摘要
本文结合某土石坝测压管水位的多年观测资料,给出一种有限元离散——函数极值优化耦合计算求解的渗流反分析方法,对该坝多种不同透水性介质的渗透系数比值进行了最优解反演估计与假预报反馈识别,进而详细地反馈评估了大坝整个渗流场的实际性态和势态。认为对整个渗流场起控制性作用的是坝基天然阻水层O_z^(12)的隔水性,因坝基水平细砂夹层的存在,大大地限制了上游“透水窗”局部入渗源的不利影响程度和范围;下游面坝基回填砂砾料褥垫层的排水降渗作用明显,能普遍降低坝体浸润线位置2.0m左右。
On the basis of many years in situ measured piezometric data of an earth-rock dam the pa- per presents a research procedure of finite element discretization=function extremum optimization cou- pled calculation for back analysis of seepage flows,The ratio of the permeability coefficients of the media with different permeabilities in the dam is optimally back evaluated and calibrated with the pseu- do-forecasting feed back data fitting.Then,the corresponding feedback analysis of the seepage flow behaviour and its trend are formulated.It turns out that the relative impervious rockbed O_2^(12) beneath the foundation alluvium has the controlling influnce on the behaviour of the entire seepage flow field. Owing to the existence of the horizontal fine sand layer in the alluvium,the influence of the upstream “Wator Penetration Window”is strongly localized.The downstream bottom drainage sand blanker has an evident relief effect.It can generally lower the position of the phreatic line in the dam by 2.0m.
出处
《河海大学学报（自然科学版）》
CAS
CSCD
1991年第6期49-56,共8页
Journal of Hohai University(Natural Sciences)
基金
河海大学科研基金
关键词
土石坝
渗流
反馈分析
渗流反问题
seepage flow
permeability coefficient
inverse problem of seepage flow
inversion evaluation of parameters
feedback analysis
