| Anti-slide pile as an engineering building has been widely used in order to prevent and control landslide and slope in many countries. Because that the interaction mechanism and load transfer rule between anti-slide pile and wall protection in engineering slippery body are not very clear, there is no corresponding analysis theory and design method. In domestic design more reference specification related to in the pile foundation engineering manual vertical pile by pile load, horizontal load pile and the passive piles. Design theory and calculation method of anti-slide pile reinforcement slope still lag behind the engineering practice, especially in the engineering design without considering the influence of the existence of wall protection structure. For anti-slide pile wall protection-slippery slope reinforced body becomes the researches on the mechanism of the interaction and contacts in the anti-slide pile engineering in urgent need of research topic.The paper introduced the basic element of anti-slide pile and wall protection structure, analyzed the construction process and design theory of anti-slide pile and wall protection structure. Combined with anti-slide pile stress state and the majiagou landslide geotechnical test data, establishing the anti-slide pile, wall structure and interaction of the numerical model. The presence of piles against sliding mechanism with the wall protection structure, wall protection structure effecting the pile-wall protection-landslide body, and influencing factor of pile-soil arching effect were studied. The main research results are as follows:(1)summarize the basic elements and the design and calculation theory of anti-slide piles, the stress of anti-slide pile are analyzed, the basic principle and construction process of artificial dig-hole pile, and introduces the protective sleeve structure basic elements and anti-slide pile soil arch concept and research status, with or without wall protection structure of the numerical model is established.(2)Summarize coordinate deformation rule and the characteristics of soil stress and displacement of anti-slide pile and the sliding mass for different distance on both sides of landslide body. Research results show that:①With the sliding ratio of sliding mass increases, the anti-slide pile anti-sliding effect of the play is a gradual process;②Within the landslide body sliding process, the material strength pile overcome itself produce horizontal displacement and flexural deformation;③Within the landslide body sliding process, the sliding face soil mass stress state in the bed of the sliding body is abate, the influence of pile and the soil near the pile deflection deformation coordinated, and affected by pile flexural deformation.(3)Summarize coordinate deformation rule and the characteristics of soil stress and displacement of anti-slide pile-wall protection-the sliding mass for different distance on both sides of landslide body. Research results show that:①In sliding of the landslide mass, breast wall structure with pile coordinate deformation, shares in force of the landslide mass and passes it to the built-in end sliding bed soil, using the stable soil anchoring function of balancing the decline of the force;②Wall protection structure internal force distribution and pile body force distribution law is consistent, with the increase of the sliding body slip including to give full play to the piles against sliding wall protection structure was also a gradual process;③With the increase of sliding body slippage, the bending moment distribution of pile with wall protection is different with the pile with no wall protection. The bending moment of wall protection structure and anti-slide pile with wall protection showed a trend of decrease after the first increase, and the bending moment in the same direction;④The wall protection structure change internal force distribution of anti-slide pile, compared to the pile without the wall protection structure, the maximum pile bending moment, and maximum pile shear wall structure are both reduced, and with the displacement of pile wall protection structure as a whole is less than the no pile wall protection structure, reduce the engineering requirements for pile strength.(4)Determine the strength range of anti-slide pile, build the numerical calculation model of differing the strength of anti-slide pile and wall protection structure. Parameters and the outer wall of wall protection structure form and the pile wall protection outer wall and pile soil contact parts, has carried on the generalized, established considering pile wall protection peripheral role of piles and soil in the form of numerical model. Numerical calculation software for the above problem has carried on the numerical simulation research, mainly from the pile, wall protection structure internal force and deformation analysis of pile, pile wall protection strength changes breast wall and the influence of the interaction, from a pile after pile of soil displacement and stress analysis of the outer wall form the impact on the role of piles and soil. Research results show that:①Under the condition of wall protection intensity constant, along with the increase of strength of pile body, pile and wall protection’s shear force and bending moment are decreased, pile wall protection structure deformation with along with the increase of pile strength by elastic body deformation features turn to the rigid body transformation;②With pile strength is constant, along with the increase of strength and protecting, the pile and its own building, bending moment and protecting both decreases, and deformation of pile and wall protection with the increase of strength and protecting also appear by elastic body deformation features turn to the rigid body transformation trend;③Soil arching effect and the stress and deformation of soil around the anti-slide pile have much to do with the outer shape of wall protection;④Through the different outer shapes of wall protection under the action of piles and soil of numerical test and research, been concluded between the pile pile arch for the various stages of the soil arch effect, have the effect of anti-sliding, together between pile should be considered in practical engineering are been arch of common utility.(5)Simulated the real stress state of the soil and anti-slide piles interaction, using finite difference program FALC3D to establish the numerical test model of arch effect. Three aspects are researched about soil arching effect sensitive parameters, principal stress of soil of the landslide mass, horizontal displacement and soil stress distribution characteristics of landslide body soil between the center line. Research results show that:①Respectively, the mechanism of the soil arch effect of anti-slide pile, the development change rule and the change of depth three questions has carried on the related research, mainly by analyzing the principal stress of soil of the landslide mass, center line horizontal displacement between pile and soil stress distribution characteristics of soil change law of four aspects, summarizes the development characteristics of pile and the soil arching effect;②Concluded that elastic modulus of the sliding bed soil enhance the soil arch effect internal friction Angle, cohesive force, the poisson ratio of the sliding bed weak the soil arch effect. four kinds of parameter’s influence on the soil arch effect there are extreme, that is more than the extreme influence weakened;③Draw a sliding surface strength parameters of pile and soil arching effect plays a role of weakening. Parameters are extreme value, more than extreme strength of sliding surface parameters on the influence of soil arching effect weakened. |
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