CN115287954B - Roadbed in coastal reclamation area and treatment construction method - Google Patents
Roadbed in coastal reclamation area and treatment construction method Download PDFInfo
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- CN115287954B CN115287954B CN202210954113.XA CN202210954113A CN115287954B CN 115287954 B CN115287954 B CN 115287954B CN 202210954113 A CN202210954113 A CN 202210954113A CN 115287954 B CN115287954 B CN 115287954B
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- 238000010276 construction Methods 0.000 title claims abstract description 49
- 239000004575 stone Substances 0.000 claims abstract description 138
- 239000004568 cement Substances 0.000 claims abstract description 127
- 238000003756 stirring Methods 0.000 claims abstract description 71
- 239000004576 sand Substances 0.000 claims abstract description 61
- 239000002689 soil Substances 0.000 claims abstract description 60
- 239000002131 composite material Substances 0.000 claims abstract description 17
- 238000011049 filling Methods 0.000 claims abstract description 13
- 239000004927 clay Substances 0.000 claims abstract description 10
- 238000002156 mixing Methods 0.000 claims description 43
- 238000012544 monitoring process Methods 0.000 claims description 28
- 238000000034 method Methods 0.000 claims description 25
- 238000005096 rolling process Methods 0.000 claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 20
- 238000004537 pulping Methods 0.000 claims description 16
- 230000008569 process Effects 0.000 claims description 13
- 230000003068 static effect Effects 0.000 claims description 13
- 238000003825 pressing Methods 0.000 claims description 9
- 239000002002 slurry Substances 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 6
- 239000000945 filler Substances 0.000 claims description 4
- 238000005429 filling process Methods 0.000 claims description 4
- 238000004062 sedimentation Methods 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 4
- 238000003860 storage Methods 0.000 claims description 4
- 230000002457 bidirectional effect Effects 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000013461 design Methods 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 238000004080 punching Methods 0.000 claims description 3
- 238000012797 qualification Methods 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 4
- 230000007704 transition Effects 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 241000537371 Fraxinus caroliniana Species 0.000 description 1
- 235000010891 Ptelea trifoliata Nutrition 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/04—Foundations produced by soil stabilisation
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Architecture (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- General Engineering & Computer Science (AREA)
- Road Paving Structures (AREA)
Abstract
The invention discloses a roadbed in a coastal hydraulic reclamation area, which sequentially comprises a cement stirring pile layer, a small stone cushion layer, a sand and gravel cushion layer and a backfill soil roadbed layer from bottom to top, wherein the cement stirring pile layer consists of a plurality of cement stirring piles which are vertical to the ground, the lower ends of the cement stirring piles extend into a powdery clay layer in the hydraulic reclamation area, the upper ends of the cement stirring piles are positioned at the junction of a silt layer in the hydraulic reclamation area and a prime filling layer in the hydraulic reclamation area, the small stone cushion layer and soft soil among piles in the cement stirring pile layer form a composite foundation together, the sand and gravel cushion layer is paved above the small stone cushion layer, and the backfill soil roadbed layer is paved above the sand and gravel cushion layer; the invention further comprises a construction method of the roadbed of the coastal hydraulic reclamation area. The invention can solve the technical problems of poor structural reliability and easy rebound existing in the conventional roadbed of the coastal hydraulic reclamation area.
Description
Technical Field
The invention relates to the technical field of coastal reclamation area roadbeds, in particular to a coastal reclamation area roadbed. In addition, the invention also relates to a treatment construction method of the roadbed of the coastal reclamation area.
Background
With the continuous deep construction of coastal cities, land resources become a big bottleneck for restricting the development of the land resources. Under the condition of shortage of land resources and high land-marking cost, urban construction and road construction are carried out by utilizing the land which is filled up by coastal beach. The coastal beach is mainly the sea phase sedimentary soil formed by silt and mucky soil, and the dredger fill is in a flowing plastic state, has the characteristics of high water content, large pore ratio, low permeability and low strength, and cannot be directly used by engineering. In view of the rapid development of coastal cities, the rapid development of the coastal cities needs the land, the new dredger fill has insufficient airing time, the carrying capacity is extremely low, the later stage is treated by a soft foundation, but the water content is high, the foundation is soft, and the roadbed is easy to generate uneven settlement, so that the quality hidden trouble is caused.
At present, aiming at the common practice of the roadbed in the coastal hydraulic reclamation area, the sludge is excavated or the drainage/waterproof structure is arranged, the operations such as vacuum preloading, preloading and vacuum preloading are needed to be carried out in the prior art, the prepressing materials are needed to be purchased externally, the prepressing materials are needed to be transferred to the appointed place for piling after the prepressing is completed, the economic cost is high, the roadbed foundation consolidation time is long, the roadbed is easy to rebound and easy to slip after bearing, and the reliability is further needed to be improved.
Disclosure of Invention
The invention provides a coastal hydraulic reclamation area roadbed and a processing construction method, which are used for solving the technical problems that the existing coastal hydraulic reclamation area roadbed structure is poor in reliability and easy to rebound.
According to one aspect of the invention, a roadbed for a coastal reclamation area is provided, which sequentially comprises a cement stirring pile layer, a small stone cushion layer, a sand and gravel cushion layer and a backfill roadbed layer from bottom to top, wherein the cement stirring pile layer consists of a plurality of cement stirring piles which are perpendicular to the ground, the lower ends of the cement stirring piles extend into a powdery clay layer of the reclamation area, the upper ends of the cement stirring piles are positioned at the junction of the clay layer of the reclamation area and a prime soil layer of the reclamation area, the small stone cushion layer and soft soil among piles in the cement stirring pile layer form a composite foundation together, the sand and gravel cushion layer is paved above the small stone cushion layer, and the backfill roadbed layer is paved above the sand and gravel cushion layer.
As a further improvement of the above technical scheme: the cement stirring piles in the cement stirring pile layer are arranged in a rectangular shape or a quincuncial shape, the diameter of each cement stirring pile is 50-80 cm, and the distance between the piles is 0.9-1.3 m.
Further, the small stones in the small stone cushion layer are unscreened small stones, and the maximum diameter of the small stones is not more than 15cm.
Further, the volume ratio between the sand and the broken stone in the sand broken stone cushion layer is 3:10 to 5:7.
Further, geogrid layers are paved between the small stone cushion layer and the sand gravel cushion layer and between the sand gravel cushion layer and the backfill soil roadbed layer.
According to another aspect of the invention, there is also provided a method for treating and constructing a roadbed of a coastal reclamation area, comprising the steps of:
s1, construction of a cement stirring pile layer: determining the pile hole position of the cement mixing pile, firstly using punching equipment to open pile holes with the aperture and the hole depth meeting the requirements, and then pouring cement slurry into the pile holes to manufacture the cement mixing pile with the height meeting the requirements;
s2, paving a small stone cushion layer: after the strength of the cement stirring pile in the cement stirring pile layer meets the requirement, excavating to the pile top of the cement stirring pile, paving an unscreened small stone cushion layer on the cement stirring pile layer, and enabling the small stone cushion layer to be mutually meshed with soft soil among piles in the cement stirring pile layer to form a composite foundation;
s3, paving a sand and gravel cushion layer: leveling the upper surface of the small stone cushion layer, and paving a sand and gravel cushion layer above the small stone cushion layer;
s4, paving a backfill road base layer: and (3) after the sand and gravel cushion layer is rolled and leveled, paving a backfill road base layer above the sand and gravel cushion layer to form a basic roadbed structure.
As a further improvement of the above technical scheme:
In the step S1, an intelligent digital monitoring system is adopted to detect the construction process of the cement mixing pile, and the method specifically comprises the following steps:
S101, arranging a foreground intelligent piling module, a background standard pulping module and a data cloud monitoring platform, wherein the foreground intelligent piling module comprises a depth sensor, a current transformer, an inclination angle sensor and a flow sensor, and the background standard pulping module comprises a weighing sensor and a pulping recording host;
s102, monitoring the slurry dosage of a foreground Shi Dashui, performing speed monitoring, depth monitoring, gradient monitoring and current monitoring, and collecting data in real time and transmitting the data to a data cloud monitoring platform;
And S103, storing data by using a data cloud monitoring platform in the construction process of the cement mixing pile, supervising and managing personnel checking the data in real time by using a PC end and a mobile phone end, and knowing the construction condition and supervising.
Further, in step S102, the background pulping module controls the cement and water usage according to the cement-cement ratio of 0.4-0.6, the background pulping module controls the cement usage by the weight under the cement storage tank, controls the water consumption by the flowmeter, inputs the water into the stirrer for fully stirring, and then puts the water into the mud pit for slow stirring and then conveys the water to the foreground;
In the step S103, the cement mixing pile is constructed by adopting a construction process of two-axis bidirectional, two-spraying and two-stirring, stirring is performed to a supporting layer according to the design requirement, the current abrupt change exceeds 36A as a judging qualification standard, the cement paste dosage, the drill sinking and the lifting construction rate are controlled according to pile testing parameters, the construction rate is controlled to be 0.8-1.2 m/min, the cement paste dosage is controlled through a flow sensor, the cement paste and soft soil are fully stirred, and the pile forming quality of the cement mixing pile is ensured.
Further, in the step S2, the specific operation steps of laying the small stone cushion layer are as follows:
S201, edge line measurement lofting: before the small stones are paved, the site cleaning and the sideline measuring and lofting operation can be carried out when the strength of the cement mixing pile reaches more than 2.0 MPa;
S202, filling small stones: filling process of the unscreened small stones is carried out along the longitudinal sections of the road, the small stones are gradually filled forward from one end to the other end, and the excavator is matched with a bulldozer for leveling;
S203, grinding the small stones: and rolling the filled small stones, wherein a single steel wheel road roller is adopted in the rolling process, static pressure is firstly carried out for 2-5 times, small stone fillers are stabilized, then low vibration rolling is carried out for 2-4 times, the sedimentation difference of adjacent tracks is controlled to be not more than 5mm, static pressure is finally carried out for 1-3 times, and surface tracks are eliminated.
Further, in the step S3, before the sand-gravel cushion layer is laid, a layer of geogrid is laid above the small stone cushion layer, then the sand-gravel cushion layer is laid, and after the sand-gravel cushion layer is laid, a layer of geogrid is laid on the sand-gravel cushion layer;
in the laying process of the sand and gravel cushion, a mode of filling along the line in a segmented way is adopted, the sand and gravel dumper is arranged at intervals according to the laying area of each dumper, and a bulldozer rough leveling machine and a land leveler are adopted to level according to the transverse slope;
The rolling process of the sand and gravel cushion adopts a single steel wheel road roller to roll, and initial pressing is carried out firstly: static pressure is carried out for 1 to 3 times, coarse aggregate and fine aggregate are stabilized, and then re-pressing is carried out: firstly, low vibration rolling for 1-3 times, then, high vibration rolling for 2-5 times, and finally, final pressing: static pressure is carried out for 1 to 3 times for collecting the surface.
The invention has the following beneficial effects:
(1) According to the roadbed in the coastal hydraulic reclamation area, aiming at the situation that the soft soil foundation in the coastal hydraulic reclamation area has poor bearing capacity and the soil between the piles of the cement stirring piles is rebounded, the small stone cushion layers are mutually meshed to form a whole, so that the cement stirring piles, the soil between the piles and the small stone cushion layers of the bearing layer below the roadbed are stressed together, the overall strength of the bearing layer of the roadbed is improved, and the stability and bearing capacity of the roadbed are improved; the uniformity of the bearing layer under the roadbed is improved through the transition of the paving sand and broken stone cushion layer; the thickness of the small-piece stone cushion layer can be reduced (the thicknesses of the small-piece stone cushion layer and the sand-stone cushion layer are only equal to the thickness of the conventional common sand-stone cushion layer), and the single-price broken stone of the small-piece stone is low, the small-piece stone is mutually embedded and meshed to form a whole, so that the bearing capacity is higher than that of the sand-stone cushion layer, the effect of saving the engineering cost and improving the bearing capacity of a special roadbed is achieved, the quality of the roadbed is effectively ensured, and the comfort and the safe operation of the road are ensured; the combined structure of the cement stirring pile layer, the small stone cushion layer and the sand and gravel cushion layer is adopted to form a roadbed with a pile-cushion composite structure, so that roadbed load is transmitted to a lower lying soil layer through the pile-cushion composite structure, the structure of downward force transmission of the whole upper load is increased, a simple and effective treatment method is provided for construction of a blow-fill soil foundation, the bearing capacity of blow-fill soft soil among piles can be greatly improved, the requirement of the bearing capacity of the foundation is met, the construction cost is saved, meanwhile, the energy consumption of secondary broken stone into broken stone (broken stone is used for consuming energy without processing), the bearing capacity of a roadbed lower bearing layer is effectively ensured, the stability of the roadbed in the geology of a coastal blow-fill area is ensured, and the technical problems of low bearing capacity of the foundation and rebound of the roadbed are thoroughly solved;
(2) The method for constructing the roadbed in the coastal reclamation area aims at the situation that the bearing capacity of the soft soil foundation in the coastal reclamation area is poor, the combined structure of the cement mixing pile layer, the small stone cushion layer and the sand stone cushion layer is adopted, and the construction mode combining the intelligent construction mode and the traditional construction mode is adopted, so that the construction effect is better, the bearing capacity of the reclamation soft soil among the piles can be greatly improved, the construction cost is saved, the energy consumption of secondary broken stone into broken stone is reduced, and the bearing capacity of the bearing layer under the roadbed is effectively ensured.
In addition to the objects, features and advantages described above, the present invention has other objects, features and advantages. The present invention will be described in further detail with reference to the drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
Fig. 1 is a schematic view of the structure of a roadbed of a coastal reclamation area according to a preferred embodiment of the present invention.
Legend description:
1. A cement stirring pile layer; 11. cement stirring piles; 2. a small stone cushion layer; 3. a sand gravel cushion layer; 4. backfilling the soil road base layer; 5. a silty clay layer; 6. a silt layer; 7. a plain filling layer; 8. and (5) a geogrid layer.
Detailed Description
Embodiments of the invention are described in detail below with reference to the attached drawing figures, but the invention can be practiced in a number of different ways, as defined and covered below.
As shown in fig. 1, the roadbed in the coastal reclamation area of the present embodiment sequentially comprises, from bottom to top, a cement stirring pile layer 1, a small stone cushion layer 2, a sand stone cushion layer 3 and a backfill roadbed layer 4, wherein the cement stirring pile layer 1 is composed of a plurality of cement stirring piles 11 perpendicular to the ground, the lower ends of the cement stirring piles 11 extend into a powdery clay layer 5 in the reclamation area, the upper ends of the cement stirring piles 11 are positioned at the junction of a clay layer 6 in the reclamation area and a prime filler layer 7 in the reclamation area, and the following purposes are: (1) The soil filling at the upper part of the roadbed can be ensured to be larger than the thickness of 80cm of the roadbed; (2) The peripheral soil body forms counter pressure on the hydraulic reclamation foundation under the cushion layer, so that the lateral displacement of the hydraulic reclamation soil is reduced; (3) The small stone cushion layer 2 is integrated, the enlarged area is increased to be downwards conducted, and the small stone cushion layer 2 is combined with cement stirring piles 11, soil among piles and the composite foundation bearing form of the small stone cushion layer 2. The small stone cushion layer 2 and soft soil among piles in the cement stirring pile layer 1 form a composite foundation, the sand-gravel cushion layer 3 is paved above the small stone cushion layer 2, and the backfill soil roadbed layer 4 is paved above the sand-gravel cushion layer 3.
In this embodiment, the small piece stone cushion layer 2 is arranged on the hydraulic reclamation foundation, is combined with the cement stirring pile 11 and is positioned under the sand stone cushion layer 3, and the sand stone cushion layer 3 and the small piece stone cushion layer 2 are combined and positioned under the backfill soil roadbed to form a combined structure of a cement stirring pile layer, the small piece stone cushion layer and the sand stone cushion layer, so that the bearing capacity of hydraulic reclamation soft soil among piles can be greatly improved, the construction cost is saved, the energy consumption of secondary broken piece stones into broken stone is reduced, the bearing capacity of a roadbed lower bearing layer is effectively ensured, and the stability of the geological roadbed in a coastal hydraulic reclamation area is ensured.
In this embodiment, the small stone cushion layer 2 is a layer of cushion layer laid on the pile top of the silt and cement mixing pile 11, the small stone cushion layers 2 are mutually embedded and extruded into a whole, and the small stone cushion layer and the cement mixing pile 11 at the lower part and soil between piles bear upper load together. In this embodiment, if the small stone cushion layer 2 is not provided, the composite foundation formed by the cement mixing piles 11 and the soil between the piles bears the upper load, and the construction process is easy to occur because the soil between the piles has low bearing capacity and is in a flowing plastic shape, and road construction machines such as a road roller, a residue soil vehicle, a loader and the like sink into the soil between the piles, so that the construction cannot be performed. Through various method tests, a layer of small stone cushion layer 2 with good effect is paved on the cement mixing pile 11 and the soil between piles to form a composite foundation of the cement mixing pile 11, the soil between piles and the small stone cushion layer 2, the composite foundation bears upper load, and finally the cement mixing pile 11 transmits the load to a better soil layer (bearing layer) at the pile bottom of the cement mixing pile 11. The sand and gravel cushion layer 3 is used as a transition layer between the small-piece stone cushion layer 2 and the backfill soil roadbed layer 4, and has the functions of uneven settlement adjusting layer, blowing-prevention foundation, surplus water rising isolation layer and the like.
In this embodiment, the thickness of the small stone underlayment 2 is not less than 30cm, and the thickness of the sand-gravel underlayment 3 is not less than 20cm.
In this embodiment, if the small stone cushion layer 2 is not laid, the soft soil bearing capacity between the cement mixing piles 11 is insufficient, the phenomenon that the construction machinery is sunk and cannot be constructed can occur, and the phenomenon that the bearing capacity is insufficient, rebound, uneven deformation, sedimentation and the like can also occur after the roadbed is formed; if the sand and gravel cushion layer 3 is not paved, the phenomenon of cracking and uneven settlement of the roadbed can be caused by the fact that a transition layer does not exist between the small stone cushion layer 2 and the soil roadbed, and the sand and gravel cushion layer 3 has the functions of preventing the cracking and uneven settlement of the roadbed.
In this embodiment, the cement mixing piles 11 in the cement mixing pile layer 1 are rectangular, preferably square, and in other embodiments, the cement mixing piles 11 may also be quincuncial, and the above arrangement makes the pile spacing of the cement mixing piles 11 the same, each row of piles and each pile are convenient to locate, the stress is relatively balanced, the pile diameter of the cement mixing piles 11 is 50-80 cm, less than 50cm can result in too small replacement rate, the number of piles is too poor, more than 80cm can result in the failure of the existing equipment, the spraying effect cannot be guaranteed, the pile spacing is 0.9-1.3 m, the pile diameter of the cement mixing piles 11 is preferably 50cm, and the spacing is 1.1m.
In this example, the small stones in the small stone cushion layer 2 are unscreened small stones, and the maximum diameter of the small stones is not more than 15cm. Filling, rolling and mutually biting unscreened stones with the maximum size of 15cm to form integral stress, and forming a composite foundation with the cement stirring piles 11 and soft soil among the piles; particularly, after the slag soil truck is unloaded during filling, the bulldozer pushes and flattens the small stones, so that the large-particle-size stones are mutually meshed, the small particles are filled, the compactness and mutual interlocking are ensured, and the cement mixing pile is not damaged due to the overlarge particle size and is integrally formed by the small stones. Then static pressure is carried out for 3 times by using a road roller with the speed of more than 20t, and then low vibration rolling is carried out for 2 times. After the construction, the cement mixing piles 11, the soil among the piles and the small stone cushion layers 2 are integrated, the small stone cushion layers 2, the soil among the piles and the cement mixing piles 11 form a composite foundation, and compared with the composite foundation of the soil among the piles and the cement mixing piles 11, the composite foundation is provided with a layer of meshed raft cushion layers, after site construction, road rollers and the like can walk upwards without sinking, and roadbed soil cannot rebound. The upper load is transferred to the lower part, which is beneficial to improving the bearing capacity of the hydraulic filling foundation.
In this embodiment, the volume ratio between the sand and the crushed stone in the sand-crushed stone cushion layer 3 is 3:10 to 5:7, preferably, the volume ratio of the sand to the broken stone in the sand broken stone cushion layer 3 is 3:7, the sand broken stone cushion layer 3 with the ratio can effectively adjust the uneven settlement of the roadbed in the coastal reclamation area, the sand broken stone cushion layer 3 adopts middle coarse sand with the permeability coefficient larger than 5.10 < -2 > cm/s, and the broken stone adopts stone blocks with the particle size of 20-40 mm. The sand-gravel cushion layer 3 has larger water permeability, and can be used as a drainage surface of lower unsaturated soft soil according to the proportion of 3:7, so that pore water pressure at the upper part of the soft soil is easier to dissipate, and the shear strength of the soft soil is improved; the sand and gravel cushion layer 3 is paved on the small piece stone cushion layer 2, and through gradual transition of the diameter of the granules, the direct contact of the stone side and the fine particle soil foundation is buffered, so that the soil body leaking into the piece stone gaps during roadbed construction is reduced, and the stability of the roadbed is improved. In particular, the soil between piles is dredged silt, and the bearing capacity is low. The pile bottom of the cement stirring pile 11 enters a better clay layer (powdery clay layer 5) and has relatively high bearing capacity. After the two types of foundations are regulated by the small stone cushion layer 2, fine non-uniformity can be generated in the settlement of the hydraulic filling silt foundation and the cement stirring pile foundation in the roadbed filling process, and the non-uniformity settlement of the two types of foundations can be regulated by paving the 3:7 sand-gravel cushion layer 3 on the small stone cushion layer 2.
In the embodiment, a geogrid layer 8 is paved between the small piece stone cushion layer 2 and the sand gravel cushion layer 3 and between the sand gravel cushion layer 3 and the backfill soil roadbed layer 4. The geogrid lays two layers, and the first layer is laid between the small stones and the broken sand cushion layer, and the second layer is laid between the broken sand cushion layer and the backfill soil roadbed layer 4, so that the overall stress performance of the cushion layer is improved.
The method for processing and constructing the roadbed of the coastal reclamation area comprises the steps of:
S1, construction of a cement mixing pile layer 1: determining the pile hole position of the cement mixing pile 11, firstly using punching equipment to open pile holes with the aperture and the hole depth meeting the requirements, and then pouring cement slurry into the pile holes to manufacture the cement mixing pile 11 with the height meeting the requirements;
S2, paving a small stone cushion layer 2: after the strength of the cement stirring pile 11 in the cement stirring pile layer 1 meets the requirement, excavating to the pile top of the cement stirring pile 11, paving a layer of unscreened small-piece stone cushion layer 2 on the cement stirring pile layer 1, and enabling the small-piece stone cushion layer 2 to be mutually meshed with soft soil among piles in the cement stirring pile layer 1 to form a composite foundation;
s3, paving a sand and gravel cushion layer 3: leveling the upper surface of the small stone cushion layer 2, and paving a sand and gravel cushion layer 3 above the small stone cushion layer 2;
s4, paving a backfill road base layer 4: and (3) after the sand and gravel cushion layer 3 is rolled and leveled, paving a backfill road base layer 4 above the sand and gravel cushion layer 3 to form a basic roadbed structure.
In this embodiment, in step S1, an intelligent digital monitoring system is adopted to detect the construction process of the cement mixing pile, control the construction parameters of the cement mixing pile 11, ensure the cement dosage and pile length, and improve the bearing capacity of the cement mixing pile 11, and specifically includes the following steps:
s101, arranging a foreground intelligent piling module, a background standard pulping module and a data cloud monitoring platform, wherein the foreground intelligent piling module comprises a depth sensor, a current transformer, an inclination angle sensor and a flow sensor, and the background standard pulping module comprises a weighing sensor and a pulping recording host;
s102, monitoring the slurry dosage of a foreground Shi Dashui, performing speed monitoring, depth monitoring, gradient monitoring and current monitoring, and collecting data in real time and transmitting the data to a data cloud monitoring platform;
And S103, storing data by using a data cloud monitoring platform in the construction process of the cement mixing pile, supervising and managing personnel checking the data in real time by using a PC end and a mobile phone end, and knowing the construction condition and supervising.
In the embodiment, in step S102, the background pulping module controls the dosage of cement and water according to the cement-cement ratio of the pile testing parameter of 0.4-0.6, the background pulping module controls the dosage of cement by the weight below the cement storage tank, controls the water consumption by the flowmeter, inputs the water into the stirrer for fully stirring, and then puts the water into the mud pit for slow stirring and then conveys the water to the foreground;
in step S103, the cement mixing pile 11 is constructed by adopting a construction process of two-axis bidirectional, two-spraying and two-stirring, stirring is performed to a supporting layer according to the design requirement, the current abrupt change exceeds 36A as a judging qualification standard, the cement paste dosage, the drill sinking and the lifting construction rate are controlled according to the pile testing parameters, the construction rate is controlled to be 0.8-1.2 m/min, the cement paste dosage is controlled through a flow sensor, the cement paste and soft soil are fully stirred, and the pile forming quality of the cement mixing pile 11 is ensured.
In the embodiment, the coastal hydraulic reclamation area has softer geology, and the soft foundation of the roadbed is treated by adopting the cement stirring piles 11. The intelligent digital monitoring system monitors the length of a construction pile, the slurry amount, the ash amount, the current, the speed, the pile forming time, the gradient, the water-ash ratio, the perpendicularity and the pile position coordinates, uploads real-time data to a platform for storage, and supervision staff can check and retrieve construction records in real time at a PC end and a mobile phone end for checking. In particular, the standard pulping module of the background prepares pulp according to trial proportioning parameters, the foreground is constructed according to the designed pile length, the distance and the test pile size, and the current value of the current sensor suddenly changes to check whether the pile foundation enters a bearing layer (suddenly is larger than 36A), so that the integrity of the pile body and the embedding bearing layer are ensured, and the bearing capacity of the pile foundation is improved.
In this embodiment, in step S2, the specific operation steps for laying the small stone underlayment 2 are as follows:
S201, edge line measurement lofting: before the small stones are paved, the site cleaning and the sideline measuring and lofting operation can be carried out when the strength of the cement mixing pile reaches more than 2.0 MPa;
S202, filling small stones: filling process of the unscreened small stones is carried out along the longitudinal sections of the road, the small stones are gradually filled forward from one end to the other end, and the excavator is matched with a bulldozer for leveling;
S203, grinding the small stones: and rolling the filled small stones, wherein a single steel wheel road roller is adopted in the rolling process, static pressure is firstly carried out for 2-5 times, small stone fillers are stabilized, then low vibration rolling is carried out for 2-4 times, the sedimentation difference of adjacent tracks is controlled to be not more than 5mm, static pressure is finally carried out for 1-3 times, and surface tracks are eliminated.
In the embodiment, in step S3, before the sand-gravel cushion layer 3 is laid, a layer of geogrid 8 is laid above the small-piece stone cushion layer 2, then the sand-gravel cushion layer 3 is laid, after the sand-gravel cushion layer 3 is laid, a layer of geogrid 8 is laid on the sand-gravel cushion layer 3, two layers of geogrids are laid, the first layer is laid between the small-piece stone and the sand-gravel cushion layer, the second layer is laid between the sand-gravel cushion layer and the backfill soil roadbed layer 4, and the overall stress performance of the cushion layer is increased;
In the laying process of the sand-gravel cushion layer 3, a mode of filling along the line in a sectional manner is adopted, the sand-gravel dumper is arranged at intervals according to the laying area of each dumper, and a bulldozer rough leveling machine and a land leveler are adopted to level according to the transverse slope;
the rolling process of the sand and gravel cushion layer 3 adopts a single steel wheel road roller to roll, and initial pressing is carried out firstly: static pressure is carried out for 1 to 3 times, coarse aggregate and fine aggregate are stabilized, and then re-pressing is carried out: firstly, low vibration rolling for 1-3 times, then, high vibration rolling for 2-5 times, and finally, final pressing: static pressure is carried out for 1 to 3 times for collecting the surface.
The coastal reclamation area roadbed and the treatment construction method are successfully applied to the construction of two standard sections of the coastal east big road (flying An Donglu-lotus river section) of the Xiamen, and successfully solve the problem of the bearing capacity of the coastal reclamation area roadbed.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A roadbed of a coastal reclamation area is characterized by comprising a cement stirring pile layer (1), a small stone cushion layer (2), a sand stone cushion layer (3) and a backfill roadbed layer (4) from bottom to top in sequence,
The cement stirring pile layer (1) consists of a plurality of cement stirring piles (11) which are vertical to the ground, the lower ends of the cement stirring piles (11) extend into the powdery clay layer (5) of the hydraulic reclamation area, the upper ends of the cement stirring piles (11) are positioned at the junction of the silt layer (6) of the hydraulic reclamation area and the plain clay layer (7) of the hydraulic reclamation area,
The small stone cushion layer (2) and soft soil among piles in the cement stirring pile layer (1) form a composite foundation,
The sand and gravel cushion layer (3) is paved above the small stone cushion layer (2), the backfill soil road base layer (4) is paved above the sand and gravel cushion layer (3),
The small stones in the small stone cushion layer (2) are unscreened small stones, the maximum diameter of the small stones is not more than 15cm, and the small stone cushion layer (2) are mutually meshed to form a whole.
2. The seashore reclamation site subgrade according to claim 1, characterized in that,
The cement stirring piles (11) in the cement stirring pile layer (1) are arranged in a rectangular shape or a plum blossom shape, the pile diameter of the cement stirring piles (11) is 50-80 cm, and the pile spacing is 0.9-1.3 m.
3. The seashore reclamation site subgrade according to claim 1, characterized in that,
The volume ratio of the sand to the crushed stone in the sand-crushed stone cushion layer (3) is 3:10-5:7.
4. The coastal reclamation area subgrade according to claim 1 to 3, characterized in that,
Geogrid layers (8) are paved between the small stone cushion layer (2) and the sand gravel cushion layer (3) and between the sand gravel cushion layer (3) and the backfill soil road base layer (4).
5. A method for treating and constructing a roadbed in a coastal hydraulic reclamation area, which is characterized by comprising the following operation steps of:
s1, construction of a cement stirring pile layer (1): determining the pile hole position of the cement mixing pile (11), firstly using punching equipment to open pile holes with the aperture and the hole depth meeting the requirements, and then pouring cement slurry into the pile holes to manufacture the cement mixing pile (11) with the height meeting the requirements;
S2, paving a small stone cushion layer (2): after the strength of a cement stirring pile (11) in the cement stirring pile layer (1) meets the requirement, excavating to the pile top of the cement stirring pile (11), paving a layer of unscreened small-piece stone cushion layer (2) on the cement stirring pile layer (1), and enabling the small-piece stone cushion layer (2) to be mutually meshed with soft soil among piles in the cement stirring pile layer (1) to form a composite foundation;
s3, paving a sand and gravel cushion layer (3): leveling the upper surface of the small stone cushion layer (2), and paving a sand and gravel cushion layer (3) above the small stone cushion layer (2);
S4, paving a backfill road base layer (4): after the sand and gravel cushion layer (3) is rolled and leveled, a backfill road base layer (4) is paved above the sand and gravel cushion layer (3) to form a basic roadbed structure.
6. The method for treating and constructing the roadbed in the coastal reclamation area according to claim 5, wherein,
In the step S1, an intelligent digital monitoring system is adopted to detect the construction process of the cement mixing pile, and the method specifically comprises the following steps:
S101, arranging a foreground intelligent piling module, a background standard pulping module and a data cloud monitoring platform, wherein the foreground intelligent piling module comprises a depth sensor, a current transformer, an inclination angle sensor and a flow sensor, and the background standard pulping module comprises a weighing sensor and a pulping recording host;
s102, monitoring the slurry dosage of a foreground Shi Dashui, performing speed monitoring, depth monitoring, gradient monitoring and current monitoring, and collecting data in real time and transmitting the data to a data cloud monitoring platform;
And S103, storing data by using a data cloud monitoring platform in the construction process of the cement mixing pile, supervising and managing personnel checking the data in real time by using a PC end and a mobile phone end, and knowing the construction condition and supervising.
7. The method for treating and constructing the roadbed in the coastal reclamation area according to claim 6, wherein,
In the step S102, the background pulping module controls the dosage of cement and water according to the cement-cement ratio of 0.4-0.6, the background pulping module controls the dosage of cement by the weight below the cement storage tank, controls the water consumption by the flowmeter, inputs the water into the stirrer for full stirring, and then puts the water into a mud pit for slow stirring and then conveys the water to the foreground;
In the step S103, the cement mixing pile (11) is constructed by adopting a construction process of two-axis bidirectional, two-spraying and two-stirring, stirring is performed to a supporting layer according to the design requirement, the current abrupt change exceeds 36A as a judgment qualification standard, the cement paste dosage, the drill sinking and the lifting construction rate are controlled according to the pile test parameters, the construction rate is controlled to be 0.8-1.2 m/min, the cement paste dosage is controlled through a flow sensor, the cement paste and soft soil are fully stirred, and the pile forming quality of the cement mixing pile (11) is ensured.
8. The method for treating and constructing the roadbed in the coastal reclamation area according to claim 5, wherein,
In the step S2, the concrete operation steps of paving the small stone cushion layer (2) are as follows:
S201, edge line measurement lofting: before the small stones are paved, the site cleaning and the sideline measuring and lofting operation can be carried out when the strength of the cement mixing pile reaches more than 2.0 MPa;
S202, filling small stones: filling process of the unscreened small stones is carried out along the longitudinal sections of the road, the small stones are gradually filled forward from one end to the other end, and the excavator is matched with a bulldozer for leveling;
S203, grinding the small stones: and rolling the filled small stones, wherein a single steel wheel road roller is adopted in the rolling process, static pressure is firstly carried out for 2-5 times, small stone fillers are stabilized, then low vibration rolling is carried out for 2-4 times, the sedimentation difference of adjacent tracks is controlled to be not more than 5mm, static pressure is finally carried out for 1-3 times, and surface tracks are eliminated.
9. The method for treating and constructing the roadbed in the coastal reclamation area according to claim 5, wherein,
In the step S3, before the sand and gravel cushion layer (3) is paved, a layer of geogrid (8) is paved above the small stone cushion layer (2), then the sand and gravel cushion layer (3) is paved, and after the sand and gravel cushion layer (3) is paved, a layer of geogrid (8) is paved on the sand and gravel cushion layer (3);
In the laying process of the sand and gravel cushion layer (3), a mode of filling along the line in a sectional manner is adopted, the sand and gravel dumper is arranged at intervals according to the laying area of each trolley, and a bulldozer rough leveling machine and a grader are adopted to level according to a transverse slope;
The rolling process of the sand and gravel cushion layer (3) adopts a single steel wheel road roller to roll, and initial pressing is carried out firstly: static pressure is carried out for 1 to 3 times, coarse aggregate and fine aggregate are stabilized, and then re-pressing is carried out: firstly, low vibration rolling for 1-3 times, then, high vibration rolling for 2-5 times, and finally, final pressing: static pressure is carried out for 1 to 3 times for collecting the surface.
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