The Experiment Research On The Effect Of The Temperature And Soil Properties On The Strength Of The WJP

For its advantages in construction, technology and economy, WJP has been widely used in groundwork improvement of soft ground foundation in highway construction these years. It plays an important role especially in transition section or in the sections of the highway on bad geologic conditions or in the sections which include structures inside. However, for the insufficiency of the knowledge of how the factors and surroundings affect the quality of WJP (such as the ground temperature and soil properties),on the work field, the construction of filling soil is usually carried out before the WJP achieves its qualified strength, and this leads to series of accidents, such as the settlement of embankment ,dehiscence of pavement, which is lead by lack of the bearing capacity. It is necessary to study it in a deep-going and systematic way to make the WJP-which is simple to construct, economical and practical, play a more import role in the groundwork improvement of soft soil groundwork, and avoid unnecessary lose. This paper combines the project of LIAN-YAN highway, discusses the effect of the curing temperature and the properties of soil on the strength of the WJP material, and study the effect of the curing temperature and the properties of soil on bearing capacity of WJP in the model experiment together, so it is possible to take the factors which affect the quality of the WJP into account, and improve the theory of composite foundation, control the construct in field and get good social benefit and economic benefit. The work in this paper contains several parts:1) Make cement-stabilized soil using two kinds of soil from the work field of Lian-Yan highway, cure them under different temperatures for different ages, then carry out unconfined compression test, and estimate the effect of the temperatures, ages and the kinds of soil on the strength such as unconfined compression strength and modulus of deformation.2) Research the relationship between microscopic structure and macroscopic physical and mechanical properties, study the effect of the temperatures and theproperties of soil on the strength of the cement-stabilized soil.3) To study the effect of the maintaining temperature and the properties of soil on the bearing capacity of WJP in the model experiment, this part contains mainly experiment on the bearing capacity of the WJP in different seasons, then compare' them, and consider the effect of the curing temperature, the soil properties on the bearing capacity of WJP, and evaluate the effect. Take the average temperature in the curing time as curing temperature.4) Drive WJP in the model box specially used for testing the strength of material, use the material parameters in the numerical simulation of WJP, then we can know the effect of ground temperature and soil properties on the bearing capacity of WJP, and measure the level of them, and get the numerical varying law of the deformation ofWJP in the model under different condition.