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A test method for secondary grouting strengthening bearing characteristics of broken rock mass

A secondary grouting and characteristic test technology, applied in the direction of strength characteristics, preparation of test samples, and application of stable tension/pressure to test material strength, etc., to achieve the effect of easy operation and reasonable steps

Active Publication Date: 2021-03-30
HENAN POLYTECHNIC UNIV
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  • Claims
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Problems solved by technology

[0004] Aiming at the problem that grouting strengthening is still guided by experience, the present invention proposes a test method for the bearing characteristics of secondary grouting strengthening of broken rock mass

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  • A test method for secondary grouting strengthening bearing characteristics of broken rock mass
  • A test method for secondary grouting strengthening bearing characteristics of broken rock mass

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Embodiment Construction

[0020] The present invention will be described in further detail below in conjunction with accompanying drawings and examples.

[0021] The invention provides a test method for secondary grouting strengthening bearing characteristics of a broken rock mass.

[0022] Step 1. According to the purpose of the experiment, determine the lithology and particle size of the test, select the shape and size of the mold, and design the number of reserved grouting holes;

[0023] Step 2, place the bottom plate 8 flat, and then install it with the left and right wall panels 6 and the front and rear baffles 7, insert the fixing pin 1, measure the verticality of the four sides, ensure that the mold size error is not greater than ±0.5mm, insert the top plate 4 and fix it Apply lubricating oil to ensure smooth contact surface with the rock block;

[0024] Step 3, place the assembled mold in the center of the bearing plate of the rigidity testing machine, and use a dynamic tamping machine to fil...

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Abstract

The invention discloses a fractured rock mass secondary grouting enhanced bearing characteristic test method. The fractured rock mass secondary grouting enhanced bearing characteristic test method mainly comprises the steps that a manufacturing shape and size of a mould are selected, and the number of reserved grouting holes is designed; the mould is placed at the center of a rigid testing machinebearing plate after being assembled; broken stones are screened to perform pavement and compaction; cement grout is poured in until no infiltration occurs and then the surface of a fractured rock mass is smoothed and placed statically; a rigid testing machine is started secondarily to compress to rock mass peak strength and then unloaded; holes are reserved in a bearing plate to vertically drillthe grouting holes, and secondary grouting reinforcement is carried out on the cement grout; and after a testing piece is placed statically for a time, secondary uniaxial compression test is carried out, data collection and analysis are carried out, and the test is completed. The production of multi-surface groove butt joint and full-sealing mould are adopted, different numbers of the reserved grouting holes are set, first grouting and secondary grouting of the fractured rock mass in the mould are realized, and the accuracy of the fractured rock mass secondary grouting enhanced bearing characteristic test is improved.

Description

technical field [0001] The invention relates to the technical field of mine roadway and tunnel support, in particular to a test method for secondary grouting strengthening of broken rock mass bearing characteristics. Background technique [0002] In mine roadway and tunnel engineering, fault fracture zones or weak and dense rock formations are often encountered. With the excavation of the project, the rock mass will be broken and cracks will develop, resulting in the phenomenon of slabs and roof collapse during mining, which will increase the difficulty and risk of construction. , corresponding technical measures must be taken. Practice has proved that the grouting reinforcement of the broken rock mass in underground engineering has a good effect on changing the strength of the broken rock mass, exerting the bearing capacity of the rock mass, and ensuring the safety of underground roadways and chambers, and has achieved the goal of increasing the strength of the broken rock ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/12G01N1/28
CPCG01N1/28G01N3/12G01N2203/0048G01N2203/0067G01N2203/0682
Inventor 辛亚军吕鑫姬红英董帅郝海春
Owner HENAN POLYTECHNIC UNIV
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