双层地基排水减压和基坑降水设计  

Drainage and dewatering design of double layered foundation

作　　者：杜林[1] 

机构地区：[1]安徽省水利水电勘测设计院,合肥230000

出　　处：《水科学与工程技术》2017年第4期56-59,共4页Water Sciences and Engineering Technology

摘　　要：双层地基常由于弱透水层的阻水作用,使得下卧强透水层水压较大,以致地基发生渗透变形破坏,故双层地基上修建泵站应特别重视排水减压设计。同时基坑开挖减小了弱透水层厚度,坑底易发生流土等渗透破坏。结合龙滩庵泵站工程设计实例,以双层地基减压井渗流计算为依据,论述了双层地基修建泵站时的排水减压和基坑降水设计,工程施工和实际运用均得到了进一步验证。The double layer foundation due to water resist ance effect of aquitard, the pressure of underlying strong permeable layer is larger, the foundation has been damaged by seepage deformation, so the construction of pumping station on the double layer foundation should pay special attention to drainage design. The excavation of foundation pit will reduce the aquitard thickness, the pit bottom is easy to soil flow. This paper takes Longtan-an station engineering design as the example, based on the seepage calculation of relief wells on the double layer foundation, the drainage and dewatering design of pumping station construction on the double layer foundation is discussed. The construction and application have received good results, the design has been further verification.

关 键 词：双层地基 泵站 降水 减压井 渗流稳定 

分 类 号：TV223.5[水利工程—水工结构工程]