CN1994953A - Super big diameter mud water balance simultaneous grouting slurry for tunnel shield construction - Google Patents

Abstract

The invention discloses synchronous slip casting slurry of hyper-big diameter mud balanced shield construction in the architectural tunnel engineering domain, which comprises the following steps: 3-10% lime hydrate, 10-42% coal ash, 1. 4-3. 6% alta-mud, 24-65% sand, 0.1-0.3% polyacrylic sulphonate and polysorbitol synthesis and water.

Description

The super big diameter mud water balance simultaneous grouting slurry for tunnel shield construction

Technical field

The present invention is a kind of simultaneous grouting slurry that relates to building Tunnel Engineering field, particularly a kind of super big diameter mud water balance simultaneous grouting slurry for tunnel shield construction.

Background technology

The present slurry balance shield of super-large diameter in the world, diameter is: 15.43m.The maximum diameter shield engine of the inside and outside under construction of host country at present is all less than diameter 15.43m, as: the slurry balance shield of road cross-river tunnel diameter 14.87m in the earth pressure balanced shield, EPBS of the German extra large Rake diameter 15.2m of company that the Madrid, ESP vcehicular tunnel uses and the last sea, the head size is all less than maximum diameter.

The slurry balance shield construction technology is adopted in cross-river tunnel construction both at home and abroad in the past usually, and synchronous grouting system is biliquid rapid hardening slurry system.This slurries are the A liquid by two-pack: cement, wilkinite (auxiliary agent), stable liquid, water, B liquid: water glass is formed, the AB material mixes at mixing tank before injecting the space, section of jurisdiction, produces when mixed slurries enter the wall post gap and condenses, and have certain compression strength.This slurries exist: (1) two-pack slurries must keep certain fluidity after mixing, after putting in place, the slurries filling can produce intensity, but this control difficulty is bigger, and often the too early fixed post slip-casting liquid that causes of mixed serum can not put in place, produces the phenomenon of grouting filling inequality; (2) mixed slurries are subject to the dilution and the infiltration influence of underground water and the positive supporting muddy water of shield structure, and the time of coagulation of slurries and intensity are difficult to control; (3) soil layer is easily produced splitting, cause grouting amount undesirable considerably beyond theoretical value (about about 180～250%), slip casting effect, (4) the solid body intensity of slurries inequality, construction period section of jurisdiction interannular faulting of slab ends (marking time)＞1cm, and not strong to the auxiliary anti-leakage effect of section of jurisdiction; (5) mix complexity of slurry, grouting equipment, pipeline cleaning quality and frequency requirement height, otherwise easily plugging.In this case, adopt the method for secondary remedial cementing slurry usually, make grout and the original slurry consolidation of injecting, can control ground settlement preferably.

Through the prior art and the Searches of Patent Literature are found, the slurry shield simultaneous grouting slurry all adopts the biliquid slurry both at home and abroad, mention in " the adopting slurry shield driving peat bed below---work area, rapid transit railway Line 1 Hu mound western entrance, Yokohama city " of publishing as Japan's " subterranean tunnel " magazine, the back injecting paste material is formed mainly following (table-1):

Table-1

Material	A				B
						The plasticity-based material	Cement	Wilkinite	Stability material	Water	Water glass
The percentage volume	21.23	2.5	0.34	67.73	8.2

As seen from the above table, slurries structure formation is the two-pack form, and all there is above-mentioned drawback in the slurries of this form, and promptly (1) control difficulty is bigger, the grouting filling inequality; (2) time of coagulation of slurries and intensity are difficult to control; (3) soil layer is easily produced splitting, slip casting rate height; (4) the solid body intensity of slurries inequality, construction period tunnel duct piece interannular faulting of slab ends (marking time) all＞1cm, the early stage stabilising effect in control tunnel is undesirable, auxiliary anti-leakage effect is not strong; (5) to pipeline cleaning quality and frequency requirement height

Summary of the invention

The objective of the invention is to overcome deficiency of the prior art, a kind of maximum diameter mud water balance simultaneous grouting slurry for tunnel shield construction is provided.Make slurries have high specific gravity, high-moisture-retention, high workability, good filling and yield value, can effectively in time control section of jurisdiction interannular faulting of slab ends (marking time) and sink-float in the constructing tunnel, slurries unit price and grouting amount are economical than the biliquid slurry.

The present invention is achieved by the following technical solutions, weight percent of the present invention is specially: slaked lime 3～10%, flyash 10～42%, wilkinite 1.4～3.6%, sand 24～65%, polypropylene sulfonate and polysorbate form synthetics 0.1～0.3%, surplus is: water.

Preferable range of the present invention: slaked lime 3～7%, flyash 15～42%, wilkinite 1.4～3.6%, sand 24～65%, polypropylene sulfonate and polysorbate form synthetics 0.1～0.3%, surplus is: water.

Described polypropylene sulfonate and polysorbate form synthetics, as additive, and its proportion 1.06 ± 0.01, water-reducing rate 20～30%, aquation controllability＞20H, degree of hydrolysis＜30%.

Described polypropylene sulfonate and polysorbate form synthetics, for: α-sulfonic acid vinylformic acid polysorbate, α-sulfonic acid vinylformic acid polysorbate obviously can increase slurries toughness, yield strength, the anti-segregation of raising, oilness.

According to above material mixture ratio, the performance index that slurries reached are (table-2):

Table-2

Project

Standard

Perviousness	5×10 -5cm/s
		Density	＞1.80g/cm 3
The slump (newly mixing)	12～18cm
		The slump (10～30H)	≥5cm
Yield strength (10～30H)	800kPa
		The pressure dehydration (7 ' 30 ", 1bar)	＜15ml
Bleeding	＜5ml
		Serviceable time	10～30H
Ultimate compression strength	90d，＞1.0MPa
		The slip casting rate	100～120％

After the slip casting of the present invention, the tunnel duct piece surface drying does not have percolating water phenomenon; Slurries high specific gravity, high slumpability, good yield strength help to control the attitude of constructing tunnel shield engine simultaneously, and construction period tunnel duct piece interannular faulting of slab ends (marking time) helps to control ground settlement in 6～8mm scope; Slurries have higher water conservation lubricity, can reduce the plugging phenomenon in the slip casting process; It is more convenient to construct, and slurries are easy to control the quality, need not duty and washes pipeline; The slurries unit price is lower than biliquid slurry, grouting amount be controlled at theoretical value 120% in, have cost performance preferably.

The present invention compared with prior art has higher thickness feature, has effective water conservation oilness simultaneously, and the effect of high pump-conveying property, low slip casting rate make the high specific gravity slurries can satisfy the requirement of grouting equipment better.Overcome the biliquid slurry and can not satisfy purpose maximum diameter 15.43m muddy water air pressure balance shielded construction in the world.

Embodiment

Below embodiments of the invention are elaborated: present embodiment is being under the prerequisite with the technical solution of the present invention; to at present in the world maximum diameter 15.43m slurry balance shield Yangtze River Tunnel super big diameter mud water shield structure implement; provided detailed embodiment and process, but protection scope of the present invention is not limited to following embodiment.

Embodiment slurries production method: slurries are made to adopt and are mixed the slurry system operation automatically, realize all Additive self-feedings, mix slurry, guarantee the slurries uniform quality.Mix the slurry process: all siccatives add in the slurry mixing tank, add entry and additive after the dry mixing, and stirring must not be less than 1min, detect and send into slurry storage tank after the slurries quality reaches the slurries index.Use the implementation step of slurries: certain cross-river tunnel construction, this threaded list road, east, tunnel length is 7471.65m, and segment length is 6872.37m in the river, and western threaded list road length is 7469.36m, and wherein segment length is 854.91m in the river, the most shallow earthing 9.0m is less than shield structure diameter.Be in grey silt clay～fine sand layer, the upper strata is highly sensitive, is subjected to free settling after the disturbance.This tunnel adopts the ultra-large type slurry balance shield development machine construction of the German extra large Rake diameter 15.43m of company.The tunnel in the turnover hole, pass through the Changjiang river flood-control wall and require different to the proportioning of slurries with technical parameter with shallow earthing, stage casing, river.Use the processing requirement (table-3) of slurries:

Table-3

Title material	Requirement
		Slaked lime	Calcium hydroxide content 〉=95%, 320 screen residue≤0.5%
Flyash	The II level, (the 0.045mm square hole sieve tails over fineness, and per-cent is less than 20 ~ 45
		Fine sand	With 100% by No. 8 sieve apertures, 50pm particulate composition≤20% is advisable
Wilkinite	95% by 200 mesh sieves, rate of expansion 18 ~ 20ml/g
		Water	Domestic water
Polypropylene sulfonate and polysorbate form synthetics	Proportion 1.06 ± 0.01 (20 ℃), water-reducing rate 20～30%, aquation controllability＞20H, degree of hydrolysis＜30%

Embodiment one:

Shield engine turnover hole section, the tunnel is in stabilization zone, and the present embodiment weight percent is specially: slaked lime 3%, flyash 42%, sand 24%, wilkinite 2.4%, α-sulfonic acid vinylformic acid polysorbate 0.1%, surplus are: water.

Slurries index (table-4):

Table-4

Project	Standard
		The slump (20～30H)	≥5cm
Yield strength (20～30H)	800kPa
		Serviceable time	20～30H
Other indexs are with table-2

Embodiment two:

Shield engine advances shallow earthing and crosses flood-control wall, and the present embodiment weight percent is specially: slaked lime 7%, flyash 15%, sand 65%, wilkinite 3.6%, α-sulfonic acid vinylformic acid polysorbate 0.3%, surplus are: water.

Slurries index (table-5):

Table-5

Project	Standard
		The slump (15H)	≥5cm
Yield strength (15H)	800kPa
		Serviceable time	10～15H
Other indexs are with table-2

Embodiment three:

Shield engine advances Jiang Zhongduanqu, and the present embodiment weight percent is specially: slaked lime 5%, flyash 30%, sand 45.4%, wilkinite 1.4%, α-sulfonic acid vinylformic acid polysorbate 0.2%, surplus are: water.

Slurries index (table-6):

Table-6

Project	Standard
		The slump (20H)	≥5cm
Yield strength (20H)	800kPa
		Serviceable time	15～20H
Other indexs are with table-2

Embodiment four

Shield engine enters mud matter soft clay stratum district in the river, soil body liquid limit index height, the present embodiment weight percent is specially: slaked lime 10%, flyash 10%, sand 45.4%, wilkinite 1.4%, α-sulfonic acid vinylformic acid polysorbate 0.2%, surplus are: water.

Slurries index (table-7):

Table-7

Project

Standard

The slump (10H)	≥5cm
		Yield strength (10H)	800kPa
Serviceable time	15～20H
		Other indexs are with table-2

More than four routine implementation results be: grouting amount is controlled in the theoretical value 120%, section of jurisdiction interannular faulting of slab ends (marking time) in 6～8mm, the section of jurisdiction surface drying, tunnel sink-float is controlled.

Actual effect compares:

Use present embodiment, compare with using dual-fluid synchronous slip casting slurries construction embodiment:

(1) tunnel duct piece surface drying does not have tangible percolating water phenomenon;

(2) help to control the come-up in tunnel, construction period the tunnel do not have serious rising phenomenon to produce;

(3) help to control the tunnel sink-float, section of jurisdiction interannular faulting of slab ends (marking time) is in 6～8mm;

(4) slurries have higher water conservation lubricity, can reduce the plugging phenomenon in the slip casting process;

(5) high specific gravity of slurries, high slumpability and good yield strength can help the control of tunnel quality;

(6) construction is more convenient, and slurries are easy to control the quality, need not duty and wash pipeline;

(7) grouting amount has cost performance preferably less than 120%.

Claims (4)

1, a kind of present world diameter maximum diameter mud water balance simultaneous grouting slurry for tunnel shield construction, it is characterized in that, its weight percent is specially: slaked lime 3～10%, flyash 10～42%, wilkinite 1.4～3.6%, sand 24～65%, polypropylene sulfonate and polysorbate form synthetics 0.1～0.3%, surplus is: water.

2, diameter 15.43m mud water balance simultaneous grouting slurry for tunnel shield construction according to claim 1, it is characterized in that, its weight percent is specially: slaked lime 3～7%, flyash 15～42%, wilkinite 1.4～3.6%, sand 24～65%, polypropylene sulfonate and polysorbate form synthetics 0.1～0.3%, surplus is: water.

According to claim 1 or 2 described diameter 15.43m mud water balance simultaneous grouting slurry for tunnel shield construction, it is characterized in that 3, described polypropylene sulfonate and polysorbate form synthetics, its proportion 1.06 ± 0.01, water-reducing rate 20～30%, aquation controllability＞20H, degree of hydrolysis＜30%.

According to claim 1 or 2 described diameter 15.43m mud water balance simultaneous grouting slurry for tunnel shield construction, it is characterized in that 4, described polypropylene sulfonate and polysorbate form synthetics, for: α-sulfonic acid vinylformic acid polysorbate.