Study On Working Mechanism Of Surround-Pile-Soil Coupling Anti-Slide Structure

Traditional anti-slide pile has been widely applied to landslide treatment engineering, butdue to the lack of taking full advantage of soil strength and its design was too conservative,this paper will discuss a new surround-pile-soil coupling-anti-slide structure that can makebest use of soil strength. Therefore, it is imporant to study on sliding mechanism of couplingstructure.Firstly, starting from structure plane layout, the reasonable surround pile combination isobtained through analyzing all kinds of combination form and surround pile spacing isdetermined through combining soil arch theory and flow resistance method, meanwhile, basedon existence of the small soil arch among adjacent surround piles, the coupling effect ofstructure is evaluated by Introducing coupling structure influencing diameter concept.Secondly, in view of the above reasonable structural form, indoor model test is builded byburying coupling structure in cohesive soil landslide, then according to stress、strain、displacement and other testing method, the force distribution rule of soil inside and outsidecoupling structure, the earth pressure distribution before and after surround pile, the earthpressure distribution along the direction of the sliding surface In Landslide soil, bendingmoment distribution of surround piles and horizontal displacement variation pattern ofcoupling structure are obtained. the coupling effect of structure is further verified and slidingwork mechanism is revealed on model test. Thirdly, according to the test results, designtheory of coupling structure is discussed by introducing influence diameter as couplingstructure calculation width and coupling body as a whole for the stress calculation, then themaximum stress calculation expression of structure is obtained In different boundaryconditions, meanwhile, stress distribution mode of coupling structure between surround pilesand soil is given that calculate stress of each surround piles, and complete reinforcementdesign on each surround pile by applying present structure design theory. Finally, abovetheory is applied to engineering example that lay the foundation for pile-soil couplingstructure further studying.