CN115491025A - Underwater shield tunnel shock insulation layer polymer elastomer grouting material and application thereof - Google Patents
Underwater shield tunnel shock insulation layer polymer elastomer grouting material and application thereof Download PDFInfo
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- CN115491025A CN115491025A CN202211141213.7A CN202211141213A CN115491025A CN 115491025 A CN115491025 A CN 115491025A CN 202211141213 A CN202211141213 A CN 202211141213A CN 115491025 A CN115491025 A CN 115491025A
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- polyurethane
- insulation layer
- tunnel
- grouting
- grouting material
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- 239000000463 material Substances 0.000 title claims abstract description 72
- 229920001971 elastomer Polymers 0.000 title claims abstract description 32
- 238000009413 insulation Methods 0.000 title claims abstract description 28
- 230000035939 shock Effects 0.000 title claims abstract description 23
- 239000000806 elastomer Substances 0.000 title claims abstract description 17
- 229920000642 polymer Polymers 0.000 title claims abstract description 17
- 239000004814 polyurethane Substances 0.000 claims abstract description 39
- 229920002635 polyurethane Polymers 0.000 claims abstract description 39
- 238000002156 mixing Methods 0.000 claims abstract description 23
- 239000004568 cement Substances 0.000 claims abstract description 18
- 239000000835 fiber Substances 0.000 claims abstract description 15
- 239000005060 rubber Substances 0.000 claims abstract description 15
- 239000000843 powder Substances 0.000 claims abstract description 14
- 238000002955 isolation Methods 0.000 claims description 14
- 238000003756 stirring Methods 0.000 claims description 8
- 238000005303 weighing Methods 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 4
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 3
- 229920000570 polyether Polymers 0.000 claims description 3
- 229920005862 polyol Polymers 0.000 claims description 3
- 150000003077 polyols Chemical class 0.000 claims description 3
- 239000012948 isocyanate Substances 0.000 claims description 2
- 150000002513 isocyanates Chemical class 0.000 claims description 2
- 239000002994 raw material Substances 0.000 claims description 2
- 239000011527 polyurethane coating Substances 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 8
- 230000009471 action Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 4
- 230000004044 response Effects 0.000 abstract description 2
- 230000003938 response to stress Effects 0.000 abstract description 2
- 238000010276 construction Methods 0.000 description 5
- 239000002002 slurry Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000004570 mortar (masonry) Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 229910000278 bentonite Inorganic materials 0.000 description 2
- 239000000440 bentonite Substances 0.000 description 2
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 230000005641 tunneling Effects 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L75/00—Compositions of polyureas or polyurethanes; Compositions of derivatives of such polymers
- C08L75/04—Polyurethanes
- C08L75/08—Polyurethanes from polyethers
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
- C08L2205/16—Fibres; Fibrils
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses a polymer elastomer grouting material for an underwater shield tunnel shock insulation layer, which comprises the following components: polyurethane, cement, rubber powder and PVA fiber; wherein, calculated according to the weight portion, the method comprises the following steps: the mixing amount of the polyurethane is 30-40 parts; the mixing amount of the cement is 40-50 parts; 10-30 parts of rubber powder; the mixing amount of the PVA fiber is 0.1 to 0.3 portion. The grouting material for the shock insulation layer of the underwater shield tunnel, which is prepared by the invention, has excellent performance after being condensed, and has the parameters of the strength of 10Mpa and the elastic modulus of 100Mpa. The shock insulation layer formed by the method has good effects on the stress response and the strain response of the tunnel structure under the action of earthquake. The grouting material has strong impermeability and waterproof performance, and can meet the requirement of the underwater shield tunnel on waterproof performance.
Description
Technical Field
The invention relates to the field of tunnel engineering, in particular to a polymer elastomer grouting material for a tunnel shock insulation layer and application thereof.
Background
The shield method has the advantages of high automation degree, high construction speed, small influence on ground disturbance and the like, and is widely applied to subway tunnels and underwater tunnels. In the construction process, a shield tail gap is formed by a gap between the shield steel shell and the duct piece and a gap formed by overexcavation. If the gap of the shield tail is not treated as the original gap, the soil body generates stress release, and the peripheral foundation is deformed. Therefore, in order to restrain the duct piece, so that the duct piece and the surrounding soil body form a stable structure and ensure that the duct piece is fixed on an expected line position, the shield tunneling machine needs to synchronously carry out grouting on a shield tail gap in the tunneling process, and slurry is solidified to form a transitional contact body between a duct piece structure and surrounding rocks.
The common shield tunnel grouting can be divided into three types, namely cement-based grouting, lime-based grouting and double-liquid grouting, and proper backfill grouting materials are selected according to construction requirements in actual construction. Meanwhile, students have conducted a great deal of research on the backfill grouting material of the shield tunnel, and some novel grouting materials have also been successfully applied to the shield tunnel. However, in the construction process of the shield tunnel, the problems that the tunnel floats upwards due to grouting, a grouting layer is prone to cracking and water seepage, and earthquake damage is easy to happen remain great challenges.
Disclosure of Invention
Aiming at the problems of low strength, poor elasticity and easy cracking of the traditional grouting material in the prior art, the invention aims to provide a polymer elastomer grouting material for a tunnel seismic isolation layer and application thereof.
The purpose of the invention is realized by adopting the following technical scheme:
in a first aspect, the invention provides a polymer elastomer grouting material for a tunnel seismic isolation layer, which comprises the following components: wherein, calculated according to the weight portion, the method comprises the following steps: the mixing amount of the polyurethane is 30-40 parts; the mixing amount of the cement is 40-50 parts; 10-30 parts of rubber powder; the mixing amount of the PVA fiber is 0.1 to 0.3 portion.
Preferably, the polyurethane is a two-component polyurethane comprising a polyurethane black material and a polyurethane white material; wherein the polyurethane black material is isocyanate, the polyurethane white material is polyether polyol, and the mass ratio of the polyurethane black material to the polyurethane white material is 1:1.
preferably, the preparation method of the grouting material for the shock insulation layer of the underwater shield tunnel comprises the following steps:
and weighing the polyurethane, the cement, the rubber powder and the PVA fiber in sequence according to the amount, mixing, and uniformly stirring to obtain a mixed raw material.
More preferably, the preparation method of the grouting material for the seismic isolation layer of the underwater shield tunnel comprises the following steps:
s1, weighing polyurethane black materials, polyurethane white materials, cement, rubber powder and PVA fibers according to the amount for later use;
and S2, mixing cement, rubber powder and PVA fibers according to a ratio, stirring for 1 minute, slowly pouring polyurethane black materials and white materials, and stirring for 2 minutes to obtain the grouting material for the shock insulation layer of the underwater shield tunnel.
In a second aspect, the invention provides application of a polymer elastomer grouting material for a shock insulation layer of a tunnel, and the grouting material for the shock insulation layer of the tunnel is applied to a shock insulation layer of an underwater shield tunnel.
Preferably, the grouting material for the tunnel shock insulation layer is injected into the tunnel grouting layer through grouting holes to form the underwater shield tunnel shock insulation layer.
Preferably, the grouting mode of the polymer elastomer grouting material for the tunnel seismic isolation layer is tunnel wall back grouting.
The invention has the beneficial effects that:
(1) The grouting material for the shock insulation layer of the underwater shield tunnel prepared by the invention has excellent performance after being condensed, and the parameters are that the strength is 10Mpa and the elastic modulus is 100Mpa.
(2) The shock insulation layer formed by the method has good effects on the stress response and the strain response of the tunnel structure under the action of earthquake.
(3) The grouting material disclosed by the invention has stronger impermeability and waterproof performance, and can meet the requirement of an underwater tunnel on waterproof performance.
Drawings
The invention is further illustrated by means of the attached drawings, but the embodiments in the drawings do not constitute any limitation to the invention, and for a person skilled in the art, other drawings can be obtained on the basis of the following drawings without inventive effort.
FIG. 1 is a graph comparing the performance of a grouting material prepared in example 1 of the present invention with that of a general mortar;
FIG. 2 is a cross-sectional view of a tunnel with the present invention in a tunnel engineering application;
FIG. 3 is a graph comparing the opening of a pipe joint of a grouting material prepared in example 1 of the present invention with that of a conventional mortar pipe ring.
Reference numerals are as follows: 1-tunnel lining; 2-seismic isolation layer.
Detailed Description
For the purpose of more clearly illustrating the present invention and more clearly understanding the technical features, objects and advantages of the present invention, the technical solutions of the present invention will now be described in detail below, but are not to be construed as limiting the implementable scope of the present invention.
The invention is further described with reference to the following examples.
Example 1
A polymer elastomer grouting material for a tunnel seismic isolation layer comprises the following components:
polyurethane, cement, rubber powder and PVA fiber;
wherein, according to the weight part, include: the mixing amount of the polyurethane is 35 parts; the mixing amount of the cement is 45 parts; the mixing amount of the rubber powder is 19.8 parts; the blending amount of the PVA fiber is 0.2 part.
The grout obtained by the proportioning has low bleeding rate and shrinkage rate, and can meet grouting requirements. The elastic modulus is between 100Mpa, the texture is softer, the elasticity is better, and the energy dissipation and shock absorption effects can be achieved. The strength of the material exceeds 10MPa, so that the material not only can meet the requirement of bearing capacity, but also can bear the action of impact load.
Comparing the slurry prepared in the embodiment 1 of the invention with the common slurry, the components of the common slurry comprise the following components: cement, water, bentonite, fine aggregate and a water reducing agent. Wherein, the mixing amount of the cement is 20 parts by weight; the mixing amount of water is 15 parts; the mixing amount of the bentonite is 20 parts; the mixing amount of the fine aggregate is 43.8 parts; the parameter of the water reducing agent is 1.2 parts. The results are shown in FIG. 1.
Example 2
The application of the grouting filling material for the ultra-long cross-sea shield tunnel comprises the following steps of weighing polyurethane black materials, polyurethane white materials, cement, rubber sand and PVA fibers according to the mixing ratio; and stirring the cement, the rubber powder and the PVA fiber at a low speed for 1 minute according to different mixing proportions, then slowly pouring the polyurethane black material and the polyurethane white material, and stirring at a low speed for 2 minutes to obtain the polymer elastomer grouting material for the tunnel shock insulation layer.
As shown in the structure diagram of fig. 2, after the polymer elastomer grouting material for the tunnel seismic isolation layer is stirred, slurry can be injected into the grouting holes in the lining in a manner of grouting behind the wall, so that the seismic isolation layer is formed.
Example 3
The general finite element software MIDAS is adopted to analyze the seismic isolation and reduction effect of the tunnel seismic isolation layer formed after the grouting material is constructed, and the result is shown in figure 3. Compared with common mortar, the seismic isolation grouting material can effectively reduce the seismic action stress on the tunnel lining under the action of earthquake, and provides an important means for ensuring the safety of the tunnel structure under the action of earthquake, the durability of the tunnel structure and the long-term stability.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (7)
1. The polymer elastomer grouting material for the tunnel seismic isolation layer is characterized by comprising the following components: polyurethane, cement, rubber powder and PVA fiber; wherein, according to the weight part, include: the mixing amount of the polyurethane is 30-40 parts; the mixing amount of the cement is 40-50 parts; 10-30 parts of rubber powder; the mixing amount of the PVA fiber is 0.1 to 0.3 portion.
2. The polymer elastomer grouting material for a tunnel shock insulation layer according to claim 1, wherein the polyurethane is a two-component polyurethane comprising a polyurethane black material and a polyurethane white material; the polyurethane coating comprises a polyurethane black material, a polyurethane white material, a polyether polyol, a polyurethane black material and a polyurethane white material, wherein the polyurethane black material is isocyanate, the polyurethane white material is polyether polyol, and the mass ratio of the polyurethane black material to the polyurethane white material is 1:1.
3. the grouting material for the shock insulation layer of the underwater shield tunnel according to claim 1, wherein the preparation method of the grouting material for the shock insulation layer of the underwater shield tunnel comprises the following steps:
and weighing the polyurethane, the cement, the rubber powder and the PVA fiber in sequence according to the amount, mixing, and uniformly stirring to obtain a mixed raw material.
4. The grouting material for the shock insulation layer of the underwater shield tunnel according to claim 1, wherein the preparation method of the grouting material for the shock insulation layer of the underwater shield tunnel comprises the following steps:
s1, weighing polyurethane black materials, polyurethane white materials, cement, rubber powder and PVA fibers according to the amount for later use;
and S2, mixing cement, rubber powder and PVA fibers according to a ratio, stirring for 1 minute, slowly pouring polyurethane black materials and white materials, and stirring for 2 minutes to obtain the grouting material for the shock insulation layer of the underwater shield tunnel.
5. The application of the grouting material for the shock-insulation layer of the underwater shield tunnel is characterized in that the grouting material for the polymer elastomer of the shock-insulation layer of the tunnel according to any one of claims 1 to 4 is applied to the shock-insulation layer of the tunnel.
6. The application of the polymer elastomer grouting material for the shock-insulation layer of the underwater shield tunnel according to claim 5, wherein the polymer elastomer grouting material for the shock-insulation layer of the tunnel is grouted to the surface of the underwater shield tunnel through grouting holes to form a shock-insulation layer of the tunnel.
7. The application of the polymer elastomer grouting material for the tunnel seismic isolation layer as claimed in claim 6, wherein the grouting mode of the grouting material for the tunnel seismic isolation layer is tunnel wall back grouting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211141213.7A CN115491025A (en) | 2022-09-20 | 2022-09-20 | Underwater shield tunnel shock insulation layer polymer elastomer grouting material and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211141213.7A CN115491025A (en) | 2022-09-20 | 2022-09-20 | Underwater shield tunnel shock insulation layer polymer elastomer grouting material and application thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115491025A true CN115491025A (en) | 2022-12-20 |
Family
ID=84471411
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211141213.7A Pending CN115491025A (en) | 2022-09-20 | 2022-09-20 | Underwater shield tunnel shock insulation layer polymer elastomer grouting material and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115491025A (en) |
-
2022
- 2022-09-20 CN CN202211141213.7A patent/CN115491025A/en active Pending
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