国内100 m以上重力坝地基弹性参数与波速分析

Analysis on Elastic Parameter and Wave Velocity of Gravity Dam Foundation with Dam Height over 100 m in China

为了解国内高重力坝赋存的地基情况并为场址波场信息研究提供基础数据,收集国内68座坝高100 m以上重力坝的相关信息,统计分析其地基弹性参数和波速参数的总体特征。结果显示,100 m以上重力坝的数量随着坝高增加迅速减少,国内坝高200 m以上的重力坝共3座。重力坝的空间分布呈现出不均匀性,在西南地区数量显著较多。在地基弹性参数方面,约93%100 m以上重力坝的地基弹性模在6~28 GPa,均值为16.7 GPa;泊松比的分布范围为0.17~0.32;密度的分布范围为2000~2900 kg/m^(3)。在波速方面,约96%的地基纵波波速在1500~3900 m/s,约95%的地基横波波速在800~2300 m/s。纵波波速的均值和标准差分别为2718、639 m/s,横波波速的均值和标准差分别为1574、383 m/s。

To illustrate the foundation conditions of gravity dams over 100 m in China and support wavefield analysis at project sites,this paper collects the foundation parameters of 68 gravity dams to analyze the statistical characteristics of elastic parameters and wave velocity.The result shows that the number of dams decreases rapidly with the height,with 3 gravity dams higher than 200 m.The distribution of gravity dams over 100 m is uneven,with a significant number in the southwest area of China.About 93%of gravity dams are with a foundation elastic modulus of 6 GPa to 28 GPa,and the average value is 16.7 GPa.The Poisson s ratios of foundations are from 0.17 to 0.32.The mass densities of foundations are from 2000 kg/m^(3)to 2900 kg/m^(3).In terms of wave velocities,about 96%of longitudinal wave velocities are from 1500 m/s to 3900 m/s,and about 95%of transverse wave velocities vary from 800 m/s to 2300 m/s.The mean and standard deviation of longitudinal wave velocity are 2718 m/s and 639 m/s,and those of transverse wave velocity are 1574 m/s and 383 m/s.