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A method for evaluating the support effect of roadway anchor-net-cable system

An evaluation method and technology of anchor net and cable, which are applied in the testing of machine/structural components, instruments, measuring devices, etc., can solve problems such as insufficient support parameters, roof fall in roadways, and regardless of service life, and achieve the effect of a reliable evaluation method.

Active Publication Date: 2019-01-29
SHANDONG UNIV OF SCI & TECH
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Problems solved by technology

However, in order to save costs, some design support parameters are insufficient. Although there will be no deformation in the near future, it will cause roof fall accidents in the roadway as time goes by.
At present, the evaluation methods of anchor net and cable support effect in mine roadways at home and abroad are all based on the deformation of the roadway, and do not consider the cost and engineering cost, nor the service life.

Method used

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  • A method for evaluating the support effect of roadway anchor-net-cable system
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  • A method for evaluating the support effect of roadway anchor-net-cable system

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Embodiment Construction

[0023] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0024] A method for evaluating the support effect of a roadway anchor net cable system, comprising the following steps:

[0025] Step 1: In a representative roadway after construction, set anchor rod monitoring point 1 and anchor cable monitoring point 2, a total of 12 representative monitoring points, such as figure 1 figure 2 As shown, number 1#-12# in sequence; Among them, 1#-2# is the anchor rod of material type Φ22×2200 (Q335); 3#-4# is the anchor rod of diameter Φ20×2400 (Q335); 5#- 6# is the steel strand anchor cable of material model Φ17.8×4500; 7#-8# is the anchor rod of diameter 22mm×2200 (Q500); 9#-10# is the anchor rod of material model Φ20×2400 (Q500) ; 11#-12# is the anchor rod of material type Φ20×2200 (Q335).

[0026] First, the existing monitoring method is used to monitor the initial working resistance of the ten anchor...

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Abstract

The invention discloses a method for evaluating the support effect of roadway anchor-mesh-cable system, which mainly monitors and records the actual maximum working resistance Fj of several representative anchor rods and anchor cables, and records the pull-out force in the pull-out test, and calculates The ratio of the maximum working resistance Fj of a single anchor cable to the average value Fk of the pullout force of the group and the support efficiency coefficient η of the anchor cable can be used to calculate the support efficiency coefficient of a single anchor cable in the roadway anchor net cable system. Discretization in the support efficiency coefficient; evaluate the rationality of the roadway anchor net cable system according to the support efficiency coefficient η and dispersion. The invention provides a more scientific and reliable evaluation method for roadways supported by anchor net cables.

Description

technical field [0001] The invention relates to a quality evaluation method, in particular to a roadway anchor net cable system support effect evaluation method. Background technique [0002] In the roadway support, the anchor net cable support has been popularized and applied in many mines in my country because of its advantages of actively controlling the deformation of the surrounding rock, remarkable support effect, and convenient and quick construction. At present, roadways supported by anchor net cables account for more than 65% of all roadways in my country. Due to the complexity of geological mining conditions and the extensiveness of field tests, the design parameters of anchor net cable support are mainly based on empirical methods, and a conservative attitude is generally adopted. The designed support parameters are too large, and they would rather waste materials than cause damage to the roadway. The amount of deformation is too large, which leads to a large con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M99/00
CPCG01M99/008
Inventor 刘立民张进鹏闫旭曹君陟孙伟付彪李扬
Owner SHANDONG UNIV OF SCI & TECH
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