Experimental device and method for simulating excavation unloading in in-situ stress state

Abstract

The invention provides an experimental device and method for simulating excavation unloading in an in-situ stress state, and the experimental device comprises a double-shaft four-way electromagnetic Hopkinson bar system, a pressure relief system, and a data monitoring and control system. The biaxial four-way electromagnetic Hopkinson bar system is used for loading a static load on a sample or simulating impact load disturbance in a roadway excavation process, loading, maintaining, unloading and dynamically adjusting loading and unloading rates; the pressure relief system is used for accurately simulating an asynchronous excavation unloading process in a real unloading process by controlling the pressure relief rates and the unloading starting time of different positions of a simulated roadway in the rock sample; and the data monitoring and control system is used for controlling the double-shaft four-way electromagnetic Hopkinson bar system and the pressure relief system and recording and storing test data. The invention further provides a method for simulating excavation unloading when the rock is in the in-situ stress state. According to the invention, the unloading rate can be accurately controlled, and the complex working condition of dynamic and static combined loading is simulated.

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