Weakly cemented soft rock coring device and method

Abstract

The invention provides a weakly cemented soft rock coring device and method and belongs to the technical field of rock mechanics. The device comprises a core-drilling machine frame, a hydraulic lifting module, a motor module, a main shaft, a drill bit, a refrigeration and dehumidification system, a dust collection system, a flexible transparent cover and a rock block fixing device; the core-drilling machine frame comprises a top truss, a stand column, a height adjusting device and a base; the hydraulic lifting module comprises an oil injection module, a flow monitoring module and an internal telescopic oil cylinder; the oil cylinder is connected with the top truss and the motor module and is used for controlling the drill bit to ascend and descend at a constant speed; the drill bit is fixed to the main shaft through a top end fixing thread; the motor drives the drill bit to rotate; the flexible transparent cover on a main shaft sleeve is used for isolating an external environment; andthe rock block fixing device on the base can well fix a rock block body, and therefore, the instability of the rock block body in a core-drilling process is prevented. With the weakly cemented soft rock coring device and method of the invention adopted, high-precision core drilling of various soft rocks can be realized, secondary damage to a test piece caused by human factors is avoided, and coredrilling efficiency is improved.

Description

Technical field [0001] The invention relates to the technical field of rock mechanics, in particular to a device for coring weakly cemented soft rock. Background technique [0002] Weakly cemented soft rock is widely distributed in my country. It is affected by special geographical and climatic environment, sedimentary process and geological conditions to form its unique engineering and physical and mechanical properties. The typical characteristics are low strength and poor cementation. In the natural state, the structure is relatively dense and Complete, but easy to soften or even disintegrate after encountering water, and the mechanical properties are unstable, which brings huge economic losses and safety threats to the green mining of mineral resources and various engineering constructions in my country. Nowadays, indoor testing of soft rock sampling and processing, and studying its physical and mechanical properties have become a necessary means to study soft rock engineering...

AI Technical Summary

Problems solved by technology

Most of the coring machines now use manual rotation to control the descent of the drill bit, which cannot maintain a constant working speed, which will cause multiple disturbances during the coring process and affect the accuracy and integrity of the rock sample.

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