Research On The Treatment Of Collapsible Loess Foundation

Collapsible loess is unsaturated and underconsolidated. At its natural water content, its compressibility is rather low and its strength is somewhat high. However, upon wetting, its strength will decrease significantly, and then it will collapse either under its own weight with no surcharge or under surcharge load and cause damage to buildings and structures. Therefore, it is very important to take appropriate counter-measures to reduce or eliminate the settlement caused by the subsidence and guarantee safety and use of building.Combined with the experiment on the loess foundation treatments of the power plant in Datang, Shanxi, experimentation research of pile foundation and lime-soil compaction pile in the foundation treatment are mainly carried out in this paper. By contrasting the result of static load test method with that of the self-balance pile testing method, the paper proved the applicability of the latter in the collapsible loess region. Through analyzing the result obtained from tests in the collapsing loess ground, this paper deals with the development of negative friction of pile in loess, and makes a research of load transfer behaviors of pile.In addition, based on the application of lime-soil pile composite foundation in the loess region, the engineering properties of lime-loess, the bearing mechanism of lime-soil pile composite foundation and the collapsibility after the foundation treatment are explored. It is concluded that the method of lime-soil compaction pile to treat collapsible loess can improve the engineering properties of soils, eliminate collapsibility and enhance the bearing capacity of foundation, which can be changed with the space between piles.