CN103696775A - Large-stage-height multi-group water-containing layer segmented downward grouting method - Google Patents
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Abstract
The invention discloses a large-stage-height multi-group water-containing layer segmented downward grouting method and belongs to the field of stratum grouting and plugging water. The large-stage-height multi-group water-containing layer segmented downward grouting method comprises the steps of punching grouting holes; arranging the grouting holes in an inner-outer ring mode, wherein the ring diameter of the inner ring and the number of the inner-ring grouting holes are smaller than the ring diameter of the outer ring and the number of the outer-ring grouting holes, and the inner-ring grouting holes are larger than the outer-ring grouting holes in radial angle; adopting large-stage-height drill holes; adopting a hydraulic underground drill rig to perform drilling, wherein the drilling speed is 10m/h, and the hydraulic underground drill rig has an automatic rod-discharging function; enabling the grouting holes to meet large-stage-height drilling conditions; installing grouting pipes in the grouting holes, enabling the grouting pipes and a grouting machine to be connected and arranging a slurry cushion between the grouting machine and the grouting pipes; performing grouting, wherein the grouting pressure is 2-4 times of underground hydrostatic pressure; using 2 times of hydrostatic pressure to plug large gaps at an earlier stage; using 3-4 times of hydrostatic pressure to plug small gaps and voids at a later state. The large-stage-height multi-group water-containing layer segmented downward grouting method has the advantages of low cost, high construction speed, good social benefit and the like.
Description
Technical field
The present invention relates to a kind of large section high descending slip casting method of many group aquifer segmentations, possession layer grouting for water blocking construction technology.Mainly be applicable to for large section high (aquifer thickness is greater than 120m) note chemical grout for formation pore hydromining, this slurry injection technique can be similar water exclusion of stratum work effective experience for reference is provided, especially pre grouting from the working face technology important supplementing.
Background technology
Expansion along with underground mine engineer exploitation scale, increasing engineering usually runs into the bad grounds such as various aquifers, sandstone crack, pore water, limestone cavern water, fault belt water, Genesis of Karst Subsided Column water, old empty water, these stratum are abundant water often, water yield is large, may cause gushing water, cave in, the accident such as inbreak, even cause security incidents such as flooding well and casualties.Stratum grouting for water blocking construction technology, is to administer these bad grounds, and one of effective technology method of water damage may occur or occur in elimination.
More when shaft of vertical well aquifer, and under the condition that interlamellar spacing is large or buried depth is darker, the method for harnessing the river is used additive method, and as freezing process, pre grouting from the surface method, its duration is long or cost is larger.For this class roadway, chamber water blockoff, pre grouting from the working face is first-selected method.
Along with the development of national economy, energy demand is more and more, and superficial part field with "nine squares" major part is developed, and coal resources can not be regenerated, and newly-built pit shaft is more and more darker, and geological conditions is corresponding poor.The Northwest particularly, exploitation be Yanan Formation, Jurassic System layer.The Jurassic stratum diagenesis time is more late, and rock is half diagenesis, weak fixed shape, and well side country rock is met the easy argillization of water, side collapses.There is difference on the character in aquifer and Permo-Carboniferous system stratum.Permo-Carboniferous system aquifer is generally the sandstone that degree of consolidation is harder, and crevice water be take as main in aquifer, and its thickness in monolayer is no more than 50m.And Jurassic system aquifer is generally the packsand of sand argillaceous agglutination, middle sandstone, gritstone, conglomerate aquifer, take pore water as main, thickness is larger, as mines such as the Cui Mu of Bin County northwest, Shao Zhai, the full section of Jurassic system Luo He group is moisture, thickness 250-300m, straight sieve group strong aquifer thickness 120m left and right, Yinchuan of Ningxia Province south, the Jurassic system aquifer thickness in monolayer of the most of mines in the Inner Mongol all surpasses 100m.The darker pit shafts in ground such as Henan, Anhui, Shandong, top is coated with thick-layer Jurassic system aquifer.These stratum are due to complex geologic conditions, and slip casting is harnessed the river and is concealed work, in construction often due to theoretical and lack experience, with blindness and randomness, cause the especially soft rock pore water slip casting of some Grouting engineering, spent very large cost, but fallen flat.
Summary of the invention
The invention provides a kind of large section high descending slip casting method of many group aquifer segmentations, there is the features such as expense is low, speed of application is fast, social benefit is good.
The present invention realizes with following technical scheme: a kind of large section high descending slip casting method of many group aquifer segmentations, and concrete steps are as follows:
1) beat injected hole; Injected hole divides inside and outside two circles to arrange, the circle footpath of inner ring hole, hole count are less than cycle hole, and the radial angle of inner ring hole is greater than cycle hole; Cycle hole is for shutoff pore water, crevice water; Adopt the high boring of large section; The employing hydraulic tunnel drilling machine of drilling, rate of penetration 10m/h, has the function of automatically unloading bar, hole depth 150m; Injected hole meets the condition of large section high brill note;
2) Grouting Pipe is installed in injected hole, and Grouting Pipe is connected with slurry filling machine, between slurry filling machine and Grouting Pipe, establish grout cover; Grout cover must can bear final grouting pressure; In pit shaft, grouting pipeline adopts Φ 51 * 6mm seamless steel pipe, and the ball valve pressure that orifice tube connects is 32 Μ pa; Drainage bucket in drainage layer adopts Φ 325mm or Φ 273mm steel pipe manufacturing, upper end welding high pressure flange, lower end closed;
3) slip casting: grouting pressure is selected 2-4 times of underground water static pressure; Early stage the larger crack of shutoff, 2 times of getting hydrostatic pressure; Later stage, for rimala, hole, is got the 3-4 of hydrostatic pressure doubly; 2/3 of the maximum pressure of described slurry filling machine need reach final pressure, prevents from causing facility fault because of long time running at full capacity; The stratum good to the property noted selects 2 slurry filling machines to carry out slip casting simultaneously, shortens the slip casting time; The stirring of slurries adopts pit shaft build 2 concrete mixers that concrete uses and a secondary agitator is set.
The invention has the beneficial effects as follows: the aquifer of large section high pre-slip casting of work plane to different depth, there is flexibility, specific aim, and have and reduce expenses and the advantage such as duration, reduced with short section high ratio the series of problems that operation conversion occurs, as repeatedly stopped work, return to work, vocational training for the workers and staff is on duty, the maintenance of equipment and materials, buying etc.Therefore, large section high soft rock slip casting of work plane administers the new approach of having verified to the complicated water bearing ground of all kinds of different depths.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described.
Accompanying drawing 1 is the injected hole distribution map of the descending slip casting method of the high many group aquifer segmentations of large section.
In figure: 1, outer ring injected hole, 2, inner ring injected hole.
The specific embodiment
The large section high descending slip casting method of many group aquifer segmentations, concrete steps are as follows:
1) beat injected hole; As shown in Figure 1, according to the hydrogeological feature on noted stratum, injected hole is set, injected hole divides inside and outside two circles to arrange, the circle footpath of inner ring injected hole 2, hole count are less than outer ring injected hole 1, and the radial angle of inner ring injected hole 2 is greater than outer ring injected hole; Outer ring injected hole is for shutoff pore water, crevice water; Adopt the high boring of large section; The employing hydraulic tunnel drilling machine of drilling, rate of penetration 10m/h, has the function of automatically unloading bar, hole depth 150m; Injected hole meets the condition of large section high brill note.Whole hole can also be set broken to upper strata lithology, spray rock fragment section is reinforced.
2) Grouting Pipe is installed in injected hole, and Grouting Pipe is connected with slurry filling machine, between slurry filling machine and Grouting Pipe, establish grout cover; Grout cover must can bear final grouting pressure; In pit shaft, grouting pipeline adopts Φ 51 * 6mm seamless steel pipe, and the ball valve pressure that orifice tube connects is 32 Μ pa; Drainage bucket in drainage layer adopts Φ 325mm or Φ 273mm steel pipe manufacturing, upper end welding high pressure flange, lower end closed;
3) slip casting: grouting pressure be promote slurries in crack, the power of flow of pore, diffusion filling, compacting, be one of key factor of controlling slurries diffusion length, the 2-4 that grouting pressure is generally selected underground water static pressure doubly; Early stage, the larger crack of shutoff, got low value, was 2 times of hydrostatic pressure; Later stage is for rimala, hole, gets high value, is 3-4 times of hydrostatic pressure; 2/3 of the maximum pressure of described slurry filling machine need reach final pressure, prevents from causing facility fault because of long time running at full capacity; The stratum good to the property noted selects 2 slurry filling machines to carry out slip casting simultaneously, shortens the slip casting time; The stirring of slurries adopts pit shaft build 2 concrete mixers that concrete uses and a secondary agitator is set.
Injecting paste material is selected according to special formation (Porosity Aquifer); More practical material is pollopas.
Application example 1
1. the Shandong colliery auxiliary shaft pre grouting from the working face construction of living in peace
The clean diameter 6.5m of the colliery auxiliary shaft of living in peace, is Jurassic stratum in-730～-885m section (thickness 155m), by rufous, aubergine mudstone, siltstone, packsand, in sandstone, gritstone form, argillaceous agglutination, lithology is loose, and coefficient of softening is less than 0.75, easily argillization.Aquifer vertical distribution is relatively disperseed.Water content is along with the increase of rock sand content, the increase of particle and increasing.Belong to large section aquifer.The character in aquifer belongs to hole, crack artesian water.Bore flooding quantity 28m3/h, estimates inflow of water 80m3/h, and Methods of Water Conservancy is taked pre grouting from the working face.22 of injected holes, radial angle 2.5 degree, pitch of holes 0.68m, whole pitch of holes 2.05m, the waste footpath 3m of whole pitch-row.Duan Gao overall length 155m, utilizes a grout cover, and minute 4 subsection slip castings are divided according to being to determine with lithology and bore flooding quantity size, and the start-stop degree of depth of 4 subsections is 0-45m, 45-80m, 80-116m, 116-155m.Boring note is sequentially to treat that a segmentation reaches slip casting ending standard, then drills and extend to next section high from aperture.
Slip casting ending standard is 2-3 times of grouting pressure 18-26 Μ pa(hydrostatic pressure), through cleaning bottom of hole inspection, bore flooding quantity is less than 0.5m3/h.Inject altogether cement 2830t, pollopas 110t.Every meter of pit shaft cement 16t, pollopas 0.7t.
Shaft excavation has no water burst, has realized and has beaten dry-well, and reinforced pit shaft country rock, has obtained good economic benefit and social benefit, is harnessing the river of similar engineering, and successful new technology exemplary applications is provided.
2. Shandong justice can the construction of coal master's well shaft pre grouting from the working face
The clean diameter 5m of Shandong justice energy coal master's well shaft, in-647～-770m section (thickness 123m), be Jurassic system and Permian System, by sepia, canescence siltstone, packsand, in sandstone, gritstone, mud stone form, basal water is middle sandstone, gritstone, water barrier is siltstone, mud stone, and aquifer and water barrier are alternating layers shape, bore flooding quantity 26.6m3/h, estimate inflow of water 70m3/h, Methods of Water Conservancy is taked pre grouting from the working face.16 of injected holes, radial angle 2.8 degree, pitch of holes 0.74m, whole pitch of holes 3.8m.Use this grout cover to divide 3 sections of slip castings, divide according to being to determine with lithology and bore flooding quantity size, boring injecting method is to treat that a segmentation reaches slip casting ending standard, then drills and extend to next section high from aperture.
Slip casting ending standard is 2.5-3 times of grouting pressure 19-23 Μ pa(hydrostatic pressure), through cleaning bottom of hole inspection, bore flooding quantity is less than 0.5m3/h.Inject altogether cement 1200t, pollopas 730T.Every meter of pit shaft cement 9.77t, pollopas 5.93t.
Shaft excavation water yield is less than 2m3/h, has reached slip casting anticipation effect, and has reinforced pit shaft country rock, has obtained good economic benefit and social benefit, is harnessing the river of similar engineering, and successful new technology exemplary applications is provided.
The stratum that justice energy coal master well shaft inspection eye discloses has from top to bottom: Quaternary system, Jurassic system, Permian System, each stratum characteristic is described below respectively: table soil section degree of depth 231m, the Jurassic system degree of depth 231～765m, thick 534m, by variegated siltstone, mud stone and grey packsand, in sandstone, form containing gravel gritstone.High angle tiny crack is grown, loose containing hole, crack artesian water lithology, easily argillization.6 °～8 ° of stratigraphic dips, checking holes does not find fault belt and solution cavity.
1. grouting design
This grouting horizon is Jurassic system aquifer, and the slip casting section start-stop degree of depth is 620m(water barrier rock cap 10m)-775m(enters water barrier 10m), total length 155m.35 of grouting borehole designs, minute 2 circles are arranged, inner ring hole circle footpath φ 3.6m, 15 of hole counts, 5 ° of radial angles, drop on 3.2m outside waste footpath at the bottom of the 50m location hole of whole hole, and effect is broken for upper strata lithology, and spray rock fragment section is reinforced.Cycle hole circle footpath φ 3.8m, 20 of hole counts, 2.5 ° of radial angles, drop on 3.2m outside waste footpath at the bottom of 100m location hole, and 155m drops on 5.6m outside waste footpath.Effect is shutoff pore water, crevice water.
Grouting pressure: grouting pressure be promote slurries in crack, the power of flow of pore, diffusion filling, compacting, be one of key factor of controlling slurries diffusion length, generally select the 2-4 of underground water static pressure doubly.Early stage, the larger crack of shutoff, got low value (hydrostatic pressure 2 times); Later stage, for rimala, hole, is got high value (3-4 of hydrostatic pressure doubly).
2. mortar depositing construction process and effect
Mortar depositing construction operation is: grout cover height of excavation section reaches requirement → bore and water to be visited in rock stratum, bottom (object is to verify top board position and the water yield in aquifer with umbrella, the quality of orifice tube is buried in assurance underground) → above carry 3m build wall large form → utilizations build wall large form set up during drilling machine platform → rig is fixed on large form → buries underground orifice tube enters rock 2m left and right → bury drainage bucket and drainage layer → concreting maintenance 7d(underground the grout cover top borehole wall is carried out to grouting behind shaft or drift lining reinforcing) → make the brill of relief hole → drainage layer and orifice tube reinforcing → normally, note reaches designing requirement.
The pre-Grouting engineering of main vertical shaft working surface, finishes from grout cover construction on February 4th, 2011.At the above 1.5m borehole wall of grout cover, be around evenly arranged 6 relief holes, first to the borehole wall and grout cover consolidation grouting, prevent from altering and damaging the borehole wall and grout cover by pressure on slurries, grouting pressure reaches 3 times of 23 Μ pa(hydrostatic pressures), the borehole wall, grout cover are safe and sound.。
35 injected holes of work plane are divided into 3 groups, first group of hole 1#-15#, hole depth 50m, 5 ° of radial angles, construction in advance, injected water mud, the larger crack of main shutoff.Second group, the 3rd group amounts to 20 holes, minute 2 groups of constructions, and second group of hole is odd numbers hole, i.e. 17#, 19#, 21#, 23#, 25#, 27# ... 35#, hole depth 100m, 2.5 ° of radial angles.The 3rd group of hole is even numbers hole, 16#, 18#, 20#, 22#, 24#, 26# ... 34#, hole depth 155m, 2.5 ° of radial angles, each grouting pressure of organizing hole successively improves, and then second group of hole (odd numbers hole) is swept out again, be extended deep to 155m, high pressure is injected chemical pulp.
End March 30, total duration 45d, cleaning bottom of hole is 4 times altogether, injection rate cement paste 2040t, chemical pulp 1227t, under each section of duration, water yield, grouting pressure are listed as:
First group of hole, bores and notes 14 days-February 20 February on date, and boring maximum flooding quantity 29m3/h is down to 7m3/h, and other each bore flooding quantities are down to the front cleaning bottom of hole water yield of 7-5m3/h(slip casting for the second time) final grouting pressure 15 Μ pa.
Second group of hole drill noted 21 days-March 1 February on date, and boring maximum flooding quantity 14m3/h is down to 7m3/h, and other each bore flooding quantities are down to 5-3m3/h, final grouting pressure 18 Μ pa.
The 3rd group of hole drill noted 2 days-March 14 March on date, and boring maximum flooding quantity 15m3/h is down to below 2m3/h, and other bore flooding quantities are down to 2m3/h, final grouting pressure 23 Μ pa.
Second group of odd numbers hole drill noted 15 days-March 30 March on date, and boring maximum flooding quantity 5m3/h is down to 1.5m3/h, final grouting pressure 24 Μ pa.
Inspection eye: the boring that the borehole inspection of rear construction is first constructed, second group of hole checks first group of water yield more than hole 50m, the 3rd group of hole checks second group of water yield more than hole 100m, until the 3rd group of hole, note again and reach bore flooding quantity and be less than after 2m3/h, the 4th group of hole is that former second group of hole depth is extended deep to 155m by former 100m, inject chemical pulp, reach single hole water yield and be less than 1.5m3/h.
After Shaft Excavation, check slip casting effect, pit shaft total yield 6m3/h, reaches sinking and drifting code requirement.
1. boring is arranged and is seen Fig. 1.
2. main shaft rock section column is in Table 1.
3. main shaft rock section pre grouting from the working face parameter is in Table 2.
Table 1 main shaft geology column table
Claims (1)
1. large section is high organizes the descending slip casting methods of aquifer segmentation more, it is characterized in that: concrete steps are as follows:
1) beat injected hole; Injected hole divides inside and outside two circles to arrange, the circle footpath of inner ring injected hole, hole count are less than outer ring injected hole, and the radial angle of inner ring injected hole is greater than outer ring injected hole; Outer ring injected hole is for shutoff pore water, crevice water; Adopt the high boring of large section; The employing hydraulic tunnel drilling machine of drilling, rate of penetration 10m/h, has the function of automatically unloading bar, hole depth 150m; Injected hole meets the condition of large section high brill note;
2) Grouting Pipe is installed in injected hole, and Grouting Pipe is connected with slurry filling machine, between slurry filling machine and Grouting Pipe, establish grout cover; Grout cover must can bear final grouting pressure; In pit shaft, grouting pipeline adopts Φ 51 * 6mm seamless steel pipe, and the ball valve pressure that orifice tube connects is 32 Μ pa; Drainage bucket in drainage layer adopts Φ 325mm or Φ 273mm steel pipe manufacturing, upper end welding high pressure flange, lower end closed;
3) slip casting: grouting pressure is selected 2-4 times of underground water static pressure; Early stage the larger crack of shutoff, 2 times of getting hydrostatic pressure; Later stage, for rimala, hole, is got the 3-4 of hydrostatic pressure doubly; 2/3 of the maximum pressure of described slurry filling machine need reach final pressure, prevents from causing facility fault because of long time running at full capacity; The stratum good to the property noted selects 2 slurry filling machines to carry out slip casting simultaneously, shortens the slip casting time; The stirring of slurries adopts pit shaft build 2 concrete mixers that concrete uses and a secondary agitator is set.
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| CN107035389A (en) * | 2017-06-01 | 2017-08-11 | 新疆北新路桥集团股份有限公司 | A kind of construction method for grouting reinforcement and earth's surface construction method |
| CN107060767A (en) * | 2017-05-25 | 2017-08-18 | 安徽理工大学 | Deep vertical stratum consolidation filling system and its grouting method under existing wellbore conditions |
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| CN112012770A (en) * | 2020-07-26 | 2020-12-01 | 中铁二院工程集团有限责任公司 | Underground water advanced treatment structure and construction method for ultra-deep vertical shaft of railway tunnel |
| CN113006795A (en) * | 2021-04-09 | 2021-06-22 | 中国煤炭地质总局勘查研究总院 | Treatment method of sandstone water on top plate of Jurassic coal field |
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| CN113153212A (en) * | 2021-04-30 | 2021-07-23 | 北京科技大学 | Vertical shaft high-water-pressure stratum grouting device and construction method |
| CN113464144A (en) * | 2021-06-16 | 2021-10-01 | 枣庄矿业(集团)有限责任公司 | Ground grouting process for treating water leakage and cracks of coal mine shaft in Lunan region |
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