Experimental method and device for stress wave propagation in rock-like material under gradient static stress

Abstract

The invention relates to a testing technique for stress wave propagation law, in particular to an experimental method and device for stress wave propagation in a rock-like material under gradient static stress. The invention proposes a combined loading method for realizing axial dynamic stress and gradient static stress of large-sized rock-like material specimens, and designs an axial gradient static stress loading device for rock-like materials, wherein the device is capable of realizing static stress gradients of different sizes, and furthermore, the test of stress wave propagation in the rock-like materials under gradient static stress is realized through the combination with the dynamic loading device and a data acquisition and analysis system. The experimental method and device provided by the invention are simple and easy in operation, and compared with the prior art, the experimental method and device are greatly improved in static stress gradient size, dynamic loading size, test accuracy and other aspects, and can provide more effective guidance for relevant theoretical researches and engineering practice.

Description

technical field [0001] The invention relates to a loading technology for large-scale rock-like material specimens under the combined conditions of gradient static stress and dynamic load, in particular to an experimental method and device for stress wave propagation in rock-like materials under gradient static stress. Background technique [0002] In recent years, in view of the frequent occurrence of earthquake disasters and the actual situation of demolition of buildings (structures) by blasting and excavation of various underground geotechnical engineering, in order to achieve the purpose of disaster prevention and mitigation and safe and efficient construction, stress waves are applied in various types of rock and soil The propagation characteristics in solid or concrete media have always been one of the hotspots of research. [0003] When the blasting stress wave propagates in the underground rock mass, the surrounding rocks at different distances from the seismic sourc...

AI Technical Summary

Problems solved by technology

Although there is also a device that applies gradient static stress and dynamic load to the specimen through the combination of suspension counterweight and vibration exciter, this device has two disadvantages: one is that the static stress gradient and dynamic load that the device can achieve are equal. Second, the accuracy of the device is low, and it cannot meet the accuracy requirements for studying the stress wave propagation characteristics of rock-like materials under gradient static stress.

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