摘要
水库初次蓄水速度直接影响土石坝的渗流安全,水位上升使得坝体内应力场复杂多变,影响渗流性态,而忽略应力场影响对渗流分析易造成偏差。基于饱和-非饱和土渗流理论,在考虑初始应力场和渗流场的基础上针对蓄水速度对渗流场的影响进行数值模拟,并对比和研究了蓄水过程中考虑和不考虑应力场影响下的渗流性态。结果表明,蓄水速度较慢时,应力对各水力要素影响不明显,提高蓄水速度,心墙上游局部存在较大的水力梯度,孔隙水压力突变并集中分布,对坝体不利,考虑应力耦合影响计算结果偏于安全。因此,初次蓄水渗流分析有必要考虑应力场的影响,并严格控制初次蓄水速度。
The initial impounding speed directly affects the seepage safety of the earth-rock dam,w ater rising makes the st ressfield of the dam complicated and changeable,it may impact seepage state,while ignoring the influence of stress field on the seepage analysis is easy to cause some deviation.Based on the satur ated unsaturated seepage theory,In consideration of the initialst ress field and seepage field,analy sis the influence of seepage state with different impounding speed by using numerical simulation,then compared and studied seepage behavior under the influence of stress field.The results show that at slow impoundingspeed,the stress has inconspicuous influence on the hydraulic factors.Increasing im pounding speed then local existence of large hydraulic gradient,pore water pressure mutated and clustered,these adverse to the dam,the calculat ion result is safer when considering the seepag e-stress coupling.Therefore,it is necessary to consider the influence of the stress field on the first water storage seepage analysis,and strictly control the initial water impounding speed.
作者
尹伟强
傅琼华
高江林
周清勇
彭圣军
YIN Wei-qiang;FU Qiong-hua;GAO Jiang-lin;ZHOU Qing-yong;PENG Sheng-jun(School of Civil Engineering and Architecture , Nanchang University , Nanchang 330029, China;Jiangxi Provincial Institute of Water Science , Nanchang 330029, China)
出处
《南水北调与水利科技》
CSCD
北大核心
2017年第4期168-174,共7页
South-to-North Water Transfers and Water Science & Technology
基金
流域水循环模拟与调控国家重点实验室开放基金项目(IWHR-SKL-201518)~~
关键词
心墙坝
流-固耦合
蓄水速度
渗流性态
core dam
seepag e-stress coupling
impounding speed
seepage state
