Study On The Interaction Of Earth-Rock Dam With Polymer Anti-Seepage Wall Based On Interface Characteristics Under Earthquake

Polymer anti-seepage wall is a new technology for dam danger-elimination reinforcement.Due to the advantages of rapid,high efficiency,durability and good seismic and crack resistance,it has been gradually used in dam seepage prevention and reinforcement engineering.However,the self-vibration frequency,period and other structural dynamic characteristics of earth-rock dam are changed by adding high-polymer anti-seepage wall.And the "root-like" contact state between high-polymer materials and soil also makes the stress state of wall-dam interface more complex.Moreover,the application of the new anti-seepage wall technology in the earthquake area has some problems,such as the law of wall-dam interaction and its seismic response characteristics are not clear,which affect the further popularization and application of the technology in the earthquake area.Based on this,the static and dynamic characteristics of polymer-soil interface,the interaction law between polymer anti-seepage wall and earth-rock dam under the seismic action of earthquake and its seismic response characteristics were studied by means of indoor test,numerical simulation and theoretical analysis in this paper.The main contents are as follows:(1)Based on the self-designed polymer-soil interface test device,the static and dynamic ring shear test of polymer soil interface was carried out.The static and dynamic characteristics of polymer soil interface and its influencing factors were discussed.The effects of bonding state,polymer density,vertical stress and soil type on the static characteristics of polymer-soil interface and related mechanisms were studied.And the law of influence of polymer density,shear amplitude and vertical stress on the dynamic characteristics of polymer-soil interface were discussed.The relevant parameters of the interface between the polymer anti-seepage wall and the earth-rock dam in the numerical model were determined.(2)The interaction model between polymer anti-seepage wall and earth-rock dam was established based on the characteristics of polymer-soil interface.The non-linear interface element was realized by FRIC subprogram.The non-linear interface element was used to simulate the interface characteristics of wall-dam.The rationality of the nonlinear interface element model was verified by comparing the numerical simulation results with the interface ring shear test results.Based on the verified polymer-soil nonlinear interface element,combined with viscoelastic artificial boundary conditions,soil equivalent viscoelastic constitutive model and polymer dynamic viscoelastic constitutive model,the interaction model between polymer anti-seepage wall and earth-rock dam was established.(3)The interaction law and seismic response characteristics of polymer anti-seepage wall and earth-rock dam under the seismic action of earthquake were studied.The rationality and reliability of the wall-dam interaction model were verified by dynamic centrifugal test.Based on the verified numerical model,the change law of acceleration and displacement coordination of polymer anti-seepage wall and adjacent soil under the seismic action of earthquake was studied.And the influence law of anti-seepage body type,seismic acceleration and polymer density on the seismic response coordination of wall-dam was discussed.The structural mode of earth-rock dam with polymer anti-seepage wall was analyzed.The seismic response law of earth-rock dam with polymer anti-seepage wall was studied,and the relevant mechanism was discussed.