The Application Research Of Plastic Concrete Anti-seepage Wall To Seepage Reinforcement Between Soil And Rock In Yellow River Embankment

In the application of the actual seepage prevention wall,the plastic concrete is in the three-dimensional stress state and the surrounding stress environment is changing with the fluctuation of the water level.But the performance of plastic concrete mechanics law result from the changing of confining pressure is not clear.To solve the problem,48 sets of the true triaxial compression test of stress-strain full curves and 18 set of the plastic concrete unloading confining pressure stress-strain curve test were carried out.Combining with the properties of plastic concrete raw materials,components to study its axial mechanical properties and damage forms.The effect of permeability on consolidation project is obtained by using numerical analysis software to verify the plastic concrete as impervious material.The main contents are as follows:?1?After the correction to the data from the Confining pressure constant true triaxial test using the scientific strain calculation method,the result shows that the revised peak intensity were lower and the amplitude were 5% 10%;When the minimum principal stress were in the same level,the peak strength of plastic concrete increases with the increase of the intermediate principal stress,but the growth become smaller;The relationship between the peak intensity and different confining pressure is constant,the curve features of after peak has changed from the approximate plasticizing state to appearing an obvious peak value point and significantly lower segment.Based on this,the plastic concrete formula of true triaxial compression destruction can be obtained:?₀=-0.027+1.335?₀-0.133?₀²?2?Through the unloading lateral pressure test of true triaxial compression stress-strain full curves using the plastic concrete,the influence of plastic concrete failure types with different dosage of bentonite were researched under the condition of lateral pressure conditions consistent and uninstall the same side confining pressure;the influence of plastic concrete failure types with different confining pressure conditions were researched under the condition of the same side of proportion of cases and the same unloading confining pressure.The destruction form mainly includes brittle fracture and ductile fracture which were similar to uniaxial test?3?Through the modeling calculation,we can find that after joining plastic concrete cut-off wall the phreatic line is decreased obviously,the pore water pressure,water head and hydraulic gradient are rapidly decreasing in the wall,the seepage velocity of the foundation soil layer and embankment joint are also significantly reduced.When the water level was reducing,the large deformation would appear in slope surface and bottom around the culvert entrance and the maximum deformation was about 2 mm.Meanwhile tensile stress and stress concentration phenomenon appeared in the same place on the stress nephogram.Furthermore,when the water level is reducing,the stress inside wall is mainly with compressive and without the stress concentration and uneven settlement.