October 19, 2006 at the mine potash mine № 1 OJSC "Uralkali" (Berezniki, Perm region) after the crash began to notice a sharp increase in water inflow to the face.
The influx from the aquifer was strong, which was extremely dangerous — if the water saturation of solid salt layer will turn it into a kind of "ryapy", in the presence of a large system of cavities formed in the extraction of salt water will dissolve rocks with possible consequences on the surface .
To do in this situation, people have nothing they could, and October 28, 2006 the mine closed. Solution and transfer the potassium salt in the mine is widening, and after 9 months, July 28, 2007, formed a small dip in the factory area.
The failure of the growing "Stakhanovite" pace, and by the summer of 2008 has reached a diameter of 350 meters and a depth of about 100. Then, the process has slowed down.
The zone of destruction has got not only the mine, but also runs alongside the railway Chusovskaya-Solikamsk (where lay the rails — is clearly seen in the photo). Passenger trains were canceled in 2006, was built for trucks temporary round (see below picture). Now, trains and long-distance trains depart from the station located south of the city of Berezniki-sorting, delivering passengers to buses.
Soil settlement are expected near residential areas on Lenin Street. For resettlement to urgently built a new neighborhood — Usolsky.
Noteworthy that the accident — not the first. In 1986, the mine № 3 similar incident occurred — the formation of a strong sustainable water inflow to the face after caving. Then formed a failure similar size, but more elongated. But this was out of town, and now tourists from Berezniki go look at a beautiful lake formed …
Summed up the results of comprehensive monitoring of the situation on the Mine-1 OJSC "Uralkali" for the period from 3 to 9 September 2010
According to the chief geologist of OJSC "Uralkali" Sergey Glebov, on September 9, the minimum distance from the east side to the temporary failure of the railway remains the same: from the edge of failure (the eastern edge of the crack, was diagnosed 8/10/08) — 69 m from the crack, was formed 10/16/08 — 64 pm
Monitor groundwater in the area of the failure to make measurements of levels of water and brines in gidronablyudatelnyh wells, the brine level in the pipe barrel number 3 and the water level in the funnel of failure. On September 9, elevation of the water level in the funnel of the failure was +109.42 m
Instrumental monitoring land surface subsidence performed by the system of 48 monitoring stations, including the profile line, consisting of both ground and wall frames. Frequency of observations Identifies sedimentation rate and the projected surface deformation.
In the area of failure for the period from July 28 to September 3, 2010 were sedimentation rate of 2-8 mm / month, in slurry pits 2-4 mm / month. For the period from April 26 to September 6, 2010 settling around the salt dump, rassolosbornika, slurry pits on the east side were 10-38 mm / yr, with the west side — 16-54 mm / year, on the north side — 5.10 mm / year . In the area of municipal wastewater treatment plants for the period 06.01.2010 G. — 08/09/2010, the sedimentation rate were 7-25 mm / year. Flour mill in the area from April 22 to September 8, 2010 deposition were 0-2 mm.
Abnormal deviations in the mode of surface water bodies and watercourses due to natural causes, during the whole observation period from the start of the accident was not observed.
Last week the level of seismic activity in the area of the failure was quite low, a single event caused the destruction processes in rocks, for the reporting period have been identified. In the area of transition panels (carnallite zone) registered seismic events associated with the processes in the rock mass.