CN105568961A - Hole forming method suitable for soft plastic red clay stratum pile foundation - Google Patents
Hole forming method suitable for soft plastic red clay stratum pile foundation Download PDFInfo
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- CN105568961A CN105568961A CN201510997998.1A CN201510997998A CN105568961A CN 105568961 A CN105568961 A CN 105568961A CN 201510997998 A CN201510997998 A CN 201510997998A CN 105568961 A CN105568961 A CN 105568961A
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- mud
- weighted mud
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- red clay
- hole
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 239000004927 clay Substances 0.000 title claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims abstract description 20
- 239000007788 liquid Substances 0.000 claims abstract description 19
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims abstract description 14
- 229920002907 Guar gum Polymers 0.000 claims abstract description 13
- 239000000665 guar gum Substances 0.000 claims abstract description 13
- 229960002154 guar gum Drugs 0.000 claims abstract description 13
- 235000010417 guar gum Nutrition 0.000 claims abstract description 13
- 238000005553 drilling Methods 0.000 claims abstract description 10
- 239000001103 potassium chloride Substances 0.000 claims abstract description 10
- 235000011164 potassium chloride Nutrition 0.000 claims abstract description 10
- 239000002689 soil Substances 0.000 claims description 20
- 238000000465 moulding Methods 0.000 claims description 9
- 238000005516 engineering process Methods 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- 239000011435 rock Substances 0.000 claims description 7
- 239000004575 stone Substances 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 230000002950 deficient Effects 0.000 claims description 4
- 238000005086 pumping Methods 0.000 claims description 4
- 238000011084 recovery Methods 0.000 claims description 4
- 230000003014 reinforcing effect Effects 0.000 claims description 4
- 239000013589 supplement Substances 0.000 claims description 4
- 238000012360 testing method Methods 0.000 claims description 4
- 238000007667 floating Methods 0.000 claims description 3
- 239000002002 slurry Substances 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 2
- 239000000440 bentonite Substances 0.000 abstract 1
- 229910000278 bentonite Inorganic materials 0.000 abstract 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 abstract 1
- 230000005484 gravity Effects 0.000 abstract 1
- 230000008595 infiltration Effects 0.000 abstract 1
- 238000001764 infiltration Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 238000005266 casting Methods 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 208000034189 Sclerosis Diseases 0.000 description 2
- 238000007596 consolidation process Methods 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 238000000280 densification Methods 0.000 description 2
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 2
- 229910052901 montmorillonite Inorganic materials 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 231100000241 scar Toxicity 0.000 description 2
- 210000000481 breast Anatomy 0.000 description 1
- 125000000837 carbohydrate group Chemical group 0.000 description 1
- 235000019994 cava Nutrition 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000010358 mechanical oscillation Effects 0.000 description 1
- 229920000344 molecularly imprinted polymer Polymers 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/36—Concrete or concrete-like piles cast in position ; Apparatus for making same making without use of mouldpipes or other moulds
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/14—Clay-containing compositions
- C09K8/18—Clay-containing compositions characterised by the organic compounds
- C09K8/20—Natural organic compounds or derivatives thereof, e.g. polysaccharides or lignin derivatives
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0037—Clays
- E02D2300/004—Bentonite or bentonite-like
- E02D2300/0043—Bentonite or bentonite-like with other ingredients
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Civil Engineering (AREA)
- Paleontology (AREA)
- General Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Dispersion Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Piles And Underground Anchors (AREA)
- Bulkheads Adapted To Foundation Construction (AREA)
Abstract
The invention discloses a pore-forming method suitable for a soft plastic red clay stratum pile foundation, which is characterized in that a drilling machine is drilled to meet the soft plastic red clay stratum, and weighted slurry formed by adding bentonite, barite powder, guar gum, potassium chloride and water is pumped into a pile hole to serve as a wall protecting material, wherein the weighted slurry has high water loss speed, so that a compact mud skin can be formed on the hole wall, and further infiltration of underground water into the hole pile is inhibited; meanwhile, the specific gravity of the weighted mud is larger, so that larger liquid column pressure can be generated, namely a liquid casing is sleeved outside the drilling machine to effectively support the wall section of the hole of the soft plastic red clay stratum, and the soft plastic red clay stratum is prevented from collapsing. The invention does not need to stop drilling in the process of drilling by the drilling machine, can shorten the operation time of drilling the pile foundation, and can recycle the slurry, thereby reducing the use cost. [ b ]
Description
Technical field
the present invention relates to and be a kind ofly applicable to the soft hole forming method moulding shape red clay stratum pile foundation, belong to the Pore-forming technology of pile foundation field in construction work.
Background technology
increasing along with west area infrastructure project, adopts the application of churning driven (drilled dry) hole creating technology to get more and more.Churning driven is in pore forming process, often bore to meet at covering layer and basement rock interface place and softly mould shape red clay stratum, this soft layer general thickness is little, but this weak soil interval very easily caves in, to collapse to hole and gradually upwards development collapse to earth's surface, there is pore-forming difficulty.Weak soil interval easily collapses and mainly there is the reason of the following aspects: one is that soft shear strength of moulding shape red clay self is extremely low; Two is the mechanical oscillation formed in hole stake digging process in stress release and pore-forming operation process; Three is that Soft Soil Layer is generally positioned at below phreatic line, and place exists the directionality seepage flow of underground water and the seepage effect inside and outside the stake holes wall of hole.Four is that red clay itself has expansion characteristics, forms the lateral expansion to free face after meeting water.
the soft hole forming method moulding shape red clay stratum pile foundation of current correspondence mainly contains following two kinds of methods:
one bores to meet this weak soil interval when collapsing, steel pile casting is entered under the section of collapsing, carry out packing to this section of collapsing and formed this hole wall section supporting, then the drill bit using little one-level size instead carries out creeping into of subsequently interval, subsequently interval occurs that Soft Soil Layer collapses again, the lower steel pile casting matched with bit size carries out supporting again, and the drill bit continuing to use instead little one-level size creeps into, until final pore-forming.This steel pile casting isolation method Problems existing is adopted to be: the steel pile casting in lower hand-hole stake cannot reclaim, cost is relatively high, on-the-spot lifting operation has certain difficulty, the general pile foundation construction time is comparatively nervous in addition, on-the-spot how better to prepare different size steel pile casting and drill bit be also an a kind of difficult problem.
another kind bores to meet this weak soil interval when collapsing, and to the concrete of the certain label of the section of collapsing pumping in the stake of hole, while hardening of concrete, also sclerosis hole stake soft layer sector hole wall, increases its intensity; After concrete strength acquires a certain degree, again enter down rig and drill this section concrete, continue creeping into of subsequently interval, subsequently interval occurs that Soft Soil Layer collapses again, can implement according to above-mentioned steps, until final pore-forming.This filling concrete method Problems existing is: one is need to reach after some strength until hardening of concrete to carry out drilling this section concrete again, the hardening of concrete time longer (general more than 12 hours), consuming time more; Two is that the concrete poured into generally is difficult to penetrate into inside hole stake soft layer, to the consolidation and sclerosis limited use that soft stratum hole wall section is formed, again drill the secondary often forming hole wall to cave in, thus usually need to carry out repeatedly penetration concrete and could form effective consolidation to soft layer hole wall, therefore ultimately increase time and cost.
Summary of the invention
the object of the invention is to, provide a kind of and be applicable to the soft hole forming method moulding shape red clay stratum pile foundation.The construction period is affected, the deficiency that cost is higher to solve existing method.
technical scheme of the present invention:
be applicable to the soft hole forming method moulding shape red clay stratum pile foundation, the method is constructed according to the following steps:
the first step, adopts rig at surface drilling, when be drilled into soft mould shape red clay top, stratum time, in stake holes, pump into weighted mud, weighted mud liquid level should be greater than underground water liquid level apart from bed rock stone apparent height apart from bed rock stone apparent height;
second step, continue boring after pumping into weighted mud, boring limit, limit supplements weighted mud, keeps weighted mud liquid level constant until pore-forming;
3rd step, puts into reinforcing cage, and pumps into concrete in stake holes, is held in the palm floating for weighted mud to concrete by concrete;
4th step, when the liquid level of weighted mud rises to right apart from aperture 2m, continues to inject concrete, while adopt pump suction skin weight mud, carries out recovery store weighted mud;
5th step, test weighted mud performance, can continue after indices is qualified to use in next hole; The defective mud of performance indications then carries out formula adjustment, until qualified for subsequent use.
in preceding method, described weighted mud be get 80-120 part water, 3-5 part swell soil, 80-120 part order number be 400 blanc fixe, 0.8-1.2 part guar gum and 0.4-0.6 part potassium chloride mix formulated.
in preceding method, described weighted mud be get 100 parts of water, 4 parts of swell soils, 100 parts of order numbers are that the blanc fixe of 400,1 part of guar gum and 0.5 part of potassium chloride mix formulated.
in preceding method, described weighted mud performance meets the instruction of following technology: proportion is 1.15g/cm3, and viscosity is 30s, and forming mudcake thickness formation speed is 0.5mm/30min, and fluid loss is 7ml/30min, and pH value is 8.5, and colloidity is 100%.
owing to have employed technique scheme, compared with prior art, the present invention bores without the need to stopping in rig pore forming process in the present invention, the pile foundation pore-forming activity duration can be shortened, this mud is recyclable simultaneously, reduces use cost, simultaneously formation and underground water pollution-free.。
Accompanying drawing explanation
fig. 1 is the schematic diagram that soft stratum sector hole wall generation side direction is caved in;
" networking " characteristic schematic diagram of Fig. 2 guar gum;
fig. 3 is weighted mud breast wall technology schematic diagram;
fig. 4 is weighted mud construction technology figure.
Detailed description of the invention
below in conjunction with drawings and Examples, the present invention is described in further detail, but not as any limitation of the invention.
of the present inventionly a kind ofly be applicable to the soft hole forming method moulding shape red clay stratum pile foundation, the method is constructed according to the following steps:
the first step, adopts rig at surface drilling, when be drilled into soft mould shape red clay top, stratum time, in stake holes, pump into weighted mud, weighted mud liquid level should be greater than underground water liquid level apart from bed rock stone apparent height apart from bed rock stone apparent height;
second step, continue boring after pumping into weighted mud, boring limit, limit supplements weighted mud, keeps weighted mud liquid level constant until pore-forming;
3rd step, puts into reinforcing cage, and pumps into concrete in stake holes, is held in the palm floating for weighted mud to concrete by concrete;
4th step, when the liquid level of weighted mud rises to apart from aperture about 2m, continues to inject concrete, while adopt pump suction skin weight mud, carries out recovery store weighted mud;
5th step, test weighted mud performance, can continue after indices is qualified to use in next hole; The defective mud of performance indications then carries out formula adjustment, until qualified for subsequent use.
in preceding method, described weighted mud be get 80-120 part water, 3-5 part swell soil, 80-120 part order number be 400 blanc fixe, 0.8-1.2 part guar gum and 0.4-0.6 part potassium chloride mix formulated.Optimum proportioning is 100 parts of water, 4 parts of swell soils, 100 parts of order numbers are that the blanc fixe of 400,1 part of guar gum and 0.5 part of potassium chloride mix formulated.The finished product be mixed with is milky viscous liquid, and its performance meets the instruction of following technology: proportion is 1.15g/cm3, and viscosity is 30s, and forming mudcake thickness formation speed is 0.5mm/30min, and fluid loss is 7ml/30min, and pH value is 8.5, and colloidity is 100%.
Embodiment
the method of this example is mainly moulded for stream as shown in Figure 1 or the pile foundation hole forming method on soft plastic state red clay stratum, in Fig. 1, arrow represents the flow direction of underground water, as seen from Figure 1, stake holes be drilled into stream mould or soft plastic state red clay layer time, under the effect of underground water, stream mould or soft plastic state red clay layer to bulging in hole wall, be tending towards collapsed position.The method of this example bores to meet at rig softly to mould shape red clay stratum, pump in stake holes and add weighted mud that swell soil, blanc fixe, guar gum and potassium chloride and water forms as retaining wall material, this weighted mud dehydrating speed can form a kind of mud skin of densification soon at hole wall, suppress underground water to infiltrating further in the stake of hole; Simultaneously because weighted mud proportion is comparatively large, larger head of liquid can be produced, be equivalent to have soft the mould shape red clay stratum hole wall section of a kind of liquid sleeve pipe to weakness to form effective support at rig overcoat, prevent soft shape red clay stratum of moulding from collapsing.
the Action Specification of each composition in weighted mud:
(1) water: be mud configuration agent.
(2) blanc fixe (BaSO4).Blanc fixe is mainly magcobar.As shown in Figure 4, blanc fixe makes mud balance obviously increase, increase the head of liquid of mud, and then active balance strata pressure, hole wall after counter stress release shrinks and can form effective support, stratum water pressure can be balanced simultaneously, reduce stratum underground water to the osmosis in the stake of hole, thus be conducive to the wall stability of weak soil interval.
(3) guar gum.Guar gum is carbohydrate high molecular polymer, has and puies forward sticky effect preferably, significantly can increase the viscosity of mud, can improve dispersiveness and the suspension effect of blanc fixe, improve the colloidal property of mud system.Guar gum can combine with swell soil simultaneously, and one is form the effective shutoff to pile foundation hole wall minute fissure, and two is the intensity that the guar gum Molecularly Imprinted Polymer net structure be embedded in hole wall can improve soft soil, and then improves the stability of hole wall.As shown in Figure 2.
(4) swell soil, form the mud skin of smooth densification in pile lining face, hole after swell soil dehydration, effectively can reduce the continuation dehydration of mud to soft layer sector hole wall, the contact of underground water in mud and stratum in effective plugging hole stake, and then suppress the expansion effect of hole wall red clay.
(5) potassium chloride is the swelling inhibitor of admaic earth.Because the expansion characteristics of admaic earth is mainly owing to containing a certain proportion of montmorillonite in its composition, the height of its content directly has influence on the lateral expansion of soft layer sector hole wall and complexity of caving in.Potassium chloride can form the inhibitory action expanded to montmorillonite, and then suppresses the lateral expansion of soft layer sector hole wall and cave in.
this example is implemented according to the following steps:
(1), after rig pore-forming to soft layer top, a certain amount of weighted mud is pumped into;
(2) adopt rig to continue pore-forming, and supplement mud gradually, keep mud constant from the height in aperture, until pore-forming; (see in Fig. 4 a)
(3) transfer reinforcing cage, and pump into concrete, concrete by lift-off for weighted mud to its top;
(4) arrive close to aperture about 2m, continue to inject concrete, while adopt pump suction top layer mud, carry out recovery and store; (b see in Fig. 4)
(5) test mud property, can continue after indices is qualified to use in next hole; The defective mud of performance indications then carries out formula adjustment, until qualified.
weighted mud liquid level can be calculated as follows:
wherein: h
1
-weighted mud is apart from underliing scar height;
h
2
-groundwater table is apart from underliing scar height;
γ
1
-weighted mud proportion;
γ
2
-underground water proportion;
k
0
-softly mould shape red clay layer static lateral pressure coefficient;
γ
i
-the i-th layer of native proportion;
h
i
-the i-th layer of soil thickness;
slurry consumption can be calculated as follows:
d-hole stake diameter.
Claims (4)
1. be applicable to the soft hole forming method moulding shape red clay stratum pile foundation, it is characterized in that: the method is constructed according to the following steps:
The first step, adopts rig at surface drilling, when be drilled into soft mould shape red clay top, stratum time, in stake holes, pump into weighted mud, weighted mud liquid level should be greater than underground water liquid level apart from bed rock stone apparent height apart from bed rock stone apparent height;
Second step, continue boring after pumping into weighted mud, boring limit, limit supplements weighted mud, keeps weighted mud liquid level constant until pore-forming;
3rd step, puts into reinforcing cage, and pumps into concrete in stake holes, is held in the palm floating for weighted mud to concrete by concrete;
4th step, when the liquid level of weighted mud rises to right apart from aperture 2m, continues to inject concrete, while adopt pump suction skin weight mud, carries out recovery store weighted mud;
5th step, test weighted mud performance, can continue after indices is qualified to use in next hole; The defective mud of performance indications then carries out formula adjustment, until qualified for subsequent use.
2. method according to claim 1, is characterized in that: described weighted mud be get 80-120 part water, 3-5 part swell soil, 80-120 part order number be 400 blanc fixe, 0.8-1.2 part guar gum and 0.4-0.6 part potassium chloride mix formulated.
3. method according to claim 2, is characterized in that: described weighted mud be get 100 parts of water, 4 parts of swell soils, 100 parts of order numbers are that the blanc fixe of 400,1 part of guar gum and 0.5 part of potassium chloride mix formulated.
4. method according to claim 1, is characterized in that: described weighted mud performance meets the instruction of following technology: proportion is 1.15g/cm3, and viscosity is 30s, formation mudcake thickness is 0.2mm/30min, fluid loss is 7ml/30min, and pH value is 8.5, and colloidity is 100%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510997998.1A CN105568961B (en) | 2015-12-28 | 2015-12-28 | Hole forming method suitable for soft plastic red clay stratum pile foundation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510997998.1A CN105568961B (en) | 2015-12-28 | 2015-12-28 | Hole forming method suitable for soft plastic red clay stratum pile foundation |
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| CN105568961A true CN105568961A (en) | 2016-05-11 |
| CN105568961B CN105568961B (en) | 2017-08-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108467715A (en) * | 2018-04-16 | 2018-08-31 | 浙江华东建设工程有限公司 | Low solids mud and preparation method thereof, boring method |
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| CN105568961B (en) | 2017-08-22 |
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