武汉地区防洪控制区水力梯度实测研究
Field Measurement Study of Hydraulic Gradient in Flood Control Area of Wuhan Area
权威 1陈律 2熊宗海 3朱浦栋1
作者信息
- 1. 中南勘察基础工程有限公司,湖北武汉 430081
- 2. 中机三勘岩土工程有限公司,湖北武汉 430030
- 3. 武汉丰达地质工程有限公司,湖北武汉 430074
- 折叠
摘要
根据《建筑地基基础技术规范》(DB 42/242-2014)规定,武汉地区防洪控制区内建议承压水头坡降为0.5%～0.8%,由此可近似推导防洪控制区内抗浮水位及基坑降水承压水水头.2003 年以来,由于长江补给两岸时长的大幅缩短及城市建设大规模基坑降水,防洪控制区内相应水力梯度也发生较大改变,根据防洪控制区内 40 个项目水位观测统计数据,控制区内的实测水力梯度与规范建议值存在较大偏差,与长江水位、项目距离呈非线性衰减关系.通过数据分析,推导出丰水期峰值水力梯度、丰水期平均水力梯度、枯水期平均水力梯度曲线方程,并获得了实际项目验证.研究结论可为规范修订提供参考,同时为防洪控制区内抗浮水位选取及基坑工程降水提供支持.
Abstract
According to"Technical Code for Building Foundation"(DB 42/242-2014),the recommended slope of confined water head in the flood control area of Wuhan is 0.5%～0.8%,from which the anti-floating water level in the flood control area and the confined water head of foundation pit dewatering can be approximately deduced.However,since 2003,due to the substantial shorten-ing of the supply time on both sides of the Yangtze River and the large-scale foundation pit dewatering in urban construction,the cor-responding hydraulic gradient in the flood control area has also changed greatly.Combined with the water level observation and statist-ical data of 40 projects in the flood control area,there is a large deviation between the measured hydraulic gradient in the control area and the recommended value of the code,and there is a non-linear attenuation relationship with the water level of the Yangtze River and the distance of the project.Through data analysis,the curve equations of peak hydraulic gradient in high water period,average hydraul-ic gradient in high water period and average hydraulic gradient in low water period were derived and verified by the project.The con-clusion can provide reference for the revision of the code,and provide support for the selection of anti-floating water level in flood con-trol area and dewatering of foundation pit engineering.
关键词
防洪控制区/水力梯度/抗浮水位/基坑降水Key words
flood control area/hydraulic gradient/anti-floating water level/foundation pit dewatering引用本文复制引用
出版年
2024
NETL
NSTL
万方数据