根据武汉地区长江三级阶地的地层特点,分别从泄水降压技术在实际工程中的应用、盲沟泄水降压试验模型的理论分析和试验结果,以及盲沟的可靠性和耐久性等方面对盲沟泄水降压的可行性进行了分析探讨。结果表明:试验模型渗流量的计算结果和试验结果相差不大;当地下构筑物基底位于渗透性较弱的黏土层中,采用盲沟泄水降压技术不仅可有效降低地下构筑物的抗浮水位,且盲沟的渗流量较小,长期泄水对周边环境的影响也较小。因此,当地下构筑物基底位于武汉长江三级阶地的黏土层中,采用盲沟泄水降压技术可有效降低甚至完全消除地下构筑物的抗浮水位,尤其对上部结构自重较轻的地铁地下车站的抗浮有着广阔的应用前景。

Based on geological characteristics of the three-level terraces in the Yangtze River at Wuhan, we analyze the feasibility of depressurization by blind trench drainage. We introduce the practical application of drainage depressurization in engineering projects, present the theoretical analysis and experimental results of blind trench drainage test models, and evaluates the reliability and durability of blind trenches. The findings demonstrate a close agreement between the calculated seepage flow of the test models and the actual experimental results. When the foundation of underground structures is situated in less permeable clay layers,the blind trench drainage technique proves effective in reducing the buoyant water level of these structures. Additionally, blind trenches exhibit minimal seepage flow, resulting in negligible long-term impact on the surrounding environment. Consequently, in areas where the foundations of underground structures lie within the clay layers of the three-level terraces in the Yangtze River at Wuhan, the blind trench drainage technique proves highly efficient in significantly reducing or even completely eliminating the buoyant water level of underground structures. This approach holds substantial potential for application, particularly in the anti-floating of underground stations of subway systems with relatively low self-weight.