Richard Jackson Ltd were appointed to undertake ground investigation and subsequent remedial works associated with a solution feature in chalk beneath a pub in Suffolk that caused significant damage and the pub had to be closed.
Given the nature of the problem, works were initiated quickly to the pub and the adjacent highway closed down. A series of deep dynamic probes and window sampler holes were formed around the area to establish the extent of the feature and assess measures required to remediate the problem.
In conjunction with Keller Ground Engineering, a system of compaction grouting was developed. A series of rotary boreholes were formed, into which a stiff grout mix was injected to fill voids and density the soils, some of which were angled beneath the pub.
The competency of the grouting works was assessed, again using dynamic probing on completion and a 50% improvement in the post treatment conditions noted.