摘要
高承压水地层中深大基坑的开挖多采用井点降水的方法。由于影响降水的因素较多,使高承压含水层中的降水设计和实施的难度加大。为此,文章利用了FLAC3D的渗流功能模块和正交试验方法,着重分析了隔水帷幕插入深度、降水井深、抽水量、降水井的平面布置、含水层承压水头高和土层渗透系数对井点降水的影响以及各个影响因素的重要性,建议了基坑降水设计的优化步序,研究结果可为深基坑开挖时的降水设计提供指导。
The well-point dewatering method is often used during deep foundation pit excavation in soil layer with high artesian water pressure. However, because of many influence factors it is much difficult to make dewatering design and implementation in such a soil layer. To solve this problem, the seepage function pattern of the software FLAC3D and the orthogonality method are herein applied for analyzing how the different factors, like depth of water-proof wall, depth of pump well, pump output, position of wells, artesian water head and permeability of soil layer, affect the well-point dewatering. Based on the result obtained from the orthogonality tests the optimum design concept is suggested in this paper for dewatering during deep foundation pit excavation.
出处
《云南农业大学学报(自然科学版)》
CAS
CSCD
北大核心
2011年第6期872-877,共6页
Journal of Yunnan Agricultural University:Natural Science
关键词
基坑开挖
承压水
井点降水
正交试验
影响因素
foundation pit excavation
artesian pressure
well-point dewatering
orthogonality test
influence factor