| The development of hydropower projects is conducive to accelerating the construction of a national clean energy system,is a strong support for China’s energy security,and is also an important guarantee for completing the task of "carbon peak and carbon neutral" on time.The construction of high dam is the key link in hydropower development.The core wall dam occupies an important position in the development of high dam construction in China by virtue of its good adaptability of foundation and economy of building materials.In recent years,changheba(240m),Nuozhadu(262m),Lianghekou(295m)and other 200 m clay core DAMS have been built successively,and shuangjiangkou(314m)and RM(315m)300m clay core DAMS have entered the planning and design stage,and the record of dam height has been constantly updated.However,as the exploitable dam sites are often located in earthquake zones,once a dam is wrecked,it will not only cause bad economic and social impacts,but also cause irreparable loss of life and property in related secondary disasters.Therefore,it is very necessary to carry out the study of the core dam with magnitude 300 to reduce the risk of structural earthquake damage.Based on the key project of national natural science fund "the meizoseismal area is 300 meters high core wall rockfill dam earthquake damage evolution mechanism,seismic performance and the engineering measures research"(U1965206),youth fund of national natural science fund project "considering complex valley dam-foundation interaction of high earth-rock DAMS fine dynamic analysis"(52009018),The Project supported by the Fundamental Research Funds for The Central Universities(DUT21TD106)carried out the following work in numerical simulation with RM clay core wall dam as the engineering background:(1)Aiming at the problems of cumbersome and time-consuming pre-processing of large earth-rock dam engineering simulation calculation,a high-performance cross-scale refined modeling method based on BIM-Octree is developed.This method not only greatly reduces the pre-processing time,but also takes into account the computational efficiency and model accuracy.It is an effective cross-scale pre-processing method.At the same time,a fast and fine modeling method for geotechnical engineering considering spatial anisotropic arched tunnel structure is proposed,which can realize a good transition between arched gallery and clay core wall,and provide a strong support for fine analysis of monitoring gallery in dam.The above two methods efficiently completed the pre-processing work of RM engineering simulation calculation.(2)Use large triaxial test parameters,for GEODYNA computing platform,the static and dynamic calculation for RM engineering of clay core wall rockfill dam,dam are summarized,the deformation and stress of the core wall,gallery structure characteristic,summarizes the structure of tangential momentum with wrong method to squeeze the open amount,and the spectrum characteristics of dam,filtering effect,lash effect has carried on the deep discussion.(3)Finally,the influence of joint filling material properties on gallery stress and normal deformation of structural joints is studied.The results show that the normal deformation of the lower gallery is larger than that of the upper gallery during filling water storage,and the normal deformation of the upper gallery is larger than that of the lower gallery during earthquake.In the case of no tensile damage to the water stop,the soft filling material is more conducive to releasing the extrusion stress of the gallery. |
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