Research And Analysis On The Force Mechanism Of Tension Type Anchor Cable In The Case Of Pore Bending

As one of the most effective reinforcement technology, the prestressed anchor cable technology has been widely used in railway, highway, water conservancy and hydropower, industrial and civil construction projects. It is mainly through giving full play to the rock's self potential, regulating and improving the self strength and self stability of the rock and soil, reducing the weight of the support structure and other aspects to achieve its supporting function. In addition, the prestressed anchor cable can save engineering materials, ensure the safety and stability of the construction, so it has significant economic and social benefits. But due to the influence of natural factors and technical factors, anchor in practical engineering construction and easy to occur borehole and pore bending problems, especially in large tonnage, long depth of anchor cable drilling in the problem is particularly prominent. In order to get more realistic stress condition, the research on the force mechanism of anchor cable under the condition of channel bending is more and more worthy of attention. This paper mainly through the two aspects of theoretical research and model test is used to study the problem analysis. Theoretical research. In this paper, based on the Mindlin solution is the prestressed anchor cable in the channels under bending of anchoring section stress formula, around the anchorage segment are the shear stress and radial stress distribution,and the channel does not occur bending of the contrast and analysis; model test research,mainly with a certain strength of concrete to simulate rock mass and pre embedded anchor component with a certain radian, through classification Zhang stayed prestressed anchor cable to measure in force in the process of pore curvature cable around the shear stress, radial stress distribution and anchor cable prestress losses. Finally, the model test results to verify the correctness of the theoretical research and practical.The main works are as follows:(1) according to the semi infinite space theory of Mindlin solution is near the prestressed anchor head rock stress field of theoretical formula; and the combination of the relevant knowledge of the basic theory of elastic mechanics space, obtains the anchoring section of prestressed anchor cable and the surrounding rock mass exchange at the interface shear force formula of radial force and stress.(2) using MATLAB and mathematics and mathematical calculation software, and combined with examples to derive the theoretical formula was applied and verified, and gives the shear stress and radial stress distribution, and the discussion and analysis of its stress characteristics, distribution and influencing factors.(3) through the model test of simulated pore curvature cable in tension in the process of stress, mainly on the radial force and the shear stress around the anchorage segment stress distribution rules and prestress losses are measured and analyzed, and a comparative analysis with the results of theoretical derivation. The results show that thetheoretical model of the calculation method is feasible.