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[an error occurred while processing this directive]Numerical Simulation Study of Seepage Stability of Mudstone Slope with Dif-ferent Rainfall Types Coupled with Sudden Drop of Reservoir Water Level
Received date: 2018-08-02
Revised date: 2018-09-21
Online published: 2018-10-31
In order to study the seepage characteristics and stability law of mudstone slope under the coupling of sudden drop of reservoir water level and different rainfall types,based on the unsaturated rock mass theory and Hoek-Brown criterion,the expression of slope stability coefficient under the coupling of reservoir water level and rainfall was derived by using limit equilibrium theory,and numerical simulation of mudstone slope was carried out by using Geo-slope software.The results show that the pore pressure decreases first and then remains unchanged when the reservoir water level drops suddenly.The farther the monitoring point is from the reservoir bank,the smaller the variation amplitude of pore pressure is.The slope stability coefficient decreases first and then increases with time,and then remains unchanged.The larger the reservoir water level dropping rate is,the smaller the minimum stability coefficient is and the earlier it occurs.The pore pressure increases first and then decreases under the condition of different static reservoir water level coupling different types of rainfall.The higher the static reservoir water level is,the larger the overall pore pressure is.When the reservoir water level drops suddenly and encounters occasional rainfall,the overall trend of pore pressure in slope decreases gradually and rises abruptly in the process of rainfall.The minimum stability coefficient is the smallest when the mean rainfall occurs at the 24~26 d of the sudden drop of the reservoir water level.The research results provide a reference for correctly understanding stability law of rock slope under the condition of sudden drop of reservoir water level coupled with rainfall.
Bo PENG . Numerical Simulation Study of Seepage Stability of Mudstone Slope with Dif-ferent Rainfall Types Coupled with Sudden Drop of Reservoir Water Level[J]. Gold Science and Technology, 2018 , 26(5) : 647 -655 . DOI: 10.11872/j.issn.1005-2518.2018.05.647
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