Engineering Geological Condition And Foundation Treatment Of Reservoir In Collapsible Loess Area

Huining, located in northern of gansu province, is very dry because of little rain. The northern Huining water supply project of the first-phase engineering of Gansu Yintao Water Supply Project aims to solve drinking water problem and part of the agricultural irrigation water. The project adopts the water pipeline to drawing water, and setting reservoir in various natural villages to facilitate the masses of the people getting water. Because of Huining located in the collapsible loess region, reservoir site is Ⅲ-Ⅳ levels of gravity collapsibility, and the collapsibile loess is deep. It is most important of its foundation treatment for ensuring the safe and stable operation of the reservoir and the most economic and reasonable design and construction scheme. Collapsible loess is widely distributed in China northwest region, and engineering experience of loess foundation treatment is very rich because of the practice for decades. The paper studied the region of the engineering geological properties of collapsible loess, and suggested the foundation treatment of collapsible loess area. The results showed that the seepage control is main measures for the low requirements of the bearing capacity of foundation, that is, collapsible loess foundation bearing capacity met the design requirements. Huining northern reservoir water supply project is not high requirements for he foundation bearing capacity, so it can give priority to with seepage control for foundation treatment design. The well i water-resisting layer and tamping cab prevent the flooding of collapsible loess ground in order to achieve the purpose of avoiding foundation collapsibility.