摘要
澜沧江上游某电站坝前大面积发育倾倒变形体,边坡中的地下水对其稳定性有重大影响。为此,运用二维饱和—非饱和渗流有限元分析程序SEEP/W,并联合极限平衡法分析库水位变动期间库水位变动速率对倾倒变形体边坡渗流场及其稳定性的影响机理及规律。结果表明,水位变动速率对倾倒变形体的瞬时渗流场有较大影响,坡体表面形态在水位变动期间,对其水力梯度影响较为明显;水位上升阶段,水位变动速率与倾倒变形体稳定性呈现正相关关系,水位上升速率由0.5 m/d增大至5 m/d,稳定性系数上升了0.7%~2.0%,而水位下降阶段,水位变动速率与其呈现负相关关系,堆积体稳定性系数降低0.6%~1.6%,且其存在临界速率(2.0m/d)、水位(死水位以上3/8坡高处),速率、水位超过其临界值之后,稳定性变幅明显放缓甚至出现回升。
The large area development of a power station in the upper reaches of the Lancangjiang River has been fallen in the front of the dam deformation.The groundwater has a significant impact on the stability of slope.Two-dimensional saturated-unsaturated seepage finite element analysis program SEEP/W and limit equilibrium method analysis were used to analyze the influence of water level change rate on the seepage field and stability of the toppling slope deformation.Research results show that the change of water level of toppling deformation has important impact on the transient seepage field,and the slope surface morphology during the water level change has obvious impact on the hydraulic gradient.In water level rising stage,the rate and the stability of toppling deformation bodies appears positive correlation,the rise of water level increased from 0.5to 5m/d as well as the stability coefficient increased by 0.7%-2.0%;in the water level decline phase,the rate and the stability of toppling deformation bodies appears negative correlation,stability coefficient of deposit reduced by 0.6%-1.6%,and it exists the critical speed（2m/d）and water level（above 3/8height of dead water level）;when the rate and water level are greater than their critical values,the stability range is slowdown even rebounding.
出处
《水电能源科学》
北大核心
2017年第2期143-147,共5页
Water Resources and Power
基金
中国地质调查局西南深切河谷地区斜坡地质灾害调查评价工作(12120113010500)
国家自然科学基金项目(41272332)
关键词
倾倒变形体
库水位变动速率
渗流
稳定性
toppling deformation
water level change rate
seepage
stability
