
  • Grout bag underpinning
  • Seawall and quay wall repairs
  • Scour repairs
  • Vertical drains
  • Void filling

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HYDROTEX® Articulating Block

Articulating Block (AB) Concrete Linings

Articulating Block (AB) Concrete Linings


Articulating Block Mats form cable-reinforced concrete block mattresses that resist erosive forces. They are often constructed where a revetment is exposed to frontal attack by wave action.

AB Mats are typically used to protect coastlines, canals, rivers, lakes, reservoirs, underwater pipelines, bridge piers, and other marine structures from propeller wash, ship wakes, wind waves, currents, and high velocity flows. They are also used in environmental construction for landfill caps, down chutes, and collector channels.

The AB fabric form consists of a series of compartments linked by an interwoven perimeter. Grout ducts interconnect the compartments, and high-strength revetment cables are installed between and through the compartments and grout ducts.

Once filled, the AB Mats become a mattress of pillow-shaped, rectangular concrete blocks. The interwoven perimeters between the blocks serve as hinges to permit articulation. The cables remain embedded in the concrete blocks to link the blocks together and facilitate articulation.

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Submit a Request for an Articulating Block Specification

We’ll get back to you within 1-2 business days. All specifications are available in both nylon and polyester configurations.

Submit a request for a technical specification

We’ll get back to you within 1-2 business days. All specifications are available in both nylon and polyester configurations.





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HYDROTEX Articulating Block

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