摘要
浸没问题是平原地区水库勘察设计和建设中最重要的水文地质问题,对于常见的冲积成因二元沉积结构的平原地区,我国现行规范采用的卡明斯基法在实际工程应用中存在诸多问题。从黏性土的渗透性规律入手,在"启动水力梯度"的基础上,提出了适用于承压含水层模型的折减系数法的计算公式。以湘江长沙综合枢纽工程的苏托垸地区为研究区,分别应用卡明斯基法、折减系数法和数值法对水库浸没范围进行了预测,并对比分析了3种预测方法的优劣。结果表明:(1)对于堤垸广布的平原地区水库浸没预测,卡明斯基法的预测结果严重偏大;(2)折减系数法考虑了启动水力梯度效应,其预测结果比较符合实际情况,但是只适用于2D线状剖面的浸没计算;(3)数值法可以计算水库浸没的时空分布特征,且适用性广,是平原地区水库浸没预测的理想技术手段。
Immersion is the most important hydrogeological problem in the investigation,design and construction of the plain reservoir.For the common alluvial plain with dual-formation structure,the Kamenski method adopted by the current norm has many problems in practical engineering application.This paper starts with the law of permeability of cohesive soil.Based on ＂initial hydraulic gradient＂,the paper proposes the calculation formula of the reduction factor method suitable for the confined aquifer model.Taking the Sutuoyuan area in the integrated hub project of Xiangjiang in Changsha as an example,the paper predicts the reservoir immersion area by three methods：Kamenski method,reduction factor method and numerical method respectively,and compares the pros and cons among them.The results show that：（1）for the prediction of reservoir immersion in plain areas in which the embankment is widely distributed,the result of Kamenski method is much larger;（2）the reduction factor method takes into account the effect of initial hydraulic gradient,and the prediction results are more in line with the actual situation,but only applicable to the immersion calculation of 2 Dlinear profiles;（3）the numerical method can be used to calculate the spatial and temporal distribution of reservoir immersion and with wide applicability is an ideal technical means for reservoir immersion prediction.
作者
王碧
杜兴武
胡成
罗垚
WANG Bi;DU Xingwu;HU Cheng;LUO Yao(School of Environmental Studies,China University of Geosciences（Wuhan）,Wuhan 430074,China;Hunan Hydro ＆ Power Design Institute,Changsha 410001,China)
出处
《安全与环境工程》
CAS
北大核心
2018年第4期51-57,共7页
Safety and Environmental Engineering
基金
长沙综合枢纽工程基金项目(CSSN-服务-038-06)
关键词
水库浸没
预测方法
二元结构
平原地区
卡明斯基法
折减系数法
数值法
reservoir immersion
predicting methodology
dual-formation structure
plain area
Kamenski method
reduction factor method
numerical method
