On May 22, the site of the Three Gorges Project was clear and sunny after the rain. On May 20, the Three Gorges Dam, which was poured onto the top of the line, showed a new posture. The Three Gorges Dam is currently the largest concrete gravity dam in the world, with a total length of 2309 meters and is divided into two dam sections, the left and right. The total length of the left bank dam is more than 1,600 meters. It was poured at the end of 1998 and completed in October 2002. The right bank dam is more than 660 meters long and it began to be poured in July 2003.
At 4 o'clock on the afternoon of June 6th, along with a loud noise, the third stage of the Three Gorges Project, RCC cofferdam was successfully demolition. The third stage of the Three Gorges Project is a temporary temporary retaining building with a total length of 580 meters. The top elevation is 140 meters and the top width is 8 meters. With the completion of the Three Gorges Dam, the reclamation has completed its historic mission of retaining water.
The explosion required 192 tons of explosives and more than 2,000 high-tech digital detonators. Before the blasting, the upper excavation pit was filled with water of 139 meters high, 4 meters higher than the river water level outside the cofferdam, thereby reducing the impact of water shocks on the dam at the time of blasting, and making the cofferdam upturned upstream. After the filled explosives will be flooded in water for a long time, the maximum depth is about 38 meters, which puts a high demand on the waterproof of explosives. It is extremely difficult to blast, and there is no precedent at home and abroad.
After the main project of the Three Gorges Dam is basically completed, the upstream cofferdam needs to be demolition. Since the cofferdam will burst into the water after the cofferdam is blasted, it will have a certain impact on the dam body. Therefore, it is necessary to monitor the impact force of the water hammer wave before and after the explosion. Dam body vibration and displacement data. The trials used the company's high accuracy dynamic DAQ system to successfully obtain irreversible test data.
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