CN109611117B - Supporting method for mine in acid water environment - Google Patents
Supporting method for mine in acid water environment Download PDFInfo
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- CN109611117B CN109611117B CN201811368493.9A CN201811368493A CN109611117B CN 109611117 B CN109611117 B CN 109611117B CN 201811368493 A CN201811368493 A CN 201811368493A CN 109611117 B CN109611117 B CN 109611117B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000002253 acid Substances 0.000 title description 6
- 239000004567 concrete Substances 0.000 claims abstract description 76
- 230000007797 corrosion Effects 0.000 claims abstract description 27
- 238000005260 corrosion Methods 0.000 claims abstract description 27
- 239000010881 fly ash Substances 0.000 claims abstract description 14
- 239000011241 protective layer Substances 0.000 claims abstract description 12
- 230000002378 acidificating effect Effects 0.000 claims abstract description 10
- 239000011435 rock Substances 0.000 claims abstract description 7
- 238000012360 testing method Methods 0.000 claims description 16
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 7
- 239000008399 tap water Substances 0.000 claims description 5
- 235000020679 tap water Nutrition 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 3
- 239000011150 reinforced concrete Substances 0.000 claims description 3
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims description 2
- 238000004873 anchoring Methods 0.000 claims description 2
- 239000010410 layer Substances 0.000 claims 1
- 238000005065 mining Methods 0.000 abstract description 4
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 2
- 239000010883 coal ash Substances 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005842 biochemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 229910052569 sulfide mineral Inorganic materials 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Road Paving Structures (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention belongs to the technical field of mining, and particularly relates to a supporting method under mine acidic water environment, which is carried out according to the following steps: step 1: determining the addition amount of fly ash in the corrosion-resistant concrete; step 2: calculating the thickness of the concrete lining according to the maximum stress of surrounding rocks after the roadway is excavated; and step 3: determining the thickness of the minimum protective layer of the concrete; and 4, step 4: determining the thickness of a concrete support; and 5: the invention effectively prolongs the service life of the support body, saves the cost and provides technical support for safe production of mines by determining the support scheme.
Description
Technical Field
The invention belongs to the technical field of mining, and particularly relates to a supporting method for a mine in an acid water environment.
Background
The proportion of sulfide mineral deposits in metal mines in China is large, and the mines generally face the harm of acidic water. The mine acidic water is mine water with pH of less than 7, generally the pH is between 3.0 and 6.5, and the acid is stronger when the pH value is smaller. In the process of mining sulfide ore deposit, sulfide-containing ore undergoes a series of physicochemical and biochemical reactions such as weathering, leaching, oxidation and hydrolysis under the action of air, water and microorganisms to gradually form acidic water containing sulfate and metal ions. The water has strong corrosive destructiveness to underground metal material equipment, and has the problems of serious deformation, cracking and falling, short service life, high supporting cost and the like of reinforced concrete supporting bodies.
Disclosure of Invention
Aiming at the problems and the defects in the prior art, the invention provides a supporting method for a mine in an acid water environment.
In order to achieve the purpose, the invention provides the following technical scheme:
a supporting method under mine acidic water environment is carried out according to the following steps:
step 1: determining the addition amount of fly ash in the corrosion-resistant concrete, performing a corrosion-resistant concrete strength contrast test, testing the percentage of the fly ash addition amount in the total amount of the cementing material, and respectively testing the corrosion resistance under the dry-wet cycle accelerated corrosion condition and 28 days under the tap water condition;
step 2: calculating the thickness of the concrete lining according to the maximum stress of surrounding rocks after the roadway is excavated, wherein the calculation formula of the thickness of the concrete lining is as follows:
in the formula: h: lining thickness of concrete, m; r: equivalent circle radius, m; f. ofc: the design strength of concrete is MPa; v. ofk: the safety coefficient is in a value range of 1.5-2.4; p: maximum of earth pressure calculation, MPa;
and step 3: and determining the minimum protective layer thickness of the concrete, wherein the minimum protective layer thickness of the concrete refers to the distance from the outer edge of the outermost steel bar to the surface of the concrete and is not less than the nominal diameter D of the steel bar. The concrete structural member aims to meet the requirements of durability and effective anchoring of stressed steel bars;
and 4, step 4: determining the thickness of a concrete support, wherein the support thickness can be selected according to the regulation of non-ferrous metal mine roadway engineering design specifications (GB 50915-2013) when the roadway adopts cast concrete and concrete blocks to support integrally;
and 5: determining a supporting scheme, and determining to adopt an arc arch reinforced concrete supporting scheme according to the determined addition amount of the fly ash in the corrosion-resistant concrete, the concrete lining thickness, the concrete minimum protective layer thickness and the concrete supporting thickness parameters in combination with the stress condition of the mine surrounding rock.
Further, the strength contrast test of the corrosion-resistant concrete in the step 1 is a test on six groups of data of which the coal ash content accounts for 10%, 15%, 20%, 25%, 30% and 35% of the total weight of the cementing material.
Further, the pH value of the mine acidic water is 2.79-3.51.
Compared with the prior art, the invention has the beneficial effects that:
the invention adopts the method of adding the fly ash into the existing concrete support to carry out the corrosion-resistant concrete strength contrast test, six groups of data with the fly ash content accounting for 10%, 15%, 20%, 25%, 30% and 35% of the total amount of the cementing material are tested, the corrosion resistance under the dry-wet cycle accelerated erosion condition and the tap water condition is respectively tested, then the thickness of the concrete lining is determined, the minimum protective layer thickness of the concrete is determined, and the thickness of the concrete support is determined.
Drawings
Fig. 1 is a schematic view of a roadway support section structure adopting the invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
A supporting method under mine acidic water environment is carried out according to the following steps:
step 1: determining the addition amount of fly ash in the corrosion-resistant concrete, performing a strength contrast test on the corrosion-resistant concrete, and respectively testing the corrosion resistance under dry-wet cycle accelerated corrosion conditions and 28 days under tap water conditions;
step 2: calculating the thickness of the concrete lining according to the maximum stress of surrounding rocks after the roadway is excavated, wherein the calculation formula of the thickness of the concrete lining is as follows:
in the formula: h: lining thickness of concrete, m; r: equivalent circle radius, m; f. ofc: the design strength of concrete is MPa; v. ofk: the safety coefficient is in a value range of 1.5-2.4; p: maximum of earth pressure calculation, MPa;
and step 3: determining the thickness of the minimum protective layer of the concrete;
and 4, step 4: determining the thickness of a concrete support;
and 5: and determining a supporting scheme.
Example 1
Step 1: determining the addition amount of fly ash in the corrosion-resistant concrete
And (3) performing a corrosion resistance concrete strength contrast test, testing six groups of data of which the coal ash content accounts for 10%, 15%, 20%, 25%, 30% and 35% of the total weight of the cementing material, and respectively testing the corrosion resistance under dry-wet cycle accelerated corrosion conditions and 28 days under tap water conditions.
Finally, the following results are obtained: when the addition amount of the fly ash is 20%, the corrosion resistance of the concrete is optimal, and the corrosion resistance coefficient is 94.644%, so that the addition amount of the fly ash in the corrosion-resistant concrete is finally determined to be 20% of the weight of the cementing material;
step 2: determining concrete lining thickness
Calculating the thickness of the concrete lining according to the maximum stress of surrounding rocks after the roadway is excavated, wherein the calculation formula of the thickness of the concrete lining is as follows:
in the formula: h: lining thickness of concrete, m; r: equivalent circle radius, m; f. ofc: the design strength of concrete is MPa; v. ofk: the safety coefficient is in a value range of 1.5-2.4; p: maximum of earth pressure calculation, MPa.
According to the concrete strength regulation in the concrete structure design specification (GB 50010-2010) 2015 edition, the strength of C25 concrete is selected to be 16.7MPa, the strength of the C25 concrete in the calculation is 12.0MPa in consideration of the underground hydration process of the concrete, and the concrete is substituted into the lining thickness h =95mm calculated in the formula (1).
And step 3: determining the minimum protective layer thickness of concrete
The pH value of underground gushing water of deep mining companies is 2.79-3.51, and the underground gushing water belongs to a strong acid solution. According to the specification of corrosion prevention, the minimum thickness of the concrete protective layer of the concrete structure to the steel bar is defined as 35mm, and the minimum thickness of the concrete protective layer is shown in figure 1.
And 4, step 4: determining concrete support thickness
In order to ensure the safety, durability and corrosion resistance of the roadway supporting structure and simultaneously consider the influence of site construction factors on the strength of the supporting member, the roadway concrete is determined to be C25, the supporting thickness of the concrete is shown as the second figure in FIG. 1, and the thickness is determined to be 300 mm. If the tunnel top falls to a larger height in the field, the thickness of the tunnel support should be increased properly.
And 5: determining a supporting plan
(1) The section type of the roadway support is in a circular arch straight wall shape (without a bottom plate), the radius of a circular arc is 1333mm, and the figure is shown in the third step in figure 1; the height of the side wall is 2100mm, which is shown as ((r) in figure 1); the arch height is 820mm, see the fifth in figure 1; the net width of the roadway is 2460mm, which is shown as the sixth in figure 1; the base has a depth of 500mm, see (c) in fig. 1.
(2) Adopting a double-row distributed reinforcing mesh, wherein longitudinal bars are shown as the ((R) B400) reinforcing steel bars with the specification of 16mm, and the arrangement space is 230 multiplied by 250 mm; the lacing wire is shown as the ninthly, HPB300 steel bar with the specification of 6mm, and the row spacing is 250 mm.
(3) Supporting C25 concrete 300mm thick, see in (R) in FIG. 1.
(4) The roadway support section structure is shown in the following figure 1.
Claims (3)
1. A supporting method under mine acidic water environment is characterized by comprising the following steps:
step 1: determining the addition amount of fly ash in the corrosion-resistant concrete, performing a corrosion-resistant concrete strength contrast test, testing the percentage of the fly ash addition amount in the total amount of the cementing material, and respectively testing the corrosion resistance under the dry-wet cycle accelerated corrosion condition and 28 days under the tap water condition;
step 2: calculating the thickness of the concrete lining according to the maximum stress of surrounding rocks after the roadway is excavated, wherein the calculation formula of the thickness of the concrete lining is as follows:
in the formula: h: lining thickness of concrete, m; r: equivalent circle radius, m; fc: the design strength of concrete is MPa; vk: the safety coefficient is in a value range of 1.5-2.4; p: maximum of earth pressure calculation, MPa;
and step 3: determining the minimum protective layer thickness of the concrete, wherein the minimum protective layer thickness of the concrete refers to the distance from the outer edge of the steel bar at the outermost layer to the surface of the concrete and is not less than the nominal diameter D of the steel bar, and the aim is to ensure that the concrete structural member meets the requirements of durability and effective anchoring of the stressed steel bar;
and 4, step 4: determining the thickness of a concrete support, wherein the support thickness can be selected according to the regulation of non-ferrous metal mine roadway engineering design specifications (GB 50915-2013) when the roadway adopts cast concrete and concrete blocks to support integrally;
and 5: determining a supporting scheme, and determining to adopt an arc arch reinforced concrete supporting scheme according to the determined addition amount of the fly ash in the corrosion-resistant concrete, the concrete lining thickness, the concrete minimum protective layer thickness and the concrete supporting thickness parameters in combination with the stress condition of the mine surrounding rock.
2. The method for supporting in the acidic water environment of the mine as claimed in claim 1, wherein the strength contrast test of the corrosion-resistant concrete in step 1 is a test of six groups of data of 10%, 15%, 20%, 25%, 30% and 35% of the fly ash content in the total amount of the cementing material.
3. The method as claimed in claim 1, wherein the pH of the mine acidic water is 2.79-3.51.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811368493.9A CN109611117B (en) | 2018-11-16 | 2018-11-16 | Supporting method for mine in acid water environment |
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| CN201811368493.9A CN109611117B (en) | 2018-11-16 | 2018-11-16 | Supporting method for mine in acid water environment |
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| CN109611117B true CN109611117B (en) | 2020-08-25 |
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| CN110987771B (en) * | 2019-10-29 | 2022-07-19 | 交通运输部公路科学研究所 | Test method for simulating interface concrete corrosion between tunnel lining structure and surrounding rock |
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| CN1115447C (en) * | 2002-06-10 | 2003-07-23 | 王衡 | Anchor-spraying concrete for treating water and support |
| CN105089680B (en) * | 2015-04-14 | 2018-03-06 | 山东科技大学 | A kind of gob side entry retaining light high strength concrete blockwork and its construction technology |
| CN106761851B (en) * | 2017-01-10 | 2018-08-17 | 西南交通大学 | A kind of tunnel water proofing subregion construction and its implementation using spraying waterproof technique |
| CN107605494B (en) * | 2017-11-06 | 2019-06-28 | 招金矿业股份有限公司蚕庄金矿 | A kind of crushed zone soft-rock tunnel advance support technology |
| CN108286447A (en) * | 2018-01-19 | 2018-07-17 | 中国铁道科学研究院铁道建筑研究所 | A kind of self-adhesive pad formula waterproof roll paving hanging method |
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