盲沟泄水降压技术在地下构筑物抗浮中的应用探讨  

Application of Depressurization Technology by Blind Trench Drainage in Anti-floating of Underground Structures

作　　者：陶文涛 湛海群 孙毅 谢俊[3] 罗会平[3] 董俊[3] 安旭文[4] TAO Wen-tao;ZHAN Hai-qun;SUN Yi;XIE Jun;LUO Hui-ping;DONG Jun;AN Xu-wen(Wuhan Metro Group Co.,Ltd.,Wuhan 430077,China;Hunan Engineering Consulting Company,Changsha 410000,China;China Railway Fourth Survey and Design Institute Group Co.,Ltd.,Wuhan 430063,China;School of Civil Engineering,Wuhan University,Wuhan 430072,China)

机构地区：[1]武汉地铁集团有限公司,武汉430077 [2]湖南省工程建设监理有限公司,长沙410000 [3]中铁第四勘察设计院集团有限公司,武汉430063 [4]武汉大学土木建筑工程学院,武汉430072

出　　处：《长江科学院院报》2023年第6期133-138,共6页Journal of Changjiang River Scientific Research Institute

摘　　要：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.

关 键 词：抗浮稳定设计 盲沟 泄水降压 可行性分析 长江三级阶地 

分 类 号：TU943[建筑科学—建筑技术科学]