基坑降水对支护结构和地面沉降影响的有限元分析  

The Finite Element Analysis of the Effect of Foundation Pit Dewatering on Supporting Structure and Soil Settlement

作　　者：曹书文[1] 杨璐[2] 孔涛涛[3] 陈平[1] 赵冬[1] 

机构地区：[1]西安建筑科技大学理学院,西安710055 [2]河南工业大学土木建筑学院,郑州450001 [3]北京城建北方建设有限责任公司,北京101301

出　　处：《建筑科学》2011年第9期37-40,共4页Building Science

摘　　要：为了开封玉皇阁保护工程设计研究,对玉皇阁基坑降水进行了有限元分析,考虑了土体降水后固结和支护结构产生变形共同作用下基坑土体的沉降。结果表明,降水瞬时沉降、支护结构位移及土体固结都对地面沉降有影响:降水的影响范围广,土体沉降大且和降水后的地下水位高度有关;支护结构变形的影响区域较小,约在基坑深度范围内;固结沉降较小。采取止水帷幕和坑内降水方法能有效降低坑外的地下水位降深,若同时采取坑外补水方式则更能有效弥补坑外地下水位的降差,对维护坑外周围土体沉降有更好的作用。其结果可为古建筑保护的基坑降水工程提供参考。To provide technique reference for Yu Huang pavilion protection projection, the foundation pit dewatering of Yu Huang pavilion is analyzed by FEM, and the foundation pit settlement under the condition of ground consolidation and supporting structure deformation is studied. The results show that dewatering immediate settlement, supporting structure deformation and soil consolidation have effect on the land settlement; dewatering has the greatest effect on the settlement and it is related to the level height of underground water after dewatering; the affected area of supporting structure deformation is equal to the depth of foundation pit; consolidation has the least effect on settlement. With the method of waterproof curtain and dewatering in foundation pit, the underground water decrease depth outside the foundation pit can be decreased effectively, and it has better effect if the way the water supply from outside the foundation pit is applied at the same time can be adopted the soil settlement around the foundation pit becomes smaller. The results can provide reference to foundation pit dewatering engineering in the conservation of historic buildings.

关 键 词：基坑降水 止水帷幕 固结 沉降 

分 类 号：TU433[建筑科学—岩土工程]