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Collapsible loess is a non-saturated undervoltage dense soil, with large holes and vertical joints in natural humidity, lower compression, higher strength, but the water soaked soil strength significantly reduce additional pressure or collapse deformation caused by the additional pressure and the pressure of the soil weight, a sink large, sinking fast instability deformation big harm of buildings.

Collapsible loess in China are mainly distributed in some regions of Shanxi, Shaanxi, Gansu, most parts of western Henan and Ningxia, Qinghai, Hebei, In addition, Xinjiang, Inner Mongolia, Shandong, Liaoning, Heilongjiang and other local areas distributed Collapsible loess. Above regions (northeast, north, northwest) of the rich in wind energy resources, mainly wind farm areas, especially the three northeastern provinces, Hebei, Inner Mongolia, Gansu, Ningxia and Xinjiang provinces (autonomous regions) in China are nearly 200-kilometer-wide zone wind power in the northern region rich with wind power density of more than 200 ~ 300W/m2, some reach more than 500W/m2.

In recent years, rapid economic growth, the increase in demand for electricity and the promotion of energy saving and emission reduction, China's wind power projects

Mesh construction has achieved explosive growth, an increasing number of the collapsible loess venues construction projects, increasing scale, how to design wind turbine foundation for safe and economic operation of the wind farm has a very important practical significance. Ground treatment measures, the depth and the remaining wet ground treatment depression should reach "the collapsible loess areas provisions of the building codes. This wet the collapsible loess soil thickness in the venue less than 15 m to meet regulatory requirements; venue for more than 15 m, the existing approach, due to the limitations of mechanical equipment condition, it is difficult to reach the depth of treatment requirements, not the processing residual soil collapsible can not control within the specification range. This not only increases the difficulty of construction, can not reflect the shallow basis of technical and economic rationality. In order to improve the bearing capacity, reducing the number of piles, length shortened pile, the pile tip enlarged bottom the foundation platform diameter can be reduced, which saves engineering, also shorten the duration and reduce the cost.