CN103122768B - Supporting method of carboniferous system geologic structure in-zone breaking country rock roadway - Google Patents
Supporting method of carboniferous system geologic structure in-zone breaking country rock roadway Download PDFInfo
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- CN103122768B CN103122768B CN201110369511.7A CN201110369511A CN103122768B CN 103122768 B CN103122768 B CN 103122768B CN 201110369511 A CN201110369511 A CN 201110369511A CN 103122768 B CN103122768 B CN 103122768B
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Abstract
The invention particularly discloses a supporting method of a carboniferous system geologic structure in-zone breaking country rock roadway. The problems of that support of the carboniferous system geologic structure in-zone breaking country rock roadway is incomplete is solved. According to the supporting method of the carboniferous system geologic structure in-zone breaking country rock roadway, temporary support to a roadway is carried out when a heading machine group is stepped forward and cut to a certain distance, and then permanent support composed of two steps is carried out. The permanent support comprises that a steel wire mesh is laid, girders are loaded up, roof bolts are installed, gang-part bolts are installed, and roof anchor ropes are installed. The supporting method of the carboniferous system geologic structure in-zone breaking country rock roadway is capable of lightening digging subsidiary transport work amount and improving a safety factor inside the roadway and has high economic effectiveness.
Description
Technical field
The present invention relates to the supporting method in tunnel, be specially the supporting method in breaking surrounding rock tunnel in a kind of Carboniferous System geological structural belt.
Background technology
The Carboniferous Period is important coal-forming period the earliest in the whole world.The period Carboniferous Period, the stratum of deposition was called the Carboniferous System.The Carboniferous Period is early stage, and southern china, owing to moving back when entering during seawater, forms extra large land and replaces phase, deposited the clastic of about 1000 meters, holmite and coal seam; To the late Carboniferous epoch, seawater is more stable, deposits based on shallow-sea facies limestone.After the Ordovician period, seawater exits whole North China and THE SOUTH OF NORTHEAST CHINA area, suffers weathering and erosion for a long time, until during the late Carboniferous epoch, seawater is just invaded again and is overflow to this area, and form the coal-bearing deposit that the extra large land being generally no more than 500 meters replaces phase, contained fauna is similar to south China.Northern-Northeast China district (C1)Culm take marine clastics as main folder limestone, time folder terrestrial facies detrital deposit, thickness is larger; Upper Carboniferous series is based on marine limestone, and contained fauna is similar to south China.The Carboniferous System more complicated of northwest, thickness is large, and contained fauna is similar to south China.The Carboniferous System deposit thickness in Qinghai-Tibet district is comparatively large, and also containing volcanic series, contained fauna is similar to south China.Have at In South China and survey water section, temple gate segment and the Longevity Hill section; Have Benxi group and Taiyuan Forma-tion in North China, Taiyuan Forma-tion is most important coal measure strata in the NORTH CHINA Carboniferous System, is distributed widely in the areas such as North China, THE SOUTH OF NORTHEAST CHINA and northwest.Other deposition mineral products have iron, manganese, pyrite, bauxite and gypsum.
Adopt bolt support for Taiyuan seam group exploitation at present more.Bolt support can significantly improve the stability of country rock, has obvious technology and superiority in economy compared with traditional shed ding support, and thus extremely countries in the world geotechnical engineering circle paid close attention to, and is rapidly developed and extensive use.At present, bolt support has become a main development direction of roadway support.But bolt support technology also exists many problems, anchor rod supporting theory is imperfect yet, and particularly the support reinforcement problem in the hard situation such as big cross section, weak broken wall rock tunnel does not also solve completely.
Summary of the invention
The present invention, in order to the incomplete problem of supporting solving breaking surrounding rock tunnel in Carboniferous System geological structural belt, provides the supporting method in breaking surrounding rock tunnel in a kind of Carboniferous System geological structural belt.
The present invention adopts following technical scheme to realize: the supporting method in breaking surrounding rock tunnel in Carboniferous System geological structural belt, by driving unit forward cut to during certain distance, temporary lining is carried out to tunnel, then permanent support two step compositions are carried out, it is characterized in that: temporary lining step comprises, arrange nearest from work plane two and respectively on the good top anchor pole of supporting fix " U " type suspension ring, channel-section steel is utilized to penetrate " U " type suspension ring of former and later two top anchor poles as forestope, the timber plate girder of fixed level between forestope, release and carry out temporary lining with the forestope group of timber plate girder, the step of permanent support comprises, and lays gauze wire cloth, upper girder steel, installs roofbolt, installs side portion's anchor pole, installs top board anchor cable, anchor rod anchored form adopts full length fastening or the extensible bolting form, rock-bolt length must be greater than the maximum loosening degree of depth of country rock, and roofbolt length selects 2.4m, and side portion's rock-bolt length selects 2.2m, need during rockbolt installation to add pretightning force, the pretightning force along the anchor pole in tunnel end face and side facet normal direction is 55 ~ 57KN, and the bolt pretension near drift angle and base angle is 59 ~ 61KN, bolt diameter selects 22mm, anchor pole Material selec-tion II grade of left-handed nothing of 20MnSi indulges muscle screw-thread steel, anchor spacing is chosen as 0.7 ~ 0.9m, and array pitch is chosen as 0.9 ~ 1.1m, bore diameter 6 ~ 10mm larger than bolt diameter, diameter 3 ~ the 6mm less of bore diameter of resin explosive roll, anchor cable selects 7 strands of diameters to be the high strength steel strand composition of 5mm, and the array pitch determination anchor cable array pitch according to anchor pole is 0.9 ~ 1.1m, and anchor cable adopts the anchoring of end anchorage mode, and the pretightning force that anchor cable is installed is determined according to bolt pretension, is not less than 100KN, select 4mm iron wire establishment diamond mesh.The selection of rock-bolt length guarantees that length is greater than the maximum loosening degree of depth of country rock, considers cost factor while ensureing safety; The pretightning force that during rockbolt installation, needs add is according to the span in tunnel and highly determine, ensures that supporting is safe and effective; Bolt diameter be chosen as size larger in array of sizes, guaranteed strength; The selection of anchor pole material ensure that the requirement of pretightning force; The selection of anchor spacing and array pitch considers cost and construction experience when ensureing supporting effect; Select wire lath flexible, intensity is high, hole shape is constant, easy to connect, be applicable to this supporting.During work, at the work plane in existing permanent support front, use development machine driving, driving certain distance, just take temporary lining, temporary lining is complete, and personnel can work under temporary lining, and the installation completing the permanent support designed is fixed.
Beneficial effect of the present invention is as follows:
Economic benefit of the present invention:
This expense 244.8 yuan/m in bolt support 5102 tunnel, this expense in shed shoring tunnel is 430 yuan/m, and the two total cost compares, and roadway supported by bolt can reduce expenditure 686.89 yuan/m, saves 33.89% than shed shoring.Bolt support effectively controls deformation of the surrounding rock in tunnel, and tunnel only needs a small amount of maintenance just can meet production requirement in the later stage; Although shed shoring also can realize the control to improving stability of surrounding rocks in roadway, but supporting construction labour intensity is large, and owing to being passive protecting, relatively poor to deformation of the surrounding rock in tunnel control effects, more material resources, manpower and time can be dropped into because increasing the intensity of advance support during the advance of the face, that adds necessity removes canopy feed back operation, can impact face propulsion speed and then reduce back production effect.Adopt the tunnel of bolt support, face end and advance support can be simplified, cancel and remove canopy feed back operation, shorten coal-winning machine termination and return the cutter time, according to experience measuring and calculating, effective Homes Using TV of coal-winning machine 22% can be improved.
Social benefit of the present invention:
1. tunnel assistant conveyance workload significantly to alleviate.
Compared with shed shoring, assistant conveyance workload during adopting bolt support to considerably reduce tunnelling, the steel carrying amount that km tunnel is reduced more than 300 tons, reduce mine timber carrying about amount 50m3, when solving coal roadway tunneling assistant conveyance workload large, take manually how and assistant conveyance do not catch up with and affect the problem of normal construction.
2. improve the reliable degree in tunnel
The integral fastening structure that the initiative effects of bolt support and applying pretightning force are formed, effectively can prevent the generation of tunneling roof fall accident; The roadway deformation of bolt support is relatively little, and tunnel useful area is large, is conducive to the safety of ventilation, pedestrian, transport.
3. improve the Roadway Support Technology level of mining listed corporations
In the past when running into complex geological condition, the more it is envisioned that shed shorings of enterprise technology personnel, dare not adopt bolt support.Use of the present invention significantly enhances the confidence that enterprise engineering technician uses bolt anchorage roadway surrounding rock under complex geological condition, has had new understanding to bolt support technology.Project achievement in research enhances the design concept of the Bolting Parameters of enterprise engineering technician, serves facilitation to the raising of enterprise's Roadway Support Technology level.
Detailed description of the invention
The supporting method in breaking surrounding rock tunnel in Carboniferous System geological structural belt, by driving unit forward cut to during certain distance, temporary lining is carried out to tunnel, then permanent support two step compositions are carried out, it is characterized in that: temporary lining step comprises, arrange nearest from work plane two and respectively on the good top anchor pole of supporting fix " U " type suspension ring, channel-section steel is utilized to penetrate " U " type suspension ring of former and later two top anchor poles as forestope, the timber plate girder of fixed level between forestope, the forestope group released with timber plate girder carries out temporary lining; The step of permanent support comprises, and lays gauze wire cloth, upper girder steel, installs roofbolt, installs side portion's anchor pole, installs top board anchor cable; Anchor rod anchored form adopts full length fastening or the extensible bolting form; Rock-bolt length must be greater than the maximum loosening degree of depth of country rock, and roofbolt length selects 2.4m, and side portion's rock-bolt length selects 2.2m; Need during rockbolt installation to add pretightning force, the pretightning force along the anchor pole in tunnel end face and side facet normal direction is 55 ~ 57KN, and the bolt pretension near drift angle and base angle is 59 ~ 61KN; Bolt diameter selects 22mm; Anchor pole Material selec-tion II grade of left-handed nothing of 20MnSi indulges muscle screw-thread steel; Anchor spacing is chosen as 0.7 ~ 0.9m, and array pitch is chosen as 0.9 ~ 1.1m; Bore diameter 6 ~ 10mm larger than bolt diameter; Diameter 3 ~ the 6mm less of bore diameter of resin explosive roll; Anchor cable selects 7 strands of diameters to be the high strength steel strand composition of 5mm, and the array pitch determination anchor cable array pitch according to anchor pole is 0.9 ~ 1.1m, and anchor cable adopts the anchoring of end anchorage mode, and the pretightning force that anchor cable is installed is determined according to bolt pretension, is not less than 100KN; Select 4mm iron wire establishment diamond mesh.
The step of installing roofbolt and installation side portion's anchor pole is first install roofbolt, carry out, and then install side portion's anchor pole according to from outside to inside, by the order of centre to both sides.
Claims (2)
1. the supporting method in breaking surrounding rock tunnel in a Carboniferous System geological structural belt, by driving unit forward cut to during certain distance, temporary lining is carried out to tunnel, then permanent support two step compositions are carried out, it is characterized in that: temporary lining step comprises, arrange nearest from work plane two and respectively on the good top anchor pole of supporting fix " U " type suspension ring, channel-section steel is utilized to penetrate " U " type suspension ring of former and later two top anchor poles as forestope, the timber plate girder of fixed level between forestope, the forestope group released with timber plate girder carries out temporary lining; The step of permanent support comprises, and lays gauze wire cloth, upper girder steel, installs roofbolt, installs side portion's anchor pole, installs top board anchor cable; Anchor rod anchored form adopts full length fastening or the extensible bolting form; Rock-bolt length must be greater than the maximum loosening degree of depth of country rock, and roofbolt length selects 2.4m, and side portion's rock-bolt length selects 2.2m; Need during rockbolt installation to add pretightning force, the pretightning force along the anchor pole in tunnel end face and side facet normal direction is 55 ~ 57KN, and the bolt pretension near drift angle and base angle is 59 ~ 61KN; Bolt diameter selects 22mm; Anchor pole Material selec-tion II grade of left-handed nothing of 20MnSi indulges muscle screw-thread steel; Anchor spacing is chosen as 0.7 ~ 0.9m, and array pitch is chosen as 0.9 ~ 1.1m; Bore diameter 6 ~ 10mm larger than bolt diameter; Diameter 3 ~ the 6mm less of bore diameter of resin explosive roll; Anchor cable selects 7 strands of diameters to be the high strength steel strand composition of 5mm, and the array pitch determination anchor cable array pitch according to anchor pole is 0.9 ~ 1.1m, and anchor cable adopts the anchoring of end anchorage mode, and the pretightning force that anchor cable is installed is determined according to bolt pretension, is not less than 100KN; Select 4mm iron wire establishment diamond mesh.
2. the supporting method in breaking surrounding rock tunnel in Carboniferous System geological structural belt according to claim 1, it is characterized in that: the step of installing roofbolt and installation side portion's anchor pole is, first roofbolt is installed, carry out according to from outside to inside, by the order of centre to both sides, and then side portion's anchor pole is installed.
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| CN201110369511.7A CN103122768B (en) | 2011-11-21 | 2011-11-21 | Supporting method of carboniferous system geologic structure in-zone breaking country rock roadway |
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| CN201110369511.7A CN103122768B (en) | 2011-11-21 | 2011-11-21 | Supporting method of carboniferous system geologic structure in-zone breaking country rock roadway |
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| CN103122768B true CN103122768B (en) | 2015-06-24 |
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| CN104453957B (en) * | 2014-11-15 | 2016-08-24 | 大同煤矿集团有限责任公司 | Medium-thickness seam roof rock control method |
| CN111779509A (en) * | 2020-07-10 | 2020-10-16 | 山西新景矿煤业有限责任公司 | Construction and support method for secondary roadway formation by cutting holes in small-interval intervals under goaf |
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Non-Patent Citations (4)
| Title |
|---|
| 深部全煤巷道锚网耦合支护技术应用研究;刘文涛等;《采矿与安全工程学报》;20060930;第23卷(第3期);第272-276页 * |
| 特厚煤层超高煤帮大断面巷道支护技术;李燕飞;《中国煤炭工业》;20110430(第4期);第48-49页 * |
| 石炭二叠纪松散围岩巷道锚网索;胡守平;《中国西部科技》;20081231;第07卷(第36期);全文 * |
| 许厂煤矿松碎不稳定围岩巷道锚网索支护技术;万志军等;《采矿与安全工程学报》;20071231;第24卷(第4期);全文 * |
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