Friday, June 25
Discussion of new drilling location in Nenskra Valley with local people. The place we have chosen is on a mudrock close to the Nenskra river.
In the upper Nenskra valley first drone flights by Marinus from Bavarian air took place to get a better impression for the flight route in October.
Thursday, June 24
The rest of the cementation with standard Heidelberg cement took place. Now we have to wait until the cement is hard to see whether the cementation was successful.
Wednesday, June 23
The pump from Abchasia arrived, we were really glad. But – some mechanical part of this pump did not work. Thus we changed to original plan A and filled the well through the blue plastic tube with the help of the drillers. This day we cemented until 21 o´clock with our Pagel cement. The GB-SAR is working great – even at night.
Tuesday, June 22
The first pumping mixture failed because the pump did not work. How disappointing. And this also meant that part of our special cement was spoiled. Engurhesi helped to search for another pump. In the meantime we had meetings with Joni Chania and could clarify that our young colleagues could install corner reflectors on many places at the dam construction. The ground based SAR has been installed on the right side of Enguri River.
Monday, June 21
The borehole has been completed in the afternoon and we installed the Glötzl tool with all the cable in the well until the evening.Then we discussed with the drillers the pumping unit because the expansion cement of Pagel requires a strong pump. The geodetic/photogrammetic team Matthieu and Nils have been preparing the locations for the corner reflectors and especially colored the reflectors with black and white color (some color also has been on the boys).
Sunday, June 20
In the morning Waldemar Wotschal from Glötzl, Thomas Röckel and Birgit Müller worked in Shtolna-1 tunnel and combined the upper and lower parts of the Glötzl stress monitoring tool and fixed all the tubes at the sonde, set markers for the identification of the reference pressure cell and much more. Finally Waldemar could test each pressure cell and could give the okay, that it is prepared for installation. In the afternoon we had to go for PCR tests into the next village. Drilling of the replacement of Shtolna-1 well is still going on and will take one more day (hopefully not more).
Saturday, June 19
Drilling of Shtolna-2 well has started. In the evening the well was at ca. 9 m depth. We went into the warehouse on the other side of Enguri River. Matthieu and Nils collected all pieces for the installation of the Corner Reflectors and the rest of the team moved the Glötzl Stress Sonde, accessories and 600 kg of Pagel Cement from the warehouse to Shtolna. In the evening we went shopping (not jewelry or clothing, but building material) at Zugdidi. And we also had 2 short cultural stops and in the evening we enjoyed 4:2 Soccer win of the German team.
Friday, June 18
Arrival at 5 a.m. in Tbilisi. Travel from Tbilisi to Enguri Dam. In the late afternoon we went into Shtolna 1 to select the places to store the equipment just before installation and had a brief view on the Jvari Reservoir. Already in Germany we heard that the drilling of an additional well was necessary, because the Shtolna-1 well was not accessible to the final depth. Thus the works to drill Shtolna-2 well have been ordered.
Friday, April 23
Jakob and David used the good weather to drive to stations to build up more corner reflectors. Thomas and I went to the south of Georgia to visit a rather new cascade of HPP in the area of Shuakhevi. We talked with the responsible engineer at the site and could get (without photos) an idea about this HPP system in comparison to Enguri Dam. Also at this site, the power tunnel had been a real challenge.
Thursday, April 22
We went to Abchasia and we really got a unique opportunity because we went into the steel pipes of the penstock area in which the water runs directly to the turbines. Part of these 40 mm thick tubes had to be repaired. We also met our drillers which currently drilled a borehole close to the penstock… oh I wished I would have had Eduard, the winch and the televiewer at the site. Crossing the border takes a long time, so we came back in the evening with some great views into the technique of a giant powerhouse area.
Wednesday, April 21
Again Power Tunnel. We tried to measure more structures from adit 4 northward, but after 300 m we could not go on further because ca. half a meter of silt made us get stuck. Thus we returned to adit 1 to prolongate the part which we had been measuring the week before. This time, most of the lights already had been turned off and no rehabilitation activities were going on. So in the absolutely dark tunnel we had to rely on our flash-lights and we hoped that no one will close the big gate when we are in the tunnel. We spent several hours to measure from km 1 to km 2.1.
Tuesday, April 20
Andreas left for Tbilisi after the final check of the GB-SAR. Jakob and David worked on the Corner-Reflectors and Thomas, Birgit and Georgian colleagues took the opportunity to search one of Fritz Rummes Hydraulic Fracturing Boreholes and piles of rocks at the Khudoni location with the means of a metal detector. However, the tool was too weak to find the borehole and we had to go back without success (but being wet). Our Georgian colleagues want to return with a military version of a metal detector... But geologist Thomas was happy because he could measure some of the structures at the Khudoni location.
Monday, April 19
Together with Jakob from the geodetic team we measured the exact geodetic height of the KIT-1 and the piezometer wellbores. Only one of the wellbores has to be measured with triangulation methods because we got only too few satellites to determine the exact position. Because some of the boreholes had been on the lowest level we came very close to the open gates of Enguri dam and could admire the impressive water flow. In the meantime Andreas Schenk fixed together with David Svandadze and Georgian workers the GB-SAR at the warehouse station.
Sunday, April 18
Again we went into the Power Tunnel. This time for a distance of ca. 5 km from the entry at adit 5. Inside the power tunnel we checked fractures and spalling. Some of the open construction joints could be at orientations of tensile stresses, which had been calculated by PhD candidate Thomas Niederhuber (Team AGW-TP).
Saturday, April 17
On Saturday we provided a presentation for the company Energony who is doing part of the power tunnel rehabilitation works. Afterwards some of us were lifted via a crane and a cage from the top of the dam to the Jvari Reservoir lake. There we measured some points to follow the Ingirishi fault plane…. And we got up again to the dam top… Andreas Kron started his drone to follow our flight. But even colleagues who did not join the crane tour left the surface. Andreas Schenk installed the GB-SAR on the roof of a house at the warehouse site.
Friday, April 16
Trip to Nenskra valley. The teams of IWG and IPF had been checking the bridges in the Enguri and Nenskra-Valley for the possibilities to install instruments to measure the water flow and the sediment load in the rivers. All colleagues were impressed by the fact that one of the bridges had been damaged by a flood 2 years ago. (P1010082). In the afternoon the teams separated and the AGW-TP and Piewak & Partner went on to search for potential drilling sites in the Nenskra-Valley. This is quite difficult because only in a few places the bedrock reaches the surfaces. In most places the pebbles and rocks transported by the river would be critical for drilling and logging. However, the rocks close to the river provided a nice place for the lunch break.
Thursday, April 15
PCR Testing day. In the morning Piewak&Partner and AGW-TP checked for the northern prolongation of the Ingirishi fault. Other colleagues discussed with local builders the forthcoming activities and went shopping (building material).
Wednesday, April 14
The teams at Enguri have been working in the field. The IWG-team was digging at a 10 m high embankment for sediment samples in the centre of the Enguri Valley. At that position the original lake bottom had been crosscut by the river due to the low waterlevel which is required for the Enguri power tunnel rehabilitation works. The colleagues Stephan, Klajdi and Andreas also used a drone which offered some spectacular views. As everybody could imagine the digging at the surface was simple…. But they went down the embankment too. What they could not identify clearly was the remnant boot which they found…may be a lost scientist from an earlier field campaign. IPF built up the GB-SAR at the hotel location and the GIK team checked its equipment to be used in the field the next days. The AGW-TP and Piewak & Partner checked fractures in the power tunnel at adit 1 (close to dam) and adit 2 (Olori Valley) as well as the potential location of the Ingirishi fault in the Olori Valley.
Tuesday, April 13
After having passed the COVID Tests at Munich airport and the night flight, we arrived at around 4:30 a.m. on Tbilisi airport where we picked up cars (Andreas, Andreas, KLajdi, Jakob, Stephan) or got picked-up (Birgit, Thomas) by our Georgian colleagues. In the afternoon we met Mr. Aberle from Energony with whom we discussed the model results of T. Niederhuber for the Power Tunnel. Lateron we had a meeting with Director Joni Chania.