摘要
文中以江底强渗透地层冻结工程为背景,应用同位素技术测试地下水流速和流向,根据测量结果评估此处地下水对冻结工程的影响。各测点深度的地下水流速最大值2.46m/d,最小0.10m/d;地下水的流向方位角的变化范围为126°~175°,总体向东南方向流动。此值超过规程中2m/d的要求,但超过不多,因此本工程采取了增加冻结帷幕厚度,加强冻结,并在冻结帷幕迎水面设置测温孔,监测冻结帷幕薄弱面的发展等措施。如果地下水流速过大,且超过10m/d,正常冻结则无法实现,参考围堰的形式,提出了一种复合加固工法:外侧围堰止水+内侧冷冻法加固。
Based on the freezing project of strong permeability stratum at the bottom of the river, this paper applies isotope technology to test the velocity and flow direction of groundwater, and evaluates the influence of groundwater on the freezing project according to the measurement results. The maximum value of groundwater velocity is 2.46 m/d and the minimum value is 0.10 m/d. The azimuth angle of groundwater flow varies from 126°to 175°. In general, it flows southeast. This value exceeds the requirement of 2 m/d in the regulations, but not much. Therefore, the project adopts measures such as increasing the thickness of the freezing curtain, strengthening the freezing, setting temperature measuring holes on the upstream surface of the freezing curtain, and monitoring the development of the weak surface of the freezing curtain. If the groundwater velocity is too high, even exceeding 10 m/d, normal freezing cannot be achieved. Referring to the form of the cofferdam, a composite reinforcement method is proposed: outer cofferdam water stop + inner freezing method reinforcement.
作者
刘娟
Liu Juan(School of Civil Engineering and Architecture,Yancheng Polytechnic,Yancheng,Jiangsu 224005)
出处
《江西建材》
2021年第8期193-195,共3页
Jiangxi Building Materials
关键词
强渗透地层
地下水流速
冻结法
可行性分析
Strong permeability stratum
Groundwater velocity
Freezing method
Feasibility analysis
