The Principle Of Three-dimensional Cave Arch And Its Application In Anchor Point Design

In recent years, with the rapid development of the national construction,various infrastructure projects in the steep slope protection works more and more,scale become larger and larger,supporting become more and more difficult. So more and more into being a new slope support structure, anchor point is developed from the pile anchor structure. Rock and soil, piles, prestressed anchor is a common between the three body force,their mutual constraints and constraints,prestress on the supporting structure will change the soil pressure distribution,thus affecting the supporting structure of the internal force. How to build a better bolt structure calculation model, research supporting structure of the earth pressure distribution,analysis of soil arching on the impact of bolt structure,is an urgent need to solve engineering problems.Soil arching effect is a very common phenomenon In the Geotechnical engineering, and its supporting structure formation is due to the interior of the interaction of Earth, allowing the redistribution of earth pressures, this paper will appear that the pressure in space Redistribution is called three-dimensional cave arch.In practical engineering application, the point is not the anchor structure to complete the form Lang willing to bear the load of earth pressure, under certain conditions, taking into account the interaction between pile and soil, the soil pile interaction vertical cable interaction between the soil arching can be formed, there collapsing arch. As the relative displacement of soil or the relative displacement trends, which in the horizontal direction and vertical direction of soil arching effect produced.In this paper, results of previous studies based on theoretical deduction and the finite element method of combining simulation to explore the structure of two-dimensional collapse of bolt and three-dimensional cave arch arch formation mechanism and influencing factors, according to soil arch feet and the dome's strength failure conditions, derived after the two-dimensional level of the pile collapsing arch reasonable arch axis of the equation, the analytical expression of the high arch and its formation conditions, to further consider the three-dimensional collapse derived branch of arch earth pressure on retaining structure analytical expression.Second, analytical derivation of the previously simulated demonstration. Numerical simulation methods used prestressed cable reinforced slope two and three-dimensional finite element analysis, demonstration pile of bolt within the three-dimensional structure of the presence of arch collapse. And in reference to the theoretical findings based on the analysis of pile-anchor structure of Middle-earth stress field and displacement field of the characteristics and laws, and study various factors affecting the soil arch.Finally, theoretical analysis and numerical simulation based on the combination of a specific engineering, the application of theory to point anchor structure of the formula calculation of earth pressure by considering soil arching effect of soil pressure calculation of the proposed method, but also further evidence of the pile anchor structure within the practical point.