Problems and prevention methods of slope stability in open-pit mines

3.2 Adjustment of slope bottom drainage system layout in mining area slope stability will be seriously threatened by mining bottom breaking technology. In order to control landslide in mining area, drainage measures need to be fully taken. At present, the detection method of slope bottom drainage in mining area is usually adopted by adjusting slope value by platform. First of all, the slope value of the platform at the bottom of the mine slope should be detected, and then the slope and direction of the drainage system should be rationally designed, and finally the water that passes the bottom of the stope slope should be discharged.

3.3 Strengthening the construction of protective facilities The staff should take effective measures to control landslide disasters in combination with the actual needs of geological disaster control projects and the actual situation of slopes, and set up targeted protective facilities. In landslide control, scientific and reasonable protection facilities play a very important role, among which the simplest operation and the most obvious protection effect is the protective retaining wall, which has been widely used in slope control. Usually, the staff need to set a retaining wall below the landslide section to prevent landslide disasters. With the help of the retaining wall, the impact generated when the landslide slides can be blocked and the harm caused by the landslide can be minimized.

3.4 Prestressed anchorage Prestressed anchor cable and prestressed anchor beam are often used as treatment measures for landslide in open-pit mining, but there are still some shortcomings in the actual application process of this technology. For example, an open-pit mine adopts stress anchor cable technology to control the slope landslide in this area, which has great advantages in the investigation of the state of the slide body and the hydrogeological state, and can realize the effect of stabilizing the rock formation in the cave. After drilling the hole, the prestressed anchor rod is inserted and fixed to achieve the function of prestressed anchorage, and then the concrete is poured to replace the rock and soil mass of the fractured structure and the loose structure, so as to improve the mechanical strength of the rock mass. At the same time, this technology can prevent local picture penetration problems. It is usually equipped with about 40 steel bars, and the rebar connecting sleeve is connected to generate 8000kN tensile force and 7000kN shear resistance full-length viscose bolt. The section of the cavity section and the fault position is expanded to form a hole plug, which can improve the reinforcement effect of the rod body. When designing prestressed reinforced concrete anchorage structure, it is usually 25m in size and 60m in depth. Rebar is used for tension reinforcement, Φ16 rebar is selected as stirrup, C20 concrete is used to cast in the cave, M30 cement mortar is used for secondary grouting, and 4 prestressed anchor cables of 2700kN are used to fix the cave. The anchorage section with a length of about 12m, a passive tensile force of 10000kN and an active prestressing force of 10800kN was adopted to effectively control the landslide problem.