![](https://www.soil-engineering.co.uk/wp-content/uploads/2018/09/bulk-infill-grouting-400x265.jpg)
![](https://www.soil-engineering.co.uk/wp-content/uploads/2018/09/bulk-infill-grouting-400x265.jpg)
The works involved drilling a grid of rotary percussive holes across the treatment area and injecting the workings with a cementitious grout in order to render the ground stable and enable the safe upgrading of the road.
The carriageway was required to remain live throughout the duration of the works, with the exception of night time and weekend closures. The majority of the drilling and grouting was undertaken from the verges at the side of the carriageway, with a large number of inclined holes calculated to intercept the seam at the correct sub-surface location.
Soil Engineering completed the works successfully in a very challenging environment, using 2no rotary percussive drilling rigs and a large-scale bulk grout mixing set-up. Boreholes were drilled using water flush, in line with Coal Authority permit conditions, due to the proximity of housing, and to minimise dust generation in the vicinity of the road network. The grout mixing compound was established remotely from the treatment area on the eastern roundabout of the motorway junction and grout was pumped to the treatment area via a network of underground ducts, designed to minimise disruption to the flow of traffic.
Initial drilling indicated that ground conditions were not as modelled, requiring a significant increase to the original scope of works. In order to minimise disruption to road users Soil Engineering were able to accommodate these requirements by undertaking night time and weekend works, avoiding peak time lane closure.
A total of 1,135no holes (11,570 linear metres) were drilled and 4,370 tonnes of PFA/cement grout were injected into the workings. Pressure testing in the treated seam at the end of the works provided assurance that effective consolidation was achieved.
The works were completed in less than 12 weeks, utilising in-house drilling and grouting plant. Strict adherence to the stringent health, safety and environmental requirements of the contract were maintained at all times throughout the works.
Some might say “about time”, but Soil Engineering’s continued upgrade and expansion of the drilling fleet now includes the Eijkelkamp Fraste XL140 Duo rig with Sonic Drilling Capability. Unveiled at this year’s Geotechica show, the latest addition to our highly flexible Ground Investigation Fleet also supports the launch of our “Specialist Geoservices” unit. Specialist Geoservices […]
Read more ➜Lead Driller Keiron Lee, a stalwart of Soil Engineering’s market leading skilled workforce celebrated his 25th year of service with the business in November 2023. Now, barely six months later, we’re delighted to reveal that Keiron has also completed his Level 3 NVQ in Advanced Land Drilling, firmly positioning him at the pinnacle of the […]
Read more ➜Transport Scotland have announced that Soil Engineering Geoservices have been awarded the contract to provide ground investigation services at the A83 Rest And Be Thankful, to support the design of their medium term solution for the safety of the route. Long-standing framework suppliers to Transport Scotland, Soil Engineering have previously undertaken complex investigation works along […]
Read more ➜