CN108150179B - High osmosis bad ground shield pressure chamber sediment improvement method - Google Patents
High osmosis bad ground shield pressure chamber sediment improvement method Download PDFInfo
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- CN108150179B CN108150179B CN201810027837.3A CN201810027837A CN108150179B CN 108150179 B CN108150179 B CN 108150179B CN 201810027837 A CN201810027837 A CN 201810027837A CN 108150179 B CN108150179 B CN 108150179B
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- stratum
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- grain group
- bad ground
- sediment improvement
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The present invention is a kind of high osmosis bad ground shield pressure chamber sediment improvement method, includes the following steps: that the geological conditions on shield crossing stratum is investigated thoroughly and collected in (1)；(2) several representative bad ground operating conditions are selected, according to stratum ratio shared by shield crossing section each under every kind of operating condition；(3) grading curve of obtained mixed particle size distribution curve and existing earth pressure balanced shield and ground adaptability is compared, preresearch estimates goes out in high osmosis bad ground improved, process the fine grained partial size and incorporation for needing to mix；(4) stratum of shield crossing is sampled at the scene, determines sediment improvement outer-penetrating agent type and incorporation.Advantage: due to considering coarse granule stratum and fine grained stratum melange effect in bad ground, compared to only considering that coarse granule stratum sediment improvement more tallies with the actual situation, to advantageously reduce the cost of the universal sediment improvement for only considering least favorable coarse grain stratum at present.
Description
Technical field
The present invention relates to a kind of high osmosis bad ground shield pressure chamber sediment improvement methods, belong to underground engineering construction
Technical field.
Background technique
Earth pressure balanced shield encounters high permeability formation when tunneling and tends to occur gushing for spiral dumper soil-discharging port, i.e.,
Tu Shui occurs and separates a large amount of underground water by pressure chamber and the discharge of spiral dumper, causes the pressure of pressure chamber to drop suddenly, excavation face
The safety accidents such as collapsing, surface subsidence take place frequently.Therefore, shield crossing high permeability formation causes shield engineering circles and academia
Great attention.When shield driving, the opportunity for encountering single high osmosis coarse grain stratum is to be much smaller than to encounter Thief zone in fact
The bad ground of property coarse grain stratum refinement grain soil layer.Under normal conditions, in order to ensure the safety of shield driving, from worst
Angle, which is set out, to be generally selected the coarse grain stratum of high osmosis and is studied, and is carried out sediment improvement test, is routinely incorporated into a certain amount of
Outer-penetrating agent, such as bubble, bentonite slurry or calcareous bentonite slurry (containing a certain amount of fine grained soil), make up to
Plastic Flow state meets the requirement of shield-tunneling construction, prevents the accident of gushing.Due to from worst operating condition, often
Ignore true situation be shield digging get off be particulate soil layer and high osmosis coarse grain soil layer mixing slag soil, compared to
Coarse-grained soil will have more fine graineds, there is better gradation.This is beneficial to make full use of fine grained in this bad ground
The hole that coarse granule is formed is filled, the permeability of dregs after mixing is advantageously reduced, to effectively reduce the improvement of coarse-grained soil
Difficulty.
Summary of the invention
The present invention provides a kind of high osmosis bad ground shield pressure chamber sediment improvement method, it is intended to solve earth pressure balance
When formula shield crossing contains coarse-grained soil stratum and high osmosis bad ground containing fine grained soil stratum, how more efficiently,
Economically improve dregs in shield pressure chamber.By considering that coarse-grained soil stratum and fine grained soil stratum are respectively on shield digging cross section
Ratio is accounted for obtain, the grading curve of dregs after mixing in shield pressure chamber when section driving is obtained by calculation, with shield
It is compared with the particle diameter distribution relation curve that stratum matches, primarily determines the incorporation for needing to mix fine grained soil.To
It can be to avoid coarse-grained soil improvement bring waste and uneconomical be only considered on the section, because coarse-grained soil is improved to Plastic Flow shape
State usually requires to mix the excessive fine grain fine grained soil that contains, or the high molecular polymer that incorporation is more, not only material cost
It is high, and increase pumping program and affect shield driving efficiency.
Technical solution of the invention: high osmosis bad ground shield pressure chamber sediment improvement method, feature exist
In: this method comprises the following steps:
(1) Main Geological Conditions for investigating thoroughly and collecting shield crossing stratum, such as shield section geology vertical and horizontal section, mainly
The permeability and particle size distribution, groundwater level depth, edpth of tunnel of layer；
(2) several representative bad ground operating conditions are selected, according to stratum each under every kind of operating condition in shield crossing section institute
The ratio accounted for, it is assumed that have M stratum, every kind of stratum that can be divided into n grain group within the scope of shield digging section, calculate bad ground pick
Cut the mixed particle size distribution curve of section dregs；
(1)
(2)
……
In formula:
A1, A2..., An--- A soil layer grain group 1, grain group 2 ..., the grogs content (%) of grain group n；
B1, B2..., Bn--- B soil layer grain group 1, grain group 2 ..., the grogs content (%) of grain group n；
……
M1, M2..., Mn--- M soil layer grain group 1, grain group 2 ..., the grogs content (%) of grain group n；
Z1、Z2..., Zn--- the mixed grain group 1 of complex random systems, grain group 2 ..., the grogs content (%) of grain group n；
xA, xB..., xM--- A soil layer, B soil layer ..., M soil layer driving cross section shared by area ratio (%);
(3) by obtained mixed particle size distribution curve and existing earth pressure balanced shield and ground adaptability
Grading curve compares, and preresearch estimates goes out the fine grained partial size for needing to mix in high osmosis bad ground improved, process
And incorporation；
(4) stratum of shield crossing is sampled at the scene, sediment improvement test is carried out on the basis of step 3, is made
Reach Plastic Flow state, to accurately determine sediment improvement outer-penetrating agent type and incorporation.
Beneficial effects of the present invention: the high osmosis for containing coarse-grained soil and fine grained soil the invention proposes shield crossing is complicated
Fine grained fills the hole that coarse granule is formed after being considered as the mixing of the two when stratum, so that dregs particle diameter distribution gradation more adduction
Reason, is more favorable to improve dregs after mixing, can be effectively reduced and usually only consider coarse-grained soil sediment improvement cost, reduces
A large amount of bentonites and high molecular polymer incorporation, not only have higher economic benefit, but also be conducive to the raising of construction efficiency.It is logical
The comparative analysis for crossing multiple engineering practices makes full use of fine grained soil to be very beneficial for the sediment improvement of this bad ground, energy
Improvement cost is enough greatly lowered.
Detailed description of the invention
Fig. 1 is the grading curve schematic diagram of shield Yu soil layer adaptability.
Fig. 2 is right the 25th ring shield driving section clay distribution situation schematic diagram of line.
Fig. 3 is right the 301st ring shield driving section clay distribution situation schematic diagram of line.
Fig. 4 is right line the 25th, 301 ring dregs grading curve schematic diagrames.
Specific embodiment
High osmosis bad ground shield pressure chamber sediment improvement method, includes the following steps:
(1) Main Geological Conditions for investigating thoroughly and collecting shield crossing stratum, such as shield section geology vertical and horizontal section, mainly
The permeability and particle size distribution, groundwater level depth, edpth of tunnel of layer；
(2) several representative bad ground operating conditions are selected, according to stratum each under every kind of operating condition in shield crossing section institute
The ratio accounted for, it is assumed that have M stratum, every kind of stratum that can be divided into n grain group within the scope of shield digging section, calculate bad ground pick
Cut the mixed particle size distribution curve of section dregs；
(1)
(2)
……
In formula:
A1, A2..., An--- A soil layer grain group 1, grain group 2 ..., the grogs content (%) of grain group n；
B1, B2..., Bn--- B soil layer grain group 1, grain group 2 ..., the grogs content (%) of grain group n；
……
M1, M2..., Mn--- M soil layer grain group 1, grain group 2 ..., the grogs content (%) of grain group n；
Z1、Z2..., Zn--- the mixed grain group 1 of complex random systems, grain group 2 ..., the grogs content (%) of grain group n；
xA, xB..., xM--- A soil layer, B soil layer ..., M soil layer driving cross section shared by area ratio (%);
(3) by obtained mixed particle size distribution curve and existing earth pressure balanced shield and ground adaptability
Grading curve compares, and preresearch estimates goes out the fine grained partial size for needing to mix in high osmosis bad ground improved, process
And incorporation；
(4) stratum of shield crossing is sampled at the scene, sediment improvement test is carried out on the basis of step 3, is made
Reach Plastic Flow state, to accurately determine sediment improvement outer-penetrating agent type and incorporation.
In the step (2), when selecting representative high osmosis bad ground operating condition, primarily directed in bad ground
The maximum unfavorable operating condition of coarse grain stratum accounting and each stratum more typical operating condition is distributed on the cross section that shield is tunneled.
Mainly the slump test including dregs or jumping table fluidity are real for sediment improvement test in the step (4)
It tests, pressure permeability test is tested or had to the direct shear test of dregs and dregs pressureless penetration.
Plastic Flow state in the step (4) refers to lower permeability, lower intensity and higher flowing
Property, i.e. permeability < 10-4Cm/s, slump 150-200mm, common direct shear strength internal friction angle < 20 °.
Embodiment 1
No. 21 villages Xian Zhu of Guangzhou Underground are predominantly located on Guangzhou Zengcheng City Guang Shan highway to as ridge section, originate in the village Zhuan Shui
East side Zhu Cunzhan, the way of escape continuation advance eastwards along Guang Shan highway, on the way through multiple planning crossings and closed conduit, approach Guangzhou University
The envisioned ridge station in the east side matsuda institute Yu Yingyuan, wide Shan are generally the civil buildings such as local-style dwelling houses and retail shop on both sides of the road, and house comparatively dense is more
For two to six layers of high building.Shield crossing location basal water is fine sand layer<3-1>, medium-sand seam<3-1>, gravel layer
<3-3>, gravel layer<3-4>and silty clay layer<4N-2>.Underground water preservation in the form of pore ground water, by Atmospheric precipitation and earth's surface
Water supply, watery are medium.
(1) fine sand layer<3-1>is in light gray, yellowish-brown etc., saturation, slightly close~in it is close, part be it is fluffy, predominantly
Fine sand, flour sand, contain sticking grain, and gradation is poor.Its is in uneven thickness, and when sticky content is higher in layer of sand, and infiltration coefficient chooses 5.79
×10-3Cm/s is medium pervious bed.
(2) medium-sand seam<3-2>is in lark, light gray etc., saturation, slightly close~in it is close, part is closely knit shape, mainly by
Middle sand, coarse sand composition, secondary is fine sand, contains sticking grain, and part presss from both sides cobble, and gradation is general.Infiltration coefficient chooses 1.15 × 10-2Cm/s,
For highly permeable layer.
(3) gravel layer<3-3>is in isabelline, canescence etc., saturation, slightly close~in it is close, part is closely knit shape, mainly by gravel
Sand composition, it is secondary be in, coarse sand, contain sticking grain, be locally caught broken stone, gradation is preferable.Infiltration coefficient chooses 2.31 × 10-2Cm/s is strong
Pervious bed.
(4) gravel layer<3-4>be in isabelline, lark, saturation, in it is close, mainly by circle gravel form, it is secondary be dust, in Asia
Round shape, subangular, a small amount of angular, clearance filled sticking grain and sand, part press from both sides cobble, and partial size is generally 5~20mm, maximum
Partial size reaches 40mm.Infiltration coefficient chooses 5.61 × 10-2Cm/s is highly permeable layer.
(5) silty clay layer be in canescence, isabelline etc., plastic shape, saturation, in it is close, be mainly made of sticking grain, powder,
Fine sand, middle sand, organic matter are contained in part, and soil property is more inhomogenous.Infiltration coefficient chooses 1.15 × 10-5Cm/s is aquiclude.
The soil layer that right the 25th ring of line driving encounters is silty clay layer<4N-2>, fine sand layer<3-1>and gravel layer<3-3>
Complex random systems.It is total to account for domain dregs in shield driving section silty clay layer with a thickness of 2.67m according to geology exploration report
The 40.6% of volume；Extra-fine sand thickness 2.49m accounts for the 47.4% of domain dregs total volume；Gravel layer thickness 1.02m, accounts for domain slag
The 12.0% of native total volume.Clay distribution situation is as shown in Figure 2.
The soil layer that right the 301st ring of line driving encounters is silty clay layer<4N-2>, medium-sand seam<3-1>and gravel layer<3-3
> complex random systems.It is total to account for domain dregs in shield driving section silty clay layer with a thickness of 1.23m according to geology exploration report
The 12.2% of volume；Medium coarse sand thickness 3.89m accounts for the 76.6% of domain dregs total volume；Gravel layer thickness 1.16m, accounts for domain slag
The 11.2% of native total volume.Right the 301st ring clay distribution situation of line is as shown in Figure 3.
Each grain group grogs content of right the 25th ring of line and 301 rings is calculated separately, grading curve is drawn.If individually examined
Consider in complex random systems if worst soil layer, the 25th ring is gravelly sand soil layer, and the 301st ring is circle gravel soil layer, gravelly sand soil layer and circle
Gravel soil layer has been in the range that must carry out soil improvement, has sizable challenge using shield machine with soil pressure balance for construction.
But be under the immixture of other soil layers, whole dregs performance be improved significantly, as can see from Figure 4 25 rings dig
Mixing slag soil grading curve is cut to be substantially at without carrying out the region of sediment improvement, and 301 rings then 75mm contents organized
It is obvious inadequate, it requires supplementation with a certain amount of bentonite slurry and is improved.It can also be seen that taking around addedly from Fig. 4
The calcium bentonite of layer quality 4-5% carries out extruding according to swollen water ratio 1:3, forms high concentration bentonite slurry, then every ring needs
Mix 10-13m3(section of jurisdiction ring width 1.5m, shield machine outer diameter 6.28m, every ring digging side amount is 46.4m to calcium bentonite mud3).
When shield scene is tunneled, it is typically incorporating bubble and carries out cutterhead and cutter anti-attrition, while improving the fluidity of dregs.Field monitoring
The infiltration coefficient of 25 ring dregs is 6.8 × 10-5Cm/s, slump 183mm, from the point of view of the case where scene is slagged tap, spiral casting
Device is slagged tap smooth, and dregs stream plasticity is preferable, and ideal statue flow regime has been reached under the premise of not mixing bentonite slurry.
When tunneling 301 ring, since scene is not fully according to enough dense bentonite slurries of injection are required, dregs moisture content is higher,
The partially dilute fluidity of state is bigger than normal, and slag discharge amount is not easy to control, or even gushing for short time occurs.Test the infiltration system of the ring dregs
Number is 1.5 × 10-3Cm/s, slump 210mm have exceeded the requirement of shield dregs Plastic Flow state.
This Engineering Projects, it was confirmed that sediment improvement method provided by the invention be it is feasible, with engineering practice result coincide
Preferably, it is only accounted in the biggish subrange of entire excavated section in medium coarse sand and round gravel stratum and injects dense bentonite slurry progress slag
Land reform is good, so that bentonitic dosage be greatly saved, saves project cost.
Claims (4)
1. high osmosis bad ground shield pressure chamber sediment improvement method, it is characterised in that: this method comprises the following steps:
(1) geological conditions for investigating thoroughly and collecting shield crossing stratum, such as the infiltration of shield section geology vertical and horizontal section, master stratum
Property and particle size distribution, groundwater level depth, edpth of tunnel；
(2) several representative bad ground operating conditions are selected, according to stratum each under every kind of operating condition in shield crossing section shared by
Ratio, it is assumed that have M stratum, every kind of stratum that can be divided into n grain group within the scope of shield digging section, it is disconnected to calculate bad ground digging
The mixed particle size distribution curve of face dregs；
(1)
(2)
……
(n)
In formula:
A1, A2..., An--- A soil layer grain group 1, grain group 2 ..., the grogs mass content (%) of grain group n；
B1, B2..., Bn--- B soil layer grain group 1, grain group 2 ..., the grogs mass content (%) of grain group n；
……
M1, M2..., Mn--- M soil layer grain group 1, grain group 2 ..., the grogs mass content (%) of grain group n；
Z1、Z2..., Zn--- the mixed grain group 1 of complex random systems, grain group 2 ..., the grogs mass content (%) of grain group n；
xA, xB..., xM--- A soil layer, B soil layer ..., M soil layer driving cross section shared by area ratio (%);
(3) by the partial size of obtained mixed particle size distribution curve and existing earth pressure balanced shield and ground adaptability
Distribution curve compares, and preresearch estimates goes out the fine grained partial size for needing to mix in high osmosis bad ground improved, process and mixes
Enter amount；
(4) stratum of shield crossing is sampled at the scene, sediment improvement test is carried out on the basis of step 3, is allowed to reach
To Plastic Flow state, to accurately determine sediment improvement outer-penetrating agent type and incorporation.
2. high osmosis bad ground shield pressure chamber sediment improvement method as described in claim 1, it is characterised in that: described
In step (2), when selecting representative high osmosis bad ground operating condition, accounted for primarily directed to the coarse grain stratum in bad ground
More typical operating condition is distributed on the cross section that shield is tunneled than maximum unfavorable operating condition and each stratum.
3. high osmosis bad ground shield pressure chamber sediment improvement method as described in claim 1, it is characterised in that: step
(4) the sediment improvement test in mainly includes the direct shearing of slump test or the experiment of jumping table fluidity, dregs of dregs
Experiment and the experiment of dregs pressureless penetration have pressure permeability test.
4. high osmosis bad ground shield pressure chamber sediment improvement method as described in claim 1, it is characterised in that: described
Plastic Flow state in step (4) refers to lower permeability, lower intensity and higher mobility, i.e., permeability <
10-4Cm/s, slump 150-200mm, common direct shear strength internal friction angle < 20 °.
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109577993B (en) * | 2018-12-06 | 2020-09-15 | 中交一公局集团有限公司 | Method for determining economic formula for improving thick mud and muck of sandy cobble stratum earth pressure shield |
| CN110566211B (en) * | 2019-09-04 | 2020-11-24 | 中交一公局第三工程有限公司 | Earth pressure shield muck flow plasticity improvement method suitable for sandy gravel stratum |
| CN110863833B (en) * | 2019-11-22 | 2020-12-22 | 中铁隧道局集团有限公司 | Tunneling parameter control process of tunnel shield tunneling starting end boulder area shield tunneling machine |
| CN111402361A (en) * | 2020-03-13 | 2020-07-10 | 广州轨道交通建设监理有限公司 | Geological data processing method, system, device and storage medium |
| CN113775345A (en) * | 2021-09-01 | 2021-12-10 | 浙江杭海城际铁路有限公司 | Method for improving full-section muck in silt layer in construction of connecting channel pipe jacking machine |
| CN115455850B (en) * | 2022-08-29 | 2023-08-15 | 北京交通大学 | Method for calculating distribution of centrifugal pumps of slurry shield circulation system of large-particle-size sandy pebble stratum |
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