CN212896290U - Reinforced earth stone replacement and filling foundation structure of soft soil foundation - Google Patents
Reinforced earth stone replacement and filling foundation structure of soft soil foundation Download PDFInfo
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- CN212896290U CN212896290U CN202021134864.XU CN202021134864U CN212896290U CN 212896290 U CN212896290 U CN 212896290U CN 202021134864 U CN202021134864 U CN 202021134864U CN 212896290 U CN212896290 U CN 212896290U
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Abstract
The utility model relates to a soft soil foundation adds muscle stone and trades and fill foundation structure, including geogrid, the inside engineering soil layer that has wrapped of geogrid, engineering soil layer top is provided with the graded gravel layer, be provided with retaining wall on the graded gravel layer, retaining wall is including the wall bottom plate that is located retaining wall bottom and the wall body that is located wall bottom plate upper portion, geogrid, engineering soil layer and graded gravel layer both sides trade the sideline of filling out for the basis, the basis trades the sideline and excavates the sideline and is the inverted triangle-shaped setting. The utility model discloses a set up geogrid, engineering soil and gradation rubble and play tensile and shear strength through geogrid and make loose engineering soil become an organic whole, through the resistance to compression of gradation rubble and anti-straining make ground bearing capacity reinforcing, groundwater discharge easily, and then reach the effect that increases whole ground steadiness ability through the structure is deep into the underground, guaranteed the normal construction of retaining wall on the weak soil ground.
Description
Technical Field
The utility model relates to a lower part basis such as hydraulic retaining wall, hydraulic building trades and fills technical field, specifically is a soft soil foundation reinforced earth stone trades and fills foundation structure.
Background
Soft soil generally refers to cohesive soil in soft plastic and flow plastic states with large natural water content, high compressibility, low bearing capacity and very low shear strength, soft soil is a generic name of a kind of soil and does not refer to a specific soil, and engineering often subdivides soft soil into soft cohesive soil, mucky soil, silt, peat and the like, and has the characteristics of high natural water content, large natural pore ratio, high compressibility, low shear strength, small consolidation coefficient, long consolidation time, high sensitivity, large disturbance, poor water permeability, complex soil layer layered distribution, large difference of physical and mechanical properties among layers and the like.
However, the existing foundation replacement and filling methods have limited problems, for example, some engineering areas or the nearby areas do not have a large amount of cohesive soil or stone materials, some replacement and filling materials are not suitable for large-volume deep-soil fixation, and excavation operation is inconvenient for replacing and filling foundation pits in marshlands or soft soil foundations, so that the foundation replacement and filling methods have great limitations.
SUMMERY OF THE UTILITY MODEL
The not enough to prior art, the utility model provides a soft soil foundation reinforced earth stone trades fills foundation structure possesses the advantage that need not desilting, whole compaction are fixed and be suitable for various sizes of filling that trade, has solved soft soil foundation and has traded and fill lack cohesive soil or building stones around the foundation ditch, inconvenient large tracts of land desilting excavation or fixed limitation problem.
For the above-mentioned purpose that need not desilting, whole crowded densely fixing and be suitable for various ground and trade the form of filling, the utility model provides a following technical scheme:
the utility model provides a soft soil foundation reinforced soil stone trades fills foundation structure, includes geogrid, the inside package of geogrid has the engineering soil layer, engineering soil layer top is provided with the graduation metalling of joining in marriage, be provided with retaining wall on the graduation metalling of joining in marriage, retaining wall is including the wall bottom plate that is located retaining wall bottom and the wall body that is located wall bottom plate upper portion, geogrid, engineering soil layer and graduation metalling both sides are traded for the basis and are filled the sideline, the basis is traded and is filled the sideline and excavate the sideline and be the setting of inverted triangle-shaped.
Preferably, a cushion layer is further arranged between the graded broken stone layer and the wall bottom plate.
Preferably, the slope ratio of the foundation edge-changing and filling line to the excavation edge line is 1: 1.5.
Preferably, the original excavation soil or the replacement filling material is used for backfilling between the foundation replacement filling side line and the excavation side line.
Preferably, the foundation replacement and filling side line is an outer side line of a reinforced earth stone replacement and filling foundation of the soft soil foundation.
Preferably, the type of the geogrid is TGGS40-40 type bidirectional geogrid.
Preferably, the geogrid is a single layer or two or more layers; the engineering soil layer is a single layer or two or more layers, and the thickness of the engineering soil layer wrapped between every two layers of geogrids is not more than 0.5 m.
Compared with the prior art, the utility model provides a soft soil foundation reinforced earth stone trades fills basic processing technology possesses following beneficial effect:
1. this soft soil foundation reinforced earth stone trades fills foundation structure, through rational utilization geogrid, engineering soil and gradation rubble play tensile and shear strength that can make loose engineering soil become one through geogrid, the resistance to compression and the anti-reinforcement that strain through gradation rubble make the foundation bearing capacity strengthen, groundwater discharges easily, and then reach the effect that increases whole foundation steadiness ability through the structure is deep into secret flattening compaction, the normal construction of retaining wall or hydraulic structure on soft soil foundation has been guaranteed, thereby reach the assumption of being convenient for plan bad district retaining wall or building construction.
2. This soft soil foundation reinforced soil stone trades fills foundation structure plays through setting up geogrid, engineering soil and gradation rubble and crowds each other closely the effect that reaches the desilting of need not excavating through engineering soil and mucky soil, and then reaches the effect that diffusion stress, adjustment differential settlement, increase foundation bearing capacity and stability, adjusts suitable thickness and the treatment scope of trading according to the soil property in different places, reaches the effect that is convenient for retaining wall or building foundation to support.
3. This soft soil foundation reinforced earth stone trades fills foundation structure has fully embodied greenness nature, feature of environmental protection design theory.
The term "engineering soil" generally refers to high-strength hard blocks such as waste concrete and bricks and tiles generated by the removal of buildings. The engineering soil has the greatest characteristics of low price, high strength, large occupied area and influence on ecological environment. If enough engineering soil exists near the engineering area, the engineering soil, the graded broken stone and the geogrid are integrated and used for treating a soft soil foundation or a silt foundation, so that the bearing capacity of the foundation can be improved, local materials can be obtained, the engineering investment is greatly saved, meanwhile, the bad ecological environment generated by piling the engineering soil around the engineering is solved, and the design concept of changing waste into valuables and achieving multiple purposes in an environment-friendly manner is realized.
Drawings
Fig. 1 is a schematic structural view of the present invention;
in the figure: the soil engineering structure comprises 1 geogrid, 2 engineering soil layers, 3-level gravel layers, 4 cushion layers, 5 foundation replacement and filling sidelines, 6 excavation sidelines, 7 current situation ground, 8 wall bottom plates, 9 wall bodies and 10 retaining walls.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all embodiments. Based on the embodiment of the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.
Referring to fig. 1, a reinforced earth-rock replacement foundation structure for a soft soil foundation comprises a geogrid 1, wherein the bottom of the geogrid 1 is an original soft soil foundation, an engineering soil layer 2 is arranged above the geogrid 1, the thickness of the compacted layer of the engineering soil layer 2 is 0.5m, the compaction degree is not less than 0.91, a geogrid 1 is laid above the engineering soil layer 2, a layer of engineering soil layer 2 is laid above the geogrid 1, the thickness of the compacted layer of the engineering soil layer 2 is 0.5m, the compaction degree is not less than 0.91, a geogrid 1 is laid above the engineering soil layer 2, a graded gravel layer 3 is arranged above the geogrid 1, the thickness of the compacted layer of the graded gravel layer 3 is 0.5m, and the compaction degree is not less than 0.91. The top of the graded gravel layer 3 is a C10 concrete cushion 4 with a layer thickness of 0.1 m. The upper part of the cushion layer 4 is a reinforced concrete retaining wall bottom plate 8 and a wall body 9, and the treatment ranges of the foundations on the two sides of the retaining wall bottom plate 8 are respectively 3.0m on the left side and the right side. The foundation replacement and filling thickness H is 1.5 m. The slope ratio of the foundation replacement and filling sideline 5 to the excavation sideline 6 is 1:1.5, the foundation replacement and filling sidelines 5 on the two sides are filled with replacement and filling materials, and the space between the foundation replacement and filling sideline 5 and the excavation sideline 6 can be refilled with original excavation soil or refilled and compacted with the replacement and filling materials.
The geogrid 1 is high in tensile strength and shear strength, high in flexibility and integrity and capable of effectively increasing the stability of a foundation, and due to the constraint of the reinforcing rib layer, the shearing, lateral extrusion and uplifting of foundation soil are limited integrally; the geogrid 1 is internally wrapped with an engineering soil layer 2 with a certain thickness, the engineering soil layer 2 is used for backfilling and compacting a soft soil layer, and can be divided into one layer or a plurality of layers according to actual conditions or different replacement and filling thicknesses, so that a pressure diffusion angle is increased, upper load diffusion is facilitated, the bottom surface pressure of a replacement and filling structure is reduced, uneven settlement is adjusted, and a foundation is laid for smooth laying of an upper-layer crushed stone layer 3; the graded crushed stone layer 3 is positioned at the top of the replacement filling structure and is used for connecting the engineering soil layer 2 with the lower cushion layer 4 of the retaining wall, the compressive strength is high, the reverse filtration performance is good, the bearing capacity of the foundation can be greatly improved, the uplift pressure of the foundation caused by underground water is reduced, and the foundation structure stability of the retaining wall 10 is ensured; the cushion layer 4 is positioned below the wall bottom plate 8, is generally 10cm thick and is used for leveling a base surface before the retaining wall 10 is poured; the foundation replacement and filling sideline 5 is an outer sideline of a reinforced earth and stone replacement and filling foundation of a soft soil foundation, the foundation treatment range is larger than that of the retaining wall 10 or a building base, the width of each side exceeding the outer edge of the retaining wall 10 or the building base is 1/3-1/2 of the treatment depth required by design, and the width of each side exceeding the outer edge of the retaining wall 10 or the building base is not smaller than 3.0 m.
The utility model discloses the model of geogrid 1 is the two-way geogrid of TGGS40-40 type among the embodiment, and the percentage elongation is 5%, and it is indulged, horizontal tensile strength is 40kN/m, because of geogrid width 4m, retaining wall 10 base is wide 6m, so lay two wide geogrids 1 of overlap joint 2m below the retaining wall, vertically lay along retaining wall length direction. The overlapping width of the geogrid 1 is not less than 0.3m, overlapping seams are bound by plastic belts, and the binding distance is 50 cm. The geogrid 1 should be laid smoothly and straightened, and not curled or twisted, and a certain tightness is maintained, and the local fluctuation difference is not more than 5 cm. And fixing the laid geogrids 1 on the ground by U-shaped nails every 1.5m, and ensuring that the geogrids 1 are tightly attached to the lower bearing surface. The bonding strength of the geogrid 1 should not be lower than the tensile strength of the raw material. The laid geogrid 1 should be backfilled in time to prevent sun aging, the exposure time of the rib materials should not exceed 24 hours, and the sun exposure time should not be longer than 8 hours. The direct rolling of the material conveying vehicle on the paved and tensioned grid is avoided. The observation of foundation settlement and lateral displacement is enhanced in the construction, and the foundation instability is prevented.
The geogrids 1 are laid along the cross section of the foundation structure for replacement and filling, the two ends of each layer of geogrids 1 need to be wrapped back, the longitudinal and transverse wrapping lengths are not less than 1.5m and 2m respectively, and wrapping sections are folded back to cover the compacted filling surface, so that the geogrids are smooth and suitable.
The lap joints of the upper and lower layers of geogrids 1 are staggered, and the staggered length is not less than 50 cm.
The geogrid 1 is laid between engineering soil and between the engineering soil and graded broken stones, so that a material conveying vehicle is prevented from directly rolling on the laid, tensioned and positioned geogrid 1.
The engineering soil layer 2 mainly comprises concrete blocks or bricks, tiles and gravel blocks formed by dismantling buildings, and the engineering soil for replacement and filling is a material which has stable performance, no corrosivity, certain hardness and good gradation and does not contain plant residues, garbage and other impurities.
And carrying out layered backfill compaction on the engineering soil layer 2 by the reinforced earth stone replacement and filling foundation of the soft soil foundation, wherein the layer thickness is not more than 0.5m, and the compaction coefficient is not less than 0.91.
The graded crushed stone layer 3 is made of materials with stable performance and no erosion, and is clean, tidy and well graded.
The backfill operation control layer thickness of the reinforced earth and stone replacement and filling foundation of the soft soil foundation to the graded crushed stone layer 3 is not more than 0.5m, and the compaction coefficient is not less than 0.91.
The thickness of the cushion layer 4 is 10cm, the strength grade is C10, and the longitudinal and transverse dimensions of the cushion layer should exceed the longitudinal and transverse dimensions of the bottom plate by 10 cm.
If the wall bottom plate 8 and the wall body 9 are made of masonry structures, the cushion layer 4 does not need to be built; in the case of a reinforced concrete structure, the cushion 4 must be constructed. The structural dimensions of the wall plate 8 and the wall 9 can be determined by structural calculations.
The replacement and filling thickness H is determined according to the factors such as the soil condition of the foundation, the structure type, the load size and the like by calculation according to a formula, but the maximum depth is not more than 3.0 m.
For verifying the feasibility of the utility model soft soil foundation reinforced earth stone replacement filling foundation, the retaining wall test section with the length of 100m is built earlier. And data collection of various technical indexes such as foundation settlement, deformation observation, foundation bearing capacity test and the like is well carried out in the construction process of the test section, and the method is used for the replacement and filling treatment of all retaining wall foundations after the test proves that the scheme is feasible.
In conclusion, the geogrid 1, the engineering soil layer 2 and the graded broken stone layer 3 are reasonably utilized to integrate loose engineering soil through the tensile strength and the shear strength of the geogrid 1, the bearing capacity of the foundation is enhanced through the compression resistance and the reverse filtration of the graded broken stones 3, underground water is easily drained, the effect of improving the stability of the whole foundation is achieved through the structure deep underground leveling and compaction, the normal construction of the retaining wall or the hydraulic structure on soft soil is guaranteed, and the idea of conveniently planning the construction of the retaining wall or the building of the bad section is achieved.
Moreover, the geogrid 1, the engineering soil layer 2 and the graded gravel layer 3 are arranged, so that the effect of dredging without excavation is achieved by mutual compaction of engineering soil and mucky soil, the effects of diffusing stress, adjusting uneven settlement and increasing the bearing capacity and stability of a foundation are further achieved, the proper replacement and filling thickness and the treatment range are adjusted according to the soil quality of different places, and the effect of facilitating foundation support of a retaining wall or a building is achieved.
Claims (7)
1. The utility model provides a soft soil foundation reinforced earth stone trades fills foundation structure, includes geogrid (1), its characterized in that: geogrid (1) inside package has engineering soil layer (2), engineering soil layer (2) top is provided with level and joins in marriage metalling (3), be provided with retaining wall (10) on level and join in marriage metalling (3), retaining wall (10) are including wall bottom plate (8) that are located retaining wall (10) bottom and wall (9) that are located wall bottom plate (8) upper portion, geogrid (1), engineering soil layer (2) and level and join in marriage metalling (3) both sides and are the basic sideline (5) of filling out, the basic sideline of filling out (5) and excavation sideline (6) are the setting of inverted triangle-shaped.
2. A soft soil foundation reinforced earth stone replacement foundation structure according to claim 1, characterized in that: and a cushion layer (4) is also arranged between the graded crushed stone layer (3) and the wall bottom plate (8).
3. A soft soil foundation reinforced earth stone replacement foundation structure according to claim 1, characterized in that: the slope ratio of the foundation replacement sideline (5) to the excavation sideline (6) is 1: 1.5.
4. A soft soil foundation reinforced earth stone replacement foundation structure according to claim 1, characterized in that: and the space between the foundation replacement and filling sideline (5) and the excavation sideline (6) is backfilled by original excavation soil or replacement and filling materials.
5. A soft soil foundation reinforced earth stone replacement foundation structure according to claim 1, characterized in that: and the foundation replacement and filling side line (5) is an outer side line of the reinforced earth stone replacement and filling foundation of the soft soil foundation.
6. A soft foundation reinforced earth and stone replacement foundation structure as claimed in any one of claims 1 to 5, wherein: the type of the geogrid (1) is TGGS40-40 type bidirectional geogrid.
7. A soft foundation reinforced earth and stone replacement foundation structure as claimed in any one of claims 1 to 5, wherein: the geogrid (1) is a single layer or two or more layers; the engineering soil layers (2) are single layers or two or more layers, and the thickness of the engineering soil layer (2) wrapped between every two layers of geogrids (1) is not more than 0.5 m.
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| CN202021134864.XU CN212896290U (en) | 2020-06-18 | 2020-06-18 | Reinforced earth stone replacement and filling foundation structure of soft soil foundation |
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| CN202021134864.XU CN212896290U (en) | 2020-06-18 | 2020-06-18 | Reinforced earth stone replacement and filling foundation structure of soft soil foundation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114892554A (en) * | 2022-06-21 | 2022-08-12 | 湖北工业大学 | Pavement structure of road culvert |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114892554A (en) * | 2022-06-21 | 2022-08-12 | 湖北工业大学 | Pavement structure of road culvert |
| CN114892554B (en) * | 2022-06-21 | 2023-10-03 | 湖北工业大学 | Pavement structure of road culvert |
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Address after: 300202 Floor 13, Building 1, Jundu Building, No. 16, Dongting Road, Hexi District, Tianjin Patentee after: Hebei water resources and Hydropower Survey, design and Research Institute Group Co.,Ltd. Address before: 050000 No.1 Zhongying street, Zhongshan West Road, Qiaoxi District, Shijiazhuang City, Hebei Province Patentee before: HEBEI Research Institute OF INVESTIGATION & DESIGN OF WATER CONSERVANCY & HYDROPOWER |