CN102493467A - Construction method for using three-dimensional composite drainage mesh for diverting seepage of tailings stacked dam - Google Patents
Construction method for using three-dimensional composite drainage mesh for diverting seepage of tailings stacked dam Download PDFInfo
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Abstract
A construction method for using three-dimensional composite drainage meshes for diverting seepage of a tailings stacked dam includes the steps: firstly, making construction preparation; secondly, paying off lines; thirdly, digging trenches; fourthly, laying geotextile; fifthly, backfilling; and sixthly, discharging. The construction method is based on construction experiences practically concluded for years, is beneficial to popularization and application of the three-dimensional composite drainage meshes to seepage diversion for tailing stacking, and is beneficial to providence of construction guide, safety and environmental accidents of a tailings pond can be reduced, level of management of the tailings pond can be increased, and the method is applicable to the field of application of seepage diversion for tailings stacked dams.
Description
Technical field
The present invention relates to draining, lead the construction of oozing, further, relate to the three-dimensional composite drainage network of mine tailing fill dam utilization and lead the job practices of oozing.
Background technology
In order to reduce mine tailing storehouse fill dam phreatic line, improve the angle of internal friction of dam body; Reduce the osmotic pressure of Ba Neikongxishui, thereby strengthen the stability of dam body, need lay to lead at base of dam and ooze body.Say to lead from material and ooze body a lot of types are arranged, for example: lead and ooze pipe, geotextiles rubble parcel, three-dimensional composite drainage network etc.The mine tailing fill dam led ooze body; Practical experience through for many years shows; Three-dimensional composite drainage network is led and is oozed best results, and three-dimensional composite drainage network is a kind of novel geosynthetics, and, construct comparatively complicacy higher relatively with three-dimensional composite drainage network cost and the bad meeting of process control cause piping, seepage, lead many hidden danger such as oozing partial failure; Therefore its job practices is very important, but does not also have the job specfication of this respect at present.
Summary of the invention
The object of the present invention is to provide the job specfication that works the three-dimensional composite drainage network of leading the effect of oozing at the mine tailing fill dam, instruct for this technology provides construction technology.
The three-dimensional composite drainage network of a kind of mine tailing fill dam utilization of the present invention is led the job practices of oozing, and this method comprises the following steps:
One, preparation of construction:
(1) add dam Xiu Po: fill dam is increased slope outside 2 meters left and right sides Shi Xiu, and the outer side slope of tailing dam is than generally being controlled at 1:2.5 ~ 1:3, and the finishing of outer slope finishes; Build a dam for wet method and again the dam to be increased 2 meters; Dry method is built a dam not to be needed to increase again, and then with the dam crest levelling, width at dam crest should be greater than 25 meters;
(2) water transfer subregion: will lay the ponding of leading the zone of oozing and call away, and all cut mine tailing slurry to not laying and to lead the zone of oozing;
(3) material purchases: the length of oozing fill dam is led in laying according to need, calculates the amount that needs the three-dimensional composite drainage network of buying, confirms the performance indications and the model of its material;
Two, unwrapping wire: three-dimensional composite drainage network is led and is oozed body and need prolong both direction and lay, that is: perpendicular to the horizontal three-dimensional composite drainage network and the vertical three-dimensional composite drainage network that is parallel to axis of dam direction of axis of dam direction; When the axis of dam is straight line; Horizontal three-dimensional composite drainage network center distance b=6 ~ 8 meters; If the axis of dam is a curve, the figure that surrounds to three-dimensional composite drainage network in length and breadth be one fan-shaped, the chord length that at this moment horizontal three-dimensional composite drainage network center distance is got fan-shaped minimum arc is a center distance; Horizontal three-dimensional composite drainage network is the benchmark unwrapping wire with the base of dam, confirms horizontal three-dimensional composite drainage network end and longitudinal drainage net installation site, the length L of horizontal three-dimensional composite drainage network=20 ~ 25 meter; The sideline of vertical three-dimensional composite drainage network is concordant with horizontal three-dimensional composite drainage network end, connects into comb shape to three-dimensional composite drainage network in length and breadth; Spread out the position of line then with clay or flyash, be convenient to the facility construction operation;
Three, ditching: dig out the ditch of laying three-dimensional composite drainage network according to unwrapping wire; 2.5 meters of ditch bottom width, 2 ~ 3 meters of ditch depths, the section of every ditch should become trapezoidal;
Four, lay native fabric:
(1) lay: at first lay horizontal three-dimensional composite drainage network ditch is handled well after, horizontal three-dimensional composite drainage network stretches out dam body should expose 1 meter long and to be tiled in the dam slope pin domatic, and exposed parts employing stone is pushed down; Horizontal three-dimensional composite drainage network head end should be near the furrow bank of vertical ditch, repaves vertical three-dimensional composite drainage network after being routed to 4 ~ 5, lets vertical three-dimensional composite drainage network be pressed in the end of horizontal drainage network;
(2) overlap joint: horizontal three-dimensional composite drainage network is connected with vertical three-dimensional composite drainage network; It is wide at first to be that the non-woven geotextile of two three-dimensional composite drainage network joints that need are connected is torn 25cm; Cut middle net heart 20cm with cutter; Two net heart ends are welded with the downhand welding mode, and the employing mode that sews up or weld connects the non-woven geotextile of grid both sides respectively then;
(3) tape edge: the three-dimensional composite drainage network that is laid in the dam body must be stitched together the nonwoven of both sides around the net heart, avoids mine tailings to get into the net podiod and rings three-dimensional composite drainage network water guide performance;
Five, backfill: every layer of backfill thickness must not be greater than 40cm, and every backfill one deck needs the excavator bucket compacting; Dry method is built a dam can be with in length and breadth to the whole backfills of ditch; The whole backfills of vertical ditch that wet method is built a dam, traverse furrow can only backfill in half range, half range need be treated to use the wet slag backfill behind the blowing in addition;
Six, blowing: dry method is built a dam backfill when finishing last one deck, and steamroller can be put the mine tailing slurry in the storehouse; Wet method is built a dam also need the blowing ditch be failed and is led to, increases, and must adopt the segmentation blowing, and every segment length must not treat that the top of the slag covering of blowing ditch reaches more than 2 meters greater than 50 meters, stops starching and drags for the other half range traverse furrow of slag backfill traverse furrow.
Points for attention:
1, oozes construction and the time safety and environmental protection accident occurs for fear of leading, lead and ooze construction and be chosen in the dry season as far as possible and carry out in laying.
2, wet method is built a dam and in the blowing process, will be paid special attention to observe the water guide situation of three-dimensional composite drainage network; If muddy slurry appears in three-dimensional composite drainage network and periphery; Should stop immediately to starch also to reduce the water surface in the ditch and check; If hole needs backfill again, if do not find that hole can go out the ease point at slurry and press with piece stone that the method for geotextiles is counter filters solution.
The inventive method is the construction experience that goes out according to practice summary for many years, helps promoting three-dimensional composite drainage network and in mine tailing is piled up, leads the application of oozing; Help instructing for this technology provides construction; Help reducing safety, the environmental protection accident in mine tailing storehouse, help improving managerial skills the mine tailing storehouse.The inventive method is applicable to leads the application of oozing in the mine tailing fill dam.
Description of drawings
Fig. 1 is the three-dimensional composite drainage network structural representation of the present invention's construction;
Fig. 2 is the A-A sectional drawing of Fig. 1;
Among the figure: 1, horizontal three-dimensional composite drainage network; 2, vertical three-dimensional composite drainage network; 3, silica.
The specific embodiment
Below in conjunction with embodiment the present invention is described further.
Embodiment:
Certain phosphate fertilizer plant of Co., Ltd adopts the three-dimensional composite drainage network of mine tailing fill dam utilization of the present invention to lead the job practices of oozing, and comprises the following steps:
One, preparation of construction:
(1) adds dam Xiu Po: adopt flat bucket to excavate slope outside the machine maintenance when fill dam is increased to 2 meters left and right sides; The outer slope of tailing dam is than being controlled at 1:2.5 ~ 1:3, and the finishing of outer slope finishes the dam is increased, and wet method is built a dam and increased 2 meters; Dry method is built a dam and need do not increased again; With the dam crest levelling, the discrepancy in elevation should be less than 20cm then, and width at dam crest should be greater than 25 meters;
(2) water transfer subregion:, its dried beach length is satisfied with mine tailing storehouse grade do the beach length requirement accordingly if the more or dried beach of ponding, mine tailing storehouse length needs ponding in the storehouse is called away less than allowing to do beach length; Subregion is carried out in the mine tailing storehouse, need are laid the ponding lead the zone of oozing call away, and all cut the mine tailing slurry to not laying and to lead the zone of oozing;
(3) material purchases: be used for the mine tailing fill dam and lead the three-dimensional composite drainage network that oozes, model is selected 1600g/m for use
2, fabric width 2m, the width of cloth is long to be selected more than or equal to transverse row network of rivers length, and the geotextiles of net heart both sides must be the long filament non-woven geotextile, and three-dimensional composite drainage network performance indications are seen table ();
Table (one)
| Sequence number | Project | Unit | Standard value |
| 1 | The complex mass area ratio | g/m 2 | ≥1600 |
| 2 | The non-woven geotextile mass area ratio | g/m 2 | ≥300 |
| 3 | The composite membrane mass area ratio | g/m 2 | ≥400 |
| 4 | Web-roll core thickness | mm | ≥5.0 |
| 5 | Complex thickness | mm | ≥8.0 |
| 6 | The peel strength of web-roll core and nonwoven | KN/m | ≥0.3 |
| 7 | The nonweaven geotextile apparent pore diameter | mm | ≥0.18 |
| 8 | The tensile strength of web-roll core | kN /m | ≥30.0 |
| 9 | The complex hydraulic conductivity | m 2/s | ≥1.2×10-3 |
| 10 | Net heart carbon black content | ％ | ≥2％ |
| 11 | Net heart density | g/cm 3 | ≥0.94 |
| 12 | Net heart melt index | g/min | ≥10 |
| 13 | The non-woven geotextile trap tear strength | kN | ≥0.356 |
| 14 | The anti-intensity that punctures of non-woven geotextile | kN | ≥0.58 |
| 15 | Complex tensile strength | kN／m | ≥７ |
| 16 | Complex compressive strength | mpa | ≥０.2 |
Two, unwrapping wire: three-dimensional composite drainage network is led and is oozed body and need prolong both direction and lay, that is: perpendicular to the horizontal three-dimensional composite drainage network 1 and the vertical three-dimensional composite drainage network 2 that is parallel to axis of dam direction of axis of dam direction; When the axis of dam is straight line; Horizontal three-dimensional composite drainage network 1 center distance b confirms according to the water content size of mine tailing; B=6 ~ 8 meter; If the axis of dam is a curve, the figure that vertical and horizontal three-dimensional composite drainage network surrounds be one fan-shaped, the chord length that at this moment horizontal three-dimensional composite drainage network 1 is got fan-shaped minimum arc is center distance b; Horizontal three-dimensional composite drainage network 1 is from the base of dam unwrapping wire, the length L of horizontal three-dimensional composite drainage network 1=20 ~ 25 meter, and dam crest end of a period width is greater than 25 meters, and L gets 25 meters; Dam crest end of a period width is less than 25 meters, and L gets 20 meters; The sideline of vertical three-dimensional composite drainage network 2 is concordant with horizontal three-dimensional composite drainage network 1 end, and vertical three-dimensional composite drainage network 2 connects into comb shape with horizontal three-dimensional composite drainage network 1; Insert out in length and breadth to the axial location of three-dimensional composite drainage network 1 with the bamboo bar according to unwrapping wire on the spot, spread out the position of line then with clay or flyash, be convenient to the facility construction operation.
Three, ditching: the line of being put with flyash or clay is the installation axis of three-dimensional composite drainage network, adopts excavator to dig out the ditch of laying three-dimensional composite drainage network, 2.5 meters of ditch bottom width, 2 ~ 3 meters of ditch depths; Horizontal ditch grade should be controlled in 2 ~ 3% scopes, forbids to occur adverse slope; The bottom of trench level of should trying one's best longitudinally; The discrepancy in elevation must not be greater than 20cm, and the slag that digs out should be stacked on the spot and be convenient to backfill, and it is trapezoidal that the section of every ditch should become; Furrow bank forbids to hang by the feet shape; Occur landslide when avoiding constructing and cause security incident and backfill unreal, after facility scrape out shape with three-dimensional composite drainage network construction ditch, need that tissue is artificial immediately claps the scum silica frost levelling of bottom of trench tightly;
Four, lay native fabric:
(1) lays: at first lay horizontal three-dimensional composite drainage network 1 after ditch is handled well; Horizontal three-dimensional composite drainage network 1 stretches out dam body should expose 1 meter long and to be tiled in the dam slope pin domatic; Avoid top to build a dam, repair the slope horizontal three-dimensional composite drainage network 1 is covered, exposed parts adopts piece directly to push down for the silica 3 about 15cm; Horizontal three-dimensional composite drainage network 1 head end should be near the furrow bank of vertical ditch, repaves vertical three-dimensional composite drainage network 2 after being routed to 4 ~ 5, lets vertical three-dimensional composite drainage network 2 be pressed in the end of horizontal three-dimensional composite drainage network 1;
(2) overlap joint: three-dimensional composite drainage network connects that at first to be that the non-woven geotextile of both sides, two three-dimensional composite drainage network ends that need are connected is torn 25cm wide; Cut middle net heart 20cm with cutter; Two net heart ends are welded with the downhand welding mode, and the employing mode that sews up or weld connects the non-woven geotextile of grid both sides respectively then;
(3) tape edge: the three-dimensional composite drainage network that is laid in the dam body must be stitched together the nonwoven of both sides around the net heart; The line that is used to sew up or connects three-dimensional composite drainage network need adopt the PE line of corrosion resistance; The line footpath of PE line should be greater than 1.0mm, and intensity should be greater than 13kg;
Five, backfill: need before the backfill earlier to furrow bank, three-dimensional composite drainage network, be used for the mine tailings watering of backfill, water content is controlled at 15 ~ 18%, and every layer of backfill thickness must not be greater than 40cm, and every backfill one deck needs the excavator bucket compacting; Dry method is built a dam can be with in length and breadth to the whole backfills of ditch, half range in the whole backfills of vertical ditch that wet method is built a dam, a traverse furrow backfill, and half range need be treated to use the wet slag backfill behind the blowing in addition; Dried slag backfill finishes needs the excavator crawler belt to roll repeatedly, avoids out seepage and piping;
Six, blowing: dry method is built a dam backfill when finishing last one deck, needs steamroller, can in the storehouse, put the mine tailing slurry, but next dam needs earlier with dam crest face hacking before increasing; Wet method is built a dam also need the blowing ditch be failed and is led to, increases, and must adopt the segmentation blowing, and every segment length must not treat that the top of the slag covering of blowing ditch reaches more than 2 meters greater than 50 meters, stops starching and drags for the other half range traverse furrow of slag backfill traverse furrow.
The three-dimensional composite, water-drain web frame of the present invention's construction was as depicted in figs. 1 and 2 when engineering finished the back use.
The above; It only is preferred embodiment of the present invention; Be not that the present invention is done any pro forma restriction; Anyly do not break away from technical scheme content of the present invention, to any simple modification, equivalent variations and modification that above embodiment did, all still belong in the scope of technical scheme of the present invention according to technical spirit of the present invention.
Claims (1)
1. the job practices that the three-dimensional composite drainage network of mine tailing fill dam utilization leads to ooze comprises the following steps:
One, preparation of construction:
(1) add dam Xiu Po: fill dam is increased slope outside 2 meters left and right sides Shi Xiu, and the outer side slope of tailing dam is than generally being controlled at 1:2.5 ~ 1:3, and the finishing of outer slope finishes; Build a dam for wet method and again the dam to be increased 2 meters; Dry method is built a dam not to be needed to increase again, and then with the dam crest levelling, width at dam crest should be greater than 25 meters;
(2) water transfer subregion: will lay the ponding of leading the zone of oozing and call away, and all cut mine tailing slurry to not laying and to lead the zone of oozing;
(3) material purchases: the length of oozing fill dam is led in laying according to need, calculates the amount that needs the three-dimensional composite drainage network of buying, confirms the performance indications and the model of its material;
Two, unwrapping wire: three-dimensional composite drainage network is led and is oozed body and need prolong both direction and lay, that is: perpendicular to the horizontal three-dimensional composite drainage network and the vertical three-dimensional composite drainage network that is parallel to axis of dam direction of axis of dam direction; When the axis of dam is straight line; Horizontal three-dimensional composite drainage network center distance b=6 ~ 8 meters; If the axis of dam is a curve, the figure that surrounds to three-dimensional composite drainage network in length and breadth be one fan-shaped, the chord length that at this moment horizontal three-dimensional composite drainage network center distance is got fan-shaped minimum arc is a center distance; Horizontal three-dimensional composite drainage network is the benchmark unwrapping wire with the base of dam, confirms horizontal three-dimensional composite drainage network end and longitudinal drainage net installation site, the length L of horizontal three-dimensional composite drainage network=20 ~ 25 meter; The sideline of vertical three-dimensional composite drainage network is concordant with horizontal three-dimensional composite drainage network end, connects into comb shape to three-dimensional composite drainage network in length and breadth; Spread out the position of line then with clay or flyash, be convenient to the facility construction operation;
Three, ditching: dig out the ditch of laying three-dimensional composite drainage network according to unwrapping wire; 2.5 meters of ditch bottom width, 2 ~ 3 meters of ditch depths, the section of every ditch should become trapezoidal;
Four, lay native fabric:
(1) lay: at first lay horizontal three-dimensional composite drainage network ditch is handled well after, horizontal three-dimensional composite drainage network stretches out dam body should expose 1 meter long and to be tiled in the dam slope pin domatic, and exposed parts employing stone is pushed down; Horizontal three-dimensional composite drainage network head end should be near the furrow bank of vertical ditch, repaves vertical three-dimensional composite drainage network after being routed to 4 ~ 5, lets vertical three-dimensional composite drainage network be pressed in the end of horizontal drainage network;
(2) overlap joint: horizontal three-dimensional composite drainage network is connected with vertical three-dimensional composite drainage network; It is wide at first to be that the non-woven geotextile of two three-dimensional composite drainage network joints that need are connected is torn 25cm; Cut middle net heart 20cm with cutter; Two net heart ends are welded with the downhand welding mode, and the employing mode that sews up or weld connects the non-woven geotextile of grid both sides respectively then;
(3) tape edge: the three-dimensional composite drainage network that is laid in the dam body must be stitched together the nonwoven of both sides around the net heart, avoids mine tailings to get into the net podiod and rings three-dimensional composite drainage network water guide performance;
Five, backfill: every layer of backfill thickness must not be greater than 40cm, and every backfill one deck needs the excavator bucket compacting; Dry method is built a dam can be with in length and breadth to the whole backfills of ditch; The whole backfills of vertical ditch that wet method is built a dam, traverse furrow can only backfill in half range, half range need be treated to use the wet slag backfill behind the blowing in addition;
Six, blowing: dry method is built a dam backfill when finishing last one deck, and steamroller can be put the mine tailing slurry in the storehouse; Wet method is built a dam also need the blowing ditch be failed and is led to, increases, and must adopt the segmentation blowing, and every segment length must not treat that the top of the slag covering of blowing ditch reaches more than 2 meters greater than 50 meters, stops starching and drags for the other half range traverse furrow of slag backfill traverse furrow.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109750655A (en) * | 2018-12-19 | 2019-05-14 | 中国水利水电第五工程局有限公司 | A kind of homogeneous earth dam axis of dam downstream vertical row water layer and construction method |
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| CN109750655A (en) * | 2018-12-19 | 2019-05-14 | 中国水利水电第五工程局有限公司 | A kind of homogeneous earth dam axis of dam downstream vertical row water layer and construction method |
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