CN112281798A - Application method of TG reinforcement belt in high backfill soil foundation of transformer substation - Google Patents
Application method of TG reinforcement belt in high backfill soil foundation of transformer substation Download PDFInfo
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- CN112281798A CN112281798A CN202011152234.XA CN202011152234A CN112281798A CN 112281798 A CN112281798 A CN 112281798A CN 202011152234 A CN202011152234 A CN 202011152234A CN 112281798 A CN112281798 A CN 112281798A
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- foundation
- reinforcement
- layer
- soil
- transformer substation
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/005—Soil-conditioning by mixing with fibrous materials, filaments, open mesh or the like
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H5/00—Buildings or groups of buildings for industrial or agricultural purposes
- E04H5/02—Buildings or groups of buildings for industrial purposes, e.g. for power-plants or factories
- E04H5/04—Transformer houses; Substations or switchgear houses
Abstract
The invention relates to the field of foundation treatment of soft soil of a transformer substation, in particular to an application method of a TG reinforcement belt in a high backfill soil foundation of the transformer substation; laying two layers of TG reinforcing belts in the lime soil replacement range, wherein the distance between the first layer of reinforcing belt and the top surface of the cushion layer is 0.9m, the distance between the second layer of reinforcing belt and the top surface of the cushion layer is 2.1m, the distance between the two layers of reinforcing belts is 500mm, and the two layers of TG reinforcing belts are distributed in a grid shape; according to the invention, through the capabilities of stress diffusion, stress distribution adjustment, lateral limitation enhancement and the like of the reinforced cushion layer with higher rigidity, the lateral extrusion and bulging of soft foundation soil are prevented, the purposes of reducing the settlement deformation of the foundation and exerting the foundation potential of a soft underlying layer in a natural state are achieved, the deformation of the foundation is effectively reduced, the stability of the foundation is effectively increased, and the bearing capacity of the foundation can be better improved; the technical problem of uneven settlement of structures in a high backfill soil area is solved.
Description
Technical Field
The invention relates to the field of foundation treatment of soft soil of a transformer substation, in particular to an application method of a TG reinforcement belt in a high backfill soil foundation of the transformer substation.
Background
The method for replacing and filling lime soil is a common foundation treatment method for a transformer substation, wherein lime soil cushion layers are made of lime and soil, and the volume ratio of the lime to the soil is generally 3: 7 or 2: 8. the lime soil foundation construction process is simple, the cost is low, the method is a foundation reinforcement method which is wide in application, economical and practical, and is suitable for reinforcement treatment of soft soil layers with the thickness of 1-3 m.
When high backfill areas are met, structures with shallow burial depths in a transformer substation, such as foundations of enclosing walls, terrace roads, cable ducts, equipment and the like, can be theoretically solved by adopting a method of treating a lime soil cushion foundation, but the foundation is unevenly settled due to genetic geology reasons of the high backfill and the weak soil, so that the structures have local cracks, and the structures have to be repaired when the structures are serious.
Disclosure of Invention
The invention provides an application method of a TG reinforcement belt in a high backfill soil foundation of a transformer substation, aiming at solving the technical problem of uneven settlement of structures in a high backfill soil area.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the application method of the TG reinforcement belts in the high backfill soil foundation of the transformer substation comprises the steps of paving two layers of TG reinforcement belts in the range of lime soil replacement, enabling the distance between a first layer of reinforcement materials and a cushion top surface to be 0.9m, enabling two layers of reinforcement materials to be 2.1m, enabling the distance between the first layer of reinforcement materials and the cushion top surface to be 500mm, and enabling the two layers of TG reinforcement belts to be distributed in a grid shape.
The TG belt is a geotechnical composite material which is formed by specially processing polymer compounds such as polypropylene (polypropylene), terylene (polyester) and the like and core materials. The composite material can be used for increasing the stability of rock and soil or improving the bearing capacity in geotechnical engineering.
The foundation is made into an integral flexible cushion layer by laying 2 layers of TG reinforcing belts in the replacement filling soil, and because the reinforcing belts are tightly attached to the replacement filling soil and have a certain modulus far higher than that of the reinforced soft foundation soil, larger internal stress is generated in the geotechnical reinforcing belts, so that part of additional building load is offset, and simultaneously, the load is uniformly transmitted and diffused to the foundation soil, the deformation of the foundation is effectively reduced to a certain extent, the stability of the foundation is increased, and the bearing capacity of the foundation can be better improved.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, through the capabilities of stress diffusion, stress distribution adjustment, lateral limitation enhancement and the like of the reinforced cushion layer with higher rigidity, the lateral extrusion and bulging of soft foundation soil are prevented, the purposes of reducing the settlement deformation of the foundation and exerting the foundation potential of a soft underlying layer in a natural state are achieved, the deformation of the foundation is effectively reduced, the stability of the foundation is effectively increased, and the bearing capacity of the foundation can be better improved; the technical problem of uneven settlement of structures in a high backfill soil area is solved.
Drawings
Fig. 1 is a sectional illustration of TG reinforced belts in a high backfill soil foundation of a substation.
Fig. 2 is an analysis diagram of a limit equilibrium stress circle before and after reinforcement.
The figures are labeled as follows:
1-miscellaneous fill layer, 2-replacement fill grey soil layer, 3-plain soil layer, 4-TG reinforced belt and 5-bent part of end reinforced belt.
Detailed Description
The present invention is further illustrated by the following specific examples.
Examples
The application method of the TG reinforcement belts in the high backfill soil foundation of the transformer substation comprises the steps of paving two layers of TG reinforcement belts in the range of lime soil replacement, enabling the distance between a first layer of reinforcement materials and a cushion top surface to be 0.9m, enabling two layers of reinforcement materials to be 2.1m, enabling the distance between the first layer of reinforcement materials and the cushion top surface to be 500mm, and enabling the two layers of TG reinforcement belts to be distributed in a grid shape.
Furthermore, the interval that TG adds muscle area is the grid form and distributes is 350x350mm, and the both ends that lie in the border department all around of lime-soil replacement and filling scope bend upward to the horizontality, and bend length is not less than 3.0 m.
Furthermore, the joint of the TG ribbed belt in a grid shape is fixed by a nail-joint method.
The improvement of the overall strength of the reinforced composite cushion layer can be further analyzed by comparing the limit balance stress circles before and after the reinforcement at the same position in the cushion layer as follows, and the figure is shown in figure 2:
in the figure, the maximum principal stress when the unreinforced cushion layer reaches the ultimate equilibrium state is sigma1. The confining stress is σ3(stress circle I); the side limit stress increment is Δ when the cushion layer reaches the limit balance state after being reinforced3The major stress increment is Δ1A stress circle III. Therefore, the side limiting effect of the composite cushion layer is increased after the reinforcing band is added in the cushion layer, and the bearing capacity of the composite cushion layer is correspondingly improved. In addition, the shear strength envelope of the stress circle i when no reinforcement is provided is τ = σ tg β, and the side confining pressure σ is assumed after reinforcement3. The shear strength envelope of the stress circle II is tau = sigma tg beta + c when the stress circle is unchanged, which shows that the shear strength of the reinforced cushion layer is increased by a c value, the composite cushion layer has the 'cohesive force', and the c value is called the 'quasi-cohesive force'. Summarizing the above description, the main working mechanism of the reinforced composite cushion layer for reinforcing the stratum is as follows: through the capabilities of stress diffusion, stress distribution adjustment, lateral limitation enhancement and the like of the reinforced cushion layer with higher rigidity, the lateral extrusion and uplift of the soft foundation soil are prevented, and the purposes of reducing the settlement deformation of the foundation and exerting the foundation potential of the soft underlying layer in a natural state are achieved.
Claims (3)
1. The application method of the TG reinforcement belts in the high backfill soil foundation of the transformer substation is characterized in that two layers of TG reinforcement belts are laid in the range of the lime soil replacement, the distance between a first layer of reinforcement and a top surface of a cushion layer is 0.9m, the distance between a second layer of reinforcement and the top surface of the cushion layer is 2.1m, the distance between the first layer of reinforcement and the top surface of the cushion layer is 500mm, and the two layers of TG reinforcement belts are distributed in a grid shape.
2. The application method of the TG reinforcement belt in the high backfill soil foundation of the transformer substation according to claim 1, wherein the TG reinforcement belt is distributed in a grid shape, the distance between the TG reinforcement belt and the grid shape is 350x350mm, two ends of the TG reinforcement belt located on the peripheral boundary of the lime soil replacement range are bent upwards to be in a horizontal state, and the bending length is not less than 3.0 m.
3. The application method of the TG reinforcement belt in the high backfill soil foundation of the transformer substation according to claim 2, wherein the joints of the TG reinforcement belt distributed in a grid shape are fixed by a nail joint method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011152234.XA CN112281798A (en) | 2020-10-26 | 2020-10-26 | Application method of TG reinforcement belt in high backfill soil foundation of transformer substation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011152234.XA CN112281798A (en) | 2020-10-26 | 2020-10-26 | Application method of TG reinforcement belt in high backfill soil foundation of transformer substation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112281798A true CN112281798A (en) | 2021-01-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011152234.XA Pending CN112281798A (en) | 2020-10-26 | 2020-10-26 | Application method of TG reinforcement belt in high backfill soil foundation of transformer substation |
Country Status (1)
| Country | Link |
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| CN (1) | CN112281798A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6280120B1 (en) * | 1998-07-27 | 2001-08-28 | Nippon Shokubai Co., Ltd. | Adhesion preventing method and support body extracting method |
| CN111549598A (en) * | 2020-04-26 | 2020-08-18 | 武汉理工大学 | Collapsible loess area highway reinforced bridgehead roadbed and construction method |
-
2020
- 2020-10-26 CN CN202011152234.XA patent/CN112281798A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6280120B1 (en) * | 1998-07-27 | 2001-08-28 | Nippon Shokubai Co., Ltd. | Adhesion preventing method and support body extracting method |
| CN111549598A (en) * | 2020-04-26 | 2020-08-18 | 武汉理工大学 | Collapsible loess area highway reinforced bridgehead roadbed and construction method |
Non-Patent Citations (1)
| Title |
|---|
| 李林: ""邮电3号楼加筋土复合垫层地基处理"", 《山西建筑》 * |
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Application publication date: 20210129 |
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| RJ01 | Rejection of invention patent application after publication |