CN103696775B - The descending slip casting method of the high many group aquifer segmentations of large section - Google Patents

The descending slip casting method of the high many group aquifer segmentations of large section Download PDF

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CN103696775B
CN103696775B CN201310714779.9A CN201310714779A CN103696775B CN 103696775 B CN103696775 B CN 103696775B CN 201310714779 A CN201310714779 A CN 201310714779A CN 103696775 B CN103696775 B CN 103696775B
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hole
injected hole
grouting
slip casting
pressure
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CN103696775A (en
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肖西远
祖玉喜
李天荣
闫振斌
张景军
康广辉
谢洪波
张彦华
宋连英
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China Coal Fifth Construction Co., Ltd.
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Abstract

The invention discloses the descending slip casting method of the high many group aquifer segmentations of a kind of large section, layer grouting for water blocking field, possession.Comprise and 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; Adopt the high boring of large section; Drill employing hydraulic tunnel drilling machine, rate of penetration 10m/h, has the function of automatically unloading bar; Injected hole meets the high condition of boring note of large section; In injected hole, Grouting Pipe is installed, and Grouting Pipe is connected with slurry filling machine, between slurry filling machine and Grouting Pipe, establish grout cover; Slip casting: grouting pressure optionally descends the 2-4 of hydrostatic pressure doubly; In earlier stage the larger crack of shutoff, 2 times that get hydrostatic pressure; Later stage, for rimala, hole, gets the 3-4 of hydrostatic pressure doubly.There is the features such as expense is low, speed of application is fast, social benefit is good.

Description

The descending slip casting method of the high many group aquifer segmentations of large section
Technical field
The present invention relates to the descending slip casting method of the high many group aquifer segmentations of a kind of large section, possession layer grouting for water blocking construction technology.Mainly be applicable to note chemical grout for the large section of formation pore hydromining high (aquifer thickness is greater than 120m), this slurry injection technique can be similar water exclusion of stratum work and provides effective experience for reference, especially one of pre grouting from the working face technology important supplementing.
Background technology
Along with the expansion of underground mine engineer exploitation scale, increasing engineering usually runs into the bad grounds such as various aquifer, sandstone crack, pore water, limestone solution cave water, fault belt water, Genesis of Karst Subsided Column water, old empty water, these stratum often abundant water, water yield is large, gushing water may be caused, cave in, the accident such as inbreak, even cause and flood the security incident such as well and casualties.Stratum grouting for water blocking construction technology, is administer these bad grounds, eliminates and may occur or one of the effective technology method that water damage has occurred.
When shaft of vertical well aquifer is more, and under the condition that interlamellar spacing is comparatively large or buried depth is darker, method of harnessing the river uses additive method, and as freezing process, surface advance grouting slurry processes, its duration is longer or cost is larger.For this kind of roadway, chamber water blockoff, pre grouting from the working face is first-selected method.
Along with the development of national economy, energy demand gets more and more, and superficial part field with "nine squares" major part is developed, and coal resources can not regenerate, and newly-built pit shaft is more and more darker, and geological conditions is corresponding poor.Particularly the Northwest, exploitation be Yanan Formation, Jurassic System layer.Jurassic stratum rock-forming time is more late, and rock is half diagenesis, weak consolidation shape, and well side country rock meets the easy argillization of water, collapse side.There is difference on character and the Permo-Carboniferous system stratum in aquifer.Permo-Carboniferous system aquifer is generally the sandstone that degree of consolidation is harder, and aquifer is based on crevice water, 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, based on pore water, thickness is larger, as the mine such as Cui Mu, Shao Zhai of Bin County northwest, the full section of Jurassic system Luo He group is moisture, thickness 250-300m, straight sieve group strong aquifer thickness about the 120m in Yinchuan of Ningxia Province south, the Jurassic system aquifer thickness in monolayer of the most of mine in the Inner Mongol is all more than 100m.The pit shaft that the ground such as Henan, Anhui, Shandong are darker, 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, often due to theoretical and lack experience in construction, 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 the descending slip casting method of the high many group aquifer segmentations of a kind of large section, 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: the descending slip casting method of the high many group aquifer segmentations of a kind of large section, and concrete steps are as follows:
1) injected hole is beaten; 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 used for shutoff pore water, crevice water; Adopt the high boring of large section; Drill employing hydraulic tunnel drilling machine, rate of penetration 10m/h, has the function of automatically unloading bar, hole depth 150m; Injected hole meets the high condition of boring note of large section;
2) in injected hole, Grouting Pipe is installed, 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 optionally descends the 2-4 of hydrostatic pressure doubly; In earlier stage the larger crack of shutoff, 2 times that get hydrostatic pressure; Later stage, for rimala, hole, gets the 3-4 of hydrostatic pressure doubly; 2/3 of the maximum pressure of described slurry filling machine need reach final pressure, prevents because long time running causes facility fault 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 of concrete and arrange a secondary agitator.
The invention has the beneficial effects as follows: work plane large section of high pre-pouring grout is to the aquifer of different depth, there is flexibility, specific aim, and have and reduce expenses and the advantage such as duration, the series of problems that operation conversion occurs is decreased with short section high ratio, as repeatedly stopped work, return to work, vocational training for the workers and staff is on duty, the maintenance, buying etc. of equipment and materials.Therefore, the high soft rock slip casting of large section of work plane administers to the complicated water bearing ground of all kinds of different depth to have verified a new approach.
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.
Detailed description of the invention
The descending slip casting method of the high many group aquifer segmentations of a kind of large section, concrete steps are as follows:
1) injected hole is beaten; As shown in Figure 1, the feature according to the hydrogeology on noted stratum arranges injected hole, and 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 used for shutoff pore water, crevice water; Adopt the high boring of large section; Drill employing hydraulic tunnel drilling machine, rate of penetration 10m/h, has the function of automatically unloading bar, hole depth 150m; Injected hole meets the high condition of boring note of large section.Can also arrange whole hole broken to upper strata lithology, spray rock fragment section is reinforced.
2) in injected hole, Grouting Pipe is installed, 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, flow of pore, diffusion filling, compacting power, be one of key factor controlling slurries diffusion length, grouting pressure generally optionally descend 2-4 times of hydrostatic pressure; The larger crack of shutoff, got low value, was 2 times of hydrostatic pressure early stage; Later stage, for rimala, hole, gets high level, is 3-4 times of hydrostatic pressure; 2/3 of the maximum pressure of described slurry filling machine need reach final pressure, prevents because long time running causes facility fault 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 of concrete and arrange a secondary agitator.
Injecting paste material is selected according to special formation (Porosity Aquifer); More practical material is pollopas.
Application example 1
1. live in peace the construction of colliery auxiliary shaft pre grouting from the working face in Shandong
The clean diameter 6.5m of colliery auxiliary shaft of living in peace, is Jurassic stratum in-730 ~-885m section (thickness 155m), is made up of rufous, aubergine mudstone, siltstone, packsand, middle sandstone, gritstone, argillaceous agglutination, lithology is loose, and coefficient of softening is less than 0.75, easy argillization.Aquifer vertical distribution compares dispersion.Water content 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, estimate inflow of water 80m3/h, Methods of Water Conservancy takes pre grouting from the working face.Injected hole 22, 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 point 4 subsection slip castings, partitioning standards determines 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 order is treat that a segmentation reaches slip casting ending standard, then drills from aperture and extend to next section high.
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 cement 2830t altogether, pollopas 110t.Every meter of pit shaft cement 16t, pollopas 0.7t.
Shaft excavation has no water burst, and achieve and beat dry-well, and strengthen pit shaft country rock, achieving good economic benefit and social benefit, is harnessing the river of similar projects, provides successful New technical use example.
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, be Jurassic system and Permian System in-647 ~-770m section (thickness 123m), be made up of sepia, canescence siltstone, packsand, middle sandstone, gritstone, mud stone, basal water is middle sandstone, gritstone, water barrier is siltstone, mud stone, and aquifer and water barrier are alternating layers shapes, bore flooding quantity 26.6m3/h, estimate inflow of water 70m3/h, Methods of Water Conservancy takes pre grouting from the working face.Injected hole 16, 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, partitioning standards determines with lithology and bore flooding quantity size, and boring injecting method is treat that a segmentation reaches slip casting ending standard, then drills from aperture and extend to next section high.
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 cement 1200t altogether, pollopas 730T.Every meter of pit shaft cement 9.77t, pollopas 5.93t.
Shaft excavation water yield is less than 2m3/h, reaches slip casting desired effect, and strengthens pit shaft country rock, achieves good economic benefit and social benefit, is harnessing the river of similar projects, provides successful New technical use example.
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: show native section degree of depth 231m, the Jurassic system degree of depth 231 ~ 765m, thick 534m, by variegated siltstone, mud stone and grey packsand, middle sandstone, forms containing gravel gritstone.High angle tiny crack is comparatively grown, loose containing hole, crack artesian water lithology, easy argillization.Stratigraphic dip 6 ° ~ 8 °, checks that boring 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.Grouting borehole design 35, point 2 circles are arranged, inner ring hole circle footpath φ 3.6m, hole count 15, and radial angle 5 °, drops 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, hole count 20, radial angle 2.5 °, drops on 3.2m, 155m outside waste footpath and drops on 5.6m outside waste footpath at the bottom of 100m location hole.Effect is shutoff pore water, crevice water.
Grouting pressure: grouting pressure be promote slurries in crack, flow of pore, diffusion filling, compacting power, be one of key factor controlling slurries diffusion length, 2-4 times that generally optionally descend hydrostatic pressure.Early stage, the larger crack of shutoff, got low value (2 times of hydrostatic pressure); Later stage, for rimala, hole, gets high level (3-4 of hydrostatic pressure doubly).
2. mortar depositing construction process and effect
Mortar depositing construction operation is: grout cover height of excavation section reach requirement → with umbrella bore to rock stratum, bottom carry out visit water (object verifies ceiling location and the water yield in aquifer, ensure to bury underground the quality of orifice tube) → above carry 3m to build wall large form → utilizations block wall large form and set up drilling machine platform → by rig and to be fixed on large form → to bury underground orifice tube and enter rock about 2m → bury underground drainage bucket and drainage layer → concreting and carry out grouting behind shaft or drift lining reinforcing to the grout cover top borehole wall during maintenance 7d() → beat relief hole → drainage layer and orifice tube reinforce → normally bores, note reaches designing requirement.
Main vertical shaft working surface pre-pouring grout engineering, terminates from grout cover construction on February 4th, 2011.Around the above 1.5m borehole wall of grout cover, be evenly arranged 6 relief holes, first to the borehole wall and grout cover consolidation grouting, prevent from slurries are altered and damage the borehole wall and grout cover by pressure, grouting pressure reaches 3 times of 23 Μ pa(hydrostatic pressures), the borehole wall, grout cover are safe and sound.。
Work plane 35 injected holes are divided into 3 groups, first group of hole 1#-15#, hole depth 50m, radial angle 5 °, constructs in advance, injects cement paste, the larger crack of main shutoff.Second group, the 3rd group amounts to 20 holes, point 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, radial angle 2.5 °.3rd group of hole is even numbers hole, 16#, 18#, 20#, 22#, 24#, 26# ... 34#, hole depth 155m, radial angle 2.5 °, the grouting pressure in each group hole successively improves, and then again sweeps out second group of hole (odd numbers hole), be extended deep to 155m, high pressure injects chemical pulp.
End March 30, total lever factor 45d, altogether cleaning bottom of hole 4 times, injection rate cement paste 2040t, chemical pulp 1227t, under each section of duration, water yield, grouting pressure arrange:
First group of hole, bore note 14 days-February 20 February on date, boring maximum flooding quantity 29m3/h is down to 7m3/h, and other each bore flooding quantities are down to the cleaning bottom of hole water yield before the slip casting of 7-5m3/h(second time) final grouting pressure 15 Μ pa.
21 days-March 1 February on date noted by second group of hole drill, 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.
2 days-March 14 March on date noted by 3rd group of hole drill, 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.
15 days-March 30 March on date noted by second group of odd numbers hole drill, and boring maximum flooding quantity 5m3/h is down to 1.5m3/h, final grouting pressure 24 Μ pa.
Inspection eye: the boring that rear borehole inspection of constructing first is constructed, second group of hole checks the water yield of first group of hole more than 50m, 3rd group of hole checks the water yield of second group of hole more than 100m, noting again until the 3rd group of hole reaches after bore flooding quantity is less than 2m3/h, 4th group of hole and former second group of hole depth are extended deep to 155m by former 100m, inject chemical pulp, reach single hole water yield and be less than 1.5m3/h.
Check slip casting effect after Shaft Excavation, pit shaft total yield 6m3/h, reaches sinking and drifting code requirement.
1. layout of holing is shown in 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. the descending slip casting method of the high many group aquifer segmentations of large section, is characterized in that: concrete steps are as follows:
1) injected hole is beaten; 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 used for shutoff pore water, crevice water; Adopt the high boring of large section; Drill employing hydraulic tunnel drilling machine, rate of penetration 10m/h, has the function of automatically unloading bar, hole depth 150m; Injected hole meets the high condition of boring note of large section;
2) in injected hole, Grouting Pipe is installed, 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 optionally descends the 2-4 of hydrostatic pressure doubly; In earlier stage the larger crack of shutoff, 2 times that get hydrostatic pressure; Later stage, for rimala, hole, gets the 3-4 of hydrostatic pressure doubly; 2/3 of the maximum pressure of described slurry filling machine need reach final pressure, prevents because long time running causes facility fault 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 of concrete and arrange a secondary agitator.
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CN107060767B (en) * 2017-05-25 2018-04-03 安徽理工大学 Deep vertical stratum consolidation filling system and its grouting method under existing wellbore conditions
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CN108119143B (en) * 2017-12-20 2019-11-15 湖南科技大学 A kind of vertical shaft working surface cement soluble glass paste combines grouting method with chemical grout double-round curtain
CN111365002B (en) * 2020-03-30 2021-07-30 北京中煤矿山工程有限公司 Ground pre-grouting method for small-section high wellbore in complex stratum
CN111550250A (en) * 2020-05-15 2020-08-18 陕西延长石油巴拉素煤业有限公司 Water prevention and control protection method for safe excavation of water-rich coal seam section of vertical shaft

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