Study On The Quality Control Of Highway Foundation Construction In Collapsible Loess Area

Collapsible loess in China is widely distributed,but the engineering properties is poor,strength greatly reduced by water,there are significant subsidence,The construction of soil moisture in the construction of the project will have a great harm,seriously affect its safety and use.In view of the characteristics of collapsible loess,In order to meet the engineering requirements,the collapsible loess must be treated to guarantee the construction quality of the project.For the control of treatment measures to collapsible loess,will have an impact on the entire project.If not handled properly,will cause the uneven settlement of foundation,pavement damage,etc.So,in the process of wet sinking loess,we shouldwidely use all kinds of conditions of processing methods,and pay attention to environmental protection.How to build the highway in the Loess area;ensure the foundation is safe and economical,the reasonable foundation treatment construction technology and construction quality control technology in the process of construction quality control technology becomes the key,so that have great research value.On the basis of the introduction of the nature and the mechanism of collapsible loess,put forward the treatment method of collapsible loess foundation subsidence problem,such as: replacement cushion method,dynamic compaction method,lime soil compaction pile,Vibroflotation method etc.Through the introduction of a variety of wet sinking loess foundation treatment method,construction technology,use range.The lime soil compaction method is more economical for it realizes the goal which exert in various soil foundation treatment method,so it have been widely used.Next,this paper focuses on the construction quality control of lime soil compaction pile ? The control method includes the construction quality of lime soil compaction pile from the whole research perspective,Including PDCA cycle method;Research on the construction quality control of the whole construction process from the microscopic point of view;then making the evaluation to the lime soil compaction pile foundation treatment effect from two aspects of content detection and inspection contents,important control parameters during construction:The compaction degree of the piles;the soil compaction degree;the coefficient of the soil between the piles;the bearing capacity of the composite foundation.To ensure that all the parameters,construction quality,strengthening effect,composite foundation to achieve reach the standard of elimination the wet sinking.Finally,taking "the A7 contract section of the eastern section" as a case,and analysis in detail.