Measuring device and method for radial acoustic properties of rock core

Abstract

The invention discloses a rock core radial acoustic characteristic measuring device and a rock core radial acoustic characteristic measuring method. The device and the method are used for improving the measuring precision. The measuring device comprises a rack, and a rotating platform and a radial acoustic characteristic measuring assembly which are arranged on the rack; a clamp for clamping a rock core is arranged on the rotating platform; the radial acoustic characteristic measuring assembly comprises two detection parts arranged on the two sides of the rock core, each detection part comprises a base and an acoustic emission probe, the side, facing the rock core, of each base is concaved inwards to form a sliding cavity, a sliding block is arranged in each sliding cavity in a matched andsliding mode, and each sliding block extends out of the corresponding base to be connected with the corresponding acoustic emission probe; an air pressure chamber is formed between the sliding blockand the sliding cavity, a pressure release valve for maintaining stable air pressure is arranged on the air pressure chamber, the air pressure chamber is connected with an air pressure pump, and a displacement sensor for measuring the distance between the two acoustic emission probes is further arranged on the rack; and the axis of each sliding cavity is parallel to the signal transmission direction of the acoustic emission probes, and the two acoustic emission probes are symmetrically arranged in the radial direction of the rock core.

Description

technical field [0001] The invention relates to the technical field of rock testing, in particular to a measuring device and a measuring method for radial acoustic properties of a rock core. Background technique [0002] Deep geological core is the physical data that must be collected for deep geological research and mineral exploration. Through the drilled cores, various physical and mechanical properties, structure and structural characteristics, mineral composition and grade, rock thickness and buried depth, spatial distribution and interrelationship of ore and rock mass can be known, providing insights into geological structure, geophysics, It provides a reliable basis for mineral resource evaluation, ore deposit mining and engineering building design. [0003] Nowadays, indoor testing of various physical and mechanical properties of rock cores has become a necessary basic link in core research; among them, the axial wave velocity measurement of rock cores can understan...

AI Technical Summary

Problems solved by technology

However, compared with the measurement of the axial acoustic properties of the core, which only needs to be measured once at both ends, the measurement of the radial acoustic properties of the core requires multiple sections of the core and multiple radial measurements of the same section, and the number of measurements is hundreds of times Compared with the axial length of the core, the diameter of the core, especially the diameter of the deep core, is small, and a small diameter measurement error is likely to cause a large measurement error; the most important thing that cannot be ignored is the existing manual measurement However, there are problems such as the joint between the acoustic emission probe and the core cylinder is not tight, the axes of the probes on both sides are difficult to be collinear and the contact pressure deviation of the probes, which further amplifies the measurement error

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