预浸水法处理湿陷性黄土地基的试验与应用研究  

Experiment and Application of Prewetting Method Treating on Collapsible Loess Foundation

作　　者：李辉山[1] 腾文川[2] 赵卿[2] 李萍[1] 

机构地区：[1]兰州理工大学土木工程学院,兰州730050 [2]甘肃土木工程科学研究院,兰州730000

出　　处：《建筑科学》2011年第5期36-40,共5页Building Science

基　　金：甘肃省自然科学基金(0803RJZA011和0916RJZA024)

摘　　要：预浸水法是消除黄土地基湿陷性的一种处理方法,具有施工条件简单,处理效果好的优点。采用浸水法对兰州连城铝厂306厂阳极糊车间的自重湿陷性地基进行处理,由现场与室内试验分析地基土浸水前、后干密度、湿陷变形特性以及地基承载能力的变化及土垫层法和外扩桩法的处理效果。分析结果表明:浸水可以基本消除10 m范围内黄土的湿陷性,但短期承载能力会下降;采用垫层法处理有利于附加应力的扩散;承台对浸水地基承载力的影响可以忽略不计。Prewetting method needs a simply constructing condition and plays a very efficient treating role,which has been applied in eliminating collapsiblee destroy on loess foundation.Based on the treated collapsible foundation of Anode Paste Workshop of 306 Factory at the Liancheng Aluminum Factory in Lanzhou by the prewetting method,the dry density,characteristics of collapsible deformation,and bearing capacity of the foundation before and after inundation as well as treating effect of the cushion method with soil and the pile with expanding head were analyzed by field and laboratory tests.The results indicate that the collapsing characteristic of loess in the range of 10 m in depth after inundation would be eliminated.However,the short-term bearing capacity for the loess foundation was obviously decreasing.Superimposed stress under the foundation would be dispersed more quickly after treated by the cushion method.The action of bearing platform for water-immersed foundation should not be taken into consideration.

关 键 词：预浸水法 湿陷性黄土地基 湿陷量 垫层法 外扩桩 

分 类 号：P642.13[天文地球—工程地质学] TU444[天文地球—地质矿产勘探]