真空-堆载联合预压的地基沉降简化计算方法  

Simplified method of ground settlement under vacuum combined surcharge preloading

作　　者：刘汉龙[1] 彭吉力[1] 陈永辉[1] 

机构地区：[1]河海大学岩土工程研究所,南京210098

出　　处：《岩土力学》2006年第5期745-748,共4页Rock and Soil Mechanics

基　　金：国家自然科学基金资助项目(No.50379010)

摘　　要：研究了负压作用下的地基沉降简化计算方法,负压作用下的地基沉降计算应考虑其受力特点的影响,实际工程观测表明,现有规范对真空预压地基的沉降估算修正系数过大。通过理论推导,建立了真空预压及真空-堆载联合预压作用下地基沉降修正系数公式。分析结果表明,一般真空预压工程修正系数ms取值范围可在0.55～1.20之间,真空-堆载联合预压的分层总和法计算修正系数可取0.70～1.30。Simplified method of ground settlement under negative pressure is studied, which the deformation mechanism under vacuum preloading is considered. Observation of settlement for vacuum preloading engineering shows that the practical settlement is smaller than the predicted one based on the National Code of China. The settlement correction factors for vacuum preloading and vacuum combined surcharging preloading are established based on theoretical derivation. It is concluded that the scope of ground settlement correction factor ms may be 0.55 to 1.20 for vacuum preload engineering; and 0.70 to 1.30 for vacuum combined surcharge vreloading with laver wise summation method.

关 键 词：真空预压法 真空-堆载联合预压法 分层总和法 沉降修正系数 

分 类 号：TU441[建筑科学—岩土工程]