Instrument and method for measuring volume fissure rate of rock

Abstract

The invention discloses an instrument and method for measuring the volume fissure rate of rock, and the instrument comprises a substrate, a skeleton, a fissure aiming device, a fixing device, and a hand-cranking device. A screw rod rotates under the action of the hand-cranking device, and drives the fissure aiming device on the fixing device to move up and down through threaded transmission. During measurement, the substrate is placed on the rack, and a plane where the substrate is parallel to an extending plane of fissures of a fissure group of a to-be-detected rock. A plane where a laser beam and a zero scale line on a calibrated scale on a side surface of the substrate is parallel to an extending plane of fissures of the fissure group of the to-be-detected rock, and one fissure of the fissure group of the to-be-detected rock is taken as the start point for the measurement from the bottom to the top. The true fissure width of each fissure in the fissure group and the distance between each fissure and the start point are recorded, wherein the measured fissure width is the true fissure width. The measurement data is accurate, and provides parameters for the calculation of the volume fissure rate of rock. The instrument is smaller in size, is light, and is portable. The application method is simple, so the instrument is suitable for the measurement of the volume fissure rate of outdoor rocks.

Description

technical field [0001] The invention belongs to the fields of geological survey and geotechnical engineering, and in particular relates to an instrument and method for measuring the fissure ratio of rock mass in the field. Background technique [0002] For large-scale construction of infrastructure such as railways and highways, it is particularly important to measure the quality of rock mass in the early stage. The most critical factor to measure the quality of engineering rock mass is the development of rock mass fissures. The development characteristics of cracks can be reflected by many indicators, among which the commonly used indicators are: line crack rate, surface crack rate and volume crack rate. The natural properties of the rock mass determine that the most discriminative index for engineering rock mass quality is the body fracture ratio. [0003] In related technologies, the methods for measuring the fracture ratio of rock mass are the field water injection tes...

AI Technical Summary

Problems solved by technology

The field water injection experiment is simple to operate, but it can only judge the development and connectivity of rock mass fissures, and cannot perform quantitative calculations; inside the rock mass, sometimes there are one or several fissures with good connectivity, which can be used for field analysis. The judgment of the results of the water injection experiment has a great influence, so there is a certain blindness in the judgment of the rock mass fracture ratio by the field water injection experiment

Random construction of a 3D fracture network model is more complicated than field water injection tests, and it is more difficult to use in field construction

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