CN102518450A - Method for grouting ordinary cement rather than ultra-fine cement when reinforcing stratum by adopting shallow excavation method - Google Patents
Method for grouting ordinary cement rather than ultra-fine cement when reinforcing stratum by adopting shallow excavation method Download PDFInfo
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Abstract
When the stratum is reinforced by adopting the shallow excavation method, the foundation needs to be grouted by the ordinary cement in the first time and the ultra-fine cement in the second time. According to a method for grouting ordinary cement rather than ultra-fine cement when reinforcing the stratum by adopting the shallow excavation method, during the supplement of the cement in the second time, the ordinary cement rather than the ultra-fine cement is grouted in order to improve soil, the silty clay in a certain range beyond the excavation contour is improved pertinently, and the safe excavation is ensured. The strength of the ordinary cement is equivalent to the strength of the ultra-fine cement. In addition, the engineering cost is saved, and good social and economic benefits are achieved.
Description
Technical field
What the present invention relates to the Construction of Civil Engineering use is being under the geological conditions of leading with mud; Adopt the auxiliary double pipe of TSS not have the slurries of contraction reinforcing technique; When secondary grouting, be a kind of method that injecting paste material is improved the soil with ordinary Portland cement, water glass, aluminate accelerating admixture, expansion agent, cellulose ether.
Background technology
At present, fracture grouting is most widely used a kind of grouting method in soft layer.In handling the mud engineering, be purpose through injecting slurries to improve the soil, strengthen soil strength.Slip casting is carried out at twice, and slip casting for the first time adopts ordinary Portland cement that soil layer is reinforced, and adopts superfine cement that it is carried out after-teeming for the second time and handles, thereby reach the purpose of reinforcing soil layer.
The present invention carries out physical and mechanical analysis through layer soil body over the ground, in conjunction with this engineering reality and field trial, with reference to the correlation engineering successful experience, when secondary grouting, adopts ordinary Portland cement to replace superfine cement that soil is carried out after-teeming to improve the soil.Through studying its each raw material properties, confirm in test best water/binder ratio, concentration of sodium silicate, injection speed and grouting pressure etc., thereby obtain optimum mix to satisfy the needs of engineering.Job practices is identical when adopting superfine cement; And construction back soil layer can reach the intensity when using the superfine cement after-teeming, but the price of superfine cement is higher than ordinary Portland cement far away, and price is its 3 times; When the shallow burial hidden digging stratum consolidation; Adopt ordinary Portland cement slip casting to replace the superfine cement grouting method, can good economical, societal benefits be arranged for a large amount of fund of engineering economy.
Summary of the invention
The purpose of this invention is to provide that a kind of what can be applied to civil engineering is being under the main geological conditions with mud; Adopt the auxiliary double pipe of TSS not have the slurries of contraction reinforcing technique; When secondary grouting, be a kind of method that injecting paste material is improved the soil with ordinary Portland cement, water glass, aluminate accelerating admixture, expansion agent, cellulose ether.
1, shallow burial hidden digging stratum consolidation of the present invention replaces the superfine cement grouting method with ordinary Portland cement slip casting when secondary grouting, it is characterized in that: the injecting paste material that is adopted is cement, water glass, water, aluminate accelerating admixture, expansion agent, cellulose ether with mass ratio 1: 0.3: 0.75: form at 0.01: 0.05: 0.003.
2, shallow burial hidden digging stratum consolidation ordinary Portland cement slip casting of the present invention replaces the superfine cement grouting method; It is characterized in that: the water glass that is adopted is a kind of inorganic bond; Main component is a silicate of soda, and its caking property is strong, acidproof, heat-resisting, usually in order to reinforce soil.
3, shallow burial hidden digging stratum consolidation ordinary Portland cement slip casting of the present invention replaces the superfine cement grouting method, and it is characterized in that: cement is the portland cement of label 32.5.
4, grouting method as claimed in claim 1 is characterized in that: the main component of the aluminate accelerating admixture that is adopted is sodium aluminate and potassium aluminate.
5, grouting method as claimed in claim 1, it is characterized in that: the cellulose ether that is adopted is a hydroxypropyl methyl cellulose ether, is a kind of water-soluble high-molecular material.
6, grouting method as claimed in claim 1 is characterized in that: the expansion agent that is adopted is low alkali U type cement expansive material.
7, shallow burial hidden digging stratum consolidation ordinary Portland cement slip casting of the present invention replaces the superfine cement grouting method, and it is characterized in that: the injection pressure of injecting paste material is during secondary grouting: annotate pressure=0.3-1.0Mpa in advance; After-teeming pressure=1.0-1.5Mpa.
8, shallow burial hidden digging stratum consolidation ordinary Portland cement slip casting of the present invention replaces the superfine cement grouting method, it is characterized in that: the injection rate of said injecting paste material (injects predetermined soil layer scope entoplasm liquid measure Q (m
3) and predetermined injection scope formation bulk volume V (m
3) ratio) confirm as 30%～50%.
9, shallow burial hidden digging stratum consolidation ordinary Portland cement slip casting of the present invention replaces the superfine cement grouting method; It is characterized in that: when secondary grouting, adopt the auxiliary double pipe of TSS not have and shrink two slurries reinforcing techniques; It is 14L/min that double pipe does not have the two slurries standard injection speeds of contraction, TSS Grouting Pipe biliquid slurry injection speed 16L/min.
Beneficial effect of the present invention:
When secondary grouting, be injecting paste material with ordinary Portland cement, water glass, aluminate accelerating admixture, expansion agent and cellulose ether, it is main adopting the double pipe rig not have the slurries of contraction reinforcing technique, it is the grouting method of assisting that the TSS Grouting Pipe does not have the reinforcing of the liquid of contraction slurry.Can guarantee after the reinforcing to excavate the firm of the face soil body, the mechanics index of physics on stratum is significantly improved, can control soil deformation effectively.The slurries preparation is simple, and easy to operate, temperature influence is not nontoxic, and is pollution-free to environment and river, and the mankind are not had much harms.Adopt ordinary Portland cement to replace superfine cement slip casting, not only intensity does not reduce, and the superfine cement gel time is long, is subject to underground water dilution influence, higher (8000 yuan/m of its cement paste cost
3About), be about 3 times of light water mud cost.Use ordinary Portland cement to replace superfine cement slip casting, reduced construction costs widely, have good economic benefit.
The specific embodiment
1. ordinary Portland cement slurries fundamental property
The ordinary Portland cement plasmoid humor is to be main with ordinary Portland cement; Add a certain amount of aluminate accelerating admixture, expansion agent and cellulose ether, the slurries that water is adjusted adopt biliquid slurry mode to inject rock-soil layer; Visible by table 1; Along with the increase of water/binder ratio, the compressive strength of cement paste has fairly obviously and reduces, and water/binder ratio to the compressive strength influence of slurries greatly.
Table 1 ordinary Portland cement is reinforced compressive strength
2. superfine cement slurries fundamental property
Superfine cement is that ordinary Portland cement reprocessing is levigate and get, and its chemical composition is consistent with the ordinary Portland cement composition, by table 2 it is thus clear that, along with the increase of water/binder ratio, the compressive strength that superfine cement is starched also is the downward trend of fairly obvious ground.
Table 2 superfine cement is reinforced compressive strength
Carried out shallow burial hidden digging on Hangzhou, Shanghai and other places when constructing in the past, and often adopted superfine cement slip casting for secondary grouting, because the muddy soft soil hole is minimum, its consolidation effect is worth inquiring into.Table 1,2 is the intensity laboratory test that ordinary Portland cement and superfine cement are reinforced passage mud stratum; Result of the test shows; Compare with superfine cement under the volume and ordinary Portland cement consolidation effect; Intensity is suitable, and the superfine cement gel time is long, is subject to higher (8000 yuan/m of underground water dilution influence and its cement paste cost of superfine cement
3About), be about 3 times of light water mud cost.So selected ordinary Portland cement, water glass, aluminate accelerating admixture, expansion agent, cellulose ether injecting paste material are as the main reinforcement material of secondary grouting.(like the pipeline below) adopts the extraordinary grouting agent of HSC to carry out stratum consolidation in special location, and strict control surface uplift is guaranteed pipeline safety.
Carried out grout coordinate ratio test under different concentration of sodium silicate, the water/binder ratio for further confirming on-the-spot injecting paste material proportioning, this project.
Table 3 cement-sodium silicate slurries calculus body compressive strength
Can obtain according to table 3:
(1) along with the cement paste water/binder ratio increases, slurries compressive strength reduces.Be 1 at water/binder ratio especially: 1-1.5: between 1, water/binder ratio is very big to the compressive strength influence of slurries.When water/binder ratio during greater than 1: 1, the compressive strength of slurries is less, does not satisfy requirement of engineering.
(2) along with the increase of water glass bulk concentration, slurries compressive strength reduces, and the water glass incorporation is crossed conference reduction soil strength.
In order to satisfy on-the-spot slip casting test property annotated and requirement of strength, finally confirm slurry water gray scale 0.8-1.2.
3. on-the-spot injection test:
According to indoor injecting paste material performance study and PRELIMINARY RESULTS, the injecting paste material of field trial is: ordinary Portland cement, water glass, aluminate accelerating admixture, expansion agent, cellulose ether, the moisture fine sand type of HSC grouting agent.Adopt the double pipe rig to carry out field trial to above-mentioned five kinds of injecting paste materials, under predetermined grouting pressure control, slurries are overcome in the hole of the various resistances infiltration soil bodys, the soil body is produced compaction effect; Adopting the form pressurization of moment splitting to produce splitting along the earth formation face in certain pressure limit flows, makes slurries further be the veiny form to the slit of splitting and flow; Slurries constantly form irregular calculus body after outwards expansion, diffusion, splitting, the densification gradually from the crack, solidify suction, increase the stratum compactness thereby reach, the purpose of reinforcing silt clay.
3.1 range of grouting
Consider that the passage periphery carries and excavation safety, according to survey report, it is 1.2Mpa that the fastening strength on stratum is recommended in design, and reinforcing scope is in passage and the outer 2m of periphery (substrate is 3m down).
3.2 injection pressure
Injection pressure is one of key factor of mortar depositing construction effect quality.About injection pressure,, improve injection pressure and can obtain effect preferably in that stratum, underground installation, contiguous structure are not had under the prerequisite of influence.Injection pressure not only by the decision of overburden soil thickness factor, is gone back factors such as considered ambient environmental conditions.
Field experiment is injected, and as slip casting time t=30min, grout spreading range and soil body compressive strength were shown in table 4, table 5 when grouting pressure was got 0.1～1.0MPa respectively:
Table 4 grout spreading range is with the change list of grouting pressure
Table 5 soil body compressive strength is with the change list of grouting pressure
Can be found out that by above form when secondary grouting, identical slip casting is during the time, grout spreading range and soil body compressive strength increase with the increase of grouting pressure, and the rate of rise of compressive strength is greater than the rate of rise of grout spreading range.Confirm that after analyzing injection pressure is: annotate pressure=0.3-1.0Mpa in advance; After-teeming pressure=1.0-1.5Mpa.
3.3 injection rate
Injection rate is to inject predetermined soil layer scope entoplasm liquid measure Q (m
3) and predetermined injection scope formation bulk volume V (m
3) ratio.The size of injection rate directly influences the degree of slurry consolidation deposits yields densification phenomenon.Injection rate can be represented with following formula:
λ＝Q/V＝na
λ wherein: injection rate (%); N: the clearance rate on stratum; A: filling rate (%).
Know that from practical experience mucky soil earth remains on 30% above injection rate, it is more obvious then to inject effect, so injection rate confirms as 30%～50%.
3.4 injection rate
Speed is low effective generally speaking, but normal conditions often need be taken into account effective utilization not have influence to stratum and contiguous structure factors such as injection pressure, economic benefit, take all factors into consideration injection rate, and specifically data are seen table 6, table 7:
Table 6TSS Grouting Pipe injection speed and diffusion radius relationship change list
Table 7 double pipe injection speed and diffusion radius relationship change list
Can find out by table 6, table 7, when secondary grouting, under the identical grouting pressure; Grout spreading range all increases with the growth of injection speed; But along with the increase of injection rate, growth trend is slowed down, so select suitable injection speed very important; Select double pipe not have shrinking two slurries standard injection speeds through analysis is 14L/min, TSS Grouting Pipe biliquid slurry injection speed 16L/min.
Can know by above experimental result:
(1) when secondary grouting; Adopting ordinary Portland cement, water glass, aluminate accelerating admixture, expansion agent, cellulose ether is injecting paste material and the contrast of superfine cement slurries improvement silt clay layer; Effect is more or less the same; But consider reasons such as construction costs, confirmed ordinary Portland cement, water glass, aluminate accelerating admixture, expansion agent, cellulose ether as the engineering injecting paste material, and confirmed optimum water/binder ratio and concentration of sodium silicate.(suggestion lists illustrates the tabulation that the cost that adopts 1 ton of injecting paste material of the present invention is compared with the cost of one ton of superfine cement slurries of the same effect that can reach improvement silt clay layer).
(2) ordinary Portland cement, water glass, aluminate accelerating admixture, expansion agent, cellulose ether injecting paste material disperse through high-speed stirred more fully, have improved the stability of slurries, guarantee the concrete castability on mud basis.Can guarantee after the reinforcing to excavate the firm of the face soil body, the mechanics index of physics on stratum is significantly improved, can control soil deformation effectively.
(3) the slurries preparation is simple, and easy to operate, temperature influence is not nontoxic, and is pollution-free to environment and river, and the mankind are not had much harms.Adopt ordinary Portland cement, water glass, aluminate accelerating admixture, expansion agent, cellulose ether injecting paste material, low price reduces engineering cost.
(4) injecting paste material is adjustable time of setting, can transfer to tens seconds, has shortened the intensity rising stage, can realize having annotated i.e. excavation, and can play effective sealing effect.Different according to the position, according to strong, the middle suitably principle of periphery, treat with a certain discrimination, guarantee that the soil body is firm, convenient as far as possible simultaneously excavation.
(5) under certain soil property and slurries character condition, change grouting pressure and injection speed and all can change slip casting effect, adjust the range of scatter of slurries and soil body compressive strength, but change speed difference to some extent.
Claims (9)
1. a shallow burial hidden digging stratum consolidation replaces the grouting method of superfine cement with ordinary Portland cement slip casting when secondary grouting, it is characterized in that: the injecting paste material that is adopted for by cement, water glass, water, aluminate accelerating admixture, expansion agent, cellulose ether with mass ratio 1: 0.3: 0.75: form at 0.01: 0.05: 0.003.
2. grouting method as claimed in claim 1 is characterized in that: the water glass that is adopted is a kind of inorganic bond, and main component is a silicate of soda, and its caking property is strong, acidproof, heat-resisting, in order to reinforce soil.
3. shallow burial hidden digging stratum consolidation ordinary Portland cement slip casting as claimed in claim 1 replaces the superfine cement grouting method, and it is characterized in that: cement is the portland cement of label 32.5.
4. grouting method as claimed in claim 1 is characterized in that: the main component of the aluminate accelerating admixture that is adopted is sodium aluminate and potassium aluminate.
5. grouting method as claimed in claim 1, it is characterized in that: the cellulose ether that is adopted is a hydroxypropyl methyl cellulose ether, is a kind of water-soluble high-molecular material.
6. grouting method as claimed in claim 1 is characterized in that: the expansion agent that is adopted is low alkali U type cement expansive material.
7. grouting method as claimed in claim 1 is characterized in that: the injection pressure of when secondary grouting, injecting said injecting paste material is: annotate pressure=0.3-1.0Mpa in advance; After-teeming pressure=1.0-1.5Mpa.
8. grouting method as claimed in claim 1 is characterized in that: the injection rate of said injecting paste material is 30%～50%, and said injection rate is for injecting predetermined soil layer scope entoplasm liquid measure Q (m
3) and predetermined injection scope formation bulk volume V (m
3) ratio.
9. grouting method as claimed in claim 1; It is characterized in that: when secondary grouting, adopt the auxiliary double pipe of TSS not have and shrink two slurries reinforcing techniques; It is 14L/min that double pipe does not have the two slurries standard injection speeds of contraction, TSS Grouting Pipe biliquid slurry injection speed 16L/min.
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| CN113901678A (en) * | 2021-12-10 | 2022-01-07 | 成都理工大学 | Evaluation device and evaluation method for condensation quality of cement slurry for engineering grouting |
| CN114292071A (en) * | 2022-01-10 | 2022-04-08 | 中国电建集团中南勘测设计研究院有限公司 | Quasi-colloidal slurry and preparation method thereof |
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| CN113901678A (en) * | 2021-12-10 | 2022-01-07 | 成都理工大学 | Evaluation device and evaluation method for condensation quality of cement slurry for engineering grouting |
| CN113901678B (en) * | 2021-12-10 | 2022-04-15 | 成都理工大学 | Evaluation device and evaluation method for condensation quality of cement slurry for engineering grouting |
| CN114292071A (en) * | 2022-01-10 | 2022-04-08 | 中国电建集团中南勘测设计研究院有限公司 | Quasi-colloidal slurry and preparation method thereof |
| CN114292071B (en) * | 2022-01-10 | 2023-02-24 | 中国电建集团中南勘测设计研究院有限公司 | Quasi-colloidal slurry and preparation method thereof |
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