CN117888525A - Construction method for back filling of TBM top collapse cavity under mica sheet rock water-rich condition - Google Patents
Construction method for back filling of TBM top collapse cavity under mica sheet rock water-rich condition Download PDFInfo
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- CN117888525A CN117888525A CN202410247352.0A CN202410247352A CN117888525A CN 117888525 A CN117888525 A CN 117888525A CN 202410247352 A CN202410247352 A CN 202410247352A CN 117888525 A CN117888525 A CN 117888525A
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- 239000011435 rock Substances 0.000 title claims abstract description 50
- 238000010276 construction Methods 0.000 title claims abstract description 43
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 239000010445 mica Substances 0.000 title claims abstract description 29
- 229910052618 mica group Inorganic materials 0.000 title claims abstract description 29
- 239000000463 material Substances 0.000 claims abstract description 31
- 238000000034 method Methods 0.000 claims abstract description 21
- 238000005553 drilling Methods 0.000 claims abstract description 18
- 239000002893 slag Substances 0.000 claims abstract description 16
- 238000004140 cleaning Methods 0.000 claims abstract description 12
- 239000002002 slurry Substances 0.000 claims description 17
- 229910000831 Steel Inorganic materials 0.000 claims description 13
- 239000010959 steel Substances 0.000 claims description 13
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 8
- 229920000570 polyether Polymers 0.000 claims description 8
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 7
- 239000003063 flame retardant Substances 0.000 claims description 7
- 239000012948 isocyanate Substances 0.000 claims description 6
- 150000002513 isocyanates Chemical class 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 5
- 239000004035 construction material Substances 0.000 claims description 4
- 238000000638 solvent extraction Methods 0.000 claims description 4
- 239000004575 stone Substances 0.000 claims description 4
- 238000005192 partition Methods 0.000 claims description 3
- 239000002023 wood Substances 0.000 claims description 3
- 229920002635 polyurethane Polymers 0.000 abstract description 8
- 239000004814 polyurethane Substances 0.000 abstract description 8
- 238000005187 foaming Methods 0.000 abstract description 6
- 239000003795 chemical substances by application Substances 0.000 description 5
- 238000009412 basement excavation Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000007596 consolidation process Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 101100366060 Caenorhabditis elegans snap-29 gene Proteins 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 150000003077 polyols Chemical class 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Abstract
The invention relates to the technical field of water conservancy and hydropower construction, in particular to a construction method for back filling a TBM top collapse cavity under a mica sheet rock water-rich condition, which comprises the following steps: closing TBM equipment and protecting the TBM equipment; determining the range and the area of the collapse cavity; laying grouting holes; drilling holes and installing grouting pipes; preparing a backfill material; filling backfill material into the collapsed cavity through the grouting pipe; cleaning slag and finishing backfilling; when the cavity collapse happens under the water-rich geological condition of the mica sheet rock, the grouting holes are planned, the grouting pipes are installed, the backfill material of polyurethane is poured through the grouting pipes, the rapid foaming characteristic of the backfill material is utilized to rapidly expand and solidify, the cavity collapse is filled, the surrounding rock is prevented from being deformed and collapsed continuously, and the collapse body is ensured not to expand continuously. By using the method, the collapse cavity treatment of the small TBM construction under the water-rich condition of the mica sheet rock can be rapidly treated, the treatment time of the collapse cavity is shortened, the surrounding rock is prevented from continuing to collapse and collapse to fall down due to loosening, and the safety risks of TBM equipment and constructors are reduced.
Description
Technical Field
The invention relates to the technical field of water conservancy and hydropower construction, in particular to a construction method for back filling a TBM top collapse cavity under a mica sheet rock water-rich condition.
Background
Along with the development of hydraulic and hydroelectric engineering technology and equipment manufacturing, the small TBM is widely used in the engineering of railways, highways, municipal administration, hydraulic and hydroelectric engineering and the like due to the advantages of strong adaptability, safety, reliability, high construction safety, good construction environment condition, high mechanization degree and the like, can be used for excavating small-section permanent tunnels, can also be used for excavating partial early-stage exploration tunnels, greatly improves the efficiency and footage of tunnel excavation, improves the construction environment in the tunnel, protects the safety of constructors and saves the construction period.
With the application of small TBM to excavate small-section tunnels, the compact TBM is in a double-shield open structure type of a front shield, a splayed hinged oil cylinder and a tight support for adapting to the requirement of small turning radius of 30m, and because the tight support and the hinged oil cylinder occupy space, a construction channel is very narrow, the weak surrounding rock cannot be treated by adopting the traditional large-range advanced pre-reinforcement scheme of the open TBM, when complex geological conditions are encountered, the conditions such as water gushing, collapse and rock burst are frequently encountered, the conditions of cavities and blocking machines are easily caused, particularly when mica sheet rock falls in rich water conditions, the mica sheet rock is softened when the mica sheet rock falls, the collapse is extremely easy to occur, the front rock mass cannot be reinforced by adopting the traditional open TBM grouting, the situation that the front part of the compact small TBM is buried or the cavities is easily caused, the blocking machines of the TBM are caused, and the personal safety of engineering construction period and operators is seriously influenced.
Under the condition, how to quickly backfill construction after the small TBM encounters a cavity collapse under the water-rich geological condition of the mica sheet rock, so that the recovery of the normal tunneling of the TBM becomes a difficult problem of the construction of the compact small TBM under the complex geological condition.
Disclosure of Invention
The invention aims to solve the problems, and provides a construction method for back filling of a cavity collapse at the top of a TBM under a mica sheet rock water-rich condition, which realizes quicker back filling treatment of cavity walls caused by collapse, improves a treatment method for cavity collapse accidents in small TBM construction, protects the stability of the rock walls, prevents slag and block from falling, and reduces the safety risks of TBM personnel and equipment; meanwhile, the cavity collapse accident can be treated quickly, and the construction period extension caused by cavity collapse is reduced.
The invention is realized by the following technical scheme:
a construction method for back filling a collapse cavity at the top of a TBM under a water-rich condition of mica sheet rock comprises the following steps:
the method comprises the steps of firstly, closing TBM equipment and protecting the TBM equipment;
secondly, determining the range and the area of the collapsed cavity;
thirdly, arranging grouting holes;
fourthly, drilling holes and installing grouting pipes;
fifthly, preparing a backfill material;
step six, filling backfilling materials into the collapse cavity through a grouting pipe;
and seventhly, cleaning slag and finishing backfilling.
Specifically, the specific method of the first step includes: after the TBM equipment is closed, the concrete is manually sprayed to seal the rock face, and the front shield, the wood template and the steel wire mesh of the TBM are utilized to support the cavity collapse area.
Specifically, the range of collapsing the cavity in the second step includes: the angular extent of the cavity, the length of the cavity, the height of the cavity, and the area of collapsed cavity is determined by the angular extent of the cavity, the length of the cavity, and the height of the cavity.
Preferably, the specific method of the third step comprises: after determining the range and the area of the collapse cavity, partitioning the collapse cavity, and planning at least one grouting hole in each partition, wherein the position of the grouting hole is controlled within the range of 120-160 degrees of the side arch top.
Specifically, the specific method of the fourth step comprises the following steps: drilling by an air drill, wherein the included angle between the drilling direction and the hole wall is 15-30 degrees;
after drilling, installing the self-advancing hollow anchor rod into the grouting hole, and enabling the front end of the self-advancing hollow anchor rod to be close to surrounding rock in front of the TBM cutterhead;
and a seamless steel pipe is arranged in the inner pipe of the self-advancing hollow anchor rod, and two ends of the seamless steel pipe are respectively and hermetically connected with two ends of the self-advancing hollow anchor rod.
Preferably, the diameter of the self-advancing hollow anchor rod is 28mm, and the diameter of the seamless steel tube is 12mm.
Specifically, the backfill material in the fifth step comprises the following components in percentage by mass:
and (3) combined polyether: 50%;
isocyanate: 50%;
the mass component ratio of the combined polyether is as follows:
A8554：100g；
flame retardant: 30.4g.
Specifically, the specific method of the sixth step includes: and pouring backfill materials through a double-liquid grouting pump by taking the top of the TBM shield body and the stone slag of the side wall as grouting critical surfaces, and finishing pouring of the backfill materials when the grouting end standard is met.
Preferably, the grouting end criteria are:
judging the degree of gap slurry leakage by grouting pressure control and field observation;
grouting the collapse cavity, stopping grouting after slurry leakage occurs, and continuing to perform grouting after the backfill material is foamed;
and repeating the steps until the grouting final pressure is controlled to be 5-7 MPa, stopping pouring, starting pouring again after the slurry is foamed and solidified, and ending the grouting when the slurry leakage phenomenon still occurs.
Specifically, the seventh step of cleaning slag comprises: and cleaning site construction materials and slag materials in front of the TBM.
Compared with the prior art, the invention has the following advantages and beneficial effects:
when the cavity collapse happens under the water-rich geological condition of the mica sheet rock, the grouting holes are planned, the grouting pipes are installed, the backfill material of polyurethane is poured through the grouting pipes, the rapid foaming characteristic of the backfill material is utilized to rapidly expand and solidify, the cavity collapse is filled, the surrounding rock is prevented from being deformed and collapsed continuously, and the collapse body is ensured not to expand continuously. By using the method, the collapse cavity treatment of the small TBM construction under the water-rich condition of the mica sheet rock can be rapidly treated, the treatment time of the collapse cavity is shortened, the surrounding rock is prevented from continuing to collapse and collapse to fall down due to loosening, and the safety risks of TBM equipment and constructors are reduced.
In addition, the invention can also be used for similar engineering, such as the condition treatment of collapse cavity water burst in small TBM construction, the backfill sealing of collapse cavity in underground cavity construction by drilling and blasting method, and the like.
Drawings
The accompanying drawings, which 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 principles of the invention.
Fig. 1 is a schematic flow chart of a construction method for back filling of a TBM top collapse cavity under a mica sheet rock water-rich condition according to the invention.
Fig. 2 is a schematic diagram of the partitioning according to the third step of the present invention.
Fig. 3 is a schematic view showing distribution of a plurality of grouting holes according to the third step of the present invention.
Fig. 4 is a schematic backfill of a sixth step according to the present invention.
Fig. 5 is a schematic view of an on-site water gushing situation according to a second embodiment of the present invention.
Fig. 6 is a schematic diagram of a slump situation in the field according to a second embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and embodiments, for the purpose of making the objects, technical solutions and advantages of the present invention more apparent. It is to be understood that the specific embodiments described herein are merely illustrative of the substances, and not restrictive of the invention.
It should be further noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
Embodiments of the present invention and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Example 1
As shown in fig. 1, in this embodiment, after the cavity collapse shown in fig. 1 occurs, a construction method for backfilling the top cavity collapse of the TBM under the condition of rich water of mica sheet rock is provided, including:
the method comprises the steps of firstly, closing TBM equipment and protecting the TBM equipment; the specific method comprises the following steps: according to the on-site cavity collapse condition, the protection of TBM equipment is finished, after the TBM equipment is closed, C25 concrete is manually sprayed to seal the rock face, a front shield of the TBM, a wood template and a steel wire mesh are utilized to support the cavity collapse area, secondary damage of the TBM caused by re-collapse of the cavity area is prevented, and the construction safety of operators is ensured.
Secondly, determining the range and the area of the collapsed cavity; the range of the collapse cavity comprises: the angular extent of the cavity, the length of the cavity, the height of the cavity, and the area of collapsed cavity is determined by the angular extent of the cavity, the length of the cavity, and the height of the cavity. And measuring the collapsed cavity part according to the site situation and the like, and judging the geological stratum situation of the cavity area according to the site geological engineer.
Thirdly, arranging grouting holes; after determining the range and the area of the collapse cavity, as shown in fig. 2, partitioning the collapse cavity, combining the site space conditions, and planning at least one grouting hole in each partition, wherein the position of the grouting hole is controlled within the range of 120-160 degrees of the side arch top.
As shown in fig. 3, a plurality of grouting holes may be provided, and the plurality of grouting holes may be disposed along the circumference of the TBM excavated new face.
Fourthly, drilling holes and installing grouting pipes; the specific method comprises the following steps:
the air drill is used for drilling, the included angle between the drilling direction and the hole wall is 15-30 degrees, 15-20 degrees are selected in a conventional state, but the range of 20-30 degrees can be adjusted if the local construction difficulty is high and the site practical situation is combined.
After drilling, the self-advancing hollow anchor rod is installed into the grouting hole, and the front end of the self-advancing hollow anchor rod is made to be close to surrounding rock in front of the TBM cutterhead as much as possible.
And a seamless steel pipe is arranged in the inner pipe of the self-advancing hollow anchor rod, and two ends of the seamless steel pipe are respectively in sealing connection with two ends of the self-advancing hollow anchor rod in a welding mode.
In this example, the diameter of the self-advancing hollow anchor is 28mm and the diameter of the seamless steel tube is 12mm.
Fifthly, preparing a backfill material; the backfill material is prepared by mixing two materials, namely polyether and isocyanate, and comprises the following components in percentage by mass: and (3) combined polyether: 50%; isocyanate: 50%;
the mass component ratio of the combined polyether is as follows: a8554 (non-flammable agent): 100g; flame retardant: 30.4g. Wherein A8554 is a model of the combined polyether polyol, and is a disclosed product model.
When in use, A8554 (non-inflammable agent) and flame retardant are mixed according to the proportion of 100g of A8554 (non-inflammable agent) +30.4g of flame retardant, the uniformly mixed sample is yellow transparent liquid, and the uniformly mixed sample is mixed with isocyanate according to the proportion of 1:1 for use.
Step six, filling backfilling materials into the collapse cavity through a grouting pipe;
as shown in fig. 4, the top of the TBM shield body and the stone slag of the side wall are used as grouting critical surfaces, and the backfill material is poured through a double-liquid grouting pump, and when the grouting end standard is met, the pouring of the backfill material is completed. The grouting ending standard is as follows: judging the degree of gap slurry leakage by grouting pressure control and field observation; grouting the collapse cavity, stopping grouting after slurry leakage occurs, and continuing to perform grouting after the backfill material is foamed; and repeating the steps until the grouting final pressure is controlled to be 5-7 MPa, stopping pouring, starting pouring again after the slurry is foamed and solidified, and ending the grouting when the slurry leakage phenomenon still occurs. When the filling pressure reaches 7MPa, the filling pressure is already large, which is theoretically not required for filling the cavity. And when the pressure is reached, the slurry can enter into the gap between rocks, the grouting requirement is met in the cavity,
rapidly foaming, expanding and solidifying by using polyurethane, and filling a collapse cavity; the foaming time is 10s-30s, and is determined according to the site requirement of a construction site, the method mainly aims at backfilling a collapsed cavity to stabilize a rock mass, the site is filled and compacted by rapid foaming and consolidation, the bottom filling sealing surface is consolidated by 10s in combination with the site test, and the top is foamed and consolidated by 10-30 s in combination with the collapse condition of the rock mass.
And seventhly, cleaning slag and finishing backfilling. And cleaning site construction materials and slag materials in front of the TBM. Finishing the construction of backfilling polyurethane in the TBM cavity collapse area; and whether to adopt advanced consolidation grouting to reinforce and backfill rock mass around the collapse cavity can be determined according to the actual condition of the site.
Example two
The embodiment is a specific example, taking geological exploration flat hole engineering of a power station factory as an example.
The total length is 3734.319m, class II and class III surrounding rocks are mainly used, a circular section is adopted, the excavation diameter is 3.53m, a small TBM with the minimum turning radius of 30m and the excavation diameter of 3.53m is adopted for construction. In the construction process, when entering the mica sheet rock area in the period of 2023, 8 months and 6 days, the whole rock is more finished when meeting the mica sheet rock area, and the situation of crushing and water seepage exists locally; the water gushes suddenly in the cutterhead for 7 days of 8 months, and the water gushing quantity is about 40m 3 And/min, the flow speed of water reaches 2.5m/s, the on-site project department adopts protection and slag removal operation, the current is planned to pass through the paragraph rapidly, and the current is 1.6m. The subsequent water inflow is not reduced, and then the mica sheet rock with the range of 180 degrees of the top arch of the TBM front shield is softened when meeting water, collapse situations with different degrees occur, collapse cavities occur at the top and the left side of the TBM front shield, and the TBM cannot normally step when meeting the condition of machine blocking.
FIG. 5 is a schematic view of an in-situ water gushing situation.
And during the period of 8 months and 11 days, the top of the front shield and the top of the propulsion cylinder continuously collapse, the initial highest collapse cavity height is 1.8m, the initial highest collapse cavity height is 4.8m, and a large amount of stone residues are accumulated on the top of the TBM front shield, the propulsion cylinder and the tightening shield, so that the safety of construction machinery and personnel is seriously influenced.
Fig. 6 is a schematic view of the collapse situation in the field.
According to the field situation, the project department surveys the area of the collapse cavity, the geological situation and the like, determines that the scheme of backfilling polyurethane fills the collapse cavity area, and mainly comprises the following construction processes: on-site geological condition analysis, TBM equipment protection, pneumatic drill drilling, installation of grouting pipes, backfill polyurethane grouting, grouting ending and cleaning.
Drilling and installing a grouting pipe: 5 roof arches are arranged at the side of the front shield tail shell of the TBM in one area according to the field space conditions, and phi 28 self-advancing hollow anchor rods are mainly adopted, wherein L=3-4 m and extend into surrounding rocks in front of the cutterhead as far as possible; and phi 12 seamless steel pipes are arranged on the inner pipe, the connection between the end part and the hollow anchor rod is sealed in a welding mode, the drilling arrangement interval is controlled within the range of 120-160 degrees of the side roof arch, the drilling direction and the hole wall are 15-20 degrees, and the actual condition of the local construction site with larger difficulty can be adjusted to the range of 20-30 degrees.
Backfilling polyurethane grouting: the grouting adopts a double-liquid grouting pump, A8554 (non-inflammable agent) and flame retardant are uniformly mixed according to the proportion of 100g A8554 (non-inflammable agent) +30.4g (flame retardant), and the mixture is mixed with isocyanate according to the proportion of 1:1 after uniform mixing.
And (3) finishing grouting: and judging the extent of gap leakage slurry by grouting pressure control and field observation, when grouting final pressure control reaches 5-7 MPa, finding that slurry leakage stops pouring for 1min, restarting pouring after slurry foaming and solidification, and ending grouting when slurry leakage still occurs.
Cleaning: cleaning site construction materials and slag materials in front of the TBM, and preparing for restarting the TBM to step.
The scheme of the cavity part backfill polyurethane treatment is determined from day 8 and 28 of 2023, the TBM is restored to step up to day 9 and 12, the poor geological section is treated for 16 days, and the backfill part is not collapsed and blocked in the following slag removal, treatment and step process.
In the description of the present specification, reference to the terms "one embodiment/manner," "some embodiments/manner," "example," "specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/manner or example is included in at least one embodiment/manner or example of the present application. In this specification, the schematic representations of the above terms are not necessarily for the same embodiment/manner or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, the various embodiments/modes or examples described in this specification and the features of the various embodiments/modes or examples can be combined and combined by persons skilled in the art without contradiction.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless explicitly defined otherwise.
It will be appreciated by persons skilled in the art that the above embodiments are provided for clarity of illustration only and are not intended to limit the scope of the invention. Other variations or modifications of the above-described invention will be apparent to those of skill in the art, and are still within the scope of the invention.
Claims (10)
1. The construction method for back filling of the collapsed cavity at the top of the TBM under the condition of water enrichment of mica sheet rock is characterized by comprising the following steps:
the method comprises the steps of firstly, closing TBM equipment and protecting the TBM equipment;
secondly, determining the range and the area of the collapsed cavity;
thirdly, arranging grouting holes;
fourthly, drilling holes and installing grouting pipes;
fifthly, preparing a backfill material;
step six, filling backfilling materials into the collapse cavity through a grouting pipe;
and seventhly, cleaning slag and finishing backfilling.
2. The construction method for back filling of a TBM top collapse cavity under a mica sheet rock water-rich condition of claim 1, wherein the specific method of the first step comprises the following steps: after the TBM equipment is closed, the concrete is manually sprayed to seal the rock face, and the front shield, the wood template and the steel wire mesh of the TBM are utilized to support the cavity collapse area.
3. The construction method for backfilling the top collapse cavity of the TBM under the condition of rich water of mica sheet rock, which is characterized in that the range of the collapse cavity in the second step comprises the following steps: the angular extent of the cavity, the length of the cavity, the height of the cavity, and the area of collapsed cavity is determined by the angular extent of the cavity, the length of the cavity, and the height of the cavity.
4. The construction method for back filling of a TBM top collapse cavity under a mica sheet rock water-rich condition of claim 1, wherein the specific method of the third step comprises the following steps: after determining the range and the area of the collapse cavity, partitioning the collapse cavity, and planning at least one grouting hole in each partition, wherein the position of the grouting hole is controlled within the range of 120-160 degrees of the side arch top.
5. The construction method for back filling of a TBM top collapse cavity under a mica sheet rock water-rich condition of claim 1, wherein the concrete method of the fourth step comprises the following steps: drilling by an air drill, wherein the included angle between the drilling direction and the hole wall is 15-30 degrees;
after drilling, installing the self-advancing hollow anchor rod into the grouting hole, and enabling the front end of the self-advancing hollow anchor rod to be close to surrounding rock in front of the TBM cutterhead;
and a seamless steel pipe is arranged in the inner pipe of the self-advancing hollow anchor rod, and two ends of the seamless steel pipe are respectively and hermetically connected with two ends of the self-advancing hollow anchor rod.
6. The construction method for TBM top cavity collapse backfill under a mica sheet rock water-rich condition of claim 5, wherein the diameter of the self-advancing hollow anchor rod is 28mm, and the diameter of the seamless steel tube is 12mm.
7. The construction method for back filling of the top collapse cavity of the TBM under the condition of rich water of mica sheet rock, which is characterized in that the back filling material in the fifth step comprises the following components in percentage by mass:
and (3) combined polyether: 50%;
isocyanate: 50%;
the mass component ratio of the combined polyether is as follows:
A8554：100g；
flame retardant: 30.4g.
8. The construction method for back filling of a TBM top collapse cavity under a mica sheet rock water-rich condition of claim 1, wherein the specific method in the sixth step comprises the following steps: and pouring backfill materials through a double-liquid grouting pump by taking the top of the TBM shield body and the stone slag of the side wall as grouting critical surfaces, and finishing pouring of the backfill materials when the grouting end standard is met.
9. The construction method for back filling of the top collapse cavity of the TBM under the condition of rich water of mica sheet rock, which is characterized in that the grouting ending standard is as follows:
judging the degree of gap slurry leakage by grouting pressure control and field observation;
grouting the collapse cavity, stopping grouting after slurry leakage occurs, and continuing to perform grouting after the backfill material is foamed;
and repeating the steps until the grouting final pressure is controlled to be 5-7 MPa, stopping pouring, starting pouring again after the slurry is foamed and solidified, and ending the grouting when the slurry leakage phenomenon still occurs.
10. The construction method for back filling of a TBM top collapse cavity under a mica sheet rock water-rich condition of claim 8, wherein the step of cleaning slag in the seventh step comprises the following steps: and cleaning site construction materials and slag materials in front of the TBM.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410247352.0A CN117888525A (en) | 2024-03-05 | 2024-03-05 | Construction method for back filling of TBM top collapse cavity under mica sheet rock water-rich condition |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410247352.0A CN117888525A (en) | 2024-03-05 | 2024-03-05 | Construction method for back filling of TBM top collapse cavity under mica sheet rock water-rich condition |
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| CN117888525A true CN117888525A (en) | 2024-04-16 |
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| CN202410247352.0A Pending CN117888525A (en) | 2024-03-05 | 2024-03-05 | Construction method for back filling of TBM top collapse cavity under mica sheet rock water-rich condition |
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