Water power resources in Brazil is rich, famous Amazon, Parana River and Sao Francisco River three river systems run through it. In Brazil, hydropower has occupied large composition in all electricity-generation system. With increase of economy every year, energy supply needs to be increased accordingly. So, there are plenty new hydropower engineering is to be constructed.
Santo Antonio Hydropower Station is the fourth largest hydropower station in Brazil, located on Madeira River in Rondonia, Brazil. Madeira River is the main tributary of Amazon River and its average flow is 18ooo m³/s with obvious seasonality.
This project includes 4 plants and 2 spillways. Main dam segment belongs to RCC dam and two ends belongs to earth-filled dam. 44 bulb tubular turbine generating sets will be installed, they are total 3568 MW and predicted to finish installation in November this year.
The bedrock of dam is rough, cracks and discontinuous surface rock mass can be seen everywhere, which has high risk of piping.
When constructing hydropower station, cost reduction and research of new technology will also be followed-up, which are believed having huge potential. Self drilling anchor can put drilling, grouting and anchoring at the same time, is the most convenient and stable supporting method. In the long-term, self drilling anchor has advantages of economy, endurance and security.
Metis® self drilling anchor is a hollow anchor, having the new integrated functions of drilling, grouting, and anchoring. It has the extended feature because self drilling anchor bolt can be lengthened by using coupling. It can be applied in the basement, under the bridge, the river, and a narrow construction environment, and now widely used in tunnels, mining, slope and other projects. It is suitable for hole collapsed areas and disease treatment, such as, reinforcing existing structures, grouting and filling cracks, etc. There are two specific cases in this article about the applications of self drilling anchor to illustrate the reinforcement effect.
Case 1. Beijing-Qinhuangdao Expressway slope reinforced with self drilling anchors
The slope is very unstable because rock fractures with a layer of mud and expansile kaolin are easy to expand and spall by rain, which has poor resistance to weather. It has achieved good effect in three years after using the reinforcement method of a self drilling anchor and jet anchor net. Click here and learn more.
With the increase of self drilling anchor density, strength coefficient is also increasing. When self drilling anchor density is constant, the degree of enhancement of self drilling anchor residual strength is greater than the degree of enhancement of the rock peak intensity. It can effectively improve the mechanical parameters of the original rock. And with the increase of self drilling anchor density, self drilling anchor peak can be significantly improved. Furthermore, it can effectively reduce the plastic zone of surrounding rock, broken radius and displacement of roadway to maintain surrounding rock stable.
As we know, it is inevitable to tunnel in the construction of railways, over the mountains. Given the support role of self drilling anchor in the surrounding rock,Metis® self drilling anchor is often used in the following aspects：
· Stabilization of tunnel portals
· Face stabilization
· Root piling
· Radial systematic anchoring