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Trench Collapse: The Warning Signs Every Site Team Should Know

A trench collapse happens fast, and usually without any warning. A cubic metre of soil can weigh up to 1.5 tonnes, and once the collapse starts, there is rarely any time to react. Knowing the warning signs, and what you need to have in place before you start digging, is one of the simplest ways to keep your team safe.

Why Every Excavation Needs a Risk Assessment

Under Health and Safety Executive’s (HSE) guidance on safety in excavations and Construction (Design and Management) Regulations 2015, any excavation deeper than 1.2 metres, or any excavations in unstable ground, regardless of depth, needs proper support. No ground can be assumed to stand unsupported, even if it held up fine on a previous project or “looks fine”. A proper risk assessment should be conducted prior to every excavation taking place. This should consider soil type, groundwater, nearby loads, weather conditions and how long the trench will stay open, not just how deep it is.

The Warning Signs

Warning signs can be easy to miss. Keep an eye out for:

  • Cracking or crumbling at the trench edge
  • Visible bulging or slumping in the trench wall
  • Water ingress or groundwater seepage (sometimes caused by heavy rain)
  • Previously disturbed or backfilled ground
  • Vibration from nearby plant, traffic or machinery
  • Spoil stacked too close to the edge

Matching the Support to the Site

Shallow doesn’t mean safe, and no trenches carry exactly the same risk. Getting the right support in place depends on ground conditions, depth, and how long the trench needs to stay open. That’s why GAP’s Trenching & Shoring Team works alongside your team from initial consultation through to delivery, not just dropping off kit. Whether that means trench boxes for a straightforward dig, hydraulic systems for greater depth or difficult ground, or trench sheets and modular bracing for a specific site challenge, the right solution should come from the risk assessment, not the other way around.

Why Choose GAP Trenching & Shoring

With specialist staff based at our depots nationwide, you get expert advice, not just equipment brought on a truck. Every solution is matched to your ground conditions and project timelines, so you can be assured that your project meets all relevant health and safety guidance.

Trench safety starts before you break ground, not after. Get in touch with our Trenching & Shoring team to learn more about a support solution for your next project.

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