Research Of The Application Of Ultrasonic Guided Waves In Non-destructive Testing Of Rock Bolts

Geotechnical engineering and mine construction, geotechnical anchor technology with greater stiffness, strength and other mechanical properties of the metal rod with the surrounding rock mass together make up the anchoring system, in order to strengthen and support rock and soil, At the same time play and mobilize their own strength and self-stability of the rock mass and, ultimately, stable anchoring engineering and technical engineering structures. Due to its remarkable economic and social benefits, geotechnical engineering technology in the world anchoring has been widely developed and applied. The anchor structure system, due to the anchoring construction process is difficult to avoid the crack and cavity filling time, and can not guarantee the density of the filling. Further, since, in service after a certain period of time, often due to the variation of geological conditions or blasting, impact caused by the heavy machinery and seismic forces resulting anchor failure. Buried in the structure of the major projects bolt failure will cause huge economic losses and even disastrous consequences. Therefore, in order to avoid accidents in the various types of geotechnical engineering, to ensure the safety of the construction process, improve the reliability of the structure, security, each major construction projects must pay attention to the problem. The solution to this problem you need to have accurate and reliable, convenient and practical detection technology to achieve. Therefore, when using metal rods supporting the anchorage, we must anchor rod quality safe and accurate testing. Detection method of anchoring quality is yet to be perfected, more traditional drawing method and coring method has been devastating, can only do the sampling inspection, can not be on the actual situation to make comprehensive testing. With researchers at home and abroad in the pipeline structure system to detect cracks in the successful application of ultrasonic guided wave method, this method is also proposed to use bolt detection in roadway surrounding rock support. In this new field of ultrasonic guided wave propagation theory has improved steadily, also achieved good results in the experiments and simulations, but this approach to the systematic application of engineering practice need further study. Previous results of ultrasonic guided waves in a cylindrical waveguide propagation theory analysis, summarizes the results of these theoretical models produced in the laboratory, through a large number of experimental studies to analyze the collected data, a detailed explanation of ultrasonic guided waves in the anchor bolts. The propagation rule in the free rod and rod, explores a use of high frequency ultrasonic guided waves to detect new bolt length, laid the foundation for the non-destructive testing of ultrasonic guided wave is applied to the actual project anchoring quality. A simple numerical simulation as a fast and efficient way, through the computer can accurately simulate the actual ultrasound guided wave propagation in the bolt can be a good guide laboratory studies, this paper ANSYS-LSDYNA software simulation to verify the dispersion law of the wave guide, and were compared and the results of the experiment, and effectively guide the experimental process parameter selection.