Device for detecting critical flow velocity and settlement rate of backfill slurry and method for detecting critical flow velocity and settlement rate of backfill slurry by using device

Abstract

The invention discloses a device and a method for detecting critical flow velocity and settlement rate of backfill slurry, and belongs to the field of mining backfilling. A feeding pipe of the detection device is fixedly mounted on an upper part of a cylindrical barrel and is communicated with the cylindrical barrel; a laser speedometer and a scale are respectively fixed on an outer part of the cylindrical barrel; a straight angle stirring rod and a variable-frequency speed regulation motor are arranged in the cylindrical barrel in a connecting manner and are coaxial to the cylindrical barrel; a high-definition camera is supported by a hydraulic support and positioned outside the cylindrical barrel; through circumferential motion of the backfill slurry in the cylindrical barrel, the flow velocity of the slurry is detected by using the laser speedometer, and a settlement process of the backfill slurry is observed by using the high-definition camera, so that the critical flow velocity and the dynamic settlement rate of the backfill slurry in a flowing process can be obtained. According to a detection result, through theoretical analysis, a critical flow velocity mathematical model, and a dynamic settlement rate mathematical model of the backfill slurry and a correlation are established. According to the detection device and method disclosed by the invention, a certain and reliable scientific support is provided for theory and technical study on pipeline transportation of the backfill slurry.

Description

technical field [0001] The invention relates to the field of mine filling, in particular to a detection device for critical flow velocity and settling velocity of filling slurry in a pipeline and a detection method using the device, which is suitable for detection and research on the transmission characteristics of large-diameter pipelines for filling slurry. Background technique [0002] In the field of mine filling, the filling slurry belongs to the subsiding solid-liquid two-phase flow, and the filling slurry in the non-paste state has subsidence, and when it is transported at a low flow rate, pipeline blockage and wear will occur due to the subsidence. Critical flow velocity and settling velocity are the main transport characteristic parameters of filling slurry in the pipeline, which play a decisive role in the stability of filling slurry pipeline transportation and are used to guide the design and operation of underground mine filling system. [0003] At present, there...

AI Technical Summary

Problems solved by technology

Since the filling slurry is a mixed slurry formed of aggregate, water and ultra-fine cementitious materials, it is difficult to monitor the dynamic settlement and critical velocity of the filling slurry flowing in the pipeline

The value of the critical flow velocity of the filling slurry pipeline is generally calculated by the empirical formula, and the error is relatively large; the detection of the filling slurry settlement rate mostly uses the method of the static settlement test of the vertical bucket, which is difficult to be directly used for the dynamic filling slurry. For the detection and analysis of settlement, there is still a lack of detection devices and methods for dynamic settlement and critical flow velocity in the flow process

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