碾压式沥青混凝土心墙坝三维静动力数值模拟研究  

Study on Static and Dynamic Numerical Simulation of RollerCompacted Asphalt Concrete Core Dam

作　　者：李燕波[1] LI Yan-bo(Xinjiang Survey and Design Institute of Water Resources and Hydropower,Urumqi 830000,China)

机构地区：[1]新疆水利水电勘测设计研究院,乌鲁木齐830000

出　　处：《水利科技与经济》2020年第6期1-8,共8页Water Conservancy Science and Technology and Economy

摘　　要：为研究碾压式沥青混凝土心墙坝施工及运行期的受力特性,以新疆某水利枢纽工程为例,采用非线性邓肯-张E-B模型进行大坝三维有限元静力计算,采用等效线性粘弹性模型进行大坝三维有限元动力计算,采用三维等价结点力法研究坝体地震永久变形,主要研究坝体在静动力条件下坝体和防渗体的应力、变形以及基座与心墙的相对位移。结果表明,静力条件下,坝体最大沉降约占坝高的0.27%,蓄水后心墙最大压应力较竣工期减少约14.2%,蓄水后心墙顺河向最大位移较竣工期增大约2.6倍、沿坝轴线方向减小约13.3%;动力条件下,坝体地震沉降约占坝高的0.09%,地震发生时坝体最大横断面心墙出现拉应力,其值约为最大压应力的9.5%,地震结束后心墙最大压应力减小约16.7%,未出现拉应力,地震后坝体顺河向发生永久位移,心墙最大压应力较地震前增大1.9%,心墙顺河向最大位移较地震前增大约15.4%、沿坝轴线方向减小约11.5%。In order to study the mechanical characteristics of roller compacted asphalt concrete core dam during construction and operation period,taking a water conservancy project in Xinjiang as an example,the nonlinear Duncan zhange-b model is used for the static calculation of three-dimensional finite element of the dam,the equivalent linear viscoelastic model is used for the dynamic calculation of three-dimensional finite element of the dam,and the three-dimensional equivalent nodal force method is used for the study of the earthquake permanent deformation of the dam The stress and deformation of dam body and impervious body and the relative displacement of foundation and core wall under static and dynamic conditions.The results show that under static condition,the maximum settlement of the dam body accounts for about 0.27%of the dam height,the maximum compressive stress of the core wall after impoundment decreases by about 14.2%compared with the completion period,the maximum displacement of the core wall along the river after impoundment increases by about 2.6 times compared with the completion period,and decreases by about 13.3%along the dam axis;under dynamic condition,the seismic settlement of the dam body accounts for about 0.09%of the dam height,and the core wall of the maximum cross section of the dam body appears tensile stress when the earthquake occurs The stress is about 9.5%of the maximum compressive stress.After the earthquake,the maximum compressive stress of the core wall decreases by about 16.7%without tensile stress.After the earthquake,the dam body displaces permanently along the river.The maximum compressive stress of the core wall increases by 1.9%compared with that before the earthquake.The maximum displacement of the core wall along the river increases by about 15.4%compared with that before the earthquake,and decreases by about 11.5%along the dam axis.

关 键 词：碾压式 沥青混凝土 心墙坝 受力特性 非线性 

分 类 号：TV642[水利工程—水利水电工程]