The Optimization Analysis Of Pile-Anchor Bracing Based On Numerical Simulation

In recent years, with the development of high-level and high-rise buildings, the pile-anchor supporting structure in foundation pit engineering is becoming more and more extensive. But in the existing specifications, the study of the pile- anchor supporting form just in a pile and a anchor pile anchor separate arranged alternately, this type of pile and anchor pile and anchor combined with rigid connection types mentioned. Therefore, this article based on the actual excavation engineering at Shijiazhuang and the numerical model is established by means of finite difference software. Then we analyze the two kinds of pile-anchor supporting form of horizontal displacement of pile and pile bending moment undering different conditions.With this foundation pit engineering geological conditions, the paper's research content has the following aspects:(1) The horizontal displacement of an pile arc is inside to the foundation pit, and the maximum is in about 0.8 H points for foundation pit excavation depth, rather than the cap.Pile anchor pile and anchor combined support in the form of a separate support in the form of reduced two percent to nine point two percent of the maximum horizontal displacement of pile, reducing five point seven percent to twenty percent of the horizontal displacement of pile head, reduced five point seven percent to ten point nine percent of the most-positive bending moment of pile, reduced five point six percent to twelve point three percent maximum negative bending moment.(2)With the guarantee of pile's enough strength and stiffness, under the proper increase of concrete filling pile embedded in depth can effectively reduce the horizontal displacement of pile and can also be appropriate reduce the pile bending moment. Others, the depth of pile is more obvious at anchor separate than the pile- anchor combined.(3) The diameter of the pile anchor support in the form of change for both horizontal displacement of pile and the pile body bending moment. When the pile diameter as 600 mm and 800 mm, the effects on the pile- anchor separate pile diameter is greater. But when the pile diameter increased to 1000 mm, even with the increase of pile diameter further, two typesof supporting effect on displacement and bending moment are smaller, and haven't changed much.(4) As the change of angle, the pile and anchor pile anchor is greater than the combined separate change degree, and the anchor angle of 25 degrees, and two kinds of pile and anchor pile retaining structure horizontal displacement and bending moment of pile are the smallest,and the dip into 25 degrees to the deformation of foundation pit stability and control ability is strongest.