CN108150179A - 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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- CN108150179A CN108150179A CN201810027837.3A CN201810027837A CN108150179A CN 108150179 A CN108150179 A CN 108150179A CN 201810027837 A CN201810027837 A CN 201810027837A CN 108150179 A CN108150179 A CN 108150179A
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- stratum
- shield
- bad ground
- sediment improvement
- grain
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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
Abstract
The present invention is a kind of high osmosis bad ground shield pressure chamber sediment improvement method, is included the following steps：(1) investigate thoroughly and collect the geological conditions on shield crossing stratum；(2) several representative bad ground operating modes, the ratio according to shared by stratum each under each operating mode in shield crossing section are selected；(3) the obtained grading curve of 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 grain 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:It due to considering coarse granule stratum and fine grained stratum melange effect in bad ground, more tallies with the actual situation compared to only consideration coarse granule stratum sediment improvement, so as 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 technology
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 detaches a large amount of underground water by pressure chamber and the discharge of spiral dumper, the pressure of pressure chamber is caused to drop suddenly, excavation face
It caves in, the safety accidents such as surface subsidence take place frequently.Therefore, shield crossing high permeability formation causes shield engineering circles and academia
Great attention.During 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 experiment, is routinely incorporated into a certain amount of
Outer-penetrating agent, such as bubble, bentonite slurry or calcareous bentonite slurry（Contain 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 mode, 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 grading.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, so as to effectively reduce the improvement of coarse-grained soil
Difficulty.
Invention content
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 being mixed in shield pressure chamber when section driving is obtained by calculation, with shield
The particle diameter distribution relation curve to match with stratum is compared, and primarily determines the incorporation for needing to mix fine grained soil.So as to
It can be to avoid waste that the improvement of coarse-grained soil on the section is brought and uneconomical be only considered, because coarse-grained soil is improved to Plastic Flow shape
State usually requires the excessive high molecular polymer more containing fine grain fine grained soil or incorporation of incorporation, not only material cost
It is high, and increase pumping program and affect shield driving efficiency.
The technical solution of the present invention：High osmosis bad ground shield pressure chamber sediment improvement method, feature exist
In：This method comprises the following steps：
(1) Main Geological Conditions on shield crossing stratum are investigated thoroughly and collect, such as shield section geology vertical and horizontal section, master stratum
Permeability and particle size distribution, groundwater level depth, edpth of tunnel；
(2) several representative bad ground operating modes are selected, according to shared by stratum each under each operating mode in shield crossing section
Ratio, it is assumed that have M stratum, each stratum that can be divided into n grain group in the range of shield digging section, calculate bad ground digging and break
The mixed particle size distribution curve of face dregs；
（1）
（2）
……
In formula：
A1, A2..., An--- A soil layer grains group 1, grain group 2 ..., the grogs content of grain group n（%）；
B1, B2..., Bn--- B soil layer grains group 1, grain group 2 ..., the grogs content of grain group n（%）；
……
M1, M2..., Mn--- M soil layer grains 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 layers, B soil layers ..., M soil layers driving cross section shared by area ratio（%）;
(3) by obtained mixed particle size distribution curve and the grain size of existing earth pressure balanced shield and ground adaptability
Distribution curve is compared, and preresearch estimates goes out in high osmosis bad ground improved, process to need the fine grained mixed grain size and mixes
Enter amount；
(4) stratum of shield crossing is sampled at the scene, sediment improvement experiment is carried out on the basis of step 3, is allowed to reach
To Plastic Flow state, so as to accurately determine sediment improvement outer-penetrating agent type and incorporation.
Beneficial effects of the present invention：The present invention proposes the high osmosis complexity that shield crossing contains coarse-grained soil and fine grained soil
Fine grained fills the hole that coarse granule is formed after the mixing of the two is considered as during stratum so that dregs particle diameter distribution grading more adduction
Reason, is more favorable to improve dregs after mixing, can effectively reduce 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 of multiple engineering practices is crossed, fine grained soil is made full use of to be very beneficial for the sediment improvement of this bad ground, energy
Improvement cost is enough greatly lowered.
Description of the drawings
Fig. 1 is the grading curve schematic diagram of shield and 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 on shield crossing stratum are investigated thoroughly and collect, such as shield section geology vertical and horizontal section, master stratum
Permeability and particle size distribution, groundwater level depth, edpth of tunnel；
(2) several representative bad ground operating modes are selected, according to shared by stratum each under each operating mode in shield crossing section
Ratio, it is assumed that have M stratum, each stratum that can be divided into n grain group in the range of shield digging section, calculate bad ground digging and break
The mixed particle size distribution curve of face dregs；
（1）
（2）
……
In formula：
A1, A2..., An--- A soil layer grains group 1, grain group 2 ..., the grogs content of grain group n（%）；
B1, B2..., Bn--- B soil layer grains group 1, grain group 2 ..., the grogs content of grain group n（%）；
……
M1, M2..., Mn--- M soil layer grains 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 layers, B soil layers ..., M soil layers driving cross section shared by area ratio（%）;
(3) by obtained mixed particle size distribution curve and the grain size of existing earth pressure balanced shield and ground adaptability
Distribution curve is compared, and preresearch estimates goes out in high osmosis bad ground improved, process to need the fine grained mixed grain size and mixes
Enter amount；
(4) stratum of shield crossing is sampled at the scene, sediment improvement experiment is carried out on the basis of step 3, is allowed to reach
To Plastic Flow state, so as to accurately determine sediment improvement outer-penetrating agent type and incorporation.
In the step (2), when selecting representative high osmosis bad ground operating mode, primarily directed in bad ground
The unfavorable operating mode of coarse grain stratum accounting maximum and the cross section tunneled in shield of each stratum on be distributed more typical operating mode.
Mainly the slump test including dregs or jumping table fluidity are real for sediment improvement experiment in the step (4)
It tests, the direct shear test of dregs and dregs pressureless penetration are tested or have pressure permeability test.
Plastic Flow state in the step (4) refers to relatively low permeability, relatively low 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 Xian Zhu villages of Guangzhou Underground are predominantly located to as ridge section on Guangzhou Zengcheng City Guang Shan highways, originate in Zhuan Shui villages east side
Zhu Cunzhan, way of escape continuation advance eastwards along Guang Shan highways, through multiple planning crossings and closed conduit, approach Guangzhou University matsuda in way
In being full of the envisioned ridge station in garden east side, wide Shan is generally the civil buildings such as local-style dwelling houses and retail shop, house comparatively dense, mostly two on both sides of the road for institute
To six floor height buildings.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 is mended by Atmospheric precipitation and surface water
It gives, watery is medium.
（1）Fine sand layer<3-1>In light gray, yellowish-brown etc., saturation, it is slightly close~in it is close, part is fluffy, predominantly
Fine sand, flour sand, containing sticking grain, grading 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>In lark, light gray etc., saturation, it is slightly close~in it is close, part is closely knit shape, mainly by
Middle sand, coarse sand composition, secondary is fine sand, and containing sticking grain, part presss from both sides cobble, and grading is general.Infiltration coefficient chooses 1.15 × 10-2Cm/s,
For highly permeable layer.
（3）Gravel layer<3-3>In isabelline, canescence etc., saturation, it is slightly close~in it is close, part is closely knit shape, mainly by gravel
Sand form, it is secondary be in, coarse sand, containing sticking grain, be locally caught broken stone, grading is preferable.Infiltration coefficient chooses 2.31 × 10-2Cm/s is strong
Pervious bed.
（4）Gravel layer<3-4>In isabelline, lark, saturation, in it is close, be mainly made of circle gravel, it is secondary for dust, in Asia
Round shape, subangular, a small amount of angular, clearance filled sticking grain and sand, part press from both sides cobble, and grain size is generally 5~20mm, maximum
Grain size reaches 40mm.Infiltration coefficient chooses 5.61 × 10-2Cm/s is highly permeable layer.
（5）Silty clay layer is 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.According to geology exploration report, it is 2.67m in shield driving section silty clay layer thickness, it is total accounts for domain dregs
The 40.6% of volume；Extra-fine sand thickness 2.49m accounts for the 47.4% of domain dregs total volume；Gravelly sand 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>'s
Complex random systems.It is 1.23m in shield driving section silty clay layer thickness according to geology exploration report, accounts for domain dregs totality
Long-pending 12.2%；Medium coarse sand thickness 3.89m accounts for the 76.6% of domain dregs total volume；Gravel layer thickness 1.16m, accounts for domain dregs
The 11.2% of 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 respectively, draws grading curve.If individually consider multiple
In miscellaneous soil layer 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, 25 ring diggings as can see from Figure 4 mix
It closes dregs grading curve and is substantially at the region that need not carry out sediment improvement, and then the 75mm contents organized are apparent for 301 rings
Not enough, a certain amount of bentonite slurry is required supplementation with to be improved.It can also be seen that taking around supplement stratum matter from Fig. 4
The calcium bentonite of 4-5% is measured, according to swollen water than 1:3 carry out puffing, formation high concentration bentonite slurry, then every ring needs to mix
10-13m3Calcium bentonite mud（Section of jurisdiction ring width 1.5m, shield machine outer diameter 6.28m, per ring digging side, amount is 46.4m3）.Shield
During the driving of scene, it is typically incorporating bubble and carries out cutterhead and cutter anti-attrition, while improve the fluidity of dregs.The 25th ring of field monitoring
The infiltration coefficient of dregs is 6.8 × 10-5Cm/s, slump 183mm, from the point of view of the situation that scene is slagged tap, spiral dumper goes out
Slag is smooth, and dregs stream plasticity is preferable, and ideal statue flow regime has been reached under the premise of bentonite slurry is not mixed.It is digging
During into 301 ring, since scene is not fully according to enough dense bentonite slurries of injection are required, dregs moisture content is higher, state
Partially dilute fluidity is bigger than normal, and amount of slag is difficult to control or even occurs gushing for short time.The infiltration coefficient for testing the ring dregs 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 is feasible, is coincide with engineering practice result
Preferably, it is only accounted in the larger 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 as to which 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 on shield crossing stratum is investigated thoroughly and collects, 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 modes are selected, according to shared by stratum each under each operating mode in shield crossing section
Ratio, it is assumed that have M stratum, each stratum that can be divided into n grain group in the range of shield digging section, calculate bad ground digging and break
The mixed particle size distribution curve of face dregs；
（1）
（2）
……
In formula：
A1, A2..., An--- A soil layer grains group 1, grain group 2 ..., the grogs mass content of grain group n（%）；
B1, B2..., Bn--- B soil layer grains group 1, grain group 2 ..., the grogs mass content of grain group n（%）；
……
M1, M2..., Mn--- M soil layer grains 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 layers, B soil layers ..., M soil layers driving cross section shared by area ratio（%）;
(3) by obtained mixed particle size distribution curve and the grain size of existing earth pressure balanced shield and ground adaptability
Distribution curve is compared, and preresearch estimates goes out in high osmosis bad ground improved, process to need the fine grained mixed grain size and mixes
Enter amount；
(4) stratum of shield crossing is sampled at the scene, sediment improvement experiment is carried out on the basis of step 3, is allowed to reach
To Plastic Flow state, so as 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：It is described
In step (2), when selecting representative high osmosis bad ground operating mode, accounted for primarily directed to the coarse grain stratum in bad ground
More typical operating mode is distributed on the cross section tunneled than maximum unfavorable operating mode and each stratum in shield.
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 experiment in mainly includes the slump test of dregs or the experiment of jumping table fluidity, the direct shearing 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：It is described
Plastic Flow state in step (4) refers to relatively low permeability, relatively low 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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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109577993A (en) * | 2018-12-06 | 2019-04-05 | 中交公局第三工程有限公司 | The determination method of the dense mud sediment improvement economical formula of sand-pebble layer EPB shield tunneling |
| CN110566211A (en) * | 2019-09-04 | 2019-12-13 | 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 |
| CN110863833A (en) * | 2019-11-22 | 2020-03-06 | 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 |
| WO2021180178A1 (en) * | 2020-03-13 | 2021-09-16 | 广州轨道交通建设监理有限公司 | Geological data processing method, system and apparatus, 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 |
| CN115455850A (en) * | 2022-08-29 | 2022-12-09 | 北京交通大学 | CFD-DEM coupling technology-based distribution calculation method for large-particle-size sandy gravel stratum slurry shield circulation system centrifugal pump |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109577993A (en) * | 2018-12-06 | 2019-04-05 | 中交公局第三工程有限公司 | The determination method of the dense mud sediment improvement economical formula of sand-pebble layer EPB shield tunneling |
| CN110566211A (en) * | 2019-09-04 | 2019-12-13 | 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 |
| 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 |
| CN110863833A (en) * | 2019-11-22 | 2020-03-06 | 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 |
| WO2021180178A1 (en) * | 2020-03-13 | 2021-09-16 | 广州轨道交通建设监理有限公司 | Geological data processing method, system and apparatus, 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 |
| CN115455850A (en) * | 2022-08-29 | 2022-12-09 | 北京交通大学 | CFD-DEM coupling technology-based distribution calculation method for large-particle-size sandy gravel stratum slurry shield circulation system centrifugal pump |
| 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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