Research On Design Calculations Of Sunken Anti-slide Pile

There are a large number of mountains in our country, whose geological structure arevery complex, and are easily to induce landslides and other geological disasters. With thevigorous development of infrastructure construction, many major projects beneficial to thepeople’s livelihood have been started, which have exacerbated the vulnerability of thegeological environment. In the course of project implementation, it is potentially threatenedand seriously harmed by the landslide hazard.Landslide is one of the most widely distributed geological disasters in all slope failures,whose harm is the most serious, and our country is one of the countries that suffers mostsevere losses affected by the landslide disaster in the world. In order to effectively protectpeople’s lives and property, the relevant departments have attached great importance to thelandslide and taken active control measures. Incomplete statistics show that there are4429geological disaster points in the Three Gorges Reservoir, of which, there are2490large-scalelandslides. Since2002, two special geological disaster control projects have been investedmore than120billion yuan. It is seriously needed to systematically research on the landslidecontrol methods and provide scientific basis for engineering practice.As one of the primary means of landslide remediation, anti-slide pile has been widelyused in landslide control project. However, because the large difference between the existingtheoretical research and engineering practice of anti-slide pile, especially the designparameters of anti-slide pile is determined very arbitrarily, which is lack of a reasonablestandard and scientific theory, its design scheme is difficult to achieve the dual purpose ofsafety and economy. The overly conservative design will cause a great waste of investment,while the contrary will cause engineering problems, leading to greater economic losses. Toin-depth study on the interaction mechanism of anti-slide pile and landslide is one of the mostimportant applied issues that need to be solved urgently.To control landslide, anti-slide pile is the commonly used anti-slide structure. Recentyears, in some large and complex landslide control engineering, in order to reduce the pilelength and project cost, the anti-slide pile has appeared, whose top is deep in the ground. Andwe call it embedded anti-slide pile here.The most obvious advantage of embedded anti-slide pile is that the bending moment itpile suffered is little, the internal force of pile distribute reasonably, and the masonry is less,reducing the cost of anti-slide project. However, what are the differences of the applicableconditions and the mechanical characteristics between the embedded anti-slide pile and thepiles whose top are on the ground? The researches have been carried on are not completely clear, which has greatly restricted the promoting of embedded anti-slide pile. The workmechanism and design calculation methods were researched in this paper:(1) Summarized the existing design calculation methods of embedded anti-slide pile, andpointed out some problems of the existing calculation methods.(2) Researched on the design calculation methods of embedded anti-slide pile bytheoretical analysis and finite element strength reduction method. Proposed the designmethods and ideas of embedded anti-slide pile, and summarized the basic definition ofembedded anti-slide pile developed the internal force distribution and force mode ofembedded anti-slide pile through engineering example, and obtained the more realistic designcalculation method of embedded anti-slide.(3) Analyzed and calculated the pile length control conditions of embedded anti-slidepile cantilever. Obtained the thrust distribution form of the front and backend of embeddedanti-slide pile.(4) Discussed some design issues of embedded anti-slide pile: the location of emplacedanti-slide pile, pile spacing, shape and size of the pile cross-section, and their effect onreinforcing the landslide, got some more practical results.(5) Simulated and analyzed the applicable conditions of embedded anti-slide pile throughfinite element strength reduction method. Studied the soil strength of sliding body, shape ofslippery surface, thickness of sliding body where set pile, slope shape of sliding body in frontof the pile, and their effect on reinforcing the landslide, got some more practical results.(6) Analyzed the engineering examples by finite element software, extracted thedeformation data of the monitored landslide, and by compared with the measured data,verified the rationality of using embedded anti-slide pile in taping landslide control, toprovide the basis for the subsequent design calculations of embedded anti-slide pile.