Testing Study On Landslide Reinforced With Grouting And Steel Micropiles Composite Structrue

Landslide is one of the most popular and harmful style of geological disasters. Grouting and Steel micro-piles composite structure is a new type of landslide retaining measure, which systematically combine with the grouting technology and the anti-slide pile. The computational theory of grouting and steel micro-piles composite structure on slope engineering or retaining landslide is lagging for behind its practical application, although deeply understanded and be applied to a wide range of areas. Now we often use the theory and calculation parameters of stabilizing pile. It is an urgent task to research the anti-sliding mechanism of micro-pile composite strueture.In this paper, on the basis of grouting and steel micro-piles structure's reinforcing mechanism, the calculating methods of stabilizing pile and retaining wall were comparative analyzed. Two kinds of conditions were proposed in the reinforcement landslide centrifuge model test, one of which was grouting and steel micro-piles structure reinforcement landslide model test and the other of which was no reinforcement landslide model test. The controlling effect and force characteristics of steel micro-piles reinforcing landslide were analyzed.The main results and conclusions are gained though centrifuge model test.The soil pressure on the pile gradually increase along with pile depth,and posterior pile bear the larger landslide thrust force. The shear capacity of posterior pile and stess transferring between piles should be considered. The bending moment curve of the pile is S-shaped. The type of sand slope in the test is more likely to occur shallow traction sliding.In order to get a better effect,the rockbolt or anchor cable should be used with the grouting and steel micro-piles structure on the landslide.