CN112963119A - Induced splitting grouting reinforcement method suitable for silt silty soil stratum - Google Patents
Induced splitting grouting reinforcement method suitable for silt silty soil stratum Download PDFInfo
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- 230000002787 reinforcement Effects 0.000 title claims abstract description 109
- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000002689 soil Substances 0.000 title description 25
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 23
- 239000002002 slurry Substances 0.000 claims abstract description 6
- 238000005553 drilling Methods 0.000 claims description 63
- 238000010276 construction Methods 0.000 claims description 13
- 238000013461 design Methods 0.000 claims description 11
- 230000001939 inductive effect Effects 0.000 claims description 9
- 238000004181 pedogenesis Methods 0.000 claims description 8
- 238000009412 basement excavation Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 238000013213 extrapolation Methods 0.000 claims description 2
- 238000003776 cleavage reaction Methods 0.000 claims 2
- 230000007017 scission Effects 0.000 claims 2
- 239000011440 grout Substances 0.000 abstract description 8
- 230000006698 induction Effects 0.000 abstract 1
- 230000008569 process Effects 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000007569 slipcasting Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000005056 compaction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
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Abstract
The invention discloses an induced splitting grouting reinforcement method suitable for a silty silt stratum, which adopts the technical scheme that: a pressure relief drill hole is distributed on one side of the pre-reinforcing area to serve as an induced splitting drill hole, so that the direction of the grout and the grouting pressure of the target reinforcing area are controlled, and the purpose of effectively reinforcing the target reinforcing area is achieved. According to the invention, the pressure relief and induction redistribution are carried out on the ground stress through the drilled holes, and the ground stress is further used as the induced splitting drilled holes, so that the stratum stress of the target reinforcement area is reduced, the slurry trend and the grouting pressure of the target reinforcement area are controlled, and the target reinforcement area of the silt stratum is effectively reinforced.
Description
Technical Field
The invention relates to the field of tunnels and underground engineering, in particular to an induced splitting grouting reinforcement method suitable for silt silty soil stratum.
Background
With the high-speed development of economy in China and the increasing pressure of urban traffic, the China pays more attention to subway engineering construction, but the frequent occurrence of various geological disasters generates key factors which restrict the development of subway engineering in China. In inland cities, particularly main cities along the coasts of yellow rivers, silty soil formations are frequently encountered, and grouting reinforcement of the silty soil formations is a common technical problem in the process of developing underground spaces of cities. Especially, the advanced pre-grouting reinforcement difficulty of the silt soil stratum with sufficient water source supply in the upper-span built subway project is the greatest, and the method mainly comprises the following problems:
(1) the silt silty soil stratum has low strength and poor plasticity, slurry is easy to diffuse randomly in the stratum in the grouting reinforcement process, the grouting reinforcement of a specified position cannot be realized, the grouting final pressure is not high, and the integral reinforcement effect of the whole grouting reinforcement surface is not good;
(2) the silt silty soil stratum has poor water permeability and low compressibility, and the direct grouting reinforcement can cause serious extrusion of the reinforced soil layer and has great influence on the existing buildings;
(3) the roof and the both sides bearing area atress of slip casting reinforcing face are concentrated, if direct reinforcement can lead to the atress district to destroy, can't effectively ensure engineering structural stability.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the induced splitting grouting reinforcement method suitable for the silt soil stratum.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the embodiment of the invention provides an induced splitting grouting reinforcement method suitable for a silty silt stratum.
As a further implementation, the method specifically comprises the following steps:
determining a target grouting reinforcement area;
drilling a first layer of drill holes at the lower part of the grouting reinforcement surface as fracture inducing drill holes, and drilling a second layer of drill holes at the set position at the upper part of the first row of drill holes as grouting reinforcement holes;
drilling the induced splitting drilling hole to the designed sectional depth, drilling the grouting reinforcement holes to the designed sectional depth one by one according to a set sequence, and grouting; after the grouting construction of the first layer of grouting reinforcement holes is completed, all the grouting reinforcement holes of the layer are drilled to the designed sectional depth, and the grouting reinforcement holes of the layer are used as induced splitting drill holes;
drilling a second layer of grouting reinforcement holes at the set position at the upper part of the first layer of grouting reinforcement holes to the designed sectional depth and performing grouting; after the grouting construction of the second layer is completed, drilling all the grouting reinforcement holes of the layer to the designed sectional depth, and using the grouting reinforcement holes of the layer as induced splitting drilling holes;
drilling the next layer in sequence according to the steps until the grouting of the part is finished;
sequentially carrying out drilling grouting reinforcement according to a set sequence, and adopting direct grouting reinforcement on a middle to-be-reinforced area until grouting of the section is finished;
and after the first section of complete grouting, performing next section of grouting construction.
As a further implementation mode, the design of slurry injection of the silty soil stratum is carried out in advance, and then a target grouting reinforcement area is determined.
As a further implementation mode, the grouting design of the silt soil stratum comprises the determination of the length of a single-circulation grouting section, the length of an excavation section, the thickness of a grouting reinforcement ring, drilling parameters, grouting parameters and the type number of grouting materials.
As a further implementation mode, a first layer of drilled holes are drilled at the position, close to the edge, of the lower portion of the grouting reinforcement surface to serve as fracture inducing drilled holes, and a second layer of drilled holes are drilled at the position, 30-50 cm above the first row of drilled holes to serve as grouting reinforcement holes.
As a further implementation, the borehole is one of a horizontal borehole, a depression borehole, an elevation borehole, or an extrapolation borehole.
As a further implementation, the opening depth is lower than the required drilling depth.
As a further implementation mode, grouting reinforcement holes are drilled to the designed subsection depth one by one and grouting is carried out according to the sequence from two sides to the middle.
As a further implementation mode, the drilling, grouting and reinforcing are sequentially carried out according to the sequence of the first lower part, the second left part and the last upper part.
As a further implementation mode, for the part which is not completely reinforced, a set number of fracture-inducing drill holes and grouting reinforcement holes can be drilled in the non-reinforced area for further grouting reinforcement.
The beneficial effects of the above-mentioned embodiment of the present invention are as follows:
when one or more embodiments of the invention are constructed, a plurality of pressure relief drill holes, namely the induced splitting drill holes, are arranged on one side of the pre-reinforcing area of the grouting hole in advance, and due to the existence of the induced splitting drill holes, the ground stress on one side of the induced splitting drill holes is reduced, a weak surface is generated, a splitting space is provided for grout, the grout is induced to generate splitting and local filling compaction towards the induced splitting drill holes, and the grout is controlled to diffuse to the pre-reinforcing area, so that the effective reinforcement of the pre-reinforcing area of the silt silty soil stratum is realized.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic illustration of a silty soil formation prior to grouting reinforcement according to one or more embodiments of the present disclosure;
FIG. 2 is a schematic illustration of a silty soil formation during a borehole drawdown phase in accordance with one or more embodiments of the present invention;
FIG. 3 is a schematic illustration of a silty soil formation consolidated by grouting according to one or more embodiments of the present disclosure;
FIG. 4 is a schematic illustration of a two-layer slip casting according to one or more embodiments of the present disclosure.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an", and/or "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;
for convenience of description, the words "up", "down", "left" and "right" in this application, if any, merely indicate that the directions of movement are consistent with those of the figures themselves, and are not limiting in structure, but merely facilitate the description of the invention and simplify the description, rather than indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting in this application.
The first embodiment is as follows:
as introduced by the background art, the advanced pre-grouting reinforcement difficulty of the silt silty soil stratum with the upper part spanning the built subway engineering and sufficient water source supply around is the greatest, and the method mainly comprises the following problems:
(1) the silt silty soil stratum has low strength and poor plasticity, slurry is easy to diffuse randomly in the stratum in the grouting reinforcement process, grouting reinforcement of a specified position cannot be realized, the grouting final pressure is not high, and the whole reinforcement effect of the whole grouting reinforcement surface is poor.
(2) The silt silty soil stratum has poor water permeability and low compressibility, and the direct grouting reinforcement can cause serious extrusion of the reinforced soil layer and has great influence on the existing buildings.
(3) The roof and the both sides bearing area atress of slip casting reinforcing face are concentrated, if direct reinforcement can lead to the atress district to destroy, can't effectively ensure engineering structural stability.
Therefore, a grouting reinforcement method capable of ensuring the reinforcement effect of the whole reinforcement surface of the silty soil stratum is needed.
The embodiment provides an induced splitting grouting reinforcement method suitable for a silty silt stratum, which is mainly used for advanced pre-grouting reinforcement of the silty silt stratum which spans an established subway project and is provided with sufficient water sources around, and as shown in fig. 1-3, a pressure relief drill hole is arranged to serve as an induced splitting drill hole, the direction of grout and the grouting pressure of a target reinforcement area are controlled, and the purpose of effectively reinforcing the target reinforcement area is achieved.
Furthermore, the induced splitting drill holes are distributed on one side of the pre-reinforcing area to artificially relieve the ground stress of the pre-reinforcing stratum, and the slurry can be induced to split the diffusion direction during grouting, so that the target reinforcing area is effectively reinforced. The silt silty stratum has larger water content and soil body has certain fluidity, so that the soil body with larger fluidity flows out from the induced splitting drill hole under the action of grouting pressure, and the soil body losing fluidity is further reinforced, thereby not only ensuring the reinforcing effect of the reinforced soil body, but also ensuring the stability of the stratum around the reinforced soil body and the stability of the stratum of the whole reinforced area, and ensuring that the existing buildings cannot be greatly damaged.
Due to the existence of the induced splitting drill hole, the ground stress on one side of the pre-reinforcing area is reduced, a weak surface is generated, the induced grout generates splitting and local filling compaction towards the induced splitting drill hole, the grout is controlled to diffuse to the pre-reinforcing area, and the effective reinforcement of the pre-reinforcing area of the silt silty soil stratum is realized by further combining grouting pressure. Because silt matter silt stratum slip casting reinforcing area has roof and both sides pressure-bearing atress to concentrate the district, the inherent pressure-bearing structure can be destroyed in the direct reinforcement, can't effectively ensure engineering structural stability, and induced splitting drilling provides the splitting space for the thick liquid, has both ensured by the effective reinforcement in reinforced district, has guaranteed the holistic safety of pressure-bearing structure again and has stablized.
Further, the concrete construction method is as follows:
(1) and carrying out the grouting design of the silt soil stratum and determining a target grouting reinforcement area.
Wherein, the design content of the slip casting of the silt silty soil stratum section comprises: determining the length of a single-circulation grouting section and the length of an excavation section, the thickness of a grouting reinforcement ring, drilling parameters (drilling interval, drilling arrangement and drilling section length), grouting parameters (grouting rate, grouting final pressure and single-hole grouting amount), grouting material type selection and the like.
(2) And drilling a first layer of drilled holes at the position, close to the edge, of the lower part of the grouting reinforcement surface to serve as induced splitting drilled holes, drilling a second layer of drilled holes at the correct position of the upper part of the first row of drilled holes to serve as grouting reinforcement holes according to design requirements, wherein the drilled holes can be horizontal drilled holes, depression angle drilled holes, elevation angle drilled holes and external insertion drilled holes, and the hole opening depth is lower than the required hole opening depth.
Furthermore, the correct position refers to a position 30-50 cm above the first row of drill holes.
(3) Drilling the induced splitting drilling hole to the designed sectional depth, drilling the grouting reinforcement holes to the designed sectional depth one by one according to the sequence from two sides to the middle, and grouting; and after the grouting construction of the first layer of grouting reinforcement holes is completed, drilling all the grouting reinforcement holes of the layer to the designed sectional depth, and using the grouting reinforcement holes of the layer as induced splitting drilling holes.
(4) Drilling a second layer of grouting reinforcement holes at the correct positions of the upper parts of the first layer of grouting reinforcement holes according to the design requirements to the designed sectional depth, and grouting; similarly, after the grouting construction of the second layer is completed, all grouting reinforcing holes of the layer are drilled to the designed sectional depth, and at the moment, the grouting reinforcing holes of the layer are used as induced splitting holes.
(5) And (5) sequentially drilling the next layer according to the step (4) until the grouting of the part is finished.
(6) According to the sequence of 'first lower, then left and right, and finally upper', drilling and grouting reinforcement are sequentially carried out according to the steps (2), (3), (4) and (5), and a region to be reinforced in the middle part is reinforced by adopting direct grouting until the grouting of the section is finished;
(7) and after the first section of complete grouting is finished, repeating the process to perform the next section of grouting construction.
Further, if a certain part is not completely reinforced by the steps, an appropriate number of fracture inducing drill holes and grouting reinforcing holes can be drilled in the unreinforced area for further grouting reinforcement.
Example two:
the present embodiment further describes the reinforcement method described in the first embodiment with reference to engineering examples.
As shown in fig. 4, this embodiment is described by taking two-layer grouting (hole B, hole C) as an example, and multiple layers of grouting may be performed as necessary.
Furthermore, the grouting scheme adopts forward sectional grouting, the grout adopts cement-water glass double fluid, and the drill hole arrangement is shown in figure 2 and comprises a drill hole A, a drill hole B and a drill hole C, wherein the drill hole A is an induced splitting drill hole, the drill hole B is a grouting hole and is also an induced splitting drill hole, and the drill hole C is a grouting hole. The specific implementation steps are as follows:
(1) firstly, carrying out a silt stratum grouting design and determining a target grouting reinforcement area;
the design content of the grouting of the silt silty soil stratum section comprises the following steps: determining the length of a single-circulation grouting section and the length of an excavation section, the thickness of a grouting reinforcement ring, drilling parameters (drilling interval, drilling arrangement and drilling section length), grouting parameters (grouting rate, grouting final pressure and single-hole grouting amount), grouting material type selection and the like.
(2) And drilling a drilling hole A at the position (less than or equal to 0.5m) close to the edge of the lower part of the grouting reinforcement surface according to the figure 4, drilling a drilling hole B at the correct position (0.3-0.5 m) at the upper part of the drilling hole A according to the design requirement, wherein the drilling holes can be horizontal drilling holes, depression angle drilling holes, elevation angle drilling holes and external insertion drilling holes, and the drilling depth is lower than the required drilling depth.
(3) Drilling the drill hole A to the designed sectional depth, wherein the drill hole A is used as an induced splitting drill hole; the drilling method of the drill hole A can be that the drill hole is drilled from left to right, and can also be that the drill hole is drilled from the middle to the two sides in sequence.
(4) And drilling the drill holes B one by one to the designed sectional depth and simultaneously performing grouting according to the sequence from two sides to the middle, wherein the drill holes B are used as grouting holes.
(5) And after the grouting construction of the drill hole B is completed, drilling the drill hole B to the designed sectional depth, and using the drill hole B as an induced splitting drill hole.
(6) And drilling the drill holes C to the designed sectional depth one by one according to the sequence from two sides to the middle, and grouting, wherein the drill holes C are used as grouting holes.
(7) Finally, according to the sequence of 'first lower, then left, right and finally upper', the steps are repeated to sequentially carry out drilling grouting reinforcement on other parts of the tunnel face, and a middle part to-be-reinforced area is reinforced by adopting direct grouting until the grouting of the section is finished;
(8) and after the first section of complete grouting is finished, repeating the process to perform the next section of grouting construction.
In the above process, if a certain part is not completely reinforced, an appropriate number of fracture inducing drill holes and grouting reinforcement holes can be drilled in the unreinforced area for further grouting reinforcement.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. The induced splitting grouting reinforcement method is characterized in that a pressure relief drill hole is distributed on one side of a pre-reinforcement area to serve as an induced splitting drill hole so as to control the slurry direction and the grouting pressure of a target reinforcement area, and the purpose of effectively reinforcing the target reinforcement area is achieved.
2. The induced splitting grouting reinforcement method suitable for the silty silt stratum according to claim 1, which is characterized by comprising the following steps:
determining a target grouting reinforcement area;
drilling a first layer of drill holes at the lower part of the grouting reinforcement surface as fracture inducing drill holes, and drilling a second layer of drill holes at the set position at the upper part of the first row of drill holes as grouting reinforcement holes;
drilling the induced splitting drilling hole to the designed sectional depth, drilling the grouting reinforcement holes to the designed sectional depth one by one according to a set sequence, and grouting; after the grouting construction of the first layer of grouting reinforcement holes is completed, all the grouting reinforcement holes of the layer are drilled to the designed sectional depth, and the grouting reinforcement holes of the layer are used as induced splitting drill holes;
drilling a second layer of grouting reinforcement holes at the set position at the upper part of the first layer of grouting reinforcement holes to the designed sectional depth and performing grouting; after the grouting construction of the second layer is completed, drilling all the grouting reinforcement holes of the layer to the designed sectional depth, and using the grouting reinforcement holes of the layer as induced splitting drilling holes;
drilling the next layer in sequence according to the steps until the grouting of the part is finished;
sequentially carrying out drilling grouting reinforcement according to a set sequence, and adopting direct grouting reinforcement on a middle to-be-reinforced area until grouting of the section is finished;
and after the first section of complete grouting, performing next section of grouting construction.
3. The induced splitting grouting reinforcement method suitable for the silty silt stratum according to claim 2, characterized in that a design of grouting for the silty silt stratum is performed in advance, and then a target grouting reinforcement area is determined.
4. The induced splitting grouting reinforcement method suitable for the silty silt stratum according to claim 3, wherein the grouting design of the silty silt stratum comprises determination of the length of a single-circulation grouting section, the length of an excavation section, the thickness of a grouting reinforcement ring, drilling parameters, grouting parameters and the type number of grouting materials.
5. The method for induced splitting grouting reinforcement of the silty silt stratum according to claim 2, wherein a first layer of drilled holes is drilled at the position, close to the edge, of the lower portion of the grouting reinforcement surface to serve as induced splitting drilled holes, and a second layer of drilled holes is drilled 30-50 cm above the first row of drilled holes to serve as grouting reinforcement holes.
6. The method for inducing fracture grouting reinforcement for silt silty soil formations according to claim 5, wherein the drill hole is one of a horizontal drill hole, a depression angle drill hole, an elevation angle drill hole or an extrapolation drill hole.
7. The method for induced fracture grouting reinforcement of the silty silt soil formation according to claim 5, wherein the depth of the opening is lower than the required drilling depth.
8. The induced splitting grouting reinforcement method suitable for the silty silt stratum according to claim 2, wherein grouting reinforcement holes are drilled to the designed segmental depth one by one and grouting is performed according to the sequence from two sides to the middle.
9. The induced splitting grouting reinforcement method suitable for the silty silt stratum according to claim 2, characterized in that drilling grouting reinforcement is sequentially performed according to the sequence of first, second, left and right, and last.
10. The method for inducing cleavage grouting reinforcement suitable for the silty silt soil formation, according to claim 2, wherein for the part which is not completely reinforced, a set number of cleavage inducing drill holes and grouting reinforcement holes can be drilled in the unreinforced area for further grouting reinforcement.
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| CN202110149804.8A CN112963119A (en) | 2021-02-03 | 2021-02-03 | Induced splitting grouting reinforcement method suitable for silt silty soil stratum |
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| CN202110149804.8A CN112963119A (en) | 2021-02-03 | 2021-02-03 | Induced splitting grouting reinforcement method suitable for silt silty soil stratum |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116025367A (en) * | 2022-10-28 | 2023-04-28 | 中国海洋大学 | Pre-applied horizontal stress, induced splitting and localized combined grouting reinforcement device and process |
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| CN109162736A (en) * | 2018-10-26 | 2019-01-08 | 中国矿业大学 | A kind of liquid mixed deep hole circulation Application of High pressure Split Grouting method of air-water mud |
| CN112195924A (en) * | 2020-09-26 | 2021-01-08 | 北京市市政三建设工程有限责任公司 | Method for reinforcing foundation pit base of silt silty clay layer |
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2021
- 2021-02-03 CN CN202110149804.8A patent/CN112963119A/en active Pending
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| CN101260667A (en) * | 2008-04-25 | 2008-09-10 | 南京工业大学 | Given force splitting mud jacking enhancement type composite foundation construction method |
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| CN116025367A (en) * | 2022-10-28 | 2023-04-28 | 中国海洋大学 | Pre-applied horizontal stress, induced splitting and localized combined grouting reinforcement device and process |
| CN116025367B (en) * | 2022-10-28 | 2023-11-21 | 中国海洋大学 | Pre-applied horizontal stress, induced splitting and localized combined grouting reinforcement device and process |
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