Thanks for your replies.
The car park fill is not supported now and there is no retaining wall. The fill has a slope of about 45` which goes under the bridge.
The reason we want to dig first is that the fill material is very poor and is mostly rubbish. So we want to dig it first, compact it, and...
We have an old single span road bridge which was assessed and considered to be weak. As the railway line under the bridge is dismantled, one of the options is to fill up the structure with fill material and pumped concrete to provide continuous support to the bridge deck. Subsequent to the...