某缓建基坑泄压抗浮技术应用  

APPLICATION OF PRESSURE RELIEF AND ANTI-FLOATING TECHNOLOGY FOR A POSTPONED FOUNDATION PIT

作　　者：王静 WANG Jing(Shanghai Changkai Geotechnical Engineering Co.,Ltd.,Hangzhou 310016,China)

机构地区：[1]上海长凯岩土工程有限公司,杭州310016

出　　处：《低温建筑技术》2021年第2期108-110,共3页Low Temperature Architecture Technology

摘　　要：某基坑上部结构缓建,上部荷载无法满足地下部分抗浮要求,结合基坑施工条件,采用了泄压抗浮技术。对于不同的工况提出了不同的泄压孔施工方式,浅基坑采用底板埋设泄压孔的方式,地铁深基坑采取沿基坑边施工降压深孔的方式,两者施工位置及施工节点不同,浅基坑采取自泄,地铁深基坑需在孔内布设水泵定时抽水。利用VISUAL MODELFLOW模拟了泄压孔泄压效果,并通过基坑底板下布设电子水压计监测结果灵活调整泄压孔。此技术集抗浮原理、泄压孔设计、施工方法于一体,为相关工程提供了参考依据。The upper structure of a certain foundation pit was postponed,and the upper load could not meet the anti-floating requirements of the underground part.Therefore,the pressure relief anti-floating technology was adopted,combining with the construction conditions of the foundation pit.Moreover,different pressure relief hole construction methods are proposed for different working conditions,in which the shallow foundation pit adopts the method of burying the pressure relief hole on the bottom plate,and the subway deep foundation pit adopts the method of constructing the pressure-reducing deep hole along the side of the foundation pit.In addition,the construction location and construction of both nodes are different where the shallow foundation pit adopts self-draining,and the deep foundation pit of the subway needs to arrange a water pump in the hole to pump water regularly.Furthermore,the VISUAL MODELFLOW software was used to simulate the pressure relief effect of the pressure relief hole,and the pressure relief hole was flexibly adjusted through the monitoring results of an electronic water pressure gauge arranged under the bottom of the foundation pit.The presented technology integrates anti-floating principle,pressure relief hole design,and construction method,which may provide the reference for related projects.

关 键 词：缓建基坑 泄压抗浮 泄压模拟 

分 类 号：TU473[建筑科学—结构工程]