Method for improving tensile strength of full-tailing cemented filling body by utilizing rice straws

A technology of rice straw and tensile strength, which is applied in the direction of applying stable tension/compression to test the strength, strength properties, and preparation of samples for testing, etc., to achieve the effects of simple addition, improvement of tensile strength, and cost reduction.

Active Publication Date: 2020-05-29
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the application of rice straw in filling cannot directly imitate the application of natural fiber in construction, and must be studied

Method used

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  • Method for improving tensile strength of full-tailing cemented filling body by utilizing rice straws
  • Method for improving tensile strength of full-tailing cemented filling body by utilizing rice straws
  • Method for improving tensile strength of full-tailing cemented filling body by utilizing rice straws

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A method for improving the tensile strength of a full tailing sand cemented filling body by using rice straw, comprising the following steps:

[0042] Preparation of rice straw: collect local rice straw and process it into a length of 6-15mm;

[0043] Collect rice straw, peel the rice straw, remove the joints, soak in 4% NaOH solution for 24 hours, wash the rice straw with water until neutral, dry the rice straw and process it into a sample with a length of 6 mm to 15 mm for use.

[0044] Preparation and maintenance of the filling body sample: According to the proportion of the filling body measured on site, first mix the cement and tailing sand evenly according to the ratio in Table 1, and add an appropriate amount of water to prepare a cubic filling body sample of 70.7×70.7×70.7mm ;

[0045] Table 1 Ratio of filling body samples without adding rice straw

[0046] Lime-sand ratio concentration / % Rice straw length / mm Rice straw content / % 1:4 74％ 0...

Embodiment 2

[0062] Preparation of rice straw

[0063] Collect rice straw and process it into a length of 6-15 mm; collect rice straw, peel the rice straw, remove the joints, soak in 4% NaOH solution for 24 hours, wash the rice straw with water until neutral, and dry the rice straw Afterwards, it is processed into a sample with a length of 6 mm to 15 mm for use.

[0064] Preparation and maintenance of filling body samples

[0065] According to the proportion of the filling body measured on site, the cement and the tailings were mixed evenly according to the ratio in Table 2, and then rice straw with a length of 6mm was added. The dosage of each group of samples was 0.2‰, 0.4‰, 0.6‰, 0.8‰, and finally add an appropriate amount of water to prepare a 70.7×70.7×70.7mm cube filling sample with rice straw added;

[0066] Table 2 Material ratio of filling body sample with 6mm long rice straw added

[0067]

[0068] Sample material preparation

[0069] Before preparing the sample, the moist...

Embodiment 3

[0091] Preparation of rice straw

[0092] Collect rice stalks and process them into 6-15mm lengths;

[0093] Collect rice straw, peel the rice straw, remove the joints, soak in 4% NaOH solution for 24 hours, wash with water until the rice straw is neutral, and process the rice straw into a sample with a length of 6 mm to 15 mm after drying. .

[0094] Preparation and maintenance of filling body samples

[0095] According to the proportion of the filling body measured on site, the cement and the tailings were mixed evenly according to the ratio in Table 4, and then rice straw with a length of 9mm was added. The dosage of each group of samples was 0.2‰, 0.4‰, 0.6‰, 0.8‰, and finally add an appropriate amount of water to prepare a 70.7×70.7×70.7mm cube filling sample with rice straw added;

[0096] Table 4 Material ratio of filling body sample with 9mm long rice straw added

[0097]

[0098] Sample material preparation

[0099] Before preparing the sample, the moisture co...

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Abstract

The invention provides a method for improving the tensile strength of a full-tailing cemented filling body by utilizing rice straws, and belongs to the field of metal mine underground filling. The parameters of the added rice straws in the method for improving the tensile strength of the filling body are as follows: the length of the rice straws is 6-15mm, and the mixing amount accounts for 0.02-0.08% of the solid mass. According to the method, the tensile strength of the filling body is researched, the rice straws are selected as the material for improving the mechanical property of the filling body, a series of tensile strength tests are conducted, finally the method capable of effectively improving the tensile strength of the filling body is obtained, and the increasing rate of the tensile strength compared with that of a common filling body is calculated. According to the method, the tensile strength of the filling body prepared by adding rice straws with different lengths and mixing amounts is far higher than that of a common filling body without rice straws.

Description

technical field [0001] The invention belongs to the related technical field of mine underground goaf filling and mechanical performance research of filling body, and specifically relates to a method for improving the tensile strength of full tailings cemented filling body by using rice straw. Background technique [0002] With the depletion of shallow resources, metal mines around the world are gradually turning to deep mining, and the characteristics of filling and filling mining determine that it is the preferred method in deep mining. The filling mining method can control the formation pressure, maximize the recovery of ore, improve the efficiency of the ventilation system, provide a safer working environment for miners, and contribute to waste-free mining, sustainable development of mines, and environmental protection. The strength of the filling body is a key parameter to measure the filling quality, especially the compressive strength and tensile strength of the fillin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N3/14
CPCG01N1/28G01N3/14G01N2203/0017G01N2203/0033Y02W30/91
Inventor 王石宋学朋魏美亮柯愈贤
Owner JIANGXI UNIV OF SCI & TECH
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