CN112030939A

CN112030939A - Method for quickly condensing and curing soft foundation of dredger fill

Info

Publication number: CN112030939A
Application number: CN202010344108.8A
Authority: CN
Inventors: 李俊虎; 王文亮; 叶梅书
Original assignee: Jinhua Polytechnic
Current assignee: Jinhua Polytechnic
Priority date: 2020-04-27
Filing date: 2020-04-27
Publication date: 2020-12-04
Anticipated expiration: 2040-04-27
Also published as: CN112030939B

Abstract

The invention discloses a method for quickly condensing and curing a soft foundation of dredger fill, which comprises the following steps: analyzing the basic properties of the dredger fill; step, according to the result of the step, carrying out a dredger fill unit body test, and determining the optimal proportion of components such as a flocculating agent, gypsum, quicklime, sodium carbonate, an FDN water reducing agent, water glass, triethanolamine and the like in a curing agent formula, so that the dredger fill is quickly flocculated and effectively cured; determining the optimal proportion according to the experimental result of the step, and mixing the dredger fill and the curing agent by using an accurate mixing system; step, the mixture in the step is utilized to carry out foundation reinforcement of the dredger fill; and step (3) detecting and inspecting the soft foundation of the dredger fill. The invention provides a method for quickly coagulating and solidifying a soft foundation of dredger fill, aiming at the current situation and the defects of foundation treatment and realizing the quick coagulation and solidification of suspended particles.

Description

Method for quickly condensing and curing soft foundation of dredger fill

Technical Field

The invention relates to a method for quickly coagulating and solidifying a soft foundation of dredger fill.

Background

The dredger fill is also called as filling soil, is formed by hydraulic filling sand, and is one of the common artificial fills in coastal areas of China, and mainly because of the regulation or dredging of river channels, or because of the need of filling or raising some sections near rivers in industrial and agricultural production, the sand dug out by a dredger is discharged to the sections needing to be raised and the sand accumulation areas through a mud conveying pipe, the former is planned and purposefully raised, and the latter is purposeless accumulated, and a large filling soil layer is formed after precipitation and drainage.

Due to the shortage of land resources and the demand for port dredging, land reclamation from sea becomes a main means for obtaining land resources in coastal areas. However, the original extensive and low investment of the offshore reclamation land inevitably causes engineering sequelae, such as engineering safety, durability, disaster resistance, interference with coastline and beach ecological environment and other problems. How to improve the technical content of engineering and improve the social, economic, environmental and other comprehensive benefits becomes the focus of multi-party attention. The dredger fill adopted for land reclamation from the sea has the characteristics of high porosity, high compressibility, high water content and low bearing capacity, so the reinforcement treatment of the artificial dredger fill soft soil foundation becomes an inevitable technical difficulty. It has been the conventional practice to perform natural deposition consolidation for 2-3 years after the blow-filling, and then perform consolidation treatment. This is time consuming and also very labor intensive. Therefore, the development of a more reasonable and more economic reinforcing technology for the blow-filled soft soil foundation has important significance.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a method for quickly condensing and solidifying soft foundation of dredger fill, and aims at the current situation and the defects of foundation treatment to realize the quick condensation and solidification of suspended particles.

In order to solve the technical problem, the invention solves the technical scheme that the method for quickly coagulating and solidifying the soft foundation of the dredger fill comprises the following steps: analyzing the basic properties of the dredger fill; step, according to the result of the step, carrying out a dredger fill unit body test, and determining the optimal proportion of components such as a flocculating agent, gypsum, quicklime, sodium carbonate, an FDN water reducing agent, water glass, triethanolamine and the like in a curing agent formula, so that the dredger fill is quickly flocculated and effectively cured; determining the optimal proportion according to the experimental result of the step, and mixing the dredger fill and the curing agent by using an accurate mixing system; step, the mixture in the step is utilized to carry out foundation reinforcement of the dredger fill; and step (3) detecting and inspecting the soft foundation of the dredger fill.

In the technical scheme, in the steps, the basic properties of the dredger fill are analyzed, the particle size composition of the dredger fill is tested by a microscope, the physical properties of the dredger fill, such as water content, density, porosity, saturation and the like, are tested, the mineral composition of the dredger fill is analyzed by X-ray diffraction, the chemical composition of the dredger fill is analyzed by X-ray spectroscopy, the microstructure change characteristics of the dredger fill before and after solidification are observed by an SEM electron microscope test, and the nature of water-soil balance of the dredger fill slurry is revealed.

In the technical scheme, in the steps, the unit body test is used for determining the mixing amount ratio of the curing agent to the dredger fill according to requirements of foundation bearing capacity characteristic values and allowable deformation values designed for dredger fill soil conditions, field conditions and foundation treatment of dredger fill foundations.

In the technical scheme, the steps include the mixed reinforcement design of curing agents for curing the hydraulic fill foundation and the hydraulic fill, the shear strength index, the compression modulus and the thickness of a reinforced soil layer of the cured hydraulic fill are determined, the requirements of the bearing capacity characteristic value and the allowable deformation value of the foundation designed for foundation treatment are met, and the shallow soft soil foundation is reinforced by stirring and solidifying the curing agents and the hydraulic fill.

In the technical scheme, the accurate material mixing system comprises a feeding bin, a mixing and stirring bin, a motor, a vibrating plate and a temporary storage bin; the feeding bin comprises two separated cavities, and the two cavities are respectively connected with a dredger fill feeding pipe and a curing agent feeding pipe which are positioned at the top of the feeding bin; an ultrasonic part is arranged at an inlet of a cavity connected with a curing agent feeding pipe, and the ultrasonic part is used for crushing and vibrating the transported curing agent, so that molecular action force is weakened due to accelerated movement of molecules in each component of the curing agent, and particles of each component of the curing agent are refined; the bottoms of the two cavities are respectively provided with a material conveying channel which is connected with the mixing and stirring bin; the mixing and stirring bin is provided with a mixing cylinder, a spiral stirring rod is arranged in the mixing cylinder, the spiral stirring rod is used for stirring the mixture in the mixing cylinder and extruding and pushing the mixture to the front end of the mixing cylinder, a vibrating plate is connected to the lower part of the front end of the mixing cylinder, a lead is connected to the vibrating plate and is grounded, an electrode plate is arranged above the vibrating plate, and the electrode plate breaks through the mixture on the vibrating plate after being connected with high voltage; the temporary storage bin is arranged below the bottom end of the vibrating plate.

In the technical scheme, impellers are arranged in two cavities of the feeding bin, and materials in the cavities are discharged into the material conveying channel by the impellers; the two impellers are respectively detachably connected with a driven gear disc and an upper belt wheel which are arranged on the outer wall of the feeding bin, the mixing and stirring bin is arranged below the feeding bin, a lower belt wheel is arranged on the outer wall of the mixing and stirring bin, and the lower belt wheel is connected with the spiral stirring rod; the feeding bin is characterized in that a motor platform is arranged beside the feeding bin, a motor is arranged on the motor platform, an output shaft of the motor is in keyed connection with a motor gear disc, the motor gear disc is connected with a driven gear disc in a meshed mode, a belt wheel disc is arranged on the motor gear disc, the belt wheel disc is provided with at least two belt grooves with different diameters, belts are arranged in the belt grooves, and the two belts are respectively connected with the upper belt wheel and the lower belt wheel. And a plurality of supporting legs are arranged on the side edge of the feeding bin.

In the technical scheme, a top column is arranged at the bottom of the motor platform, the top column is movably arranged in a cylinder barrel and controlled by the cylinder barrel to lift, the cylinder barrel is fixedly arranged on a base, a cross beam is arranged on the outer wall of the feeding bin, a first distance measuring probe and a second distance measuring probe are arranged on the cross beam, the first distance measuring probe is positioned above the driven gear disc and used for detecting the distance between the top of the outer circular surface of the driven gear disc and the top of the outer circular surface of the driven gear disc, and the second distance measuring probe is positioned above the motor gear disc and used for detecting the distance between the top of the outer circular surface of the motor gear disc and; the first distance measuring probe and the second distance measuring probe can control the work of the cylinder barrel.

In the technical scheme, the base is also provided with a guide rod, the side edge of the motor platform is connected with an auxiliary platform, and the guide rod penetrates through the auxiliary platform to generate a guide effect on the up-and-down movement of the auxiliary platform; a wheel seat is arranged on the auxiliary platform, a movable table is arranged above the wheel seat, a mandril capable of moving up and down is arranged between the movable table and the wheel seat, and a tension wheel is arranged on the movable table; the wheel seat is provided with a bolt, the side edge of the ejector rod is provided with a pin hole, and the bolt is inserted into the pin hole so as to limit the movement of the ejector rod.

In the technical scheme, a baffle is arranged above the front end of the vibrating plate, the mixture extruded by the mixing cylinder is blocked by the baffle so as to fall onto the vibrating plate, and insulating side plates are arranged on two sides of the vibrating plate; the temporary storage bin is internally divided into an inlet part and an outlet part by a partition plate, the inlet part is provided with an inlet and the bottom end of a vibrating plate is arranged at the inlet part, the bottom of the inlet part is provided with an inclined bottom plate, the inclined bottom plate guides a mixed material to the outlet part, the outlet part is provided with a discharge pipe, and the bottom of the partition plate is lower than the height of the discharge pipe.

In the technical scheme, the cross section S1 at the inlet of the mixing barrel is 1.5 to 2 times of the cross section S2 at the outlet.

The invention provides a method for quickly coagulating and solidifying a soft foundation of dredger fill, aiming at the current situation and the defects of foundation treatment and realizing the quick coagulation and solidification of suspended particles.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be discussed below, it is obvious that the technical solutions described in conjunction with the drawings are only some embodiments of the present invention, and for those skilled in the art, other embodiments and drawings can be obtained according to the embodiments shown in the drawings without creative efforts.

FIG. 1 is a schematic view of the feed bin and its surrounding structure of the present invention.

Fig. 2 is a schematic view of the motor and its peripheral structure of the present invention.

FIG. 3 is a schematic view of the temporary storage silo and its surrounding structure.

In the figure, 1 is a feeding bin, 10 is an ultrasonic part, 11 is a dredger fill feeding pipe, 12 is a curing agent feeding pipe, 13 is a driven gear disc, 14 is an upper belt wheel, 15 is a material conveying channel, 16 is a cross beam, 161 is an A distance measuring probe, 162 is a B distance measuring probe, and 17 is a supporting leg; 2 is a mixing and stirring bin, 21 is a lower belt wheel, and 22 is a mixing barrel; 3 is a base, 31 is a cylinder barrel, 32 is a top column, and 33 is a guide rod; 4 is a motor platform, and 41 is an auxiliary platform; 5 is a motor, 51 is an output shaft, 52 is a motor gear disc, and 53 is a belt wheel disc; 6 is a tension wheel, 61 is a wheel seat, 62 is a movable table, 63 is a mandril, 631 is a bolt, and 64 is a wheel frame; 7 is a vibrating plate, 71 is a vibrating piece, 72 is an electrode plate, 73 is an insulating side plate, and 74 is a baffle plate; the temporary storage bin 8 is a temporary storage bin, the partition plate 80 is an inlet part 81, the outlet part 82 is an inlet part 83, the inclined bottom plate 84 is an inlet, and the discharge pipe 85 is an outlet.

Detailed Description

The technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments described herein without the need for inventive work, are within the scope of the present invention.

The embodiment of the invention provides a method for quickly coagulating and solidifying a soft foundation of dredger fill.

As shown in fig. 1 to 3, a method for rapidly coagulating and solidifying a soft foundation of a dredger fill comprises the following steps: step 1, analyzing basic properties of dredger fill; step 2, performing a dredger fill unit body test according to the result of the step 1, and determining the optimal proportion of the components such as the flocculating agent, the gypsum, the quicklime, the sodium carbonate, the FDN water reducing agent, the water glass, the triethanolamine and the like in the curing agent formula, so that the dredger fill is quickly flocculated and effectively cured; step 3, determining the optimal proportion according to the experimental result of the step 2, and mixing the dredger fill and the curing agent by using an accurate mixing system; step 4, performing foundation reinforcement on the dredger fill by using the mixture in the step 3; and 5, detecting and inspecting the soft foundation of the dredger fill.

In the step 1, basic properties of the dredger fill are analyzed, the particle size composition of the dredger fill is tested by a microscope, physical properties of the dredger fill, such as water content, density, porosity, saturation and the like, are tested, mineral composition of the dredger fill is analyzed by X-ray diffraction, chemical components of the dredger fill are analyzed by X-ray spectroscopy, microstructure change characteristics of the dredger fill before and after solidification are observed by an SEM electron microscope test, and the nature of water-soil balance of the dredger fill slurry is revealed.

In the step 2, the unit body test is used for determining the mixing amount ratio of the curing agent to the dredger fill according to the requirements of foundation bearing capacity characteristic values and allowable deformation values designed for dredger fill soil conditions, field conditions and foundation treatment of the dredger fill foundation.

And 4, performing mixed reinforcement design of a curing agent for curing the dredger fill foundation and the dredger fill, determining the shear strength index, the compression modulus and the thickness of a reinforced soil layer of the cured dredger fill, meeting the requirements of the characteristic value of the bearing capacity of the foundation and the allowable deformation value of the foundation designed for foundation treatment, and stirring and solidifying the curing agent and the dredger fill to finish the reinforcement of the shallow soft soil foundation.

The accurate material mixing system comprises a feeding bin 1, a mixing and stirring bin 2, a motor 5, a vibrating plate 7 and a temporary storage bin 8; the feeding bin 1 comprises two separated cavities which are respectively connected with a dredger fill feeding pipe 11 and a curing agent feeding pipe 12 which are positioned at the top of the feeding bin 1; an ultrasonic part is arranged at an inlet of a cavity connected with the curing agent feeding pipe 12, and the ultrasonic part is used for crushing and vibrating the transported curing agent, so that molecular action force is weakened due to accelerated molecular motion in each component of the curing agent, and particles of each component of the curing agent are refined; the bottoms of the two cavities are respectively provided with a material conveying channel 15, and the material conveying channels 15 are connected with the mixing and stirring bin 2; the mixing and stirring bin 2 is provided with a mixing cylinder 22, a spiral stirring rod is arranged in the mixing cylinder 22, the spiral stirring rod is used for stirring the mixture in the mixing cylinder 22 and extruding and pushing the mixture to the front end, a vibrating plate 7 is connected below the front end of the mixing cylinder 22, the vibrating plate 7 is connected with a lead and grounded, an electrode plate 72 is arranged above the vibrating plate 7, and the electrode plate 72 punctures the mixture on the vibrating plate 7 after being connected with high voltage electricity; the temporary storage bin 8 is arranged below the bottom end of the vibrating plate 7.

Impellers are arranged in the two cavities of the feeding bin 1, and materials in the cavities are discharged into the material conveying channel by the impellers; the two impellers are respectively detachably connected with a driven gear disc 13 and an upper belt wheel 14 which are arranged on the outer wall of the feeding bin 1, the mixing and stirring bin 2 is arranged below the feeding bin 1, a lower belt wheel 21 is arranged on the outer wall of the mixing and stirring bin 2, and the lower belt wheel 21 is connected with the spiral stirring rod; the other motor platform 4 that is provided with in feeding storehouse 1 side, be provided with motor 5 on the motor platform 4, the output shaft 51 key-type of motor 5 is connected with motor gear dish 52, motor gear dish meshing is connected driven gear dish 13, be provided with band pulley dish 53 on the motor gear dish 52, band pulley dish 53 is provided with the trough of belt that two at least diameters are different, be provided with the belt in the trough of belt, two belts are connected respectively go up band pulley 14 with band pulley 21 down. The side of the feeding bin 1 is provided with a plurality of supporting legs 17.

This accurate compounding system can adjust according to the ratio to make dredger fill and curing agent with fixed proportion, carry and mix the stirring to mixing in the stirring storehouse 2. Wherein, the volumes of the two cavities in the feeding bin 1 are consistent, so the sizes of the adopted impellers are also the same. The proportion is determined by the rotational speed of the impeller. The impeller of the dredger fill is externally connected with a driven gear disc 13, and the impeller of the curing agent is externally connected with a belt wheel 14. The driven gear wheel 13 is engaged with the motor gear wheel 52, and the upper belt wheel 14 is connected with the belt wheel 53 in a belt transmission way. The driven gear disc 13 has a smaller diameter and a smaller number of teeth than the motor gear disc 52, so that the motor gear disc 52 rotates more than one turn to drive the driven gear disc 13 to rotate. In belt drive, the size of the upper pulley 14 is larger than the pulley disc 53, so the pulley disc 53 rotates for one circle, and the rotation of the upper pulley 14 is not yet in time. This is determined by the transmission ratio, so that the transmission ratio can be determined when the ratio is determined, and the transmission ratio of the motor gear disc 52 and the driven gear disc 13 and the transmission ratio of the upper pulley 14 and the pulley disc 53 can be determined by mathematical relations, and the rotating speeds of the motor gear disc 52 and the pulley disc 53 are consistent, so that the size data of the driven gear disc 13 and the size data of the upper pulley 14 which are finally adopted can be determined. By replacing the appropriate driven gear wheel 13 and upper pulley 14 to take part in the work, the proportion between the dredger fill and the curing agent can be ensured.

The bottom of the motor platform 4 is provided with a top pillar 32, the top pillar 32 is movably arranged in a cylinder barrel 31 and controlled by the cylinder barrel 31 to lift, the cylinder barrel 31 is fixedly arranged on the base 3, the outer wall of the feeding bin 1 is provided with a cross beam 16, the cross beam 16 is provided with a first distance measuring probe 161 and a second distance measuring probe 162, the first distance measuring probe 161 is positioned above the driven gear disc 13 and used for detecting the distance between the top of the outer circular surface of the driven gear disc 13 and the top of the outer circular surface of the motor gear disc 52, and the second distance measuring probe 162 is positioned above the motor gear disc 52 and used for detecting the distance between the top of the outer circular surface of the motor gear disc; the first distance measuring probe 161 and the second distance measuring probe 162 can control the operation of the cylinder 31.

The base 3 is also provided with a guide rod 33, the side edge of the motor platform 4 is connected with an auxiliary platform 41, and the guide rod 33 penetrates through the auxiliary platform 41 to generate a guide effect on the up-and-down movement of the auxiliary platform 41; a wheel seat 61 is arranged on the auxiliary platform 41, a movable table 62 is arranged above the wheel seat 61, a mandril 63 capable of moving up and down is arranged between the movable table 62 and the wheel seat 61, and a tension wheel 6 is arranged on the movable table 62; the wheel base 61 is provided with a latch 631, and the side of the top bar 63 is provided with a pin hole, and the latch 631 is inserted into the pin hole to limit the movement of the top bar 63.

After the adjustment and replacement of the appropriate driven gear wheel 13 and the engagement of the upper pulley 14, the position of the motor gear wheel 52 is adjusted to fit the driven gear wheel 13, i.e. the height of the motor is adjusted. The actual specific height of the motor is determined by the size of the driven gear wheel 13 and the height of the front shape of the motor. Therefore, the present invention provides the first distance measuring probe 161 and the second distance measuring probe 162 for detection, the first distance measuring probe 161 measures the size change of the replaced driven gear plate 13, and the second distance measuring probe 162 measures the front height of the motor gear plate 52. And a calculation processing center is further arranged in the cross beam, and is used for calculating the actual specific height value according to the size change and the front shape height, then driving the cylinder barrel 31 to work, and lifting or lowering the height of the motor to enable the motor to accord with the actual specific height value. In this operation, when the driven gear plate 13 and the upper pulley 14 are replaced, the motor needs to be moved down first so as not to affect the replacement operation. Therefore, to detect the motor height, the second distance measuring probe 162 is required to detect the height before replacement.

Further, the length of the belt needs to be adjusted after the upper pulley 14 is replaced. In order to avoid replacing the belt, the device is provided with the tensioning wheel, and the belt is adjusted through the tensioning wheel, so that the device can be continuously used under various conditions. Since the height of the tension pulley needs to be adjusted according to different situations, the apparatus is provided with a pulley base 61 and a movable table 62, and a pulley frame 64 is provided on the movable table 62, and the tension pulley is mounted on the pulley frame 64. The movable table 62 is jacked up by four push rods, pin holes are arranged on the side edges of the push rods 63, and after the position is adjusted, the inserted pins 631 are inserted into the pin holes so as to limit the movement of the push rods 63.

A baffle plate 74 is arranged above the front end of the vibrating plate 7, the mixture extruded by the mixing cylinder 22 is blocked by the baffle plate 74 and falls onto the vibrating plate 7, and two sides of the vibrating plate 7 are provided with insulating side plates 73; the temporary storage bin 8 is internally divided into an inlet portion 81 and an outlet portion 82 by a partition plate 80, the inlet portion 81 is provided with an inlet 83, the bottom end of the vibrating plate 7 is arranged at the inlet portion, the bottom of the inlet portion 81 is provided with an inclined bottom plate 84, the inclined bottom plate 84 guides the mixed material to the outlet portion 82, a discharge pipe 85 is arranged in the middle of the outlet portion 82, and the bottom of the partition plate 80 is lower than the height of the discharge pipe 85. The insulating side plates 73 restrain the mixture from being separated from the vibration plate and form a fixed direction so that the mixture can move in the fixed direction when the vibration plate 7 vibrates. The vibration plate 7 vibrates the mixture, can promote the mixed effect of dredger fill and curing agent, still makes the granule of the two rub at the heart, has promoted the temperature for the action time of curing agent. And when vibrating, the electrode plate 72 participates in work, and the mixture is broken down by high voltage electricity to act on molecules, so that the molecules are thinned and crushed, the motion activity of the molecules is increased, the action of a curing agent is accelerated, and the required time is shortened.

The cross section S1 at the inlet of the mixing drum 22 is 1.5 to 2 times the cross section S2 at the outlet. The arrangement is that the mixture is extruded in the mixing cylinder 22, so that the gaps among the inner particles are compressed, the friction among the particles is increased, the temperature of the particles is increased, and finally the effect of improving the curing agent is achieved.

In order to improve the effect of the curing agent, firstly, particles of the curing agent need to be smashed so that the curing agent can be uniformly and uniformly mixed with the dredger fill; second, there is a need to increase the activity of molecules, accelerate their movement and thus speed of action.

In this scheme, utilize ultrasonic wave portion at first to get into the curing agent in the feeding storehouse to the curing agent inlet pipe and carry out the breakage, utilize the characteristic of ultrasonic wave for the granule is inside to take place vibrations, makes the granule breakage from inside. The mixing and stirring bin and the mixing barrel are used for uniformly mixing the mixture, and in the stirring process, the temperature is increased due to the mutual friction of the particles.

Then, the mixture is vibrated by the vibrating plate 7 to be further uniformly mixed, and the motor plate is used for discharging to break down particles, so that the movement of molecules is accelerated, the activity of the molecules is improved, and the work of a curing agent is accelerated.

The temporary storage bin 8 is divided into two parts, an inlet part and an outlet part. The mixture just transferred from the vibrating plate 7 enters the inlet portion, then falls on the inclined bottom plate 84, and then slowly flows into the outlet portion. Finally, the mixture accumulated in the discharge section is conveyed away by the discharge pipe 85. The reason why the inlet portion and the outlet portion are provided is that the mixed material just dropped from the vibrating plate 7 is dispersed by gravity and does not form a dense fluid, and therefore, a large amount of air is mixed when the mixed material is conveyed. Therefore, it is necessary to deposit on the bottom and to convey the air through the discharge pipe 85 after the air is discharged.

The scheme of the invention comprises the following steps: (1) and (4) researching the physical and chemical properties of the dredger fill. The method is characterized in that the physical properties (such as density, water content, porosity, saturation and the like) of the dredger fill are tested through an indoor geotechnical test, and the physical and chemical components and microstructure change characteristics of the dredger fill after flocculation/solidification are analyzed by utilizing X-ray spectroscopy and SEM scanning, so that the water-soil balance and damage mechanism of the recent dredger fill slurry are researched.

(2) Research on soft base composite processing mechanism. The flocculation/solidification after-filling is taken as an object, the application of the dredger fill foundation treatment technology is taken as an aim, and the drainage consolidation mechanism of the flocculation/solidification after-filling is revealed through indoor tests and field application. The influence of the sedimentation of the dredger fill silt foundation on the plastic drainage plate and how to effectively avoid the indirect adverse effect of the foundation sedimentation on the vacuum preloading are researched by taking the change of the vacuum preloading soil deformation, the soil permeability, the vacuum degree transmission and the like along with the processing space and the preloading time as entry points; the method researches how to select proper arrangement intervals, driving depths and different section forms of the drainage plates in the range of the foundation treatment block, and improves the vacuum preloading construction process of the soft foundation of the dredger fill.

(3) And (5) research on practical engineering application. And (3) combining with actual engineering, carrying out treatment effect analysis on a newly hydraulically filled soil foundation formed in the reclamation land and character analysis on a building foundation on the reclamation land, further checking research results, and combining with actual measurement data to check the applicability of a new consolidation model. A new technology for composite treatment of soft foundation is researched, a method for improving composite treatment of foundation by aiming at dredger fill is provided, and a new method for providing rapid treatment for land reclamation from sea is provided. The method mainly researches and improves comprehensive technical working conditions of large-area vacuum preloading treatment technology, starts from construction management, construction technology, mechanical material allocation and the like, optimizes each link in the construction process by combining practical engineering experience, improves engineering quality, reduces engineering cost and construction period and improves social and economic benefits on the premise of meeting post-construction requirements.

The innovation of the project of the invention is that: revealing the mechanism of vacuum preloading drainage consolidation and establishing a new calculation model conforming to the consolidation mechanism; provides a new method for quickly separating water from soil of dredger fill slurry and a new technology for solidifying the newly dredgefilled soil.

The method comprises the following actual steps: (1) analyzing the basic properties of the dredger fill, testing the particle size composition of the dredger fill by using a microscope, testing the physical properties of the dredger fill, such as water content, density, porosity, saturation and the like, analyzing the mineral composition of the dredger fill by using X-ray diffraction, analyzing the chemical composition of the dredger fill by using X-ray spectrum, and observing the microstructure change characteristics of the dredger fill before and after solidification by using an SEM electron microscope test to reveal the nature of water-soil balance of the dredger fill slurry. (2) The curing agent formula research is carried out, and the optimum proportion of flocculant, gypsum, quicklime, sodium carbonate, FDN water reducing agent, water glass (sodium silicate), triethanolamine and the like in the curing agent formula is found through a reinforced dredger fill unit body test, so that the dredger fill is quickly flocculated and effectively cured. (3) The research on the mechanical property of the dredger fill after solidification is that the dredger fill is reinforced by a curing agent, the mechanical property index of the solidified dredger fill is measured by using geotechnical tests such as a direct shear test and a triaxial shear test, and the drainage consolidation mechanism of the dredger fill after flocculation/solidification is revealed by an indoor model test. (4) The experimental application is combined with actual engineering to open up a test land about 500 square meters, the foundation treatment effect analysis of the surrounding sea reclamation land and the character analysis of the building foundation on the surrounding sea reclamation land are carried out, theoretical research results are applied, and the using effect of the experimental land is verified. The method has the advantages that the construction process is improved and the construction cost is reduced through model tests and numerical simulation researches, the final effect problem is solved through the consolidation mechanism researches of a vacuum preloading method, the soft foundation strength is improved, the foundation settlement is reduced, and a new method for rapidly treating the land reclamation area from the sea is provided.

Aiming at the particularity of high porosity ratio, high compressibility, high water content and low bearing capacity of the dredger fill used for land reclamation from the sea, the invention researches and realizes the rapid agglomeration and solidification of suspended particles by applying a physical method and a chemical method; and then, aiming at the current situation and the existing defects of the foundation treatment, a new foundation composite treatment technology is researched, and a new calculation method of the foundation composite treatment is provided based on a mechanical model considering the physical characteristics of the soil body. The method aims to reduce the work amount of reclamation projects by using recent dredger fill, shorten the construction period, reduce the construction cost, improve the strength of dredger fill soft soil foundations, simultaneously hopefully solve the problem that the dredging sludge of the river channel is difficult to treat, realize the reutilization of resources, and has great significance for the ecological environment protection in the current urbanization process of China.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive. The scope of the invention is indicated by the appended claims, rather than the foregoing description, and all changes that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. A method for rapidly coagulating and solidifying a soft foundation of dredger fill is characterized by comprising the following steps: step 1, analyzing basic properties of dredger fill; step 2, performing a dredger fill unit body test according to the result of the step 1, and determining the optimal proportion of the components such as the flocculating agent, the gypsum, the quicklime, the sodium carbonate, the FDN water reducing agent, the water glass, the triethanolamine and the like in the curing agent formula, so that the dredger fill is quickly flocculated and effectively cured; step 3, determining the optimal proportion according to the experimental result of the step 2, and mixing the dredger fill and the curing agent by using an accurate mixing system; step 4, performing foundation reinforcement on the dredger fill by using the mixture in the step 3; and 5, detecting and inspecting the soft foundation of the dredger fill.

2. The method according to claim 1, wherein the basic properties of the dredger fill are analyzed in step 1, and the method comprises the steps of testing the grain size composition of the dredger fill by using a microscope, testing the physical properties of the dredger fill, such as water content, density, porosity, saturation and the like, analyzing the mineral composition of the dredger fill by using X-ray diffraction, analyzing the chemical composition of the dredger fill by using X-ray spectroscopy, and observing the microstructure change characteristics of the dredger fill before and after solidification by using SEM electron microscope tests to reveal the nature of water-soil balance of the dredger fill.

3. The method according to claim 1, wherein in the step 2, the foundation bearing capacity characteristic value and the allowable deformation value of the foundation design for the dredger fill soil condition, the field condition and the foundation treatment of the dredger fill foundation are required by the unit body test, and the mixing amount ratio of the curing agent and the dredger fill soil is determined.

4. The method as claimed in claim 1, wherein the step 4 comprises performing a curing agent and dredger fill mixed reinforcement design for curing the dredger fill foundation, determining the shear strength index, the compression modulus and the thickness of the reinforced soil layer of the cured dredger fill to meet the requirements of the bearing capacity characteristic value and the allowable deformation value of the foundation designed for foundation treatment, and completing the reinforcement of the shallow soft soil foundation by stirring and solidifying the curing agent and the dredger fill.

5. The method according to claim 1, characterized in that the precise mixing system comprises a feeding bin (1), a mixing and stirring bin (2), a motor (5), a vibrating plate (7) and a temporary storage bin (8); the feeding bin (1) comprises two separated cavities which are respectively connected with a dredger fill feeding pipe (11) and a curing agent feeding pipe (12) which are positioned at the top of the feeding bin (1); an ultrasonic part is arranged at an inlet of a cavity connected with a curing agent feeding pipe (12), and the ultrasonic part is used for crushing and vibrating the transported curing agent, so that molecular action force is weakened due to acceleration of molecular activities in each component of the curing agent, and particles of each component of the curing agent are refined; the bottoms of the two cavities are respectively provided with a material conveying channel (15), and the material conveying channels (15) are connected with the mixing and stirring bin (2); the mixing and stirring bin (2) is provided with a mixing cylinder (22), a spiral stirring rod is arranged in the mixing cylinder (22), the spiral stirring rod is used for stirring the mixture in the mixing cylinder (22) and extruding and pushing the mixture to the front end of the mixing cylinder, a vibrating plate (7) is connected below the front end of the mixing cylinder (22), the vibrating plate (7) is connected with a lead and grounded, an electrode plate (72) is arranged above the vibrating plate (7), and the electrode plate (72) punctures the mixture on the vibrating plate (7) after being connected with high voltage electricity; the temporary storage bin (8) is arranged below the bottom end of the vibrating plate (7).

6. The method as claimed in claim 5, characterized in that impellers are arranged in the two cavities of the feeding bin (1) and the impellers are used for discharging the materials in the cavities into the conveying channel; the two impellers are respectively detachably connected with a driven gear disc (13) and an upper belt wheel (14) which are arranged on the outer wall of the feeding bin (1), the mixing and stirring bin (2) is arranged below the feeding bin (1), a lower belt wheel (21) is arranged on the outer wall of the mixing and stirring bin (2), and the lower belt wheel (21) is connected with the spiral stirring rod; the feeding bin (1) is provided with motor platform (4) by the side, be provided with motor (5) on motor platform (4), output shaft (51) key-type connection of motor (5) has motor gear dish (52), motor gear dish meshing is connected driven gear dish (13), be provided with band pulley dish (53) on motor gear dish (52), band pulley dish (53) are provided with the trough of belt that two at least diameters are different, be provided with the belt in the trough of belt, two belts are connected respectively go up band pulley (14) with band pulley (21) down.

7. The method according to claim 6, characterized in that a top pillar (32) is arranged at the bottom of the motor platform (4), the top pillar (32) is movably arranged in a cylinder barrel (31) and controlled by the cylinder barrel to lift, the cylinder barrel (31) is fixedly arranged on a base (3), a cross beam (16) is arranged on the outer wall of the feeding bin (1), an A distance measuring probe (161) and a B distance measuring probe (162) are arranged on the cross beam (16), the A distance measuring probe (161) is positioned above the driven gear plate (13) and used for detecting the distance between the top of the outer circular surface of the driven gear plate (13) and the B distance measuring probe (162) is positioned above the motor gear plate (52) and used for detecting the distance between the top of the outer circular surface of the motor gear plate (52) and the B distance measuring probe; the first distance measuring probe (161) and the second distance measuring probe (162) can control the work of the cylinder barrel (31).

8. The method according to claim 7, characterized in that a guide rod (33) is further arranged on the base (3), an auxiliary platform (41) is connected to the side of the motor platform (4), and the guide rod (33) penetrates through the auxiliary platform (41) to generate a guide effect for the up-and-down movement of the auxiliary platform; a wheel seat (61) is arranged on the auxiliary platform (41), a movable table (62) is arranged above the wheel seat (61), a mandril (63) capable of moving up and down is arranged between the movable table (62) and the wheel seat (61), and a tension wheel (6) is arranged on the movable table (62); the wheel seat (61) is provided with a bolt (631), the side of the ejector rod (63) is provided with a pin hole, and the bolt (631) is inserted into the pin hole so as to limit the movement of the ejector rod (63).

9. The method according to claim 5, characterized in that a baffle plate (74) is arranged above the front end of the vibrating plate (7), the mixture extruded by the mixing cylinder (22) is blocked by the baffle plate (74) to fall onto the vibrating plate (7), and two sides of the vibrating plate (7) are provided with insulating side plates (73); divide into in temporary storage silo (8) by baffle (80) and advance portion (81) and go out portion (82), the bottom that advances portion (81) and be provided with import (83) and vibration board (7) sets up in this department, it is provided with inclined bottom plate (84) to advance portion (81) bottom, inclined bottom plate (84) guide mixture to portion (82) of going out, portion (82) middle part is provided with discharging pipe (85), baffle (80) bottom is less than the height of discharging pipe (85).

10. The method according to claim 5, characterized in that the cross section S1 at the inlet of the mixing drum (22) is 1.5 to 2 times the cross section S2 at the outlet.