RESULTS FROM an in-depth geotechnical survey of the ground beneath the collapsed Blackheath section of the A2 trunk road are expected next week.
Transport for London (TfL), which operates the road, has spent the last month boring up to 15m beneath the section called Blackheath Hill Road after a 6m diameter hole suddenly opened up on 7 April (NCE 18 April).
The dual carriageway road, which is a major artery for traffic in and out of London, was immediately closed in both directions.
Thirty seven households were evacuated by Greenwich Borough Council as a precaution.
The collapse of old chalk workings was immediately suspected as the cause, and TfL has been using three specialist drilling rigs to establish the depth and extent of the void.
The hole has been filled with gravel as a temporary measure to provide stability for the drilling rigs.
TfL engineers need the results of the geotechnical survey before a permanent solution can be considered. As a result, it is impossible for TfL to give a likely date for reopening.