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随着地下结构的变大变深,常规的抗浮方法往往导致经济和时间成本大增。结合实际工程,介绍一种以“排”为主的利用排水廊道进行坡地地下结构抗浮的方法。方法核心是通过在地下结构周边设置排水廊道降低设计水位,减小作用在结构底板上的水荷载,难点在于保证排水廊道长期运行可靠性和控制降水对周边环境的影响。详细介绍排水廊道减压系统的特点,设计应着重注意的问题、分析方法以及计算结果与实测结果的比较。该方法不但具有一般排水减压法经济效益显著,不影响工期的特点外,同时还具有以下3个特点:一是能充分利用坡地地形的特点实现廊道内的渗水自排,减少运行成本;二是廊道可进人,易于维修,其长期运行的可靠性易于保证;三是排水设施与主体结构相互独立,对主体结构的干扰小。
As subsurface structures become larger and larger, conventional anti-flotation methods often result in significant increases in economic and time costs. Combined with the actual project, this paper introduces a method of using drainage corridor to resist floating in subsurface structure of slopes based on “row ”. The core of the method is to reduce the design water level and reduce the water load acting on the structural floor by arranging the drainage corridor around the underground structure. The difficulty lies in ensuring the long-term operation reliability of the drainage corridor and controlling the impact of precipitation on the surrounding environment. Described in detail the characteristics of drainage corridor decompression system, the design should pay attention to the problem, the analysis method and the calculated results and the measured results. The method not only has the obvious economic benefits of general drainage and decompression method, but also does not affect the characteristics of construction period, but also has the following three characteristics: First, it can make full use of the characteristics of slope topography to realize water seepage in the corridors and reduce running costs; Corridor can be entered, easy to maintain, easy to ensure the reliability of its long-term operation; Third, the drainage facilities and the main structure independent of each other, the main structure of small interference.