CN103951320B - A kind of mixing proportion design method of sea-water mud of retaining wall stable performance - Google Patents
A kind of mixing proportion design method of sea-water mud of retaining wall stable performance Download PDFInfo
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Abstract
The invention provides a kind of mixing proportion design method of sea-water mud of retaining wall stable performance, comprise the following steps: one, select starting material; Two, Three factors five horizontal quadrature testing program is designed; Three, 25 groups of sea-water muds are prepared; Four, the test of proportion, viscosity, potential of hydrogen, percentage of water loss and mudcake thickness is all carried out to each group of sea-water mud; Five, test result is analyzed, determine that optimum level of factor combines, thus obtain the optimum mix of the sea-water mud of retaining wall stable performance.Compared with prior art, the present invention, by choosing and the design of proportioning raw-material, achieves the stability strengthening sea-water mud, the object especially stablizing the retaining wall performance of sea-water mud.In addition, the present invention is optimized by indexs such as the proportion to sea-water mud, viscosity, pH, fluid loss, mudcake thicknesses, effectively can prevent caving in and the infiltration of underground water of hole wall, make the retaining wall performance of sea-water mud have significant stability.
Description
Technical field
The invention belongs to Offshore Bridges pile foundation cast-in place pile Mud Technology field, be specifically related to a kind of mixing proportion design method of sea-water mud of retaining wall stable performance.
Background technology
The bridge spanning the sea that current China builds gets more and more, under ocean environment, Construction of Pile Bedding Boring needs to prepare a large amount of mud, premium mud is the key factor ensureing pile foundation quality, the limitation of fresh water configuration mud under ocean environment that current specifications requires: (1) fresh water is subject to the restriction in place and the restriction of transportcapacity in storage, transportation, affect construction speed, increase construction cost; (2) mud adopting fresh water to prepare still can be subject to the pollution of seawater, affects the performance of mud; (3) fresh water is prepared in sludge process needs to supply a large amount of fresh water, greatly will reduce operating efficiency thus, and increase construction cost.Therefore, gather materials on the spot for convenience, reduce construction cost, improve operating efficiency, adopt sea-water mud to be that under ocean environment, large bridge pile foundation construction needs one of gordian technique considered.
At present, traditional sea-water mud mix-design only considers in seawater exists a large amount of Ca
2+, Mg
2+, Na
+, Cl
-plasma, ignores the change of the ionic concn that seawater causes due to tidal phenomena, and when adopting the seawater of different steps to prepare mud, the performance index deformability of mud is very large.In addition, traditional sea-water mud mix-design reference water mud performance index are as checking index, to lack for pertinent ion change in concentration in seawater the impact analysis of mud off performance, lack a kind of ebb tide sea-water mud composition and division in a proportion method of design of retaining wall stable performance.Therefore, in sea-water mud mix-design process, the impact on sea-water mud retaining wall performance index and proportioning thereof of seawater intermediate ion concentration and Changing Pattern thereof must be considered.
In addition, when directly preparing mud with seawater, sodium bentonite and seawater mix and can condense and precipitate and separate, and seawater direct pulping colloidity is low, poor stability, retaining wall poor performance.Therefore prepare mud with seawater, suitable mud tackifier and dispersion agent must be selected, the stability of sea-water mud is met the demands, realize it and prevent caving in and the infiltration of underground water of hole wall, strengthen the retaining wall effect of mud.
On the whole, water mud mixing proportion design method is time-consuming, effort, investment are large, sea-water mud is gathered materials on the spot, and without the need to advantages such as special slurry producing facility, but needs to overcome the shortcomings such as the mud stability caused due to sea water ion change in concentration is poor, colloidity is low, retaining wall poor performance.Therefore, need badly and overcome above-mentioned mud property poor stability, the shortcoming that especially retaining wall performance is bad, a kind of ebb tide sea-water mud mixing proportion design method of retaining wall stable performance is provided.
Summary of the invention
Technical problem to be solved by this invention is for above-mentioned the deficiencies in the prior art, provides a kind of mixing proportion design method of sea-water mud of retaining wall stable performance.The method according in Practical Project to the requirement of mud off, and in conjunction with execution conditions and raw-material feature, by the ratio of orthogonal test determination ebb tide sea, clay for preparing mud, tackifier and dispersion agent, the sea-water mud that stability is strong, retaining wall performance is high is prepared in design, and improve the index controlling mud off performance, on the basis of guaranteeing engineering adaptability, there is significant economic benefit, social benefit, environmental benefit and technical benefits.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of mixing proportion design method of sea-water mud of retaining wall stable performance, and it is characterized in that, the method comprises the following steps:
Step one, selection starting material:
A. seawater: select ebb tide phase natural sea-water;
B. clay for preparing mud: select sodium bentonite to be clay for preparing mud;
C. tackifier: select polyacrylamide to be tackifier;
D. dispersion agent: select soda ash to be dispersion agent;
Step 2, orthogonal experimental design is carried out to the proportioning of sea-water mud:
Be 1000 at the mass ratio of seawater, clay for preparing mud, tackifier and dispersion agent: (110 ~ 190): (0.005 ~ 0.025): under the working condition of (2 ~ 4), clay for preparing mud, tackifier and dispersion agent is selected to be variable factor, each variable factor all chooses five number of levelss, designs Three factors five horizontal quadrature testing program thus;
Step 3, prepare 25 groups of sea-water muds according to the design requirements of Three factors described in step 2 five horizontal quadrature testing program, described in 25 groups, sea-water mud is all prepared by step 301 ~ 304:
Step 301, take seawater, clay for preparing mud, tackifier and dispersion agent respectively;
Step 302, by part heating of seawater to 65 DEG C ~ 80 DEG C, then the tackifier after taking in step 301 are dispersed in the part seawater after heating, obtain mixing solutions; The quality of described part seawater is 30% of the seawater total mass after taking in step 301;
Step 303, by the clay for preparing mud crushed after being dried after taking in step 301, then by the dispersion agent mix after taking in the clay for preparing mud after pulverizing and step 301 evenly, obtain native alkali mixture;
Step 304, alkali mixture native described in mixing solutions described in step 302, step 303 is mixed rear standing 24h ~ 30h with residual seawater, be then stir 40min under the condition of 30r/min ~ 40r/min in stir speed (S.S.), obtain sea-water mud;
Step 4, according to the requirement of highway bridge and culvert construction technique normalizing, the proportion of sea-water mud described in 25 groups, viscosity, potential of hydrogen, percentage of water loss and mudcake thickness all to be tested, to evaluate the retaining wall performance of each group of sea-water mud;
Step 5, the test result that step 4 obtains to be analyzed, obtain the impact for the retaining wall performance of sea-water mud of clay for preparing mud, tackifier and dispersion agent, finally determine that optimum level of factor combines, thus obtain the optimum mix of the sea-water mud of retaining wall stable performance.
The mixing proportion design method of the sea-water mud of above-mentioned a kind of retaining wall stable performance, it is characterized in that, the colloidity of sodium bentonite described in step one is not less than 95%, and sand factor is not more than 0.3%.
The mixing proportion design method of the sea-water mud of above-mentioned a kind of retaining wall stable performance, is characterized in that, temperature dry described in step 303 is 65 DEG C ~ 80 DEG C, and the time of described drying is 20min.
Principle of design of the present invention is: the composition of sea-water mud of the present invention comprises sodium bentonite, and the main component of sodium bentonite is montmorillonite.Montmorillonite is formed by Si-Al-Si three-decker overlap, its atypic plate-like surface very easily Liquidity limit.Sodium bentonite has thixotropic property, bulking performance and colloidal property.After sodium bentonite and sea water mixing, make liquid viscosity increase due to the expansion of sodium bentonite, under static condition, sodium bentonite Fibre Suspensions diminishes, but after stirring, can recover again original mobility (thixotropy).After sodium bentonite adds sea water mixing, seawater will soon enter between the lattice of montmorillonite, produces significant bulking.Bulking degree is different according to the different ions of montmorillonite surface adsorption.Na-bentonite soil particle after bulking, just becomes a kind of electronegative hydrophilic colloid in water, thus makes Na-bentonite soil particle keep the suspended state of dispersion, forms mud.
The present invention compared with prior art has the following advantages:
1, the present invention is by choosing ebb tide seawater as sea-water mud raw materials, make full use of ebb tide seawater compared with the metastable characteristic of the ionic concn of flood tide seawater, and seawater duration of fall is longer, more conveniently raw-materially to choose.In addition, density and the fresh water density of ebb tide seawater are comparatively close, the performance of sea-water mud more easy to control.
2, the present invention is by choosing sodium bentonite as ebb tide sea-water mud raw materials, and sodium bentonite is the main source of mud colloidal quality, and sodium bentonite mud skin is thin, good stability, mud yield are high.In order to increase the colloidity of mud, preferred colloidity is not less than 95%, and sand factor is not more than the sodium bentonite of 0.3%.
3, the present invention by adding polyacrylamide (PAM) in ebb tide sea-water mud, can change that original fluid loss is large, easily separated, poor reliability, retaining wall performance are bad, the shortcomings such as the mud skin formed is thicker, mud is made to have good thixotropy, water-retentivity, salt resistance and thinner mud skin, maintenance does not disperse, low-soild performance, improve proportion, viscosity, the pH value of mud, reduce the fluid loss of mud, the effect of the infiltration preventing borehole collapse and underground water can be played, strengthen the retaining wall effect of mud, overcome the impact of sea water ion concentration on mud property.
4, the present invention by adding soda ash (Na in ebb tide sea-water mud
2cO
3), sodium bentonite and the seawater phenomenon can condensed with precipitate and separate that mixes no longer is occurred, the particle of sodium bentonite can be disperseed, make seawater and sodium bentonite particle contacts more abundant, improve colloidity, pH value, the viscosity of mud, overcome the impact of sea water ion concentration on mud property, strengthen mud off, prevent the effect of collapse hole.In addition, Na is added
2cO
3na-bentonite soil particle can be disperseed, increase mud surface negative charge, with the drilling cuttings of adsorption zone positive charge, improve mud suspension drilling cuttings performance.
5, the present invention by adding PAM and Na in ebb tide sea-water mud
2cO
3, this mud can be made to have following features: (1) viscosity is high.This mud viscosity is very high, and therefore corresponding colloidity is large.Like this, mud colloid forms one deck chemical films in Extra-fine sand, the coarse sand gravel soil body, closes hole wall, keeps hole wall to stablize.(2) fluid loss is little.Generally speaking, mudcake thickness is directly proportional to filtering slurry percentage of water loss, and the low percentage of water loss of this mud makes it have the thin feature of mud skin.(3) after pore-forming, mud skin is thin.This is an important feature of this mud.After adopting this mud, mud cake on the wall of borehole thickness is less than 1mm, and this is that water mud is difficult to accomplish.(4) do not disperse.This performance makes mud generation throwing out after boring, thus makes the fine particle drilling cuttings in mud become larger particles sediment further, and then is easily removed by mechanical desanding device.The specific function that the clay for preparing mud of this reservation high-quality of this mud, flocculation remove drilling cuttings inferior is extremely conducive to mud circulation, purification.
6, in order to reach the object of the retaining wall performance strengthening mud, present invention optimizes a series of sea-water mud index, its index comprises: proportion, viscosity, pH, fluid loss, mud skin depth.Sea-water mud proportion increases the wall pressure that can increase hole wall, and hole wall also tends towards stability, but sea-water mud proportion is excessive, and fluid loss can be caused to increase, and mud skin depth also can increase, and increases the difficulty of clear hole and grouting; The reduction of sea-water mud proportion can reduce hole wall wall pressure, causes the phenomenon of hole wall collapse.The increase of sea-water mud viscosity can cause mudcake thickness to increase, favourable to prevention groundwater seepage, but sea-water mud is crossed conference and caused " stick with paste bore ", affect drill speed, increases the difficulty that sea-water mud purifies; The too small meeting of sea-water mud viscosity causes mudcake thickness excessively thin, unfavorable to prevention groundwater seepage.The pH value of sea-water mud is relevant to the salinity in stake Zhou Haishui and earth, and pH rising can make hole wall surface soften, and causes hole wall collapse.Sea-water mud fluid loss increases can increase mudcake thickness, favourable to prevention groundwater seepage, but the hole wall sea-water mud skin of the excessive formation of sea-water mud fluid loss is blocked up, easily causes collapse hole; Otherwise sea-water mud fluid loss reduces then.Sea-water mud mudcake thickness increases and easily forms shrinkage cavity and collapse hole phenomenon; Sea-water mud mud skin is excessively thin, then can not play the effect of retaining wall.
7, the present invention is in sea-water mud mix-design process, by selecting ebb tide seawater as the starting material of slurrying, and adds tackifier PAM and dispersion agent Na wherein
2cO
3, achieve the stability strengthening mud, improve the object of the retaining wall performance of mud.In addition, the present invention considers emphatically the retaining wall performance of ebb tide sea-water mud, optimize the proportion of ebb tide sea-water mud, viscosity, pH, fluid loss, mud skin depth index, effectively prevent caving in and the infiltration of underground water of hole wall, strengthen the retaining wall effect of mud, and suspension boring mud and the ability of carrying boring mud can be ensured, reduce ocean boring construction cost, reduce ocean drilling construction to interrupt, reduce ocean boring accident rate.There is feature that is easy to operate, that ensure construction quality, shorten the construction period, on the basis of guaranteeing engineering adaptability, there is significant economic benefit, social benefit, environmental benefit and technical benefits.
Below in conjunction with drawings and Examples, the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is the design process of mixing ratio figure of the sea-water mud of retaining wall stable performance of the present invention.
Fig. 2 is preparation technology's schema of sea-water mud of the present invention.
Fig. 3 is sodium bentonite of the present invention content-sea-water mud specific gravity curve.
Fig. 4 is sodium bentonite of the present invention content-sea-water mud viscograph.
Fig. 5 is sodium bentonite of the present invention content-sea-water mud fluid loss curve.
Fig. 6 is sodium bentonite of the present invention content-sea-water mud mudcake thickness curve.
Fig. 7 is sodium bentonite of the present invention content-sea-water mud pH value curve.
Fig. 8 is sodium bentonite of the present invention content-sea-water mud colloidity curve.
Fig. 9 is sodium bentonite of the present invention content-sea-water mud sand factor curve.
Figure 10 is PAM of the present invention content-sea-water mud viscograph.
Figure 11 is PAM of the present invention content-sea-water mud fluid loss curve.
Figure 12 is PAM of the present invention content-sea-water mud mudcake thickness curve.
Figure 13 is PAM of the present invention content-sea-water mud pH value curve.
Figure 14 is PAM of the present invention content-sea-water mud colloidity curve.
Figure 15 is soda content of the present invention-sea-water mud viscograph.
Figure 16 is soda content of the present invention-sea-water mud fluid loss curve.
Figure 17 is soda content of the present invention-sea-water mud mud skin depth curve.
Figure 18 is soda content of the present invention-sea-water mud pH value curve.
Figure 19 is soda content of the present invention-sea-water mud colloidity curve.
Embodiment
Applicant carries out in the process of ultra-long pile basis drilling construction at Fujian Province Lang Qi Min River Bridge bridge site place, and propose a kind of mixing proportion design method of sea-water mud being applicable to thinkling sound's qi Min River Bridge operating mode, retaining wall stable performance, its design cycle as shown in Figure 1.Detailed process is as follows:
The starting material of step one, selection sea-water mud
A. the selection of seawater: utilize the natural sea-water at thinkling sound's qi Min River Bridge bridge site place to test, gets flood tide phase natural sea-water and ebb tide phase natural sea-water is used for preparing sea-water mud.The physical and chemical index of the natural sea-water at thinkling sound's qi Min River Bridge bridge site place is in table 1.
The natural sea-water physical and chemical index at table 1 thinkling sound qi Min River Bridge bridge site place
B. the selection of clay for preparing mud: field test research is selected with the high Shandong sodium bentonite of smectite content; Its colloidity is not less than 95%, and sand factor is not more than 0.3%.
C. the selection of tackifier: field test research selects polyacrylamide (PAM) as tackifier.
D. the selection of dispersion agent: field test research selects soda ash (Na
2cO
3) as dispersion agent.
Step 2, orthogonal experimental design is carried out to the proportioning of sea-water mud
At seawater, sodium bentonite, PAM and Na
2cO
3mass ratio be 1000: (110 ~ 190): (0.005 ~ 0.025): under the working condition of (2 ~ 4), setting operating mode 1 be: flood tide seawater+sodium bentonite+PAM+Na
2cO
3; Limiting operating mode 2 is: ebb tide seawater+sodium bentonite+PAM+Na
2cO
3.Wherein, test seawater consumption all calculates by 1000g, and the density of ebb tide seawater is by 1.000
g/ cm
3calculate.
Choose sodium bentonite, PAM and Na
2cO
3as variable factor, 110g, 130g, 150g, 170g and 190g five number of levelss chosen by sodium bentonite, and PAM chooses 0.005g, 0.01g, 0.015g, 0.02g and 0.025g five number of levelss, Na
2cO
3choose 2g, 2.5g, 3g, 3.5g and 4g five number of levelss, design Three factors five level and L
25(5
3) orthogonal test scheme, research is launched to the engineering adaptability of sea-water mud.Orthogonal test level of factor under two kinds of working conditions is in table 2.The Three factors five horizontal quadrature testing program of flood tide sea-water mud and test-results are in table 3.The Three factors five horizontal quadrature testing program of ebb tide sea-water mud and test-results are in table 4.
Table 2 orthogonal test level of factor table
The Three factors five horizontal quadrature testing program of table 3 flood tide sea-water mud and test-results
The Three factors five horizontal quadrature testing program of table 4 flood tide sea-water mud and test-results
Step 3, prepare 25 groups of sea-water muds, its preparation technology's schema as shown in Figure 2.
Described in 25 groups, sea-water mud is all prepared by step 301 ~ 304:
Step 301, take seawater, clay for preparing mud, tackifier and dispersion agent respectively;
Step 302, by part heating of seawater to 65 DEG C ~ 80 DEG C, then the tackifier after taking in step 301 are dispersed in the part seawater after heating, obtain mixing solutions; The quality of described part seawater is 30% of the seawater total mass after taking in step 301;
Step 303, by the clay for preparing mud crushed after being dried after taking in step 301, then by the dispersion agent mix after taking in the clay for preparing mud after pulverizing and step 301 evenly, obtain native alkali mixture; The temperature of described drying is 65 DEG C ~ 80 DEG C, and the time of described drying is 20min;
Step 304, alkali mixture native described in mixing solutions described in step 302, step 303 and residual seawater (i.e. seawater total mass 70%) are mixed rear standing 24h ~ 30h, then be stir 40min under the condition of 30r/min ~ 40r/min in stir speed (S.S.), obtain sea-water mud.
The properties of step 4, test sea-water mud
According to " highway bridge and culvert construction technique normalizing " (JTGTF50-2011) and engineering practice of construction situation, the leading indicator of setting sea-water mud is: sea-water mud proportion is 1.06 ~ 1.10, sea-water mud viscosity is 18 ~ 28s, sea-water mud gel strength is 1 ~ 2.5Pa, sea-water mud sand factor≤4%, sea-water mud potential of hydrogen (pH) is 8 ~ 10, sea-water mud colloidity >=95%, sea-water mud percentage of water loss≤20ml/30min, sea-water mud mudcake thickness≤3mm.Wherein, sea-water mud retaining wall performance by: proportion, viscosity, potential of hydrogen, percentage of water loss and mudcake thickness five indices are evaluated.
According to the requirement of highway bridge and culvert construction technique normalizing, the test of proportion, viscosity, potential of hydrogen, percentage of water loss and mudcake thickness is all carried out, to evaluate the retaining wall performance of each group of sea-water mud to 25 groups of sea-water muds.
Step 5, the test-results of sea-water mud to be analyzed
According to the testing data of sea-water mud and then draw out Fig. 3 to 19, wherein Fig. 3 is sodium bentonite content-sea-water mud specific gravity curve; Fig. 4 is sodium bentonite content-sea-water mud viscograph; Fig. 5 is sodium bentonite content-sea-water mud fluid loss curve; Fig. 6 is sodium bentonite content-sea-water mud mudcake thickness curve; Fig. 7 is sodium bentonite content-sea-water mud pH value curve; Fig. 8 is sodium bentonite content-sea-water mud colloidity curve; Fig. 9 is sodium bentonite content-sea-water mud sand factor curve; Figure 10 is PAM content-sea-water mud viscograph; Figure 11 is PAM content-sea-water mud fluid loss curve; Figure 12 is PAM content-sea-water mud mudcake thickness curve; Figure 13 is PAM content-sea-water mud pH value curve; Figure 14 is PAM content-sea-water mud colloidity curve; Figure 15 is soda content-sea-water mud viscograph; Figure 16 is soda content-sea-water mud fluid loss curve; Figure 17 is soda content-sea-water mud mud skin depth curve; Figure 18 is soda content-sea-water mud pH value curve; Figure 19 is soda content-sea-water mud colloidity curve.Can analyze from Fig. 3 to 19 and draw:
1) sodium bentonite content is on the impact of mud index
1. along with the increase of sodium bentonite content, mudcake thickness, colloidity, proportion, sand factor and viscosity all significantly increase, and the fluid loss of mud reduces to some extent, and pH change is not obvious.
2. when ebb tide sea-water mud is identical with flood tide sea-water mud proportioning, ebb tide sea-water mud is compared with flood tide sea-water mud, and its proportion is little, viscosity is large, mudcake thickness is large, colloidity is large, sand factor is high.
2) impact of tackifier levels change on mud index
1. along with the increase of PAM content, the viscosity of mud, colloidity, mudcake thickness significantly increase, and pH value remains unchanged substantially, and fluid loss reduces rapidly.PAM content on the proportion, sand factor, gel strength etc. of mud substantially without impact.
2. when simulated mud is identical, the colloidity of ebb tide sea-water mud is far above the colloidity of flood tide sea-water mud, this is because the susceptibility of mud to salt is higher, and in flood tide seawater inorganic salt content much larger than ebb tide seawater, the Na-bentonite soil particle that affects by seawater salinity occurs coalescent and sink, and causes the colloidity of flood tide sea-water mud to decline.
3) impact of soda content change on mud index
Along with the increase of soda content, the colloidity of flood tide sea-water mud increases, and the change of the colloidity of ebb tide sea-water mud is little, shows that the colloidity impact of the content of soda ash on ebb tide sea-water mud is little, and larger on the colloidity impact of flood tide sea-water mud.Soda content increases, and pH value, the viscosity of flood tide sea-water mud and ebb tide sea-water mud increase all to some extent, and fluid loss reduces to some extent, and mudcake thickness is without considerable change.
Step 6, determine the optimum mix of sea-water mud
By analyzing the Changing Pattern of each raw material usage, determine that the retaining wall performance of ebb tide sea-water mud is generally better than the retaining wall performance of flood tide sea-water mud.Therefore, the application's final choice ebb tide seawater prepares the sea-water mud of retaining wall stable performance, and its optimum mix is in table 5.
The optimum mix of the sea-water mud of table 5 retaining wall stable performance
According to above-mentioned ebb tide sea-water mud for step, adopt the optimum mix in test, the property indices of ebb tide sea-water mud is in table 6, various performance requriementss to mud when can meet boring, thus effectively can prevent caving in and the infiltration of underground water of hole wall, suspension boring mud also carries boring mud ability and also can be guaranteed.Therefore, Construction of Bored Piles over Sea adopts ebb tide sea-water mud, greatly can reduce construction cost, can not affect because of weather, sea situation, ship machine etc. the interruption causing drilling construction when drilling construction, decrease accident rate in drilling construction mesopore, quality is guaranteed, and construction link is few, illustrates that ebb tide sea-water mud has good engineering adaptability thus.
The properties of table 6 sea-water mud under optimum mix condition
The prime cost of water mud is the expense of seawater during the transport charge of fresh water hole with displacement, and through trial section project accounting, a pile drilling process on average needs 350m
3fresh water, fresh water is by 25 yuan/m
3meter, displacement seawater expense through adjust be about 0.875 ten thousand yuan, other materials as sodium bentonite and soda ash about 0.12 ten thousand yuan, the slurried material cost of a pile about 0.995 ten thousand yuan.Adopt seawater configuration mud, prime cost is that tackifier PAM, PAM are by 20,000 yuan/ton.Every pile needs PAM to be about 6kg, and its Master Cost is 0.012 ten thousand yuan, other materials as sodium bentonite and soda ash about 0.14 ten thousand yuan, the material cost of a pile about 0.152 ten thousand yuan.Therefore, if a pile uses ebb tide sea-water mud can save about 0.843 ten thousand yuan.As can be seen here, adopt maritime mud-making to be not only conducive to gathering materials on the spot, also greatly reduce the cost of engineering, achievement in research has significant economic benefit.
In sum, the present invention effectively overcome water mud mixing proportion design method time-consuming, require great effort, invest that the mud stability that the shortcoming such as large and original sea-water mud mixing proportion design method sea water ion change in concentration cause is poor, the shortcoming such as colloidity is low, retaining wall poor performance and there is significant economic benefit, social benefit, environmental benefit and technical benefits, and there is high industrial utilization.
The above is only preferred embodiment of the present invention, not imposes any restrictions the present invention.Every above embodiment is done according to invention technical spirit any simple modification, change and equivalence change, all still belong in the protection domain of technical solution of the present invention.
Claims (3)
1. a mixing proportion design method for the sea-water mud of retaining wall stable performance, is characterized in that, the method comprises the following steps:
Step one, selection starting material:
A. seawater: select ebb tide phase natural sea-water;
B. clay for preparing mud: select sodium bentonite to be clay for preparing mud;
C. tackifier: select polyacrylamide to be tackifier;
D. dispersion agent: select soda ash to be dispersion agent;
Step 2, orthogonal experimental design is carried out to the proportioning of sea-water mud:
Be 1000 at the mass ratio of seawater, clay for preparing mud, tackifier and dispersion agent: (110 ~ 190): (0.005 ~ 0.025): under the working condition of (2 ~ 4), clay for preparing mud, tackifier and dispersion agent is selected to be variable factor, each variable factor all chooses five number of levelss, designs Three factors five horizontal quadrature testing program thus;
Step 3, prepare 25 groups of sea-water muds according to the design requirements of Three factors described in step 2 five horizontal quadrature testing program, described in 25 groups, sea-water mud is all prepared by step 301 ~ 304:
Step 301, take seawater, clay for preparing mud, tackifier and dispersion agent respectively;
Step 302, by part heating of seawater to 65 DEG C ~ 80 DEG C, then the tackifier after taking in step 301 are dispersed in the part seawater after heating, obtain mixing solutions; The quality of described part seawater is 30% of the seawater total mass after taking in step 301;
Step 303, by the clay for preparing mud crushed after being dried after taking in step 301, then by the dispersion agent mix after taking in the clay for preparing mud after pulverizing and step 301 evenly, obtain native alkali mixture;
Step 304, alkali mixture native described in mixing solutions described in step 302, step 303 is mixed rear standing 24h ~ 30h with residual seawater, be then stir 40min under the condition of 30r/min ~ 40r/min in stir speed (S.S.), obtain sea-water mud;
Step 4, according to the requirement of highway bridge and culvert construction technique normalizing, the proportion of sea-water mud described in 25 groups, viscosity, potential of hydrogen, percentage of water loss and mudcake thickness all to be tested, to evaluate the retaining wall performance of each group of sea-water mud;
Step 5, the test result that step 4 obtains to be analyzed, obtain the impact for the retaining wall performance of sea-water mud of clay for preparing mud, tackifier and dispersion agent, determine that optimum level of factor combines, thus obtain the optimum mix of the sea-water mud of retaining wall stable performance.
2. the mixing proportion design method of the sea-water mud of a kind of retaining wall stable performance according to claim 1, it is characterized in that, the colloidity of sodium bentonite described in step one is not less than 95%, and sand factor is not more than 0.3%.
3. the mixing proportion design method of the sea-water mud of a kind of retaining wall stable performance according to claim 1, is characterized in that, temperature dry described in step 303 is 65 DEG C ~ 80 DEG C, and the time of described drying is 20min.
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| CN104480927A (en) * | 2014-10-29 | 2015-04-01 | 上海市政建设有限公司 | Construction method of soil improvement |
| CN104404850A (en) * | 2014-11-18 | 2015-03-11 | 滁州市公路管理局 | Method for improving bending tensile strength and durability of cement concrete for road |
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| CN105714768A (en) * | 2016-03-09 | 2016-06-29 | 中国水利水电第十一工程局有限公司 | Application method of wall protecting fluid to pile foundation construction |
| CN106367045A (en) * | 2016-08-23 | 2017-02-01 | 北京市勘察设计研究院有限公司 | Anti-collapse and drag-reducing polymer drilling fluid and application thereof |
| CN109867494B (en) * | 2019-04-19 | 2021-03-05 | 重庆建工第二建设有限公司 | Preparation method of wall protection slurry for mechanical rotary digging pile |
| CN110922949B (en) * | 2019-10-28 | 2022-04-05 | 北京中煤矿山工程有限公司 | Low specific gravity and high performance retaining wall slurry material for long horizontal freezing drilling in muddy clay and preparation method thereof |
| CN112250388A (en) * | 2020-10-28 | 2021-01-22 | 中国水电基础局有限公司 | High-halogen seawater wall-protecting slurry for impervious wall and preparation method thereof |
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| CN103539389A (en) * | 2012-07-16 | 2014-01-29 | 浙江海洋学院 | Preparation method of seawater mixing cemented soil |
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| CN101318799A (en) * | 2008-07-01 | 2008-12-10 | 中国海洋石油总公司 | High-strength low-freedom water low-density oil well cement paste |
| CN101486549A (en) * | 2009-02-18 | 2009-07-22 | 路桥集团国际建设股份有限公司 | Slurry for cross-sea bridge drilling pile drill construction and pulp making method |
| CN103539389A (en) * | 2012-07-16 | 2014-01-29 | 浙江海洋学院 | Preparation method of seawater mixing cemented soil |
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