Operational method for measuring creep parameters and infiltration parameters of smashed rocks simultaneously

Abstract

The invention relates to an operational method for measuring creep parameters and infiltration parameters of smashed rocks simultaneously, which realizes loading of axial pressure and infiltration pressure difference by the aid of a smashed rock creep-infiltration full-process coupling testing device. The operational method includes: firstly, determining initial height of rock in a cylinder before loading, starting an axial loading device then, starting an electric test pump to saturate rocks, applying axial load, injecting water to the rocks to infiltrate according to set water pressure, finally changing the axial load to perform the creep-infiltration test of the next-grade stress stage. The infiltration characteristic parameters are obtained by matching of a scatter diagram of hole pressure gradient and average infiltration speed and the Forchheimer formula, and the creep parameters are obtained by matching of Kelvin-Volgt creep model and an axial strain time curve. The operational method has the advantages that creep model during creep and infiltration full-process couple of the smashed rocks can be acquired, mutual affection of creep and infiltration can be indicated through the parameters, operation results can provide theoretical basis for theoretical analysis and numerical value simulation of creep-infiltration of the smashed rocks.

Description

technical field [0001] The invention relates to a method for testing the mechanical properties of broken rocks, in particular to an operation method for simultaneously measuring creep parameters and permeability parameters of broken rocks. Background technique [0002] The broken rocks in engineering can be roughly divided into two categories: one is the in-situ broken rocks that are still in the original position after being broken by structure and mining, and the other is broken and caving due to engineering excavation and can be broken under high pressure. Recompacted piles of broken rock. Broken rock is characterized by large porosity and high permeability, and its time-dependent deformation (especially creep) and seepage behavior will have a serious impact on the migration of liquid and gas inside the rock and the long-term stability of ground buildings. At present, the research on deformation and seepage coupling of crushed rock under pressure is a hot topic in wat...

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Problems solved by technology

[0003]At present, many studies have been carried out on seepage and creep of broken rock as two independent processes or a staged coupling process of seepage and creep. However, the experimental results of the interaction between the two and the research data on the permeability characteristics test in the whole process of creep are very few, mainly because of the lack of operating system and operation method for the whole process of creep-permeation coupling of broken rocks.

Although Li Shuncai and others have designed a patented device for coupling the creep and penetration of broken rocks (ZL 201120034981.3), this is only an operating device, and has never involved the simultaneous measurement of creep parameters and penetration of broken rocks during the full coupling of creep and penetration. The operation method of the parameter

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