Study On Seismic Response Of Earth-rock Dam With Polymer Anti-seepage Wall Based On Meso Fluid-solid Coupling

As a new anti-seepage and reinforcement technology,polymer anti-seepage wall has the advantages of low cost,convenient construction and environmental protection.It has been gradually applied to the danger removal and reinforcement engineering of earth-rock dam.A large number of earth-rock dams in China are located in the earthquake area.Under the earthquake,the meso fluid-solid coupling effect will occur between soil skeleton and pore water,which is easy to cause a series of dam safety problems,such as dynamic instability of dam slope and dynamic water splitting of antiseepage wall.Therefore,it is of great significance to study the seismic response of earth-rock dam with polymer anti-seepage wall based on meso fluid-solid coupling.The theoretical analysis,model test and numerical calculation are combined in this paper.And the meso dynamic fluid-solid coupling model of earth-rock dam with polymer anti-seepage wall was established based on Biot’s dynamic consolidation theory.The seismic response and seismic stability of earth-rock dam with polymer antiseepage wall based on meso fluid-solid coupling were studied.The main contents are as follows:(1)The meso dynamic fluid-solid coupling model of earth-rock dam with polymer anti-seepage wall was established.Based on Biot’s dynamic consolidation theory and fully nonlinear method,the meso dynamic fluid-solid coupling model of earth-rock dam with polymer anti-seepage wall was established by combining the definite solution conditions,dynamic boundary conditions and the secondary development of polymer material dynamic viscoelastic constitutive model program;The reliability and rationality of the numerical model were verified by the dynamic centrifugal test of earth-rock dam with polymer anti-seepage wall.(2)The static fluid-solid coupling analysis of earth-rock dam with polymer antiseepage wall was carried out.Based on the static fluid-solid coupling model of earthrock dam with polymer anti-seepage wall,the similarities and differences of stress field and seepage field of earth-rock dam under coupling and non coupling were compared and analyzed,and the influence of fluid-solid coupling on the stress and deformation law of polymer anti-seepage wall was discusse;The stress and deformation law of earth-rock dam with polymer anti-seepage wall and concrete anti-seepage wall under fluid-solid coupling was studied;The influence of water level change on the stress and displacement of polymer anti-seepage wall and the stress field and seepage field of earth-rock dam is analyzed.(3)The seismic response characteristics and seismic stability of earth-rock dam with polymer anti-seepage wall under meso fluid-solid coupling were studied.The seismic response of earth-rock dam with polymer anti-seepage wall was analyzed by using the verified dynamic fluid-solid coupling model of wall dam;The influence of fluid-solid coupling on the stress field and displacement field of earth-rock dam was discussed;The seismic response characteristics of earth-rock dam with polymer antiseepage wall under different water levels were studied;The effects of polymer material density and anti-seepage wall thickness on the acceleration,dynamic stress and displacement law of polymer anti-seepage wall were analyzed.Combined with dynamic centrifugal test,the seismic safety and related mechanism of earth-rock dam with polymer anti-seepage wall and earth-rock dam with concrete anti-seepage wall were studied.