Research On Testing Technique And Reinforce Countermeasure Of Steel Anchor Pipe In Freeway Slope

Steel anchor pipe is a new type of anchor technique and its appearance concerns with the development of highway construction. Although the technique was born not long, the theoretical researching was not perfect, it has had a certain application in reinforcing the litho-logy weakness and foot stress concentration of high slope. If the key techniques can be made great progress in theory, it will be good for spreading and applying the reinforce technique of steel anchor pipe. Therefore, it is necessary to establish systemic quality assessments, spread and apply the technique, study and discuss the reinforcement measures, the durability of the structure, nondestructive testing, and detection information processing technology exploration of the reinforcement of slope with steel anchor pipe. The main contents of this paper are as following:(1) For guiding the design and construction, this paper analyzes the research and development status of slope anchor technique and its testing technique at home and abroad. Thereafter, synthetically studies the configuration design, reinforcing mechanism, durability problem and load transfer mechanism in anchor system of steel anchor pipe, and obtains the destroying reasons and forms in its anchoring system.(2) Aim at the detection problems of pre-stressed steel anchor pipe, combined with the theories of rock anchoring mechanics, viscoelastic dynamics and mechanical vibration, based on portrait wavy theory of one dimension pole, the mathematical model for the dynamic test response of the anchor system of steel anchor pipe is set up, and its viscoelastic wave equation is presented.(3) On the foundation of analyzing and processing detection signal, with the method of wavelet analysis to deal with stress wave signal for pre-stressed steel anchor pipe, and wavelet Mallat binary algorithms was applied to signal processing, and realized the purpose of accurately position the defect of pre-stressed steel anchor pipe.(4) The stress wave nondestructive testing technique was used to actually detecting reinforcement project quality of pre-stressed steel anchor pipe on a highway slope in Guangdong Province. The detection results show that the technique can accurately position the defections of anchoring quality of pre-stressed steel anchor pipe, at the same time, it can provide reliable detection data for the slope project management. The results also show the anchoring quality of pre-stressed steel anchor pipe is good, it is feasible to reinforce slope with steel anchor pipe.