Study On Tests Of Sunken Piles And Their Mechanism

Sunken anti-slide pile as a economical and practical support structure used for preventing sloping have drawn attention by many geotechnical engineers and researchers in recent years, which is often adopted in engineering. Because its theoretical studies, including working principle and broken mechanism and so on ,are not comprehensive and systematical in engineering preventing sloping, application of sunken anti-slide pile is limited very much. In the past years, engineering technician mainly depended on personal previous experience and copying other support structure form of design and construction means when they dealed with sliding problems,. Which sometimes brings non-purpose and non-sciences for design and construction , leading to vast waste and potential dangers.Chongqing region including san-xia water-belt is list one of main regions of our country's prevention and cure of coast dangerous rock and geological calamity, which geological calamity is quite bad because of special nature's surroundings. Recently, sunken anti-slide pile as a economical and practical anti-slide and support structure is often used in Chongqing region and it will bring prominent economical profits to Chongqing region including san-xia water-belt. Chongqing national land resource and housing office, Chongqing city geological surroundings full-station and <> editor group set up item for sunken anti-slide pile and commission us to go on studying for that problem, This projection technically go on studying for working mechanism of sunken anti-slide piles:Firstly, results of theory: Calculating models and broken and controlled condition of sunken anti-slide pile are put forward, problem of bearing capacity is compared between sunken anti-slide pile and cantilever anti-slide pile by a example in engineering. The results indicate that sunken anti-slide pile used in engineering can greatly improve capability of bearing capacity of pile .Secondly, model test indoors and results of theory: According to some experimental phenomena existed in model test indoor, the paper analyze detailedly each factor such as space between two piles, anchor-deepness, resistance distribution graph, cantilever-height above sliding surface etc which influence bearing capacity and deformed shape of sunken anti-slide pile and particularly research profoundly rising arch phenomena in the way of model test indoors. These analysis help us to know more about working mechanism of sunken anti-slide piles. At the same time the thesis put up contrast and analysis to the formula according to model test' results indoors. Analysis make it clear that sunken anti-slide piles can give birth to new sliding route when sliding and point out pile's cantilever-length above sliding surface is limitedly minimized at the same time, while designing sunken anti-slide pile's bearing capacity calculating models.Thirdly, experiment of level thrust and results of numerical calculation: In antilever anti-slide pile's experiment of level thrust, the paper introduce the method of level thrust test of cantilever anti-slide piles and correlative parameter's measurement besides studying resistance rock and soil's stress-train distribution law when anti-slide pile bearing level load and pile body's movement and broken mechanism. The thesis make numerical calculation of anti-slide pile using large-scale powerful finite unit analysis program "Ansys". The analysis result of model test indoors, experiment of level thrust and three-dimension numerical calculation compared, disclosing different working mechanism between sunken anti-slide pile and anti-slide cantilever pile.Fourthly, study results of pile breast wall design: the paper go on elementary study to breast wall soil tress calculation when constructing sunken anti-slide piles by the way of digging hole in the end , especially putting forward a new calculating method to rectangular hole's soil stress calculation while protecting holes and compar...