Prestressed Anchorage Research And Engineering Application

With the rapid development of our country’s economic construction and the continuing acceleration of urbanization, our country’s construction of infrastructure is in a period of vigorous development,In areas such as water conservancy, transportation, energy and other infrastructure producing a large number of high-slope and foundation engineering. Prestressed anchor rope stabilization can fully play the self-supporting’s potentiality, adjust and improve the soil’s strength and self-stability, reduce the weight of the supporting structure, save engineering materials, and ensure the security and stability of the construction, which has significant economic and social benefits. Therefore, prestressed anchorage technology are widely used in highway, railway, and water conservancy projects such as landslide, high slope supportPotential for its advantages of small perturbations of geotechnical, fast construction, economy security and so on.This article will focus on the load transfer mechanism of prestressed anchor, the stress prestressed loss mechanism and the long-term performance of prestressed anchor to conduct a systematical research. Proposing analytical and slope stability analysis methods according to the actual high-slope prestressed anchor reinforcement engineering Resigning prestressed anchor based on the patent "inner pressure dispersion-type anchor anchor carrier",while exploring and researching the construction process of prestressed anchor at the same time. In the aspect of monitoring prestressed anchor, this article analyzes the detection system based on the flux sensor and mainly studies the means of detection of FBG.The specific studying context includes the following aspects:(1)Explore the load transfer method about the anchorage section of pre-stressed anchorage cable. Based on elasticity Kelvin (kelvin) problem prestressed elastic solution derived anchor rope, elastic stress distribution solution. According to the main pressure type cable failure mode, we analyze the pressure type cable load transfer mechanism theoretically. In considering three-dimensional stress of grouted body, select the appropriate load transfer model to establish the basic equation reflects pressure type cable grout bonding interface with rock interaction law and solve the distribution of interfacial shear stress and grouted body axial stress. At the same time, analysis different rocks and anchoring material parameters’impact on the stress distribution. Theoretically, Explains the characteristics of pressure-type Prestressed load transfer and main influencing factors. Based on Mindlin Solution, using integral method to analysis the distribution of pressure-type rock bolt anchorage segment surrounding rock stress.(2)From the material properties of pre-stressed anchor cable and anchorage, mechanical properties of anchored media, construction technology and management level and other aspects, we will analysis the prestressing loss of anchor cable. Also we will conduct a research concerning prestressing loss which is caused by the foundation settlement of anchorage pier, and take into account the deformation influence of the soil in three-dimensional stress under the prestressed anchor pier, introducing the constitutive relation of elastoplasticity to illustrate the deformation characteristics of the soil, and thus carry on a research about the prestressing loss of anchor cable, which is caused by the foundation settlement of anchorage pier.(3) Discussing the long-term integrated control measures of prestressing anchor, in connection with prepressing losses of anchorage, to provide certain reference for engineering design and construction.(4)Concerning about actual project, do the prepressed anchorage design for high slope. Based on the analysis of geological, select a typical cross-section calculations under different working conditions of stress and strain. Calculate the slope stability reinforcement load using mechanical parameters derived by the inversion. Design the prepressing anchor based on the invention patent of the pressure dispersion-type anchor carrier. At the same time, complete research and analysis of technical construction essentials for prepressing anchorage.(5)Research on the monitoring of prestressed anchor cable including the monitoring content, the basic requirement of the project, monitoring, etc. Research based on the magnetic flux of prestressed anchor monitoring system, maily focus on the testing method of Fiber Bragg grating, improving the Existing prestressing anchor cable steel strand and form Smart steel strand based on Optical fiber grating sensor and through make experiment on stress sensing performance and temperature sensing performance of smart steel strand to prove that Smart steel strand can completely meet the basic conditions for measuring anchor cable.