Stability Characteristic Study Of Large Water-level Harbor Bank Slope In Inland River

There are many rivers in southwest China,the water level will have changed a lot with the seasons.The changes in water level periodically will have a great effect on the stability of the Coast ports slope,mechanical properties of slope engineering and strength parameters will have a lot change.We establish slope model for the Simulation test based on the geological conditions in the port of the guoyuo.This model can help us to have a further research for the time-varying stability,instability mechanism and failure mode of the port slope,so that it can provide a reference for the similar projects designed.By means of establishing slope model to simulate slope stability characteristics in the cyclical fluctuations of large water level,the paper analyzes and summarizes the variation of slope strength parameters and deformation parameters,and the instability mechanism and failure mode.Using the finite element numerical simulation compared with the experimental results,and using reliability theory and practical method to have a new slope stability analysis.The thesis and conclusions in this paper are as follows:(1)Conduct indoor port slope model test(soil slope and rock slope on the surface of the typical structure)in the cyclical fluctuations of large water level.By sampling measurement to analysis how the slope engineering mechanics parameters vary with time,it had a weak model under the water cycle changes.Test the slope stress and the water level in the slope,the pressure changes within the soil slope is divided into“convex” shaped and “concave” form change patterms.And the water level in the soil slope has great lag phenomenon;According to the stress change rule of rock slope,it can be divided into three regions:”rise-smooth-up” area,”rise-smooth-fall” area and“rise-smooth-smooth” area.(2)Conduct port slope the finite element numerical simulation(soil slope and rock slope on the surface of the typical structure)in the cyclical fluctuations of large water level.Annlysis the slope stability evolution effect,and it can accord with the results of model test.Studying the characteristics of time-varying stability of the slope,the instability mechanism and failure model.The soil slope will destroy from slope foot along the slope to the slope top,the soil slope can have a better stability if it has a smaller slope angle.The rock slope which its two groups structural planes are verticalwill destroy from slope foot to the slope top,causing sliding along the directing of the slope.The rock slope which its two groups structural planes are intersecting will destroy from slope top to the slope foot,this will make the horizontal rock stratum slide.(3)Study the mountains rivers port slope time-varying stability practical analysis method based on reliability theory.By the method of Rosenblueth,we conmbine the probabilistic intensity parameterand calculate the safety factor of reliability.This can help us to have the further understanding for the accuracy of slope factor.And provide some certain reference baisi for the slope reinforcement in practical engineering and the instability time predicting.