CN105822306A - Chamber structure design method of steeply inclined large and thick ore body multi-span structural system - Google Patents
Chamber structure design method of steeply inclined large and thick ore body multi-span structural system Download PDFInfo
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Abstract
The invention discloses a chamber structure design method of a steeply inclined large and thick ore body multi-span structural system.A chamber is divided into a plurality of indeterminate three-hinged arch structural units according to the first step and the second step, and each structural unit is composed of three second-step chamber jambs and two first-step chamber mined areas.The method comprises the steps that 1, the actual physical and mechanical properties of ore rock are calculated according to the following formula set (I), formula (II) and formula set (III); 2, the value alpha 1, the value alpha 2 and the value alpha 3 under different kinds of jamb structural units are calculated according to the formula set (I), the actually designed value alpha is selected between two smallest values of the three calculated values, the actually designed value alpha is substituted into the formula (II), and the design ratio of the first-step chamber width to the second-step chamber width can be obtained; 3, the mining level heights hcr1, hcr2 and hcr3 under different kinds of jamb structural units are calculated according to the formula set (III), and the actually designed hcr should be equal to or smaller than the smallest value among the three calculated values.According to the method, the chamber structural parameters are reasonably designed.
Description
Technical field
The invention belongs to the technical field of sub-terrain mines multiple step format mining with stowing, a kind of inclined thick gulf is even across the mineral building construction design method of structural system.
Background technology
Nowadays industrialization is rapidly built, the demand of ore resource is continued to increase by human development, along with easily adopting the depleted of ore resource, the underground mineral such as more target diversion deep, complicated difficult are adopted, simultaneously in order to realize resource high-efficiency, green, energy-conservation exploitation, the ultra-large recent studies on direction just becoming Mineral Engineering with ultradeep well ore body development of resources.For double super ore body resource development projects, open stope afterwards filling mining technique has obtained further application, and mineral building physical dimension progressively strengthens, and the stage constantly increases.The potential safety hazard brought by the Ground pressure activity and self structure unstability of avoiding down-hole extensive substep filling mining, optimize big thick ore body panel mineral building stopping sequence, it is accomplished by creating a set of new comprehensive calculation method to be analyzed, and whole mineral building structural system is carried out comprehensive calculating consideration as a bearing system.
Summary of the invention
The technical problem to be solved in the present invention is to provide the inclined thick gulf of a kind of reasonable in design even across the mineral building construction design method of structural system.
For solving above-mentioned technical problem, the technical solution used in the present invention is: be divided into several indeterminate three-hinged arch construction units according to one, two step mineral buildings, has 3 two step mineral building ore pillars and 2 step mineral building dead zones to constitute in each construction unit；
(1) calculate by following formula group (I), public formula II and formula group (III) according to ore deposit rock actual physics mechanical property；
L=α b (II)
In formula:
L is a step mineral building width, m；
B is two step mineral building width, m；
α is a step mineral building width and the coefficient of relationship of two step mineral building width；
For internal friction angle, °；
C is cohesive strength, MPa；
Hcr is level interval, m；
E is the elastic modelling quantity of ore deposit rock mass, GPa；
The evenly load value of mining room overlying rock effect, KN/m headed by q2；
In footnote 1,2,3 represent the first kind, Equations of The Second Kind and the 3rd class respectively；Wherein, two ore pillars of upper lower burrs side are the first kind, and two ore pillars of next-door neighbour upper lower burrs side ore pillar are Equations of The Second Kind, and the ore pillar in the middle of remaining is the 3rd class；
(2) α under inhomogeneity ore pillar construction unit is calculated according to formula group (I)1、α2And α3Value, the α value of actual design is the minima in above three value of calculation, the α value of actual design substitutes into public formula II, i.e. can get a step mineral building width and the design proportioning of two step mineral building width；
(3) level interval h under inhomogeneity ore pillar construction unit is calculated according to formula group (III)cr1、hcr2And hcr3, the h of actual designcrShould be equal to or less than the minima of above three value of calculation.
The width span of a step mineral building of the present invention and two step mineral buildings is 16m～24m.
Use and have the beneficial effects that produced by technique scheme: the present invention relies on the three classes indeterminate three-hinged arch construction unit formed when laying mineral building under big thick ore body, by redundant structure cell cube, even across bearing system, additional force system introduces in the calculating of big structural parameters, by setting up the indeterminate company of mineral building structural system across mechanical model, utilize the deformation relationship and critical strain condition supported between rod member, dissect the carrying effect of structural system in detail, use mole Coulomb block effect and limit equilibrium theory, calculate the mineral building span in the case of three classes and level interval, appropriate design mineral building structural parameters, analyze the stability of three class ore pillar construction units, and the stopping sequence of mineral building in preliminary assessment big thick ore body panel.The present invention is to multiple step format filling mining mineral building structure, pass through geometrical relationship, set up indeterminate company across structure mechanical model, thus obtain the Rational structure parameter of multiple step format mineral building, and according to the stability of the analysis result dissimilar construction unit of judge in the case of three classes, stopping sequence is carried out preliminary assessment.
Accompanying drawing explanation
The present invention is further detailed explanation with detailed description of the invention below in conjunction with the accompanying drawings.
Fig. 1 is to connect across structural representation before the present invention one step mineral building is exploited；
Fig. 2 is to connect across structural representation after the present invention one step mineral building is exploited；
Fig. 3 is that the present invention is even across construction unit force analysis figure；
Fig. 4 is the present invention indeterminate force diagram of three-hinged arch even under construction unit evenly load；
Fig. 5 is the present invention even indeterminate force diagram of three-hinged arch under construction unit additional force effect；
Fig. 6 is indeterminate rod member Stability Analysis of Compressed Column figure in the present invention.
Detailed description of the invention
It has been investigated that, for the high-dipping pole big thick ore body (general inclination angle >=55 °, thickness is at 100m～200m horizontal breadth) of ultra-largeization, underground head adopts buried depth 300～about 400m；Such ore body mineral building length direction is consistent with orebody trend, and in nugget, the exploitation of multiple step format interval taked by mineral building, and the width of a step and two step mineral buildings is between 16m～24m, and mineral building length is generally 50m～60m, and level interval is generally 50m～100m；Using moat ditch formula polycrystalline substance bottom mineral building, rock drilling is arranged horizontally in mineral building top, carries out side blasting broken ore or VCR FAXIA to broken ore to vertical long hole under cutting.In multiple step format recovery process, two step mineral buildings safeguard the stability of whole block structure system as supporting construction, the internal step mineral building top board of nugget, two step mineral building columns form the indeterminate bearing system of linkage, and top board ore deposit rock mass, column ore body, upper lower burrs rock mass then constitute the external and internal compositions factor of this system.When, after a step mineral building ore body avalanche back production, even becoming the stability key factor of nugget system across indeterminate Bracing Systems.According to mineral building Stope roof and the deformation at ore pillar top and stress observation, there is plastic hinge region, it was demonstrated that supporting construction is to three-hinged arch shape structural bearing mode development.
Finding, in this structural system, every 3 two step mineral buildings and 2 step mineral buildings can form an analytic unit body simultaneously, carry out unit redundant structure calculating, are then overlapped unit additional external force adjacent for cell cube calculating.The arch of the three-hinged arch shape structure of each unit loses be approximately equal to three-hinged arch structure half across value.And then utilize mole Coulomb block effect and limit equilibrium theory, the mineral building values of the structural parameters (mineral building width) that compromise between security calculates, determines under three class ore pillar construction unit situations.And stability and the preliminary assessment mineral building stopping sequence in panel of three class formation unit is analyzed according to result of calculation.
It addition, be analyzed from space geometry, two step mineral buildings are considered into support ore pillar member system (one end fix, one end hinged), by the impact on two step mineral building member system stability of the vertical force system, computational analysis mineral building level interval parameter value.
Mineral building construction unit stability analysis, and the stopping sequence that preliminary assessment mineral building is in panel is carried out according to α value in result of calculation.
Mineral building back production at the emerging iron mine in Si Jiaying field is studied and is shown, this inclined thick gulf is even applicable to the extremely thick ore body of high-dipping across the mineral building construction design method of structural system, the slanting angle of ore body >=55 °, horizontal breadth 100m～200m, covering layer should be at >=300m, the width of one step and two step mineral buildings is 16m～24m, and mineral building length is generally 50m～60m, and mineral building height is >=50m～100m.
Fig. 1, Fig. 2 are to connect across structure chart before and after the substep exploitation of high-dipping pole big thick ore body one, two step mineral building, Fig. 1 for before for exploitation, Fig. 2 be form stope after a step mineral building back production, two step mineral buildings do the company of ore pillar across structure chart.After Fig. 3-5 is a step mineral building back production, the company being made up of 3 two step mineral building ore pillars and 2 step mineral building goafs is across construction unit (Fig. 3), and the indeterminate force diagram of three-hinged arch (Fig. 5) under the indeterminate force diagram of three-hinged arch (Fig. 4) under corresponding evenly load q and additional force effect.A, B, C are hinge, A, B 2 are mineral building midpoint, C point connects an adjacent mined out step mineral building drilling chamber top board summit for A, B 2 and extends crossing forming, and f loses for arch, and l is that half span of three-hinged arch stress unit is from (being b with the relation of two step mineral building width b).
Here, effect and the application of additional force are further illustrated.By two step mineral building numbered 1#, 2#, 3#, 4# in Fig. 1, Fig. 2 ... 8#, 9#, then have:
(1) 1#, 2#, 3# bis-step mineral building ore pillar composition structural analysis unit (referred to as unit 1) inner, 1# ore pillar is the A point in Fig. 4, by horizontal force and vertical force effect；2# ore pillar is the C point in Fig. 4, by vertical force effect；3# ore pillar is the B point in Fig. 4, by horizontal force and vertical force effect.Structural analysis unit is acted on by the q of evenly load.
(2) 2# ore pillar is present in again by 2#, 3#, 4# bis-structural analysis unit (referred to as unit 2) of forming of step mineral building ore pillar inner, so 2# ore pillar is in addition to the load action by unit 1, also receive the additional force effect of unit 2, i.e. load action in Fig. 5.In unit 1,2# ore pillar is the C point in force diagram Fig. 4 as indeterminate support rod member, and in unit 2,2# ore pillar is as three-hinged arch hinge A ＇.Therefore, 2# ore pillar is in addition to receiving the active force of unit 1, also by the horizontal force under unit 2 and vertical force effect.
(3) 3# ore pillar is the most as figure shows, B stress point in unit 1, C stress point in unit 2, also have by 3#, 4#, the 5# bis-A stress point in the structural analysis unit (referred to as unit 3) that forms of step mineral building ore pillar, under evenly load, 3# stress point is only by vertical force, and horizontal force is zero by equilibrium relation and symmetrical relations.
(4) from symmetry, 8# ore pillar is identical with 2# ore pillar stress, and 9# ore pillar is identical with 1# ore pillar.
(5) big for thickness or pole big thick ore body, this method is applicable to the loading characteristic of three kinds of dissimilar mineral building ore pillars.Wherein, two step mineral building ore pillar 1#, 2#, 3# ... 8#, 9#, can be divided three classes, wherein, 1# and the 9# ore pillar of upper lower burrs side is the first kind, 2# and the 8# ore pillar of next-door neighbour's upper lower burrs side ore pillar is Equations of The Second Kind, in the middle of remaining as 3#, 4#, 5#, 6#, 7# ore pillar be the 3rd class.
Fig. 6 is indeterminate rod member Stability Analysis of Compressed Column figure, and one end is fixed, the hinged form in one end.
This inclined thick gulf even company in the mineral building construction design method of structural system is divided into multiple three-hinged arch construction unit across structural system according to one, two step mineral buildings, has 3 two step mineral building ore pillars and 2 step mineral building dead zones in each construction unit.Research draws, when by under evenly load and adjacent structural units additional force effect, comprehensively connect the force structure unit characteristics supporting ore pillar across structure, utilize mole coulomb and limit equilibrium theory, use in pressure bar stabilization institute, two step mineral buildings (are assumed to regard a post as by two step mineral building span (width) b, three-hinged arch construction unit half across l, in i.e. Fig. 3, A and B is assumed to be a little, l be a step mineral building width or single three-hinged arch half across), relation formula between level interval (mineral building height) hcr as follows:
L=α b (II)
In formula, l is a step mineral building width (mined-out area span, three-hinged arch structure half across), m；B is two step mineral building width, m；It is a step mineral building width and the coefficient of relationship of two step mineral building width； For internal friction angle, °；C is cohesive strength, MPa；Hcr is level interval, m；E is the elastic modelling quantity of ore deposit rock mass, GPa；The evenly load value of mining room overlying rock effect, KN/m headed by q2；" 1 " in above-mentioned footnote, " 2 ", " 3 " represent first kind ore pillar, Equations of The Second Kind ore pillar and the 3rd class ore pillar respectively.
1, ore deposit rock actual physics mechanical property parameter is substituted into formula I and formula II and can try to achieve three class formation unit half across, mineral building width and the relation of level interval.
2, step mineral building span (width) and two steps mineral building span (width) preferably take 16m～24m.
3, by the available α (α of formula group (I)1、α2And α3) value；When α >=2, the indeterminate three-hinged arch construction unit good stability in the case of this is described；As 1≤α ＜ 2, illustrate that the indeterminate three-hinged arch construction unit stability in the case of this is general；As α ＜ 1, illustrating that the dead zone span after a step mineral building back production not should be greater than two steps and supports the width of mineral building, larger thickness ore pillar to be stayed supports safeguards STOPE STABILITY, and less stable is described.Considering safety, the α value of actual design is the minima in above three value of calculation, the α value of actual design substitutes into public formula II, i.e. can get a step mineral building width and the design proportioning of two step mineral building width, clearly represent the relation of l and b.
4, level interval h under inhomogeneity ore pillar construction unit is calculated according to formula group (III)cr1、hcr2And hcr3.Consider safety, the h of actual designcrShould be equal to or less than the minima of above three value of calculation.
By above-mentioned formula and the process of analysis, can effectively the company of analysis design and stopping sequence across the stability of mineral building structural system, optimization mineral building structure so that large-scale cooperative exploitation in down-hole becomes a reality.
Embodiment: man battalion of department field, South emerging iron mine ore body belongs to inclination or inclined thick gulf, orebody thickness 100～200m, 45 °～60 ° of inclination angle, first water acquisition flat overlying burden q=10.4MPa.Ore body cohesive strength 2.48MPa, internal friction angle 52.8 °, elastic modelling quantity 26GPa, upper lower burrs rock mass cohesive strength 2.15MPa, internal friction angle 48.5 °, elastic modelling quantity 17GPa.
(1) structural parameters calculate:
Parameter substitutes into public formula I and obtains: α1=2.2, α2=0.8, α1=1.2.Again parameter and the public formula II of α value substitution tried to achieve are obtained: hcr1=57.6, hcr2=66.4, hcr3=55.7.
Compromise between security and the uniformity of mining Design, α takes minima 0.8, then a step mineral building width of multiple step format open stope afterwards filling takes 0.8 times of two step mineral building width, i.e. one step mineral building width 16m, two step mineral building width 20m.And hcr takes minima 55.7m as critical pressure pole length, then level interval approximation takes 50m.
(2) estimation of stability:
α is learnt in calculating1=2.2, α2=0.8, α1=1.2.Wherein, α1The width value of=2.2 one step mineral buildings is 2.2 times of two step mineral building width values, illustrates that the indeterminate three-hinged arch construction unit dead zone span of the first kind can be substantially larger than the width supporting mineral building ore pillar, good stability；The width value of one step mineral building is 0.8 times of two step mineral building width values, and the indeterminate three-hinged arch construction unit dead zone span outline width less than support mineral building ore pillar of the first kind is described, stability is general or slightly worse；The width value of one step mineral building is 1.2 times of two step mineral building width values, and the indeterminate three-hinged arch construction unit dead zone span that the first kind is described is suitable with the width value supporting mineral building ore pillar, and stability is general.Comprehensive understanding, the stability of three class ore pillar construction units puts in order as upper lower burrs rock mass from getting well to differing from > ore body.
(3) stopping sequence preliminary assessment:
According to above-mentioned stability analysis result, the stopping sequence of mineral building in panel can be optimized and advanced by lower wall upwards dish and in the middle of exploitation or the lateral ore body of upper lower burrs two, exploit a step mineral building.
Claims (2)
1. an inclined thick gulf is even across the mineral building construction design method of structural system, it is characterized in that: be divided into several indeterminate three-hinged arch construction units according to one, two step mineral buildings each construction unit having 3 two step mineral building ore pillars and 2 step mineral building dead zones constitute；
(1) calculate by following formula group (I), public formula II and formula group (III) according to ore deposit rock actual physics mechanical property；
L=α b (II)
In formula:
L is a step mineral building width, m；
B is two step mineral building width, m；
α is a step mineral building width and the coefficient of relationship of two step mineral building width；
For internal friction angle, °；
C is cohesive strength, MPa；
Hcr is level interval, m；
E is the elastic modelling quantity of ore deposit rock mass, GPa；
The evenly load value of mining room overlying rock effect, KN/m headed by q2；
(2) α under inhomogeneity ore pillar construction unit is calculated according to formula group (I)1、α2And α3Value, the α value of actual design is the minima in above three value of calculation, the α value of actual design substitutes into public formula II, i.e. can get a step mineral building width and the design proportioning of two step mineral building width；
(3) level interval h under inhomogeneity ore pillar construction unit is calculated according to formula group (III)cr1、hcr2And hcr3, the h of actual designcrShould be equal to or less than the minima of above three value of calculation.
Inclined thick gulf the most according to claim 1 is even across the mineral building construction design method of structural system, it is characterised in that: the width span of a described step mineral building and two step mineral buildings is 16m～24m.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106640080A (en) * | 2017-02-17 | 2017-05-10 | 中南大学 | Deep part high-stress environment self-stabilizing arched stope arrangement mining method |
| CN107893658A (en) * | 2017-11-20 | 2018-04-10 | 中冶北方（大连）工程技术有限公司 | Big thick ore body stage open stope afterwards filling mining methods in pole under strong ground pressure ring border |
| CN108843321A (en) * | 2018-05-31 | 2018-11-20 | 河北钢铁集团矿业有限公司 | A kind of horizontally disposed method of inclined thick gulf mineral building |
| CN109740181B (en) * | 2018-12-04 | 2022-09-30 | 昆明理工大学 | Method for calculating size of ore pillar by open stope mining method |
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