Enhancement treatment system for salinized soil foundation
By using cement fly ash gravel piles and a reverse filter hydrophobic composite structure in saline soil foundations, the rise of groundwater is prevented, the problem of easy corrosion of CFG pile structures in saline soil environments is solved, and the bearing capacity of the foundation and the stability of the structure are improved.
Patent Information
- Application Number
- CN202520555351.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-27
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2035-03-27
AI Technical Summary
Saline soils are characterized by salt swelling and collapsibility, resulting in low foundation bearing capacity and easy deformation. Existing CFG pile structures are prone to corrosion and failure in saline soil environments, affecting building safety.
The system employs a cement-fly ash-gravel pile combined with a reverse filter and hydrophobic composite structure, including a protective hydrophobic transition layer, a waterproof reverse filter isolation layer, and a salt-removing and hydrophobic structural layer, to prevent groundwater from rising into the reverse filter and hydrophobic composite structure and to prevent secondary salinization.
It effectively reduces or even eliminates secondary salinization, improves foundation bearing capacity and structural stability, extends service life, and reduces construction difficulty and cost.
Smart Images
Figure CN223951747U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a kind of reinforcing treatment systems, in particular to a kind of reinforcing treatment systems for saline soil foundation, belong to foundation treatment engineering structure design construction technical field. BACKGROUND
[0002] Saline soil is widely distributed in arid and semi-arid regions of China, with the new energy engineering construction gradually advancing to the Gobi, the situation of facing saline soil foundation environment is more and more widespread. Saline soil foundation is low in bearing capacity and easy to deform due to its salt expansion and dissolution. CFG pile can be used to treat and reinforce the foundation. However, saline soil itself has high salt content, which can diffuse to the CFG cushion layer part along with the capillary water after dissolution, resulting in the failure of the connection between CFG pile and upper building foundation due to erosion, and the upper building may have large uneven settlement, even collapse, which will have a great impact on regional economy and people's life and property safety.
[0003] Yuan Hailiang et al. proposed a connection structure of CFG pile composite cushion and composite foundation, a support plate is provided on the end of the CFG pile in the cushion, a connecting rod is slidably arranged in the support plate, and a mounting seat is fixedly connected to the support plate. This structure can effectively improve the connection performance of the cushion, but the structure is complex and the applicability in saline soil environment is not considered. The connection device in the soil body is easy to fail under the corrosion of foundation soil, resulting in the loss of connection performance of the whole structure.
[0004] In the prior art, most of the CFG pile cushion researches are for general weak foundation, without considering the influence of saline soil foundation characteristics on the cushion structure. INVENTION CONTENTS
[0005] The technical problem to be solved by the utility model is to provide a reinforcing treatment system for saline soil foundation that can effectively reduce or even eliminate secondary salinization.
[0006] The technical scheme adopted to solve the above technical problem is: a reinforcing treatment system for saline soil foundation, comprising cement fly ash gravel piles, each cement fly ash gravel pile is uniformly inserted into the saline soil foundation, the reinforcing treatment system further comprises a filter drainage composite structure, the filter drainage composite structure is laid on the saline soil foundation, and the top of each cement fly ash gravel pile is supported on the bottom surface of the filter drainage composite structure.
[0007] Further, the enhanced treatment system further comprises a protective hydrophobic transition layer, the protective hydrophobic transition layer is laid between the saline soil foundation and the anti-filtration hydrophobic composite structure, and the top of each cement fly ash gravel pile is embedded in the protective hydrophobic transition layer from below.
[0008] Preferably, the protective hydrophobic transition layer comprises at least a bottom graded sand and gravel sublayer in the thickness direction, and the top of each cement fly ash gravel pile is embedded in the bottom graded sand and gravel sublayer from below.
[0009] Further, the anti-filtration hydrophobic composite structure comprises at least a waterproof anti-filtration isolation layer and a salt-removing hydrophobic structure layer, the waterproof anti-filtration isolation layer is laid on the protective hydrophobic transition layer, and the salt-removing hydrophobic structure layer is laid on the waterproof anti-filtration isolation layer; the salt-containing water in the saline soil foundation is prevented from entering the salt-removing hydrophobic structure layer by the waterproof anti-filtration isolation layer.
[0010] Preferably, the waterproof anti-filtration isolation layer comprises a corrosion-resistant water-permeable protective sublayer and a high-strength waterproof anti-filtration sublayer, and the corrosion-resistant water-permeable protective sublayer is attached to at least the lower side of the high-strength waterproof anti-filtration sublayer, and the salt-containing water in the saline soil foundation is prevented from entering the salt-removing hydrophobic structure layer by the high-strength waterproof anti-filtration sublayer.
[0011] Further, the corrosion-resistant water-permeable protective sublayer is a bottom geofiber layer made of a water-permeable geosynthetic material formed by needling or weaving synthetic fibers, the high-strength waterproof anti-filtration sublayer is a composite geomembrane layer made of a geomembrane formed by combining a plastic film as a anti-seepage base material with a non-woven fabric, and an upper geofiber layer is further attached to the upper side of the composite geomembrane layer.
[0012] Preferably, the salt-removing hydrophobic structure layer comprises a bone stone support structure sublayer and a sand soil permeation structure sublayer, the bone stone support structure sublayer is arranged on the upper geofiber layer, and the sand soil permeation structure sublayer is arranged on the bone stone support structure sublayer.
[0013] Further, the bone stone support structure sublayer comprises a pebble hydrophobic structure and a gravel water-permeable structure, and the pebble hydrophobic structure and the gravel water-permeable structure are sequentially arranged on the upper geofiber layer from bottom to top.
[0014] Preferably, the sand soil permeation structure sublayer is a top geofiber layer made of a water-permeable geosynthetic material formed by needling or weaving synthetic fibers, and the top geofiber layer is arranged on the gravel water-permeable structure.
[0015] Further, a top graded sand and gravel sublayer is further laid on the top geofiber layer.
[0016] The utility model discloses beneficial effect is: the technical scheme provided by the present application is based on the existing cement fly ash broken stone pile, and then the arrangement characteristics that all the cement fly ash broken stone piles are evenly inserted in the saline soil foundation are combined, the reinforcing treatment system of the application is formed by increasing the setting reverse filtration hydrophobic composite structure, and the reverse filtration hydrophobic composite structure is laid on the saline soil foundation, then the top of all the cement fly ash broken stone piles is supported on the bottom surface of the reverse filtration hydrophobic composite structure, then in the engineering operation process, the underground water in the saline soil foundation is prevented from rising to the reverse filtration hydrophobic composite structure by the reverse filtration hydrophobic composite structure. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1 It is cross section structure schematic diagram for the reinforcing treatment system of the utility model for saline soil foundation.
[0018] Marked as in drawing: cement fly ash broken stone pile 1, saline soil foundation 2, protective hydrophobic transition layer 3, corrosion-resistant water-permeable protective sublayer 4, high-strength waterproof reverse filtration sublayer 5, upper geotextile layer 6, sand soil penetration structure sublayer 7, pebble hydrophobic structure 8, broken stone water-permeable structure 9, top graded sand and gravel sublayer 10. DETAILED DESCRIPTION
[0019] TERMS EXPLANATION
[0020] Secondary salinization: the underground water rises to the surface vicinity through capillary action and evaporates, and the salt contained in the lower saline soil rises with the capillary water and accumulates in the surface layer, and after evaporation and crystallization, secondary salinization is formed.
[0021] Geotextile: it is a water-permeable geosynthetic material made of synthetic fibers by needling or weaving, which still has the material characteristics of high strength and corrosion resistance in dry and wet alternating environment.
[0022] Composite geomembrane: a geotechnical impermeable material made of plastic film as impermeable base material and non-woven fabric. The non-woven fabric is formed by needling or heat bonding, and has high tensile strength and elongation. After combining with plastic film, the tensile strength and puncture resistance of plastic film are increased, and it has good water repellency and good corrosion resistance to chemical action.
[0023] For example, Figure 1The utility model provides a kind of for the secondary salinization of effectively reducing even eliminating the enhancement treatment system of saline soil foundation shown can.The enhancement treatment system includes cement fly ash macadam pile 1, all cement fly ash macadam pile 1 is evenly inserted in saline soil foundation 2, the enhancement treatment system further includes anti-filtering water-repellent composite structure, anti-filtering water-repellent composite structure is covered on saline soil foundation 2, and the top of all cement fly ash macadam pile 1 is supported on the bottom surface of anti-filtering water-repellent composite structure;During engineering operation, groundwater in saline soil foundation 2 is prevented from rising into the anti-filtering water-repellent composite structure by anti-filtering water-repellent composite structure.The technical scheme provided in the application is based on existing cement fly ash macadam pile, combined with the arrangement features that all cement fly ash macadam pile is evenly inserted in saline soil foundation, the enhancement treatment system of the application is constructed by increasing anti-filtering water-repellent composite structure, and the anti-filtering water-repellent composite structure is covered on saline soil foundation, then the top of all cement fly ash macadam pile is supported on the bottom surface of anti-filtering water-repellent composite structure;Then during engineering operation, groundwater in saline soil foundation is prevented from rising into the anti-filtering water-repellent composite structure by anti-filtering water-repellent composite structure.After the above structure of the application is used, since groundwater in saline soil foundation cannot enter the anti-filtering water-repellent composite structure, capillary water in the lower part of foundation will not crystallize due to evaporation, which in turn causes secondary salinization of anti-filtering water-repellent composite structure, thereby reducing the bearing capacity and load transfer performance of anti-filtering water-repellent composite structure as a cushion layer, achieving the purpose of effectively reducing or even eliminating secondary salinization of anti-filtering water-repellent composite structure as a cushion layer.Combined with the condition of foundation itself, in order to prolong the service life of anti-filtering water-repellent composite structure, the enhancement treatment system described in the application further includes protective water-repellent transition layer 3, protective water-repellent transition layer 3 is laid between saline soil foundation 2 and anti-filtering water-repellent composite structure, and the top of all cement fly ash macadam pile 1 is embedded in protective water-repellent transition layer 3 from below.The preferred structure is that protective water-repellent transition layer 3 includes at least bottom graded sand and gravel sublayer along the thickness direction, and the top of all cement fly ash macadam pile 1 is embedded in bottom graded sand and gravel sublayer from below.
[0024] Correspondingly, in combination with the prior art, in order to simplify the structure of the reverse filtration and water repellent composite structure of the present application, facilitate construction, and at the same time, as much as possible, reduce or even eliminate secondary salinization, the reverse filtration and water repellent composite structure of the present application at least includes a waterproof reverse filtration isolation layer and a salt discharge and water repellent structure layer, the waterproof reverse filtration isolation layer is laid on the protective water repellent transition layer 3, and the salt discharge and water repellent structure layer is laid on the waterproof reverse filtration isolation layer; the salt-containing water in the saline soil foundation 2 is prevented from entering the salt discharge and water repellent structure layer by the waterproof reverse filtration isolation layer. At this time, the waterproof reverse filtration isolation layer includes a corrosion-resistant water-permeable protective sublayer 4 and a high-strength waterproof reverse filtration sublayer 5, and the corrosion-resistant water-permeable protective sublayer 4 is attached to at least the lower side of the high-strength waterproof reverse filtration sublayer 5, and the salt-containing water in the saline soil foundation 2 is prevented from entering the salt discharge and water repellent structure layer by the high-strength waterproof reverse filtration sublayer 5; the salt discharge and water repellent structure layer includes a bone stone support structure sublayer and a sand soil penetration prevention structure sublayer 7, the bone stone support structure sublayer is arranged on the upper soil fiber layer, and the sand soil penetration prevention structure sublayer 7 is arranged on the bone stone support structure sublayer.
[0025] More specifically, the corrosion-resistant water-permeable protective sublayer 4 is a bottom soil fiber layer made of a water-permeable geosynthetic material formed by needle punching or weaving of synthetic fibers, the high-strength waterproof reverse filtration sublayer 5 is a composite geomembrane layer made of a geomembrane formed by compounding a plastic film as a anti-seepage base material with a non-woven fabric, and an upper soil fiber layer 6 is further attached to the upper side of the composite geomembrane layer. The bone stone support structure sublayer includes a gravel hydrophobic structure 8 and a crushed stone water-permeable structure 9; and in order to avoid fine sand in the uppermost layer structure from entering the bone stone support structure sublayer and reducing the hydrophobic function thereof, the gravel hydrophobic structure 8 and the crushed stone water-permeable structure 9 are sequentially arranged on the upper soil fiber layer 6 from bottom to top. At this time, the sand soil penetration prevention structure sublayer 7 is also a top soil fiber layer made of a water-permeable geosynthetic material formed by needle punching or weaving of synthetic fibers; the top soil fiber layer of the present application is arranged on the crushed stone water-permeable structure 9. A top graded gravel sublayer 10 is further laid on the top soil fiber layer.
[0026] In summary, the above technical solutions provided by the present application also have the following advantages,
[0027] 1. The present application provides a CFG pile composite foundation cushion layer structure in a saline soil environment, which has small construction difficulty, low cost, and strong corrosion resistance, and has strong feasibility;
[0028] 2. The present application provides a CFG pile composite foundation cushion layer multi-layer structure using multiple layers of soil fiber and composite geomembrane as a water barrier and gravel as a hydrophobic layer, which can well adapt to the saline soil environment, effectively prevent the invasion of capillary water, and thereby avoid the problem of failure of the cushion layer due to secondary salinization;
[0029] 3. It is easy to construct, highly feasible, and economical, and can provide reference and guidance for foundation treatment in saline soil areas.
[0030] The technical solution of this application will be further described below through specific embodiments:
[0031] Example 1
[0032] The technical solution provided in this application is a novel CFG pile composite foundation cushion layer structure combining geofibers and composite geomembranes. Its working mechanism utilizes the strong tear resistance and excellent corrosion resistance of geofibers to create a hydrophobic layer in the middle of the cushion layer. This hydrophobic layer, from top to bottom, consists of graded gravel, geofibers, and crushed / pebble gravel. The first cushion layer at the top of the CFG pile is graded gravel, ensuring a tight connection with the pile body; the second cushion layer is a double layer of geofibers with a composite geomembrane sandwiched within, this multi-layered composite structure serving as the primary waterproof layer at the bottom of the cushion layer; the third cushion layer consists of a pebble layer and a crushed stone layer, serving as the main load-bearing and hydrophobic layer; the fourth cushion layer is composed of geofibers, utilizing their strong tear resistance to prevent the infiltration of the upper graded gravel layer and damage to the hydrophobic capacity of the crushed / pebble layer; the fourth cushion layer, composed of graded gravel, bears the force transmitted from the superstructure and distributes it evenly.
[0033] The application of this method combines graded gravel with geotextile fibers to prevent the infiltration of the upper backfill soil into the crushed and gravel layer, thus avoiding any impact on drainage. The large gaps in the arrangement of the crushed and gravel effectively prevent capillary water from carrying salt upwards and causing crystallization. This novel CFG pile composite foundation cushion layer structure effectively prevents secondary salinization of the structure itself, while also preventing capillary water from carrying salt upwards, further enhancing the durability of the foundation structure.
[0034] The key point of the technical solution provided in this application is that...
[0035] 1) A CFG pile composite foundation cushion layer structure for saline soil environment is proposed, which is easy to construct, economical, and highly corrosion resistant;
[0036] 2) A multi-layered CFG pile composite foundation mattress layer structure is proposed, which uses multi-layered geofibers and composite geomembranes as waterproof layers and crushed pebbles as hydrophobic layers.
Claims
1. A system for the reinforcement treatment of a saline soil foundation, comprising cement fly ash gravel piles (1), each of which is inserted uniformly in a saline soil foundation (2), characterized in that: The reinforcing treatment system further comprises a reverse filtration and water repellent composite structure, which is laid on the saline soil foundation (2), and the top of each cement fly ash gravel pile (1) is supported on the bottom surface of the reverse filtration and water repellent composite structure; during the operation of the project, the underground water in the saline soil foundation (2) is prevented from rising into the reverse filtration and water repellent composite structure through the reverse filtration and water repellent composite structure.
2. The system for enhanced treatment of a salt-affected ground according to claim 1, wherein: The reinforcing treatment system further comprises a protective water repellent transition layer (3), which is laid between the saline soil foundation (2) and the reverse filtration and water repellent composite structure, and the top of each cement fly ash gravel pile (1) is embedded in the protective water repellent transition layer (3) from below.
3. The system for enhanced treatment of a salt-affected ground according to claim 2, wherein: The protective water repellent transition layer (3) comprises at least a bottom graded sand and gravel sublayer, and the top of each cement fly ash gravel pile (1) is embedded in the bottom graded sand and gravel sublayer from below.
4. The system for the reinforcement treatment of a foundation of a salty ground according to claim 2 or 3, characterized in that: The reverse filtration and water repellent composite structure comprises at least a waterproof reverse filtration isolation layer and a salt discharge and water repellent structure layer, the waterproof reverse filtration isolation layer is laid on the protective water repellent transition layer (3), and the salt discharge and water repellent structure layer is laid on the waterproof reverse filtration isolation layer; the salt-containing water in the saline soil foundation (2) is prevented from entering the salt discharge and water repellent structure layer through the waterproof reverse filtration isolation layer.
5. The system for enhanced treatment of a salt-affected ground according to claim 4, wherein: The waterproof reverse filtration isolation layer comprises a corrosion-resistant and water-permeable protective sublayer (4) and a high-strength waterproof reverse filtration sublayer (5), the corrosion-resistant and water-permeable protective sublayer (4) is attached to at least the lower side of the high-strength waterproof reverse filtration sublayer (5), and the salt-containing water in the saline soil foundation (2) is prevented from entering the salt discharge and water repellent structure layer through the high-strength waterproof reverse filtration sublayer (5).
6. The system for enhanced treatment of a salt-affected ground according to claim 5, wherein: The corrosion-resistant and water-permeable protective sublayer (4) is a bottom geotextile layer made of a water-permeable geosynthetic material formed by needling or weaving synthetic fibers, the high-strength waterproof reverse filtration sublayer (5) is a composite geomembrane layer made of a geomembrane formed by combining a plastic film as a anti-seepage base material with a non-woven fabric, and an upper geotextile layer (6) is further attached to the upper side of the composite geomembrane layer.
7. The system for enhanced treatment of a salt-affected ground according to claim 6, wherein: The salt discharge and water repellent structure layer comprises a bone stone support structure sublayer and a sand soil permeation structure sublayer (7), the bone stone support structure sublayer is arranged on the upper geotextile layer, and the sand soil permeation structure sublayer (7) is arranged on the bone stone support structure sublayer.
8. The system for enhanced treatment of a salt-affected ground according to claim 7, wherein: The bone stone support structure sublayer comprises a pebble water repellent structure (8) and a gravel water permeable structure (9), which are sequentially arranged on the upper geotextile layer (6) from bottom to top.
9. The system for enhanced treatment of a salt-affected ground according to claim 8, wherein: The sand soil permeation structure sublayer (7) is a top geotextile layer made of a water-permeable geosynthetic material formed by needling or weaving synthetic fibers, and the top geotextile layer is arranged on the gravel water permeable structure (9).
10. The system for enhanced treatment of a salt-affected ground according to claim 9, wherein: A top graded sand and gravel sublayer (10) is further laid on the top geotextile layer.