Collapsible Loess Area Building Forced Landing Correction Theory And Practice

Collapsible loess areas are widely distributed in Northwest China, where a lot of shallow foundations of buildings were constructed. As time went by, uneven settlement occurred to some of these buildings because of the pipe leakage or rainwater soakage. To ensure safely usage of these buildings rectification must be taken .In allusion to the forced settlement on collapsible loess, by many rectifying methods some anticipative purpose can be obtained in some situations only for project applications, but this method is based on knowledge of experience, there is lack of corresponsive theoretical guidance, the qualitative analysis is considered as the only basis of technical treatment, therefore it lacks of technical process of the quantitative calculation and has some indecisive property. Approved by some engineering practices, conventional rectified and reinforced technology will unavoidably bring into some phenomena of taking time and a lot of trouble, and indeed just the opposite to what one wishes, will come forth fatal consequence that the rectified and reinforced objects must be dismantled. In this paper, model experiment research was carried, of which was based upon the forced settlement and rectification measure of some buildings on self-weight collapse loess area. At the same time, some conclusions are drawn: 1) the relationship between the soil stress deliquesce and quantity of slope, quantity of settlement of buildings and stress variety of soil body; 2) the relationship between the superimposed stress and quantity of slope, quantity of settlement of buildings and stress variety of soil body; 3) the relationship between quantity of slope, quantity of settlement of buildings and water injection quantity in hole; 4) the relationship between quantity of slope, quantity of settlement of buildings and diameter and interval of hole; 5) the relationship between stress variety of soil body and water injection quantity in hole and interval of hole. Through the experimental study for rectification model on collapsible loess ground, some theoretic problems of rectification of buildings are basically resolved for collapsible loess ground.