The slope is formed by soil, rock, sand and other materials mixed (such as industrial waste, etc.) for fulfilling the embankment for the creation of slope. The physical and mechanical properties of the slope have a great impact on the stability, such as shear strength (internal friction angle, cohesion c) and bulk density (including natural bulk density and saturated bulk density, etc.). The materials also explain the structure of the research which is considered for the purpose of determining the slope instability and also the process of the research can be easily progressed by utilizing the process of the research. Therefore, the structure of the research must consist of these materials and it also explains the appropriate process for determining the appropriate structure of the research. The process also shows the appropriate structure which is used to determine the research process.
The working conditions mainly refer to the external load of the slope, including the load on the top such as a load of vehicles and people acting on the top of the highway embankment, the water pressure behind the dam.
The water flow behind the slope and the change of water level in slopes are important factors affecting the stability of slopes. Besides their effects on the slope, they have an influence on the physical and mechanical indexes of the slope (Yan et al., 1988).
The slope reinforcement is to take artificial measures to transfer the force of sliding to another stability part of the slope to make the whole slope to achieve a new equilibrium state (Zhao, He and Wang, 2003)。
The purposes of studying slope stability are defined to be predicting the failure time, the scale and hazard of slope instability. To take preventive measures such as finding endangered areas and investigation of potential failure, reduction in the geological disasters must be done and making the design of the slope to achieve the purposes of safe, reliable and economic stability. After all, the external factors are analyzed for the betterment of the study.