地下水位抬升对非湿陷地基变形的影响  

Effect of the Groundwater Table Rise on Non-collapsible Foundation Deformation

作　　者：刘振红[1] 张一[1] 

机构地区：[1]黄河勘测规划设计有限公司,河南郑州450003

出　　处：《华北水利水电大学学报（自然科学版）》2015年第5期52-55,共4页Journal of North China University of Water Resources and Electric Power：Natural Science Edition

摘　　要：地下水位抬升后不仅影响地基土层有效应力的分布,除典型的湿陷变形外,非湿陷土因压缩性增大同样可在原有沉降变形的基础上产生附加变形.以某水库环境地质影响专题研究成果为基础,对比天然状态下与饱和状态下的不同土层固结试验成果,研究了地下水位抬升对地基变形参数的影响程度.以常见的建筑物荷载与基础类型为例,分别计算了粉细砂、粉土、粉质黏土地基的墙下条形基础和筏板基础在地下水位抬升后可能产生的附加变形量.计算结果表明:地下水位抬升对粉质黏土地基影响最大,其筏板基础的附加变形量可达46.53 mm,对建筑物安全将产生一定的影响,结果可为建筑物浸没判别标准提供依据.The groundwater table rise not only affects the effective stress distribution of foundation soil,excluding the typical collapsible deformation,the non-collapsible soil can also generate additional deformation on the basis of original settlement due to the increasing compressibility. Based on the study about geological environment impact of a reservoir,by comparing with different soil consolidation test results under the natural state and saturation state,the effect of ground water table rise on foundation deformation parameters was studied. Taking an example of the common building load and foundation type,after the water table rising,the additional amount of deformation of sand,silt and silt clay were respectively calculated in case of strip foundation and raft one. The results show that the groundwater table rise has the largest effect on silty clay foundation. The additional deformation of its raft foundation is up to46. 53 mm,this will have some impact on the building security. The results can provide the basis for building immersion criterion.

关 键 词：地下水位抬升 非湿陷土 附加变形 地面沉降变形 压缩模量 

分 类 号：P642.5[天文地球—工程地质学]