Weak Ground

 

Weak Ground

What does weak ground mean?

Weak ground occurs when the layers of earth are unstable and/or loose. Weak ground cannot adequately support the weight of structures or floors, so they subside and cause hazards. Uneven concrete floors, fractured floor tiles, and wall cracks, are all strong indicators of weak ground beneath the structure. Weak ground needs to be fixed as quickly as possible to prevent further damage.

Jet Grouting used to strengthen ground on a massive scale.

Teretek deep-lift solution helping to stabilise weak ground

Teretek deep-lift solution helping to stabilise weak ground

What causes weak ground?

There are a number of different things that can cause weak ground, both natural and man-made. For example, the ground may already be made up of loosely-packed materials such as soil or sand. Or human activities such as drilling and excavating can loosen previously-dense ground.

Weak ground can happen over a large area or in smaller areas. Ground that is not uniformly weak will still lead to subsidence issues.

Different types of ground are susceptible to different conditions. For example, clay is prone to contracting in drought conditions, gravel can be affected by nearby construction or heavy traffic, and dirt can be softened by excess water.

Regardless of the cause, weak ground is reason to be concerned. Subsidence is the most common issue, which needs to be fixed to protect the building and its inhabitants.

Likely causes:

  • Water flooding the ground
  • Drought drying out soil
  • Washaways from broken pipes (such as water, sewer, stormwater drainage)
  • Poorly-compacted fill
  • Liquid, gas, or mineral resources being removed from the ground
  • Erosion
  • Earthquake and seismic activity, often resulting in liquefaction
  • Tree roots can suck moisture from the ground
  • Vibrations caused by heavy road traffic or by machinery
  • Absence of an organised footing system in very old buildings or in buildings with additions or alterations
  • Nearby excavation
  • Heavy loading
  • Deterioration of retaining walls

How to fix weak ground?

Mainmark specialises in soil stabilisation and ground compaction, foundation repairing, strengthening weak ground and making it suitable to support existing structures like buildings, bridges, and roads.

Mainmark’s proprietary Teretek engineered resin solution assures sub-grade stability under existing on-ground structures including buildings, concrete floors, driveways, roads, paved airport runways, bridge approach slabs, bridge abutments, and more.

Mainmark’s methods are fast, precise, neat and tidy, and don’t generally require you to vacate the building while work is being done.

Various product warranties and Building Code requirements apply (please contact us to see which apply in your region or country).

Weak Ground under Homes

Mainmark’s ground-strengthening techniques create a strong foundation under on-ground structures of any size, from driveways to airport runways, and from residential homes to large office buildings. We have successfully strengthened and re-levelled the ground under thousands of homes around the world.

We visit your home, assess the damage, and discover the cause. Our experienced engineers and technicians establish the approach needed, creating a plan specific to the needs of your house.

As the weak ground under houses is strengthened, the house and its sunken floors and driveways are re-levelled; any internal and external wall cracks generally close up too. Most importantly, structural damage is resolved and, with a stable foundation, the future of the house is sound.

Our foundation repair solutions are the modern alternative to the traditional way of underpinning; it’s like keyhole surgery compared to concrete underpinning.  Our proprietary solutions are cutting edge and use a series of small resin injection holes to underpin concrete slab floors. We can also raise and re-level ‘waffle-pod’ slabs, strip footings, and raft slabs, plus we can infill under paths and driveways.

The method Mainmark most often uses involves injecting structural, expanding resins into the ground. This resin injection method is most effective where the sub-grade soils are cohesive. The resins and hardeners mix together in the ground, and expand to compact the adjacent soils and increase their load-bearing capacity.

Benefits of Mainmark’s ground stabilisation methods:

  • Can be carried out at one or more depths, as deep as 14 metres under the surface
  • Can increase the bearing capacity of weak strata under structures by up to 500 per cent
  • Can be carried out in conjunction with raising and re-levelling the on-ground structure
  • Can be used to prepare structures that need to support increased loads, e.g. when there is to be an addition to the building itself
  • We don’t make a mess: there is no concrete dust, water, or any other materials to clean up
  • There is minimal disruption to your daily life
  • We don’t cause further damage to the house, driveways, or landscaping
  • With simple jobs, residents can stay in the home and may not even need to move furniture
  • Techniques are non-invasive: we don’t tear up floors or excavate ground
  • Our methods are fast, completed in a fraction of the time of traditional methods; we can often finish your project in as little as one day
  • The products and techniques we use have zero negative impact on the environment.

Mainmark ground strengthening correction methods used on Homes:

Weak Ground under Heritage Buildings

Heritage buildings bring specific challenges and require a precise, delicate approach to ground strengthening. Our methods work because they stabilise the ground underneath the heritage building, potentially giving it a stronger foundation so that it remains standing long into the future.

Many heritage buildings stand on weak ground because of the age of the structure and the length of exposure to ground weakening factors. By strengthening the ground, the building can be brought back to level, usually closing up internal and external wall cracks and resolving structural damage.

Key benefits of Mainmark’s ground strengthening methods include:

  • Floors and buildings are brought back to level
  • Non-invasive techniques keep further damage to the building, and the landscaping around it, to an absolute minimum
  • We don’t tear up floors and excavate ground, so historical integrity remains unaffected
  • Internal and external wall cracks generally close up, leaving only cosmetic treatment (plastering, painting, and re-pointing brickwork)
  • Jammed doors and windows can usually operate properly again
  • Methods are effective on various foundations, such as, bluestone, brick and sandstone.

Mainmark ground strengthening methods used for Heritage Buildings:

Weak Ground under Commercial and Industrial Structures

Mainmark can strengthen the ground and repair the foundation under structures of any size, including commercial and industrial structures. The processes are time- and cost-effective, making them sought after around the world.

When weak ground leads to subsidence in commercial structures, it can result in damage to plant and machinery, occupational health and safety risks, and reduced efficiency if certain areas can’t be used. By strengthening the ground underneath the structure, Mainmark eliminates subsidence. With structural damage resolved and the building back to full capacity, businesses can regain that lost productivity.

From parking areas and loading docks to warehouses and office buildings, Mainmark’s methods are suitable for any building of any size.

Benefits of Mainmark’s ground stabilisation methods:

  • There is minimum disruption to the site
  • There is little, if any, downtime to the business. In many cases, the site can still operate, with staff able to continue working (this is case-dependent, damage may be such that this is not possible)
  • Projects are completed in a time-frame significantly less than many traditional “underpinning” methods
  • Non-invasive techniques keep further damage to the building, and the landscaping around it, to an absolute minimum
  • We don’t tear up floors and excavate ground, so do not create mess
  • Internal and external wall cracks generally close up, leaving only cosmetic treatment (plastering, painting and re-pointing brickwork)
  • Jammed doors and windows can usually operate properly again
  • Trip hazards are eliminated. Often, forklifts and trucks can run smoothly just 30 minutes after the floor or driveway is re-levelled
  • There’s usually no need to move stock or machinery off the floor
  • Warehouse shelves and conveyor systems usually return to their correct positions as floors are re-levelled
  • Most large factory and warehouse floor repairs are completed in a day or two. There’s no cutting out of old slabs and no waiting days for new slabs to cure.

Mainmark ground stabilisation methods used for Commercial and Industrial structures:

Weak Ground under Infrastructure

Weak ground under infrastructure can have serious consequences. It results in sinking structures which can become hazardous if not resolved promptly and correctly.

Mainmark has successfully raised, re-levelled, and re-supported sunken roads and highways, bridge approach slabs, bridge abutments, culvert areas, concrete slabs, airports, seaports, railways, parking areas, and many other civil works.

Because our processes are so efficient and cost-effective, infrastructure projects around the world rely on Mainmark.

By strengthening the ground underneath the structure or approach slab, Mainmark eliminates subsidence. With damage resolved and the structure back to full capacity, businesses can usually regain lost productivity.

Mainmark can also stabilise soil and prevent slippage on slopes or embankments next to roads and railways, including bridge abutments and bridge approaches.

Mainmark’s methods are suitable for any structure, of any size. We also re-level parking areas, loading docks, hardstand areas, driveways, and roads.

Key benefits of Mainmark’s ground stabilisation methods include:

  • There is minimum disruption to the site, no excavation and no mess
  • There is little, if any, downtime to the site, in many cases, it can still operate (this is case-dependent, site requirements may be such that this is not possible)
  • Projects are completed in a significantly faster timeframe than traditional methods
  • Non-invasive techniques mean further damage to the site, and the landscaping around it, is absolutely minimal. We don’t tear up areas or excavate ground, creating costly and time-wasting messes
  • Trip hazards are eliminated. Vehicles and machinery can run smoothly almost immediately
  • Re-levelling is completed in a fraction of the time of traditional methods. There’s no cutting out of old slabs and no waiting days for new slabs to cure
  • There are usually substantial cost savings in comparison to traditional methods
  • Weight is no problem. In fact, the greater the weight on the ground the more it can be compacted. Huge ground support can be created, especially when the area is loaded with weight
  • There’s minimal interruption to traffic flow or activities to busy facilities, such as roads or airports.

Mainmark ground stabilisation methods used for Infrastructure:

Weak Ground in Mining and Resources

In mining and resources applications, weak ground and subsidence can create significant occupational health & safety challenges. Mine subsidence can also create lengthy downtime, as support structures have to be built to help minimise safety hazards.

Mainmark methods can be used successfully on any structure of any size. For many years we have raised, re-levelled, and re-supported on-ground and in-ground mine-site structures, including:

  • Coal loader towers
  • Conveyer belt pedestal bases
  • Rock-breaker footings
  • Rail index machine slabs
  • Vehicle service centres & garages
  • Stacker reclaimer rails
  • Office buildings
  • Conveyer belt counter-weight towers
  • Railway lines
  • Engineering workshops
  • Parking areas
  • Loading docks

Key benefits of Mainmark’s ground stabilisation methods include:

  • There is minimum disruption to the site, no excavation and no mess
  • Projects are completed in a time-frame significantly less than traditional methods
  • Non-invasive techniques mean further damage to the site, and the landscaping around it, is absolutely minimal.
  • We don’t tear up areas or excavate ground, creating costly and time-wasting messes
  • Trip hazards are eliminated. Vehicles and machinery can run smoothly almost immediately
  • Re-levelling is completed in a fraction of the time of traditional methods. There’s no cutting out of old slabs and no waiting days for new slabs to cure
  • There are usually substantial cost savings, in comparison to traditional methods
  • Weight is no problem, in fact the greater the weight on the ground the more it can be compacted. Huge ground support can be created, especially when the area is loaded with weight
  • There’s minimal interruption to the site, operations can often continue while the work is being completed.

Mainmark ground stabilisation methods used for Mining and Resources:

 

 

 

Tell us your problem:

Don't see the solution to your ground engineering problem here? Talk to us, we can help. For an extensive analysis of your specific problem please complete our detailed enquiry form, alternatively fill in our quick contact form to the right.

 

 

 AU: 1800 623 312    NZ: 0800 873 835

Quick Contact

(*) Compulsory Fields