CN102518450B - 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
The present invention relates to that Construction of Civil Engineering uses taking mud under main geological conditions, adopt the auxiliary double pipe of TSS without shrinking slurries reinforcing technique, in the time of secondary grouting, a kind of method of improvement soil taking ordinary Portland cement, water glass, aluminate accelerating admixture, expansion agent, cellulose ether as injecting paste material.
Background technology
At present, fracture grouting is most widely used a kind of grouting method in soft layer.Processing in mud engineering, by injecting slurries taking improvement soil as object, strengthen soil strength.Slip casting is carried out at twice, and slip casting for the first time adopts ordinary Portland cement to reinforce soil layer, adopts for the second time superfine cement to carry out after-teeming processing to it, thereby reaches the object of reinforcing soil layer.
The present invention carries out physical and mechanical analysis by layer soil body over the ground, in conjunction with this engineering reality and field trial, with reference to correlation engineering successful experience, in the time of secondary grouting, adopts ordinary Portland cement to replace superfine cement to carry out after-teeming with improvement soil to soil.By studying the character of its each raw material, determine in test best water/binder ratio, concentration of sodium silicate, injection speed and grouting pressure etc., thereby obtain optimum mix to meet the needs of engineering.Construction method with adopt when superfine cement identical, and after construction, soil layer can reach the intensity while using superfine cement after-teeming, but the price of superfine cement is far away higher than ordinary Portland cement, price is its 3 times, in the time of shallow burial hidden digging stratum consolidation, adopting ordinary Portland cement slip casting to replace superfine cement grouting method, can be a large amount of fund of engineering economy, has good economical, societal benefits.
Summary of the invention
The object of this invention is to provide a kind of can be applied to civil engineering taking mud under main geological conditions, adopt the auxiliary double pipe of TSS without shrinking slurries reinforcing technique, in the time of secondary grouting, a kind of method of improvement soil taking ordinary Portland cement, water glass, aluminate accelerating admixture, expansion agent, cellulose ether as injecting paste material.
1, shallow burial hidden digging stratum consolidation of the present invention replaces superfine cement grouting method with ordinary Portland cement slip casting in the time of secondary grouting, it is characterized in that: the injecting paste material adopting is cement, water glass, water, aluminate accelerating admixture, expansion agent, cellulose ether with mass ratio 1: 0.3: 0.75: 0.01: 0.05: 0.003 composition.
2, shallow burial hidden digging stratum consolidation ordinary Portland cement slip casting of the present invention replaces superfine cement grouting method, it is characterized in that: the water glass adopting is a kind of inorganic bond, main component is silicate of soda, and its caking property is strong, acidproof, heat-resisting, conventionally in order to reinforce soil.
3, shallow burial hidden digging stratum consolidation ordinary Portland cement slip casting of the present invention replaces superfine cement grouting method, it is characterized in that: cement is the portland cement of label 32.5.
4, shallow burial hidden digging stratum consolidation ordinary Portland cement slip casting of the present invention replaces superfine cement grouting method, it is characterized in that: the main component of the aluminate accelerating admixture adopting is sodium aluminate and potassium aluminate.
5, shallow burial hidden digging stratum consolidation ordinary Portland cement slip casting of the present invention replaces superfine cement grouting method, it is characterized in that: the cellulose ether adopting is hydroxypropyl methyl cellulose ether, and be a kind of water-soluble high-molecular material.
6, shallow burial hidden digging stratum consolidation ordinary Portland cement slip casting of the present invention replaces superfine cement grouting method, it is characterized in that: the expansion agent adopting is the U-shaped cement expansive material of low alkali.
7, shallow burial hidden digging stratum consolidation ordinary Portland cement slip casting of the present invention replaces superfine cement grouting method, it is characterized in that: when secondary grouting, the injection pressure of injecting paste material is: note in advance pressure=0.3-1.0Mpa; After-teeming pressure=1.0-1.5Mpa.
8, shallow burial hidden digging stratum consolidation ordinary Portland cement slip casting of the present invention replaces superfine cement grouting method, it is characterized in that: the injection rate of described 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) be defined as 30%～50%.
9, shallow burial hidden digging stratum consolidation ordinary Portland cement slip casting of the present invention replaces superfine cement grouting method, it is characterized in that: in the time of secondary grouting, adopt the auxiliary double pipe of TSS without shrinking two slurries reinforcing techniques, double pipe is 14L/min without shrinking two slurries standard injection speeds, TSS Grouting Pipe biliquid slurry injection speed 16L/min.
Beneficial effect of the present invention:
In the time of secondary grouting, taking ordinary Portland cement, water glass, aluminate accelerating admixture, expansion agent and cellulose ether as injecting paste material, adopting double pipe rig is main without shrinking slurries reinforcing technique, and TSS Grouting Pipe is auxiliary grouting method without shrinking the reinforcing of liquid slurry.After reinforcing, can ensure the firm of the excavation face soil body, the mechanics index of physics on stratum is significantly improved, can effectively control soil deformation.Slurries preparations is simple, easy to operate, and not temperature influence is nontoxic, pollution-free to environment and river, to the mankind without much harms.Adopt ordinary Portland cement to replace superfine cement slip casting, not only intensity does not reduce, and superfine cement gel time is long, is subject to underground water dilution impact, and its cement paste cost is higher (8000 yuan/m
3left and right), be 3 times of left and right of light water mud cost.Use ordinary Portland cement to replace superfine cement slip casting, reduced widely construction costs, there is good economic benefit.
Detailed description of the invention
1. ordinary Portland cement slurries fundamental property
Ordinary Portland cement plasmoid humor is taking ordinary Portland cement as main, 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, from table 1, along with the increase of water/binder ratio, the compressive strength of cement paste has obviously reduction, and water/binder ratio on the compressive strength impact 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 is reprocessed levigate and obtains, and its chemical composition is consistent with ordinary Portland cement composition, and from table 2, along with the increase of water/binder ratio, the compressive strength of superfine cement slurry is also obviously downward trend.
Table 2 superfine cement is reinforced compressive strength
Carried out shallow burial hidden digging on the ground such as Hangzhou, Shanghai while constructing in the past, and often adopted superfine cement slip casting for secondary grouting, because 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 Ground, result of the test shows, with superfine cement under volume and the comparison of ordinary Portland cement consolidation effect, intensity is suitable, and superfine cement gel time is long, be subject to underground water dilution impact and its cement paste cost of superfine cement higher (8000 yuan/m
3left and right), be 3 times of left and right of light water mud cost.Therefore 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.In special location, (as pipeline below) adopts HSC special-type grouting material to carry out stratum consolidation, strictly controls surface uplift, guarantees pipeline safety.
Carry out grout coordinate ratio test under different concentration of sodium silicate, water/binder ratio for further determining 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 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 on the compressive strength impact of slurries greatly.In the time that water/binder ratio is greater than 1: 1, the compressive strength of slurries is less, does not meet requirement of engineering.
(2) along with the increase of water glass bulk concentration, slurries compressive strength reduces, and water glass incorporation is crossed conference reduction soil strength.
In order to meet the on-the-spot grouting test property noted and requirement of strength, finally determine 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 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 to compaction effect; Adopting the form pressurization of moment splitting to produce splitting along earth formation face in certain pressure limit flows, makes slurries further be veiny form to the gap of splitting and flow; Slurries constantly form gradually irregular calculus body from crack to external expansion, diffusion, splitting, densification, solidify water suction, increase stratum compactness, the object of reinforcing silt clay thereby reach.
3.1 range of grouting
Consider the carrying of passage periphery 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 the outer 2m of passage and periphery (being 3m under substrate).
3.2 injection pressure
Injection pressure is one of key factor of mortar depositing construction effect quality.About injection pressure, stratum, underground installation, contiguous structure are not had under influential prerequisite, improve injection pressure and can obtain good effect.Injection pressure is not only determined by overburden soil thickness factor, also should consider the factors such as ambient environmental conditions.
Field experiment is injected, and as slip casting time t=30min, when grouting pressure is got 0.1～1.0MPa respectively, grout spreading range and soil body compressive strength are as shown in table 4, table 5:
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
As can be seen from the above table, in the time of secondary grouting, when the identical slip casting 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.Determine afterwards that by analysis injection pressure is: note in advance pressure=0.3-1.0Mpa; 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 affects the degree of slurry consolidation deposits yields densification phenomenon.Injection rate can be represented by the formula:
λ=Q／V=na
Wherein λ: injection rate (%); N: the clearance rate on stratum; A: filling rate (%).
Know from practical experience, Muddy Bottoms soil remains on 30% above injection rate, injects effect more obvious, therefore injection rate is defined as 30%～50%.
3.4 injection rate
Generally speed is low effective, but normal conditions often need to take into account effective utilization stratum and contiguous structure are not had to the factors such as influential injection pressure, economic benefit, consider injection rate, and concrete data are in 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 be found out by table 6, table 7, in the time of secondary grouting, under identical grouting pressure, grout spreading range all increases with the growth of injection speed, but along with the increase of injection rate, growth trend slows down, so select suitable injection speed very important, selecting by analysis double pipe is 14L/min without shrinking two slurries standard injection speeds, TSS Grouting Pipe biliquid slurry injection speed 16L/min.
From above experimental result:
(1) in the time of 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 the reasons such as construction costs, determine that ordinary Portland cement, water glass, aluminate accelerating admixture, expansion agent, cellulose ether are as engineering injecting paste material, and determined optimum water/binder ratio and concentration of sodium silicate.(suggestion lists the cost that adopts 1 ton of injecting paste material of the present invention is shown and can reaches the cost of one ton of superfine cement slurries of same effect of improvement silt clay layer compared with list).
(2) ordinary Portland cement, water glass, aluminate accelerating admixture, expansion agent, cellulose ether injecting paste material, through high-speed stirred, disperse more fully, have improved the stability of slurries, guarantee the concrete castability on mud basis.After reinforcing, can ensure the firm of the excavation face soil body, the mechanics index of physics on stratum is significantly improved, can effectively control soil deformation.
(3) slurries preparations is simple, easy to operate, and not temperature influence is nontoxic, pollution-free to environment and river, to the mankind without 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 be adjusted to tens seconds, has shortened the intensity rising stage, can realize and note i.e. excavation, and can play effective sealing effect.According to position difference, according to strong, the middle principle of moderation of periphery, treat with a certain discrimination, ensure that the soil body is firm, simultaneously convenient as far as possible 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 to soil body compressive strength, but change speed difference to some extent.
Claims (3)
1. a shallow burial hidden digging stratum consolidation uses ordinary Portland cement slip casting to replace the grouting method of superfine cement in the time of secondary grouting, it is characterized in that: the injecting paste material adopting 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, the main component of the aluminate accelerating admixture adopting is sodium aluminate and potassium aluminate, the cellulose ether adopting is hydroxypropyl methyl cellulose ether, and the expansion agent adopting is the U-shaped cement expansive material of low alkali; The injection pressure of injecting described injecting paste material in the time of secondary grouting is: note in advance pressure=0.3-1.0Mpa; After-teeming pressure=1.0-1.5Mpa, the injection rate of described injecting paste material is 30%～50%, described 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, in the time of secondary grouting, adopt the auxiliary double pipe of TSS without shrinking two slurries reinforcing techniques, double pipe is 14L/min without shrinking two slurries standard injection speeds, TSS Grouting Pipe biliquid slurry injection speed 16L/min.
2. grouting method as claimed in claim 1, is characterized in that: the water glass adopting is a kind of inorganic bond, and main component is silicate of soda, and its caking property is strong, acidproof, heat-resisting, in order to reinforce soil.
3. grouting method as claimed in claim 1, is characterized in that: cement is the portland cement of label 32.5.
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| CN103321245B (en) * | 2013-06-18 | 2016-01-13 | 中铁十六局集团地铁工程有限公司 | The construction method of the protective device of underground utilities during a kind of shield driving |
| CN110734264A (en) * | 2019-10-10 | 2020-01-31 | 重庆市园林建筑工程（集团）股份有限公司 | Reinforcing material for historic building, preparation method and grouting reinforcement method |
| CN114647938B (en) * | 2021-12-10 | 2023-06-06 | 成都理工大学 | Cement paste construction real-time monitoring method and coagulation strength simulation measuring device 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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