Analysis And Research On Slope Stability Of CB Hydroelectric Engineering Slag Yard

In the construction process of water conservancy projects,the problem of slope safety and stability must be paid attention to before construction,and the problem of slope stability not only affects the construction progress of water conservancy projects,but also affects the safety of surrounding people,so the safety of slopes has important practical significance and engineering value.This paper takes the slag yard generated by the construction of CB hydropower project as the research object,and analyzes and calculates the stability of slope under different working conditions by using ABAQUS software,Geostudio software numerical simulation and limit equilibrium method according to its engineering geology and hydrogeological background.The main research contents are as follows:(1)According to the actual topography and geomorphology and hydrogeological conditions of the project,the mechanical properties and recommended values of various materials in the slag yard are analyzed and introduced in detail;The finite element software ABAQUS is used to establish a three-dimensional model,and the process of slag slope stacking is simulated by using the life and death element method,the three-layer slag slope of the slag yard slope is numerically simulated,and its stability is verified by the finite element strength reduction method,its safety and stability coefficient is calculated,and its parameter sensitivity is considered through calculation.The results show that the results of the slope safety and stability coefficient meet the requirements of the specification,and there is an obvious plastic penetration zone in the top of the slag pile near the riverside until the second cover layer in the river channel,and the slag body has a tendency to slide instability from the right bank to the valley.(2)Through the SEEP/W seepage module in Geostudio software,the simulation calculation of rainfall infiltration of the slag field slope was carried out,and the seepage characteristics of each observation point of the slag yard slope under three working conditions of heavy rain,heavy rainfall and exceptionally heavy rain were calculated respectively,and the calculation results showed that the same rainfall intensity had roughly the same effect on the pore water pressure and volumetric water content of the slope soil.The greater the intensity of heavy rainfall,the more drastic the pore water pressure and volume water content of the slag field slope,and the faster the saturation of each observation point.(3)Using the limit equilibrium method,the slip surface and safety stability coefficient caused by slope instability were calculated.The results show that under different rainstorm conditions,the greater the intensity of heavy rainfall,the greater the depth of rainfall infiltration,so the deeper the critical sliding surface and the larger the sliding surface area.Under the same rainfall intensity,the safety and stability coefficient continued to decrease,and after the rainfall ended,it gradually increased and finally stabilized.The general trend is that the greater the intensity of heavy rainfall,the smaller the safety and stability coefficient.Under different rainstorm conditions,the greater the intensity of the rainstorm,the faster the slope safety and stability coefficient decreases.At the same time,the safety and stability coefficient of the slope under the three rainstorm conditions meet the requirements of the specification.