Three-axis loading and unloading rheometer and test method for dynamic disturbance low temperature rock

Abstract

The invention relates to a dynamically-disturbed low-temperature rock triaxial loading and unloading rheometer and test method. The rheometer comprises a dynamic disturbance system, a frame, a guide rail, a lifting mechanism, a pressure chamber, a trolley, a temperature control system, an axial loading system, a confining pressure loading system, a measuring system, a control system and a computer and software system, a loading cylinder in the axial loading system can switch between a lead screw booster and a servo valve through a switching valve, a servo oil source, a servo valve and a loading cylinder are communicated through the switching valve when a conventional triaxial compression test is performed, the lead screw booster is communicated with the loading cylinder through the switching valve when a triaxial rheological test is performed, and rock samples are subjected to dynamic disturbance by the aid of a weight dynamic disturbance system or an impacting cylinder disturbance system. The rheometer effectively achieves rock triaxial loading and unloading rheological tests and conventional triaxial compression tests under the conditions of negative temperature and dynamic disturbance and is simple in integral structure principle, variable in function and high in applicability.

Description

Technical field: [0001] The invention belongs to the technical field of rock mechanics test equipment, and relates to a three-axis loading and unloading rheometer and a test method for dynamic disturbance low-temperature rock. Background technique: [0002] The Ordos Basin in Northwest my country is rich in coal reserves. The 13th Five-Year Plan clearly states that the eastern region should be restricted, the central and northeast regions should be controlled, the development of coal resources in the western regions should be optimized, and the green mining and transformation of large coal bases should be promoted. It can be seen that the development and utilization of coal resources in the western region is of great significance to the national economic development and energy security strategies. However, the lithology of the rock strata within the mining depth range in this area is quite different. And the groundwater in the water collection corridor of the fault zone is r...

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Problems solved by technology

[0003] At present, there are many studies on the triaxial compression and rheological properties of fractured rock mass, but due to the lack of advanced equipment, the research on triaxial compression test and triaxial rheological properties of fractured rock mass under low temperature and disturbance conditions is still blank. The mechanical properties of the triaxial compression and the time-varying mechanical behavior of the low-temperature fractured rock mass after disturbance are still unknown; in addition, the deformation of the low-temperature fractured rock mass over time will exert force on the concrete well wall, making the newly poured concrete The well wall is subject to dual effects of rock wall deformation and blasting vibration, and there is no data available for the rheological characteristics and stability evaluation under the disturbance effect.

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