截排减压抗浮多井系统简化计算及设计方法  

Simplified calculation and design method of multi-well system for anti-uplifting based on intercepting and discharging water

作　　者：朱东风[1,2] 曹洪 骆冠勇[1] 潘泓[1] 罗赤宇[2] ZHU Dong-feng;CAO Hong;LUO Guan-yong;PAN Hong;LUO Chi-yu(School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510640,China;Guangdong Architectural Design and Research Institute Co.,Ltd.,Guangzhou 510010,China)

机构地区：[1]华南理工大学土木与交通学院,广东广州510640 [2]广东省建筑设计研究院有限公司,广东广州510010

出　　处：《岩土工程学报》2021年第11期1986-1993,共8页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金面上项目(51978282);广东省自然科学基金项目(2018A030313383,2020A1515010583)。

摘　　要：对于截排减压抗浮系统中的减压井群(多井系统),目前除采用数值法进行渗流分析外,尚无实用的简化计算方法,不利于推广使用。鉴于此,提出了简化计算方法:对于圆形止水帷幕内侧均匀分布的多井系统,假定止水帷幕内侧边界水头为常数,通过共形映射推导得到多井系统的水头分布;对于非圆形止水帷幕,可将其等效为圆形近似求解;采用阻力系数法,在考虑止水帷幕透水和绕渗的基础上,将止水帷幕内外侧渗流场串联起来,求解得到总流量。经算例验证,简化算法与有限元法相比结果差距较小,且仅需提供不多的几何参数,即可求得较精确的结果。在排水减压抗浮设计时,控制板底水头和井周水力坡降是关键,为兼顾安全性和经济性,需对参数n,r,h_(w)及r_(w)反复调整以达到最佳效果。For the multi-well system in the anti-uplifting system based on intercepting and discharging water,there is no practical simplified method except the numerical method for seepage analysis,which is not conducive to its application.In view of this,a simplified method is proposed.The idea is as follows:for the multi-well system with even distribution inside the circular cut-off wall,the hydraulic head on the inside boundary of the cut-off wall is assumed to be constant,and the distribution of the hydraulic head of the multi-well system is deduced through conformal mapping.For the non-circular cut-off wall,it can be equivalent to a circle to obtain an approximate solution.The resistance coefficient method is adopted to connect the inner and outer seepage fields of the cut-off wall in series on the basis of considering the water leakage and by-pass seepage of the cut-off wall,and the total flow can be obtained.After verification,a comparison with the finite element method shows that the difference between the simplified algorithm and the finite element method is smaller,and it only needs to provide a few geometric parameters to get more accurate results.The control of the hydraulic head at the bottom of the floor and the hydraulic slope around the well are the key points in the anti-uplifting design process based on drainage decompression.Moreover,in order to give consideration of both safety and economy,parameters n,r,hw and rw need to be adjusted repeatedly to achieve the best effect.

关 键 词：抗浮 渗流 多井系统 止水帷幕 共形映射 

分 类 号：TU43[建筑科学—岩土工程]