# Comprehensive Method to Test the Stability of High Bedding Rock Slope Subjected to Atomized Rain
## 2 Comprehensive Method for High Bedding Rock Slope  
In the high rock slopes of high dam projects, landslides often occur after heavy rainfall or a long period of rain. In particular, during flood discharge atomized rain, the rock slope stability is controlled by rain infiltration, atomized rain infiltration, and groundwater action. The actions of water on the rock slope mainly involve increasing the unit weight of the rock mass, reducing the mechanical parameters of the structural planes, and varying groundwater seepage.  
For high bedding rock slopes, the actions of rain infiltration and groundwater seepage can be simplified to increase the sliding force and reduce the mechanical parameters of the structural planes. Therefore, in this comprehensive method, the mechanical parameter reduction of structural planes is simulated by strength reduction materials, and the increase in sliding forces is simulated by the steel frame lifting technique.  
The theory of the comprehensive method includes the overloading method and the strength reduction method [20; 21].  
In the overloading method, rock mass loads are gradually increased until global failure of slope occurs, while the mechanical parameters of rock mass and structural plane are kept constant [12; 13; 14; 15; 16; 17]. The overload ratios obtained from the tests are called the overload safety factor. The centrifuge method demands not only stable and reliable loading equipment but also requires customized deformation monitoring devices during the overloading process. Therefore, this method is costly to perform and lacks monitoring reusability. The steel frame lifting technique is adopted to study the failure mechanism of slopes by increasing the rock mass sliding force. Although the overloading method considers a single factor of increased sliding forces of rock mass, it is able to investigate the influence of sliding forces of rock mass on the slope stability and find the weak parts of the slope. Moreover, this method can be applied together with other methods (such as numerical simulation), which provides reference for analysis and verification of the test results.  
In the strength reduction method, the mechanical parameters of the structural planes are gradually reduced until global failure of slope occurs, while the slope load (rock mass deadweight) is kept constant. The strength reduction ratio obtained from the test is called the strength reserve factor. The advantage of this method is that it is convenient to adjust the local mechanical parameters of structural planes. This method is easy to implement in numerical simulation. However, each slope geomechanical model is supposed to be performed corresponding to any single group of material parameters of the structural planes. In order to obtain the strength reserve factor, various model tests need to be performed corresponding to the different mechanical parameters. These studies are costly to perform, and few such studies have been undertaken.  
In order to reduce the mechanical parameters of the structural planes, numerous material tests have been conducted to develop strength reduction materials. Strength reduction materials are developed by adding a fusible polymer material to a conventional structural material. The \(f^{\prime}\) and \(c^{\prime}\) values of the material will reduce with the increase in temperature from the heating system embedded in the model. Thus, this material can simulate the strength reduction of structural planes under rain.  
In the comprehensive method proposed in this paper, the rock mass loads are first kept constant. The mechanical parameters of the structural planes are then gradually reduced to a specified value, and the model steel frame is finally lifted until global failure of slope occurs. Therefore, the mechanical parameter reduction of the structural planes can be simulated by strength reduction materials, and the sliding forces can be simulated by the steel frame lifting technique.