A FORMER England kick boxer from Billinghay had to give up the sport after an injury at work left him with a dislocated hip socket and shattered pelvis, Lincoln Crown Court was told.
Zak Davis, 36, was buried to his waist in a trench while laying drain pipes after heavy rain last August.
Mr Davis had been working on a small housing development just off Wragby Road in Bardney when the incident happened.
He was laying drain pipes in a trench being dug by an excavator. It had been raining heavily during the day. While he was in the trench the digger operator noticed the walls beginning to crack and shouted a warning but before Mr Davis could escape he was hit by the falling material, including a large lump of concrete, and was pinned down by his legs.
After the hearing HSE Inspector Tony Mitchell said: "Excavation work is a high risk activity, but the risks are foreseeable and preventable.
"The site had previously been a farm. It had been demolished and the rubble spread on site as top fill. The subsoil beneath it was predominantly compacted sandy soil, so the ground conditions were poor.
"However, this was not properly identified as high risk before work started, the rain made the soil structure more unstable and the trench collapsed because it was not sufficiently supported.
"This incident could have been prevented by the use of mechanical trench supports or by sloping the trench sides further. Instead, a man has been left with life-changing injuries."
An investigation by the Health and Safety Executive found Nottinghamshire-based company Phil Watson Civil Engineering Ltd had failed to assess the ground conditions and the effect that the rain would have, and failed to install measures to prevent a trench collapse.
The company was fined £10,000 after it failed to comply with safety checks following the bad weather.
Phil Watson Civil Engineering Ltd, based in Shirebrook, near Mansfield, admitted the charge of breaching regulations by failing to assess ground conditions and the effect of the rain.
The company also failed to install the measures to prevent the trench from collapsing.
The company was also fined £2,141 in legal costs and a £15 victim surcharge.