Dams-dam-earth: protecting water, strength and nature

Seismic promotions in the John Hart Dam included building a plastic concrete parts wall to fill the Middle Earth. Bauer used two MC 96 devices with hydraulic grab and cutting to dig the new basic leakage barrier. © Bauer Group

One of three dams on the Campbell River on the Vancouver Island of Canada, the John Hart Dam was built in 1947. It was designed with seismic considerations based on the information available at that time, there is now a greater understanding of the risks posed by earthquakes in what is known as the Cquadia moving area.

With a large earthquake every 500 years, and with a range of 300 and 800 years between events, this means that one may be worth at any time. For this reason, seismic promotions are now taking place in the BC Hydro Dam.

The dam is only six minutes drive from the Campbell River, and the dam provides water to generate power in John Hart Poworus, and provides flood risk management operations, and supplies the city of Campbell with drinking water, in addition to providing water for preoccupations imposed in an area known as the salmon capital in the world.

Over the past ten years, BC Hydro has replaced the river stream plant in John Hart to meet seismic standards, maintain reliability and protect fish habitats, and is now in the process of rebuilding the dam itself. Once you are completed, you will be able to withstand an event for 1 in 10,000 years, or a severe earthquake of 9.0 or stronger.

The John Hart Seismic Seismic Morder project began in 2023, which is part of the recently announced BC Hydro plan for $ 36 billion, and ten years to support current assets including dam network, transportation lines and sub -stations.

The current promotions – mainly by “expanding” the base of the dam by adding the upholstered and innovative shells, and inserting an additional water leakage barrier in the same dam – designed to enhance the dam's ability to withstand severe shake of the earthquake.

To protect the John Hart Dam, the Bauer BG 30 has been used to make this soil improvement along with other equipment. Waterproof

Bauer ESTISS Canada, a subsidiary of the Bauer SpezialTBAU GmbH, has been assigned to implement a new water leakage bar within the main land division of the dam.

The project, which is managed by the AECON/EBC partnership, includes building a low plastic cutting wall of permeability to bridge the outskirts of the middle earth to improve water barriers and seismic performance of the Earth's outskirts. In addition to the curved wall works, Power improved the soil on soft sediments to promote the North Earth Earth Dam.

Building tasks in Power included the installation of the plastic concrete parts wall in addition to the intensification of land and the marine to treat new barriers that have been promoted. One of the main challenges is to reduce the environmental impact on the tank, the Campbell and the surrounding park during construction, especially near the drinking water extraction point for the Campbell River. Work began in October 2023 and was successfully completed in July 2024. Another stage of improving the soil will follow in 2025.

The John Hart Dam update included a variety of technical and logistical challenges.

“As a result, accurate planning and the latest equipment were necessary to work on Vancouver Island, where the variable soil and the solid foundation layer are located in the basalt,” said project manager Jeffrey Batson.

Among the other equipment, two Bauer MC 96 cranes were used for the cycle, one equipped with the Hydraulic DHG V seizure and one with the BC 48, and three Desander systems of mortar Power processing systems, and one BG 30 for this work. The winter conditions as well as the limited work area on both dams of the ends of the earth have made the work more difficult. In order to successfully face these challenges, the project team relied on innovative technologies and digital tools such as B-Tonic and Virtual Site Installer (VSI).

As a result, it was only possible to monitor the work in real time, but also to adapt the operations accordingly as needed. Power, thanks to the experience of the experienced team on the site as well as the laboratory tests in Germany, says the Power of the plastic concrete quality used for the cutting wall has been improved.

The seismic upgrade of John Hart Dam was described as a milestone from an artistic and environmental point of view. Wide works will help protect regional water supply while reducing the environmental impact at the same time, and Patson says Power was proud of an important contribution in the region with successfully completing the difficult side of upgrading the dam's safety.

The BC Hydro's upgrade project in the John Hart Dam will also include permanent updates of floods and flow, especially a new surplus surface below the road surface above the dam and replace three leaks and relevant businesses, such as the crane system.

Moreover, the new leakage gates and/or that were promoted on the Stratecona, Ladore and John Hart dams in the three system will allow improving the flow regulation in the event of a large earthquake.

Malouli that Damoud Damoud

The Zambizi River recently confirmed the earthquake accidents in the area surrounding the Cariba Dam. The last M4.9 accident occurred on December 23, 2024, with its center, about 19 km from the Cariba Dam at a depth of 10 km. This area is located inside the Kariba tank, directly behind Antelope Island in Zimbabwe.

In a press release, the Authority stated this: “You want to advise the stakeholders and the public in general that earthquakes are primarily activities caused by the tank (RIS) that are not caused not only about their existence, but also fluctuations from the numerous level of water that were reported from that, not limited to the numerous beats that were reported from several DCs. The tanks around the world.”

For the safety of the dam, the authority continued to say that it does not focus on the sizes of earthquakes, but the ground acceleration or vibrations resulting from the event. Vibrations/shake are more affected by characteristics such as the distance and the depth of the earthquake center. Therefore, the earthquake with its size can be smaller, but with the center of the earthquake close to the dam wall it may be more harmful than a large earthquake with the earthquake center located away from the dam wall.

“Within this context,” the Zambizi River Authority said, “The earthquakes that were raised in Cariba, Cavonga and its surrounding areas since the construction of a relatively small Cariba Dam and has not generated a great acceleration or vibrations, causing concern about the safety of the dam wall.”

As part of the emergency preparation and standard operating procedures after unusual accidents, the authority examines the dam and decomposes data from various dam monitoring tools every time there is an earthquake incident. These did not reveal any unusual notes and the dam continued to show the normal behavior that corresponds to the prevailing loading conditions.

The Zambezi River is a bilateral organization jointly owned by the governments of the Zambia and Zimbabwe republics with the basic function of operating, monitoring and regulating the water level in the Cariba reservoir on the Zambizi River.

Cariba's air view of the Zambizi River Basin between Zambia and Zimbabwe. The Zambizi River Authority discusses the recent seismic activity on the safety of the dam station

Seismic activity is very complex, and even with advanced data analysis tools, there are still many unknown factors that affect when and where will strike the earthquake. As such, current efforts focus on improving the understanding of seismic phenomena and developing more advanced tools for discovering and responding to earthquakes when they occur.

This is what Tao Song et Al has set to achieve in its modern paper published in the boundaries in the environmental sciences. The researchers here focus on increasing the integrity of the electrical power plant against earthquakes by predicting the speed of the shear waves that support the machines.

The authors also explain, to assess the potential shear rate of the surrounding rock layers, the VS is a useful tool. This parameter helps to determine the speed with which shear waves are transmitted via the rock layers, which can indicate their stability and subject to earthquakes.

This study examined the importance of the VS teacher in assessing the potential cutting rate of the rock layers surrounding the electrical power plants and how it can be used to ensure its safety and efficiency in areas exposed to earthquakes.

Moreover, researchers say they have suggested a new approach that includes the use of the ELM technology to predict VS and promote seismic safety for hydroelectric power plants. The ELM VS model for soil layers predicts the electromagnet, which is a decisive factor in determining the seismic response to the structure. The expected VS is then used to assess the seismic risks and then design the appropriate safety measures.

In this study, a large collection of data was analyzed from 3200 databases to gain visions about the rock formations of hydroelectric plant institutions. The data set contains information about the measured depth, the type of rock, the gamma rays record, the thermal neutron por, the shallow electrical resistance, the deep electrical resistance, the speed of the pressure wave (VP), and the speed of the cut wave registered during the registration of vertical earthquakes.

The study used four newly developed models and found that the ML-LEM extremist learning model beats both ELM and models, as well as lower external data predictions. Although ELM is simpler and faster than ML-LEM, since it contains only one hidden layer with random weights and does not involve backproPagation, the ML-LEM has a feature of learning more complicated patterns in data due to its multiple hidden layers with non-linear transformations.

Authors believe that this approach shows a promise to predict VS in similar environments, and future research can explore its effectiveness in other data groups and practical application.

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