地下室抗浮设计与事故分析

BASEMENT ANTI-FLOATING DESIGN AND ACCIDENT ANALYSIS

城市用地日趋紧张使得地下空间需求不断加大,单纯地下车库在加大埋深的同时,地下水压随之加大,结构自重往往较轻无法抵抗水浮力,需采用配重法、抗浮锚杆或抗拔桩等方式处理。设计时不仅要按抗浮标准区分不同设计等级,对抗力组合系数分别取值,还应针对不同阶段进行验算,保证从施工到使用阶段都安全。根据项目具体情况采用适合的抗浮措施,但需关注设计及施工环节易忽视的影响因素。通过对某地库抗浮设计实例的分析,对不同抗浮措施进行了对比,得出合理的抗浮方案。对近期发生的地库上浮事故原因进行了分析,并给出处理建议,总结出地库抗浮设计应注意问题。

The increasing tension of urban land makes the demand for underground space continue to increase. When the underground garage increases the buried depth, the groundwater pressure also increases. The structure is often light and cannot resist water buoyancy. Counterweight method and anti-floating anchors are required. rods or uplift piles, etc. When designing, not only should different design grades be distinguished according to the anti-floating standard, and the combined coefficient of resistance should be taken separately, but also should be checked for different stages to ensure safety from construction to use. Appropriate anti-floating measures can be adopted according to the specific conditions of the project, but attention should be paid to the influencing factors that are easily ignored in the design and construction links. Through the analysis of an example of anti-floating design of a basement, different anti-floating measures are compared, and a reasonable anti-floating scheme is obtained. The causes of recent basement floating accidents are analyzed, and suggestions for handling are given, and the problems that should be paid attention to in basement anti-floating design are summarized.