CN104452783A - Layered repeated high-pressure grouting prestress anchoring technology for high and steep slope of strip mine - Google Patents
Layered repeated high-pressure grouting prestress anchoring technology for high and steep slope of strip mine Download PDFInfo
- Publication number
- CN104452783A CN104452783A CN201410648747.8A CN201410648747A CN104452783A CN 104452783 A CN104452783 A CN 104452783A CN 201410648747 A CN201410648747 A CN 201410648747A CN 104452783 A CN104452783 A CN 104452783A
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- Prior art keywords
- slip casting
- pressure
- grouting
- carried out
- layered
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0023—Cast, i.e. in situ or in a mold or other formwork
Abstract
The invention provides a layered repeated high-pressure grouting prestress anchoring technology for a high and steep slope of a strip mine. Based on testing and monitoring results of the granularity, the stress and the displacement of fractured rock masses of the high and steep slope of the strip mine, the technological parameters of layered repeated high-pressure grouting are determined through a theory analysis and numerical simulation method. The technological parameters comprise storey height, the number of times of grouting, grouting pressure and the like. Effective pressure of the anchoring technology is kept for a long time. The technological parameters are combined with site monitoring results obtained after anchoring, the grouting and anchoring technological parameters can be adjusted in time. The layered repeated high-pressure grouting prestress anchoring technology has the advantages that the construction technological parameters and construction requirements of layered repeated high-pressure grouting can be reasonably designed according to the characteristics of high and steep slopes of different strip mines, the high and steep slope of the strip mine can be kept stable for a long time, and safe production is guaranteed.
Description
Technical field
The invention belongs to opencut high gradient slope unstability Disaster control technical field, be specifically related to adopt layering repeatedly high-pressure slip-casting prestressed anchorage technology prevent open-pit slope disaster accident.
Background technology
Open-pit slope unstability will cause serious disasters and accidents, usually adopt effective supporting to strengthen the stability of side slope.The supporting method of side slope is a lot, as antislide pile, barricade, anchor pole and anchor cable etc., wherein because anchor shaft anchor cable can embody the concept of active support, therefore obtains and payes attention to widely.China is bolt support on probation from 1956, and four during the last ten years by a large amount of experiments and on-the-spot application, and oneself through making great progress in the mechanism of action and engineer applied.
In prestressed anchor reinforcement rock side slope, carried out a large amount of research work in recent years, technology reaches its maturity, and obtains some application in the engineering construction of highway, railway etc.But in Application in mining field, prestress anchorage cable tonnage is generally no more than 1000kN, and length is generally no more than 30m, the anchoring engineering for In A Crushed Rock Slope often selects the anchor cable of little tonnage.Prestress anchorage cable reasonable structure form and size are the key factors determining consolidation effect and cost.At present, the anchor mechanism of the outer anchor structure of, In A Crushed Rock Slope steep for height and less to the influence research of engineering design thereof, and also in construction and use procedure, how effectively long-term maintenance anchorage effect is not also resolved.Therefore, need to further investigate the prestressed anchorage technology of high gradient slope, grasp the mechanism of anchorage effect, the Changing Pattern of prestressd anchor cable, thus guarantee the long-term stability of rock mass, reduce the harmful effect that loss of prestress brings to the long-term safety of consolidation effect and side slope.
Summary of the invention
Stable in order to what overcome that existing anchoring can not keep opencut high gradient slope stable cost-effectively for a long time, propose layering repeatedly high pressure jet grouting prestressed anchorage technology, can according to the feature of opencut high gradient slope fragmented rock body, layering, repeatedly, high pressure jet grouting, keep the long-term stability of side slope.
Technical scheme of the present invention is: a kind of opencut high gradient slope layering repeatedly high-pressure slip-casting prestressed anchor solid method, comprises the following steps:
A) anchor pole assembled is imbedded boring, carry out first time slip casting;
B) after first time slip casting 17-18h, second time slip casting is carried out in comparatively depths;
C) after second time slip casting initial set, third time slip casting is carried out;
D) after third time slip casting final set, the 4th slip casting is carried out;
Further, described first step slip casting is carried out at hole depth 6-7 rice, and grouting pressure is 0.1-0.2MPa, and slurries use C42.5 Portland cement single-blade, and water/binder ratio is 0.5:1, after the slurries spill-over of aperture to be drilled place, namely stops slip casting;
Further, described second step slip casting is carried out at hole depth 9-10 rice, and grouting pressure is 1MPa;
Further, described 3rd step slip casting is carried out at hole depth 1-2 rice, and grouting pressure is 1Mpa ~ 1.2Mpa;
Further, described 4th slip casting is carried out at hole depth 4-5 rice, and grouting pressure is 4MPa.
By test and the monitoring result of the granularity to opencut high gradient slope fragmented rock body, stress, displacement, adopt theory analysis and the method determination layering of numerical simulation, the technological parameter of repeatedly slip casting, comprise floor height, slip casting number of times, grouting pressure etc., keep the long-term maintenance of anchoring effective pressure.In conjunction with the field monitoring result that anchoring is later, can adjust slip casting anchoring technological parameter in time.
Accompanying drawing explanation
Fig. 1 is present invention process schematic diagram.
Specific embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is explained in further detail.Should be appreciated that specific embodiment described herein only for explaining the present invention, being not intended to limit the present invention.
On the contrary, the present invention is contained any by the substituting of making on marrow of the present invention and scope of defining of claim, amendment, equivalent method and scheme.Further, in order to make the public have a better understanding to the present invention, in hereafter details of the present invention being described, detailedly describe some specific detail sections.Do not have the description of these detail sections can understand the present invention completely for a person skilled in the art yet.
The invention provides a kind of opencut high gradient slope layering repeatedly high pressure injection oar prestressed anchor solid method, described method specifically comprises the following steps:
The first step, first in the open ore deposit high gradient slope is holed, and after having holed, the anchor pole assembled is imbedded boring, first time slip casting is carried out at hole depth 6-7 rice, first time slip casting adopts conventional slip casting, and grouting pressure is 0.1-0.2MPa, and slurries use C42.5 Portland cement single-blade, water/binder ratio is 0.5:1, after the slurries spill-over of aperture to be drilled place, namely stop slip casting, and common pressure grouting pipe is extracted out;
Second step, after first time conventional slip casting 17-18h, after being conventional slip casting final set, in the slip casting of 9-10 place meter Jin Hang second time, this time slip casting is slip casing by pressure, and pressure is 1MPa, observing side slope surrounding rock body during slip casting with or without running pulp phenomenon, as being found, stopping slip casting immediately;
3rd step, after second time slip casting initial set, namely starts third time slip casting, grouting pressure 1Mpa ~ 1.2Mpa at hole depth 1-2 rice, observing side slope surrounding rock body with or without running pulp phenomenon, as being found, stopping slip casting immediately during slurry;
4th step, after the slip casting final set of upper third time, carries out the 4th slip casting at hole depth 4-5 rice, this time slip casting is high-pressure slip-casting (4MPa).During as surrounding rock body appearance distortion, running pulp phenomenon, stop slip casting immediately.
Advantageous Effects of the present invention is, by layering repeatedly slip casting, and by adjusting different grouting pressures, effectively can control anchor head addendum modification in 0.1%, simultaneously under the different pressures slip casting at diverse location place, form stable anchorage, avoid pull bar long-term stressed under creep, relaxation problem.
Claims (5)
1. an opencut high gradient slope layering repeatedly high-pressure slip-casting prestressed anchor solid method, is characterized in that, comprise the following steps:
A) anchor pole assembled is imbedded boring, carry out first time slip casting;
B) after first time slip casting 17-18h, second time slip casting is carried out in comparatively depths;
C) after second time slip casting initial set, third time slip casting is carried out;
D) after third time slip casting final set, the 4th slip casting is carried out.
2. method according to claim 1, is characterized in that, described first step slip casting is carried out at hole depth 6-7 rice, grouting pressure is 0.1-0.2MPa, and slurries use C42.5 Portland cement single-blade, and water/binder ratio is 0.5:1, after the slurries spill-over of aperture to be drilled place, namely stop slip casting.
3. method according to claim 1, is characterized in that, described second step slip casting is carried out at hole depth 9-10 rice, and grouting pressure is 1MPa.
4. method according to claim 1, is characterized in that, described 3rd step slip casting is carried out at hole depth 1-2 rice, and grouting pressure is 1Mpa ~ 1.2Mpa.
5. method according to claim 1, is characterized in that, described 4th slip casting is carried out at hole depth 4-5 rice, and grouting pressure is 4MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410648747.8A CN104452783A (en) | 2014-11-14 | 2014-11-14 | Layered repeated high-pressure grouting prestress anchoring technology for high and steep slope of strip mine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410648747.8A CN104452783A (en) | 2014-11-14 | 2014-11-14 | Layered repeated high-pressure grouting prestress anchoring technology for high and steep slope of strip mine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104452783A true CN104452783A (en) | 2015-03-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410648747.8A Pending CN104452783A (en) | 2014-11-14 | 2014-11-14 | Layered repeated high-pressure grouting prestress anchoring technology for high and steep slope of strip mine |
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| CN (1) | CN104452783A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107882040A (en) * | 2017-11-23 | 2018-04-06 | 北京地矿工程建设有限责任公司 | A kind of construction method of foundation ditch prestress anchorage cable |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1331366A (en) * | 2000-06-28 | 2002-01-16 | 刘正刚 | High-pressure grouting technique for stiffening slope of anchor cable (rod) system |
| CN102051879A (en) * | 2010-11-09 | 2011-05-11 | 中国水电顾问集团华东勘测设计研究院 | Process for constructing soil anchor |
| KR101038757B1 (en) * | 2010-10-14 | 2011-06-03 | 신성종합건축사사무소(주) | Pretension soil nail structure with steel pipe, and construction method thereof |
| KR20130113563A (en) * | 2012-04-06 | 2013-10-16 | 주식회사 삼우기초기술 | Compression and distribution type permanent anchor being able to replace the tension member of the free length range |
| CN103410161A (en) * | 2013-08-28 | 2013-11-27 | 张玉芳 | Slant grouting control steel anchor pipe frame and construction method thereof |
-
2014
- 2014-11-14 CN CN201410648747.8A patent/CN104452783A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1331366A (en) * | 2000-06-28 | 2002-01-16 | 刘正刚 | High-pressure grouting technique for stiffening slope of anchor cable (rod) system |
| KR101038757B1 (en) * | 2010-10-14 | 2011-06-03 | 신성종합건축사사무소(주) | Pretension soil nail structure with steel pipe, and construction method thereof |
| CN102051879A (en) * | 2010-11-09 | 2011-05-11 | 中国水电顾问集团华东勘测设计研究院 | Process for constructing soil anchor |
| KR20130113563A (en) * | 2012-04-06 | 2013-10-16 | 주식회사 삼우기초기술 | Compression and distribution type permanent anchor being able to replace the tension member of the free length range |
| CN103410161A (en) * | 2013-08-28 | 2013-11-27 | 张玉芳 | Slant grouting control steel anchor pipe frame and construction method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 谢振华等: "露天矿高陡边坡滑坡治理技术", 《采矿工程》 * |
| 郭建新: "分层多次高压注浆预应力锚固技术机理和应用", 《路基工程》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107882040A (en) * | 2017-11-23 | 2018-04-06 | 北京地矿工程建设有限责任公司 | A kind of construction method of foundation ditch prestress anchorage cable |
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| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
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Application publication date: 20150325 |