CN102731035A - Thixotropic shield backfill grouting slurry - Google Patents
Thixotropic shield backfill grouting slurry Download PDFInfo
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- CN102731035A CN102731035A CN201210239303XA CN201210239303A CN102731035A CN 102731035 A CN102731035 A CN 102731035A CN 201210239303X A CN201210239303X A CN 201210239303XA CN 201210239303 A CN201210239303 A CN 201210239303A CN 102731035 A CN102731035 A CN 102731035A
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- shield
- slurries
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- thixotropy
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Abstract
The invention discloses a thixotropic shield backfill grouting slurry, comprising the following components by weight percentage: 16-30% of cementitious material, 1.8-3.6% of bentonite, 50-65% of sand, 17-22% of water, 0.19-0.50% of water reducer, and 0.01-0.50% of thixotropic lubricant. The thixotropic shield backfill grouting slurry has better thixotropy; after being grouted into a shield tail gap, the flow yield strength of the slurry is large enough and the slurry hardly flows; however, under the condition of high-speed flowing or stirring, the slurry has excellent flowability, thereby avoiding pipe blockage.
Description
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Technical field
The invention belongs to underground works novel material development technique field, what relate generally to is a kind of thixotropy slurries that usefulness is filled in shield structure shield tail space that are applied to.
Background technology
Filling the employed method in shield tail space in the present domestic shield construction is the grouting behind shaft or drift lining technology, in the construction slush pump that makes is mixed at the scene and is delivered in the shield tail space.In the construction of present shield tunnel, what generally adopt is rigid single liquid slurry, and its staple is cement, flyash, wilkinite, sand, water, water reducer.This slurry consolidation sclerosis back intensity reaches characteristics such as with low cost greatly, in the construction of the shield tunnel in the soft soil layer, has played good effect at home.In order to satisfy construction requirement, slurries initial stage flowability is bigger usually.Some cities, China south often run into the stratum that decayed rack etc. has stronger self-stable ability relatively in the construction of shield tunnel; Cause the shield shell with contact between the weathered rock on every side not tight; Injecting rigid single liquid slurry can be along the loss of shield shell to the excavation face; Promptly so-called " scurrying slurry " causes that shield tail secretion is discontented, ground settlement is excessive.General solution is to inject the biliquid slurry at a distance from ring back, some sections of jurisdiction, and quick blocking rear slurry stream is to the passage of shield tunneling face, and the single liquid slurry of after-teeming is carried out in shield tail space between the biliquid slurry of sealing then.But there is the shortcoming that management is difficult, cost is high in this method in construction, particularly because plugging takes place in the process of pumping biliquid slurry too fast characteristics of presetting period easily.
Summary of the invention
Goal of the invention: in order to overcome the deficiency that exists in the prior art, the invention provides a kind of thixotropy shield structure grouting behind shaft or drift lining liquid, carrying out preventing when fill in shield structure shield tail space that slurries plugging, slurries run off, and the requirement that reduces the shield tunnel come-up.
Technical scheme: for solving the problems of the technologies described above, the present invention adopts following technical scheme: a kind of thixotropy shield structure grouting behind shaft or drift lining liquid, comprise following each component, and wherein the shared weight percent of each component is respectively:
Gelling material 16%～30%;
Wilkinite 1.8%～3.6%;
Sand 50%～65%;
Water 17%～22%;
Water reducer 0.19%～0.50%;
Thixotroping lubricant 0.01%～0.50%.
As preferably, said gelling material is made up of cement and flyash, and its mass percent is 1～3:3～8.
As preferably, said thixotroping lubricant is a kind of in positive colloid or the neusilin mineral coagulant or both mixtures.
Beneficial effect: compared with prior art, the present invention has the following advantages: have better thixotropy, the mobile ys of injecting shield tail space rear slurry is enough big, slurries flow hardly.But under flow at high speed or condition of stirring, slurries have good flowability again, and plugging does not take place.
Embodiment
Below in conjunction with embodiment the present invention is done explanation further.
Thixotropy shield structure grouting behind shaft or drift lining liquid of the present invention is in common rigid single liquid slurry, to add a small amount of thixotroping lubricant, with each component mixing and stirring.
Embodiment 1
Each component of the present invention mixes by following weight percent and forms:
Gelling material 24.3%
Wilkinite 2.8%
Sand 53.9%
Water 18.6%
Water reducer 0.38%
Positive colloid 0.02%,
Above-mentioned gelling material is made up of cement and flyash, and the weight ratio between them is a cement: flyash=1: 3.
The mobile ys of slurries after leaving standstill two hours of mixing system according to this proportioning can reach 900Pa, and after stirring through 30 seconds, mobile ys drops to 150Pa, and the slurries after the stirring are got back to more than the 800Pa through intensity after 20 minutes again.Can satisfy in the construction that not plugging of slurries is reached the needs that do not run off along the shield shell, and slurries are cheap.
Embodiment 2
Each component of the present invention mixes by following weight percent and forms:
Gelling material 24.3%
Wilkinite 2.3%
Sand 53.9%
Water 18.6%
Water reducer 0.4%
Neusilin mineral coagulant 0.5%,
Above-mentioned gelling material is by cement and flyash, and the weight ratio between them is a cement: flyash=1: 3.
The mobile ys of slurries after leaving standstill two hours of mixing system according to this proportioning can reach 750Pa, and after stirring through 30 seconds, mobile ys drops to 100Pa, and the slurries after the stirring are got back to more than the 650Pa through intensity after 20 minutes again.Can satisfy in the construction not plugging of slurries is reached the needs that do not run off along the shield shell.And slurries are cheap.
Embodiment 3
Each component of the present invention mixes by following weight percent and forms:
Gelling material 24.3%
Wilkinite 2.3%
Sand 53.9%
Water 18.6%
Water reducer 0.4%
Neusilin mineral coagulant 0.48%
Positive colloid 0.02%,
Above-mentioned gelling material is by cement and flyash, and the weight ratio between them is a cement: flyash=1: 3.
The mobile ys of slurries after leaving standstill two hours of mixing system according to this proportioning can reach 1050Pa, and after stirring through 30 seconds, mobile ys drops to 150Pa, and the slurries after the stirring are got back to more than the 900Pa through intensity after 20 minutes again.Can satisfy in the construction not plugging of slurries is reached the needs that do not run off along the shield shell.And slurries are cheap.
It mainly is to introduce the interior particle formation aspect fast and the end face bonded card palace formula network structure of slurries of thixotroping lubricant that shield structure grouting behind shaft or drift lining slurries produce thixotropic mechanism; It is high and stablize to constitute when leaving standstill shear yield strength, imposes when shearing external force the shear yield strength thixotroping system of reduction rapidly.The thixotropy slurries that the present invention claimed can be implemented in and prevent slurries plugging and the requirement of running off along the shield shell in the construction of shield structure grouting behind shaft or drift lining.And the material that slurries adopted has wide material sources, cheap characteristics, is convenient to the realization of site operation.
In shield structure grouting behind shaft or drift lining slurries, add a certain proportion of thixotroping lubricant; The interior particle of slurries of introducing the thixotroping lubricant forms aspect and end face bonded card palace formula network structure fast; The ys that flows when formation leaves standstill is high and stablize the ys that flows after stirring when the imposing shearing external force thixotroping system of reduction rapidly.It has following characteristics: (1) slurries can reach more than the 800Pa in the mobile ys of mixing after making and leave standstill 1 hour; (2) slurries mix make and leave standstill 1 hour after through quick stirring, its mobile ys is reduced to below the 200Pa significantly; (3) slurries left standstill after shear fracture 20 minutes, and its mobile ys can return to the intensity level before not stirring fast.This slurries can be adjusted the size of the shearing resistance value of slurries according to the concrete needs of construction, before pumping, stir fast, and the mobile ys of slurries reduces significantly, can plugging.After in being injected into shield structure shield tail space, the mobile ys of slurries can return to higher value again gradually, can prevent effectively that slurries run off along shield shell side in face of excavation.
The undeclared part that relates among the present invention is identical with prior art or adopt prior art to realize.The above only is a preferred implementation of the present invention; Be noted that for those skilled in the art; Under the prerequisite that does not break away from the principle of the invention, can also make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.
Claims (3)
1. a thixotropy shield structure grouting behind shaft or drift lining liquid is characterized in that comprising following each component, and wherein the shared weight percent of each component is respectively:
Gelling material 16%～30%;
Wilkinite 1.8%～3.6%;
Sand 50%～65%;
Water 17%～22%;
Water reducer 0.19%～0.50%;
Thixotroping lubricant 0.01%～0.50%.
2. according to the said thixotropy shield of claim 1 structure grouting behind shaft or drift lining liquid, it is characterized in that: said gelling material is made up of cement and flyash, and its mass percent is 1～3:3～8.
3. according to claim 1 or 2 said thixotropy shield structure grouting behind shaft or drift lining liquid, it is characterized in that: said thixotroping lubricant is a kind of in positive colloid or the neusilin mineral coagulant or both mixtures.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210239303XA CN102731035A (en) | 2012-07-12 | 2012-07-12 | Thixotropic shield backfill grouting slurry |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210239303XA CN102731035A (en) | 2012-07-12 | 2012-07-12 | Thixotropic shield backfill grouting slurry |
Publications (1)
| Publication Number | Publication Date |
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| CN102731035A true CN102731035A (en) | 2012-10-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201210239303XA Pending CN102731035A (en) | 2012-07-12 | 2012-07-12 | Thixotropic shield backfill grouting slurry |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107986711A (en) * | 2017-12-13 | 2018-05-04 | 中国水利水电第十工程局有限公司 | A kind of injection slurry applied to duct pieces of shield tunnel anti-floating and preparation method thereof |
| CN108751873A (en) * | 2018-08-13 | 2018-11-06 | 河南省建筑科学研究院有限公司 | The shield machine synchronous grouting material and preparation method thereof of fine powder is recycled containing building waste |
| CN111072347A (en) * | 2019-12-23 | 2020-04-28 | 河海大学 | Method for preparing backfill grouting material by utilizing waste amphibole muck in earth pressure shield |
| CN111099858A (en) * | 2020-01-14 | 2020-05-05 | 西京学院 | Engineering slurry with flowability adjustable along with shear rate, and preparation method and application thereof |
| CN112354108A (en) * | 2020-09-30 | 2021-02-12 | 中国矿业大学 | Mine fire prevention and extinguishing gel material and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1563672A (en) * | 2004-04-02 | 2005-01-12 | 上海第二市政工程有限公司 | PMS sludge prepn. method and its application in construction of sludge balance shield and pipe-jacking |
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2012
- 2012-07-12 CN CN201210239303XA patent/CN102731035A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1563672A (en) * | 2004-04-02 | 2005-01-12 | 上海第二市政工程有限公司 | PMS sludge prepn. method and its application in construction of sludge balance shield and pipe-jacking |
Non-Patent Citations (2)
| Title |
|---|
| 张林绪 等: "塑性注浆料实验研究及其应用", 《应用科技》 * |
| 范昭平 等: "盾构隧道壁后注浆浆体变形特性", 《土木建筑与环境工程》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107986711A (en) * | 2017-12-13 | 2018-05-04 | 中国水利水电第十工程局有限公司 | A kind of injection slurry applied to duct pieces of shield tunnel anti-floating and preparation method thereof |
| CN108751873A (en) * | 2018-08-13 | 2018-11-06 | 河南省建筑科学研究院有限公司 | The shield machine synchronous grouting material and preparation method thereof of fine powder is recycled containing building waste |
| CN111072347A (en) * | 2019-12-23 | 2020-04-28 | 河海大学 | Method for preparing backfill grouting material by utilizing waste amphibole muck in earth pressure shield |
| CN111072347B (en) * | 2019-12-23 | 2021-04-09 | 河海大学 | Method for preparing backfill grouting material by utilizing waste amphibole muck in earth pressure shield |
| CN111099858A (en) * | 2020-01-14 | 2020-05-05 | 西京学院 | Engineering slurry with flowability adjustable along with shear rate, and preparation method and application thereof |
| CN112354108A (en) * | 2020-09-30 | 2021-02-12 | 中国矿业大学 | Mine fire prevention and extinguishing gel material and preparation method thereof |
| CN112354108B (en) * | 2020-09-30 | 2021-12-21 | 中国矿业大学 | Mine fire prevention and extinguishing gel material and preparation method thereof |
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Application publication date: 20121017 |