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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- CN102518450B CN102518450B CN201110406488.4A CN201110406488A CN102518450B CN 102518450 B CN102518450 B CN 102518450B CN 201110406488 A CN201110406488 A CN 201110406488A CN 102518450 B CN102518450 B CN 102518450B
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- 239000004568 cement Substances 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000009412 basement excavation Methods 0.000 title claims abstract description 11
- 230000003014 reinforcing effect Effects 0.000 title description 11
- 239000007924 injection Substances 0.000 claims abstract description 38
- 238000002347 injection Methods 0.000 claims abstract description 38
- 239000002689 soil Substances 0.000 claims abstract description 33
- 230000002787 reinforcement Effects 0.000 claims abstract description 4
- 239000002002 slurry Substances 0.000 claims description 36
- 239000011398 Portland cement Substances 0.000 claims description 35
- 239000000463 material Substances 0.000 claims description 24
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- 239000003795 chemical substances by application Substances 0.000 claims description 18
- 235000019353 potassium silicate Nutrition 0.000 claims description 15
- 150000004645 aluminates Chemical class 0.000 claims description 14
- 229920003086 cellulose ether Polymers 0.000 claims description 14
- 238000009933 burial Methods 0.000 claims description 13
- 239000011440 grout Substances 0.000 claims description 7
- 239000004115 Sodium Silicate Substances 0.000 claims description 5
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 5
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 239000004567 concrete Substances 0.000 claims description 3
- 239000003513 alkali Substances 0.000 claims description 2
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 claims description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 2
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 2
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 2
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 2
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims description 2
- KVOIJEARBNBHHP-UHFFFAOYSA-N potassium;oxido(oxo)alumane Chemical compound [K+].[O-][Al]=O KVOIJEARBNBHHP-UHFFFAOYSA-N 0.000 claims description 2
- 229910001388 sodium aluminate Inorganic materials 0.000 claims description 2
- 239000002253 acid Substances 0.000 claims 1
- 239000000853 adhesive Substances 0.000 claims 1
- 230000001070 adhesive effect Effects 0.000 claims 1
- 239000012530 fluid Substances 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 4
- 239000004927 clay Substances 0.000 abstract description 4
- 238000007569 slipcasting Methods 0.000 description 19
- 238000007596 consolidation process Methods 0.000 description 15
- 239000011230 binding agent Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 10
- 230000008859 change Effects 0.000 description 7
- 238000010276 construction Methods 0.000 description 6
- 230000006872 improvement Effects 0.000 description 6
- 230000007480 spreading Effects 0.000 description 5
- 238000003892 spreading Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000000280 densification Methods 0.000 description 2
- 238000010790 dilution Methods 0.000 description 2
- 239000012895 dilution Substances 0.000 description 2
- 231100000252 nontoxic Toxicity 0.000 description 2
- 230000003000 nontoxic effect Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000012899 standard injection Substances 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical group [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Landscapes
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
在浅埋暗挖法地层加固时需要对地基进行注浆处理，第一次注浆采用普通水泥，而在第二次采用超细水泥进行补注。本发明所述的浅埋暗挖法地层加固普通水泥注浆取代超细水泥注浆方法，在第二次补注时，采用普通水泥代替超细水泥进行注浆以改良土壤，对开挖轮廓线外一定范围内淤泥质粘土进行针对性改良，保证了安全开挖。采用普通水泥注浆在强度上不仅与超细水泥注浆相当，而且节约了工程造价，具有良好的经济、社会效益。When the ground is reinforced by the shallow buried excavation method, the foundation needs to be grouted. The first grouting uses ordinary cement, and the second time uses ultra-fine cement for supplementary injection. In the shallow-buried underground excavation method of the present invention, ordinary cement grouting replaces superfine cement grouting method for ground reinforcement. During the second supplementary injection, ordinary cement is used instead of superfine cement for grouting to improve the soil, and the excavation profile is improved. The silty clay within a certain range outside the line was improved in a targeted manner to ensure safe excavation. The strength of ordinary cement grouting is not only equivalent to ultra-fine cement grouting, but also saves engineering cost and has good economic and social benefits.
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)
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| CN201110406488.4A CN102518450B (en) | 2011-12-09 | 2011-12-09 | Method for grouting ordinary cement rather than ultra-fine cement when reinforcing stratum by adopting shallow excavation method |
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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 |
| CN113901678B (en) * | 2021-12-10 | 2022-04-15 | 成都理工大学 | A device and method for evaluating the setting quality of cement slurry for engineering grouting |
| 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 |
| CN116606119A (en) * | 2023-05-30 | 2023-08-18 | 武汉科技大学 | Expansive slurry for rock mass grouting reinforcement and preparation method thereof |
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