Coal-measure rock residual expansion coefficient measuring method and system

Abstract

The invention provides a coal-measure rock residual expansion coefficient measuring method and system. The coal-measure rock residual expansion coefficient measuring method is characterized by comprising the steps that 1, the initial volume V initialization is measured; 2, a to-be-measured rock is placed in a stamping cylinder, through a cotton rope, a drop hammer is fixed into a fixing frame, andis lifted to be at a certain height, the fine rope is loosened to make drop hammer fall into the stamping cylinder to crush the rock, crushing operation is repeated until the fragmentation of the to-be-measured rock meets the requirements, and fragments of the to-be-measured rock are placed in sampling meshes for separation; 3, the fragments of the to-be-measured rock are placed in a pressing cylinder, through a hydraulic oil pump, a portable hydraulic jack installed on a rack is driven to extend for a certain height, then a load transmission column is pushed to transmit downward pressure tothe fragments of the to-be-measured rock in the pressing cylinder, stress pressure is applied on the fragments of the to-be-measured rock, and the volume after crushing is conducted is calculated; 4,a rock residual expansion coefficient is calculated.

Description

technical field [0001] The invention belongs to the field of rock mechanics and mining, and in particular relates to a method and a system for measuring the residual dilation coefficient of coal-measure rock. technical background [0002] When rocks are broken, they increase in size. This property is called dilatation of rocks. The rock breaking coefficient refers to the ratio of the volume of the rock in a loose state after crushing to the original volume of the rock in a whole state before crushing. [0003] The broken rock will decrease in volume under pressure. This property is known as the compaction of rock. The residual dilation coefficient of rock refers to the ratio of the volume of rock under different pressures after crushing to the original volume before crushing. [0004] It can be seen from the above definitions that the rock fragmentation coefficient can be regarded as a special case of the rock residual fragmentation coefficient—the residual fragmentation...

AI Technical Summary

Problems solved by technology

Existing devices for measuring the coefficient of dilatation and residual dilatation of rock generally use the drainage method (putting the rock directly or into water after sealing it with wax) to measure the original volume of the rock, and there are two outstanding problems: ① The original volume of the rock cannot be achieved Measurement (does not damage or pollute the rock to be tested); ②Limited scope of application (not suitable for irregular shapes, hydrophilic swelling rocks)

This makes the cutting, processing and transportation of coal-measure rocks difficult: it is difficult to process into standard rock samples such as round and square; long-distance transportation will easily lead to its fragmentation

[0011] Therefore, compared with ordinary rocks, it is more difficult to accurately measure the coefficient of dilatation of coal-measure rocks: (1) The rocks collected from the engineering site have complex shapes, and it is difficult to directly obtain their geometric size parameters with measuring tools such as rulers and vernier calipers, and then calculate them through conversion. ② Although the original volume of the rock can be measured by the drainage method, it will cause rock pollution (water immersion), which will affect the next test (volume measurement after crushing), and ultimately affect the measurement accuracy

[0012] To sum up, there are six outstanding problems in the existing coal-measure rock fragmentation coefficient and compressibility coefficient measurement device: ① can not realize the non-destructive measurement of rock original volume (damage, pollute rock); ② limited scope of application, not suitable for irregular shapes, Hydrophilic expansive rock; ③ The crushing and sorting system has limited functions and cannot meet the crushing and sorting requirements; ④ The loading system is a traditional press, which is "big", high in cost, and "overkill for small use", so it is not suitable for large-scale promotion; ⑤ The measurement error is large (damage measurement will lead to inaccurate measurement of the original volume of the rock); ⑥ troublesome operation (time-consuming and labor-intensive)

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