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DUMPER ROLL-OVER CAUSES

HSE publish research on causes of dumper roll-over

 

This 100 page report found that ‘key contributions to rollover occur when working on uneven ground’. Dumper trucks feature very low levels of damping since their only ‘suspension’ is by deformation of the tyres and drive train. On uneven ground, this can produce significant roll angles in response to impact with a bump and this effect can be exaggerated if the natural frequency of the response coincides with another wheel of the truck hitting the same bump.

An investigation of the response of dumper trucks impacting a bump when operating on a sloping plane was conducted in the computer model. This indicated that impacting a bump can cause the vehicle to roll over on slopes significantly shallower than the static roll angle of the truck.

Comment: In summary, uneven ground and lack of suspension are the most likely causes of dumper roll-over. The researchers call for further work on the key design parameters likely to cause rollover in order to identify design modifications that would make dumper trucks less susceptible to rollover. The researchers also go on to recommend (without supporting evidence in the report) that ‘efforts are made to improve the quality of driver training’. Reviewing and following the existing guidance on dumper truck safety would also be a positive step to take.

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