摘要
随着地下空间需求与日俱增,越来越大的地下结构体量给地下结构的抗浮设计带来严重的挑战。常规的以"抗"为主的采用抗拔桩(锚杆)抗浮方法往往导致经济和时间成本的大幅增加。结合实际工程,介绍一种以"截排"为主的地下室抗浮方法。方法的核心在于2点:一是"截",通过地下室周边的止水帷幕进行截水,减少基坑的涌水量,从根本上减少排水对周边的环境的影响;二是"排",通过在地下结构底板下设置敞口式大直径无砂混凝土减压井排水,降低水头,减小作用在结构底板上水荷载。截排联合,可控制排水带来的环境影响,增加排水减压系统的可靠性和耐久性。敞口式大直径无砂混凝土减压井组成的减压系统不易淤堵、可维修,保证减压系统长期有效运行。敞口开放式的设计也使得减压系统具有应急功能,确保地下室安全。最后指出,地层中存在一定厚度的强透水对截排减压抗浮是有利条件,在此种地层条件下,截排减压对环境的影响很小,可优先考虑使用其进行抗浮。
A sharp increase in the size of underground structures brings a great challenge to the anti-floatation design. A conventional passive method usually means a huge cost in finance and time. An efficient active method was thus proposed. The essential idea of the method is to reduce the water pressure by drainage and to control its environmental impact by cut-off walls（curtains）. The application of the method in a practical case was addressed in details with the emphasis on how to make the drainage system reliable and maintainable. The drainage system has been on service over seven years successfully. It was found that a large diameter relief well made of pervious concrete was not clogged and easy maintainable. A stratum with a strong permeable soil layer is a favorable condition for the proposed method because the environmental impact can be controlled easily. In this case, the method should be first choosed.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2016年第12期2542-2548,共7页
Chinese Journal of Rock Mechanics and Engineering
基金
"十二五"国家科技支撑计划项目(2011BAG07B02)
中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室资助项目(Z015013)
中央高校基本科研业务费(20152M024)~~
关键词
地下工程
地下结构
抗浮
排水减压
渗流
减压井
underground engineering
underground structure
anti-floatation
drainage
seepage
relief well
