CN104532817A - Site mixing and blow-filling method of solidified dredged mud - Google Patents
Site mixing and blow-filling method of solidified dredged mud Download PDFInfo
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- CN104532817A CN104532817A CN201410664736.9A CN201410664736A CN104532817A CN 104532817 A CN104532817 A CN 104532817A CN 201410664736 A CN201410664736 A CN 201410664736A CN 104532817 A CN104532817 A CN 104532817A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D1/00—Investigation of foundation soil in situ
- E02D1/08—Investigation of foundation soil in situ after finishing the foundation structure
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
- E02D3/126—Consolidating by placing solidifying or pore-filling substances in the soil and mixing by rotating blades
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
- E02D2300/0021—Mortar
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Abstract
The invention discloses a site mixing and blow-filling method of solidified dredged mud. The method comprises the steps of: (1) site mixing and blow-filling of the solidified dredged mud; (2) site solidification of the dredged mud; and (3) detection of the solidified dredged mud. The step (1) further comprises analysis of the soil texture of the dredged mud, selection of a curing agent, determination of a mixing ratio of the curing agent to the dredged mud, mixing of the curing agent and the dredged mud, reinforcing design of the solidified dredged mud and determination of the shear strength index, the modulus of compressibility of the solidified dredged mud and the thickness of a reinforced soil layer to achieve characteristic values of the bearing capacity of foundation soil and allowing deformation values of the foundation treatment design, and determination of the maintenance time of finished products. The step (2) is to finish the reinforcement of a shallow-layer soft soil foundation through mixing and solidifying the curing agent and the dredged mud. The site mixing and blow-filling method of the solidified dredged mud can achieve the purposes of guarantee of the construction days, reduction of the project cost, reasonable resource utilization and environmental protection.
Description
Technical field
The present invention relates to the on-the-spot mixed hydraulically-filled technology of a kind of dredged mud, particularly, relate to a kind of mixed hydraulically-filled method in scene of solidifying dredged mud.
Background technology
In the Dredging Process in harbour, navigation channel, the dredging silt quantity that usually can produce is more, and the process problem of dredged mud seems particularly outstanding in the middle of the construction and maintenance in harbour, navigation channel.The dredged mud produced in dredging works adopts the method stacked or abandon usually; stacking will take a large amount of soils; and effective utilization that mud has had a strong impact on marine resources is thrown in ocean; and comparatively havoc is all caused to the water environment of ocean, geological environment, ecological environment; contradiction between dredged spoil and marine environmental protection, is also subject to the restriction of each side more and more.And stacking and abandoning in the process of dredged mud, need transport and the construction cost of at substantial, the more important thing is and cause resource serious waste and environment pollution.
In addition, in the process of construction of the coastal engineerings such as marine port, a large amount of cubic metres of earth and stone is usually needed to carry out sea reclamation.China coast port city multidigit is in alluvial plain and Delta Area, and will obtain a large amount of cubic metres of earth and stone in locality more difficult, remote Mining Transport is uneconomical again.By being cured process to dredged mud, " improveing its high-moisture percentage, low intensive character and become the soil with good engineering properties and used, is the better method solving above two contradictions.
What dredged mud is used for fill material can solve a large amount of earth material needed for embankment carrys out source problem, have and can solve a large amount of dredged mud produced due to harbour and developing and maintaining of navigation channel and take up an area and stack and the ecological problems such as severe contamination are produced to marine environment, meet the sustainable development of building trade.
Summary of the invention
The object of this invention is to provide the on-the-spot mixed hydraulically-filled technology of a kind of dredged mud for embankment, propose the key technology of the on-the-spot mixed hydraulically-filled curing of dredged mud, additive and solidification index, for the mixed hydraulically-filled demonstration of dredged mud provides technical guarantee.
In order to achieve the above object, the invention provides a kind of mixed hydraulically-filled method in scene of solidifying dredged mud, wherein, the method comprises: step 1, is cured dredged mud scene mixed hydraulically-filled; Step 2, carries out dredged mud field-hardened; Step 3, is cured the detection of dredged mud.
The mixed hydraulically-filled method in scene of above-mentioned solidification dredged mud, wherein, also comprises technical work in early stage before step 1.This process comprises: collect engineering data; Dredger Filling Engineering field investigation; Provide geotechnical investigation report; Dredged mud source site investigation; Determine Dredger Filling Engineering overview; Determine bank land-based area engineering specifications; Determine the Construction Arrangement of solidifying the on-the-spot mixed hydraulically-filled engineering of dredged mud; Sample analysis; Prepare Dredger Filling Engineering construction information etc.
The mixed hydraulically-filled method in scene of above-mentioned solidification dredged mud, wherein, described step 1 comprises: step 1.1, carries out soil analysis to dredged mud, and index comprises dredged mud severe, moisture content, specific gravity of soil particle, grading analysis, soil strength index and modulus of compressibility; Step 1.2, selects curing compound, determines the source of curing compound, main component and storage preservation condition etc.; Step 1.3, determines the mixing match of curing compound and dredged mud; According to ground reinforcement criteria, characteristic value of foundation bearing capacity, Allowable value of foundation deformation etc., by the solidification dredged mud Mix Ratio Test of different curing compound volume, be cured agent mix-design, proposes match ratio preferred value; The mixing ratio of curing compound and dredged mud is preferably large about about 3% to 10%; Step 1.4, mixes curing compound with dredged mud; Step 1.5, be cured the reinforcing design of dredged mud, according to the basement process designing requirement of engineering ground, according to engineering geology, hydrogeological conditions, with curing compound mix-design preferred value, determine the Shear Strength Index of solidification dredged mud, modulus of compressibility and reinforcing the thickness of the layer, reach characteristic value of foundation bearing capacity and the permissible deformation value requirement of basement process design; Preferably, determine that the Shear Strength Index of solidifying dredged mud is 1.100 ~ 1.300MPa, modulus of compressibility is 11 ~ 30Mp, reinforcing the thickness of the layer is 4 ~ 6m, and the characteristic value of foundation bearing capacity reaching basement process design is that 100 ~ 120Mp and permissible deformation value require to be 10% ~ 15%; Step 1.6, determines the curing time of finished product, determines the curing time solidifying dredged mud, be preferably maintenance 14-28 days at the standard conditions according to the laboratory test results of solidification dredged mud.
The mixed hydraulically-filled method in scene of above-mentioned solidification dredged mud, wherein, described step 1.2 selects curing compound to be count by weight to comprise 45 parts, lime, cement 125 parts, and exciting agent 2 parts.Described exciting agent is bases exciting agent or salt exciting agent.Described bases exciting agent be preferably in hydrated lime, NaOH or potassium hydroxide any one or a few.Described salt exciting agent be preferably in calcium sulfate, sodium sulphate, sodium carbonate or potash any one or a few.
The mixed hydraulically-filled method in scene of above-mentioned solidification dredged mud, wherein, described step 1.4, its process comprises: connect dredged mud pipeline, curing compound blender is installed in the position of the close dredged mud port of export on this pipeline, and blender is connected with curing compound tank, and blender is provided with curing compound valve; Opening curing compound valve makes curing compound enter dredged mud pipeline, and then dredged mud mixes with curing compound through blender position, and curing compound and dredged mud mixture spray.
The mixed hydraulically-filled method in scene of above-mentioned solidification dredged mud, wherein, described step 1.4, it is implemented technical indicator and comprises: the grain graininess of curing compound, moisture content; The adding rate of curing compound coordinates index with pipeline dredged mud caliber, solid content and flow velocity; The index of the incorporation that caliber, flow velocity, solid content and curing compound are per minute.Particularly, the grain graininess of powdered curing agent is preferably 100 to 200 orders, and moisture content is preferably 10%; The adding rate of curing compound is determined by curing compound optimum adding quantity of pulverized; The solid content passed through in on-the-spot dredged mud pipeline and flow velocity are measured, calculates the index of curing compound incorporation per minute.
The mixed hydraulically-filled method in scene of above-mentioned solidification dredged mud, wherein, described step 1.6, the curing time solidifying dredged mud is tentatively determined according to the laboratory test results of solidification dredged mud, due to dredged mud soil condition and the cofferdam infiltration condition at scene, the difference of engineering drainage condition, field sampling is needed finally to determine curing time.Scene determines that maintenance is tested, and need set up an office position, layering of cloth to take soil sample to carry out soil test, result of the test reaches Shear Strength Index, modulus of compressibility required value.Every 100m in works limit
2lay a some position, within the scope of solidification dredged mud reinforcement depth, every 1m samples 1.
The mixed hydraulically-filled method in scene of above-mentioned solidification dredged mud, wherein, described step 2 comprises: reinforce the shallow layer soft soil foundation at the mixed hydraulically-filled rear dredged mud scene of step 1 gained; Tabular soil layer is stablized on the upper strata forming soft foundation after reinforcing.Described shallow-layer refers to the soil body top layer of thickness within 6.0m.
The mixed hydraulically-filled method in scene of above-mentioned solidification dredged mud, wherein, described step 2 completes reinforcing to shallow layer soft soil foundation by curing compound and dredged mud being stirred consolidation; It comprises: soft foundation can be made to be stablized.In this whipping process, use stirring-head and excavator, the even speed of stirring-head under excavator swing arm drives is moved, makes curing compound slurries being evenly distributed in shallow layer soft soil foundation; When stirring, carry out unit area division to construction area, block-by-block completes.Stir the complete region of construction and spread out and put on sand material or mountain skin soil conduct heap carrier layer, be rolling bulldozed rear as next step operation platform, preloading layer thickness is generally between 0.3 ~ 1 meter.
Dredged mud foundation treatment engineering feature is shallow-layer process and soil layer high-moisture percentage problem.Shallow-layer process wants technical solution to equip problem, and the solution of high-moisture percentage problem is curing materials.Effective combination of shallow-layer process mixing plant and technique and high-efficiency curing agent consolidation process, constitutes the solution of dredged mud basement process.Stirring plant equipment and curing compound together form the main body of this technology.Curing compound is generally cement, lime, curing compound etc.Mixing plant is with excavator, and the mixing plant of deep-layer stirring equipment and boat form of dredging is main body.
The mixed hydraulically-filled method in scene of above-mentioned solidification dredged mud, wherein, described curing compound, for accounting for 75 ~ 83% containing fine sand, silty clay soil accounts for 10 ~ 23%, full water loose condition (of surface) containing the low Extra-fine sand of glutinous amount and silt matter dredged mud time, select powdered curing agent.The curing compound of described powdery comprises 45 parts, lime, cement 125 parts for counting by weight, and the curing compound of the powdery of exciting agent 2 parts.Described exciting agent is bases exciting agent or salt exciting agent.Described bases exciting agent be preferably in hydrated lime, NaOH or potassium hydroxide any one or a few.Described salt exciting agent be preferably in calcium sulfate, sodium sulphate, sodium carbonate or potash any one or a few.
The mixed hydraulically-filled method in scene of above-mentioned solidification dredged mud, wherein, described curing compound, accounting for 50 ~ 70% for mud clay content, moisture content between 90 ~ 110%, content of organics is 5 ~ 12%, chloride content is greater than 3% in water Muddy Bottoms dredged mud, select Muddy Bottoms hardener formula.Its composition mainly comprises dispersing agent, dehydrating agent and surfactant.According to the high-moisture percentage of mud, particle is tiny and content of organics is high feature, adjustment hardener formula, reduces dehydrating agent, strengthens dispersing agent, separately adds the inorganic material such as high-mark cement or levigate slag, grain slag, flyash, gypsum.Room lot of experiments determines ratio and the admixture quantity of compound prescription by experiment.This formula is configured powdered curing agent according to dredged mud moisture content, or employing formula is: meter comprises 45 parts, lime, cement 125 parts by weight, and liquid exciting agent 2 parts.
The mixed hydraulically-filled method in scene of above-mentioned solidification dredged mud, wherein, described step 3 comprises: to solidification dredged mud form behavior of foundation soil before reinforcing, in reinforcing process, reinforced after detect respectively.
The mixed hydraulically-filled method in scene of above-mentioned solidification dredged mud, wherein, described step 3, its Testing index comprises: carry out core boring sampling, static sounding, standard penetration test, vane shear test, unconfined compression strength test, low strain dynamic and load test at 70.7mm × 70.7mm × 70.7mm test cube.
Load test method point is arranged: in works limit, by every 10000m
2arrange a load test method point, test point absolute altitude is that basement process top mark is high.
Core boring sampling, static sounding, standard penetration test, vane shear test, unconfined compression strength: test, low strain test measuring points placement in works limit, by every 1000m
2arrange a test point, the sampling of core boring sampling, unconfined compression strength test samples 1 time along the every 1.0m of the degree of depth; Standard penetration test, vane shear test test 1 point along the every 1.0m of the degree of depth.
Standard penetration test (being called for short " mark passes through test "): mark passes through a kind of method that test is the bearing capacity of foundation soil measuring sand or cohesive soil at the scene.This method is by measuring the weight of predetermined weight from the free hammering ground of a certain certain height, and depth of penetration reaches blow counts during a certain value, to evaluate character and the bearing capacity of this place's foundation soil.Usual weight quality gets 63.5 ± 0.5kG, falls apart from getting 76 ± 2cm.It is a kind of soil exploration method that exploration combines with in situ test that mark passes through test, can obtain the cohesive soil ground standard value of bearing capacity be similar to quickly and easily.The scope of application is applicable to civil construction project, municipal administration, highway, engineering foundation soil in-situ test in general clay, weak soil, loess and close sand soil area.Predominant use.For finding out that stratum is in change that is vertical and horizontal direction; Carry out mechanics layering; Determine natural foundation bearing capacity and pro form bill pile capacity; Differentiate the possibility of sand liquefaction; Determine the undrained shear strength of weak soil; The parameter of load-carrying capacity of soft soil foundation and slope stability is provided.
Vane shear test: vane shear test is the in situ test that a kind of four-bladed vane measures soft clay shear strength.By cross wrench by holing in weak soil at the bottom of press-in hole, rotating with uniform speed, by certain measuring system, recording moment required when it rotates, until damage of soil body, thus calculating soil classifiction.The shear strength recorded by vane-shear test represents the Natural gas composition of soil.
Shallow-layer load plate test: by the rigid slab of certain size and geometry (circular or square) on proposed building place, be placed on tested soil supporting layer, increase load step by step, and the stable settlement recorded under every one-level load, until reach foundation failure standard, load (p)-sedimentation (s) curve (i.e. p-s curve) can be obtained thus.
The mixed hydraulically-filled method in scene of solidification dredged mud provided by the invention has the following advantages:
By the method, the position and the yardstick that solidify the on-the-spot mixed hydraulically-filled region of dredged mud can be determined, utilize field investigation and field investigation data, the factor of analyzing influence engineering; Grasp solidification dredging technology and device characteristics, arrange dredging, curing compound add with the relation of engineering entirety be connected; Be cured embodiment design and the technology application of dredged mud according to foundation engineering designing requirement, select embodiment and technical method economically; Reach and ensure the duration, reduce construction costs, make rational use of resources and the object of protection of the environment.
Detailed description of the invention
Below the specific embodiment of the present invention is further described.
The mixed hydraulically-filled method in scene of solidification dredged mud provided by the invention, comprises:
Step 1, is cured dredged mud scene mixed hydraulically-filled.
Step 2, carries out dredged mud field-hardened.
Step 3, is cured the detection of dredged mud.
Also comprise technical work in early stage before step 1.This process comprises: collect engineering data; Provide geotechnical investigation report; Dredged mud source site investigation; Determine Dredger Filling Engineering overview; Determine bank land-based area engineering specifications; Determine the Construction Arrangement of solidifying the on-the-spot mixed hydraulically-filled engineering of dredged mud; Dredger Filling Engineering field investigation; Sample analysis; Prepare Dredger Filling Engineering construction information etc.
Specifically comprise:
Collect engineering data: geotechnical investigation is reported; Engineering Zone hydrological data; Dredged mud source and soil analysis report thereof; The application technology of dredged mud engineering and equipment; Ship dredging construction unit type and technical data.
The Construction Arrangement of the on-the-spot mixed hydraulically-filled engineering of solidification dredged mud: engineering site is investigated; Geotechnical investigation report is read; Analysis on Hydrology Conditions; The job site layout plan of the on-the-spot mixed hydraulically-filled engineering of solidification dredged mud.
Sample analysis: soil sample is taked in place, dredged mud source; The soil test of soil sample and analysis; Soil sample index, severe, moisture content, specific gravity of soil particle, grain composition, liquid limit, plastic limit, intensity index, the modulus of compressibility of soil.
Dredger Filling Engineering construction information: the construction plan of the on-the-spot mixed hydraulically-filled engineering of solidification dredged mud; Construction program; The equipment of solidification dredging and technical condition; At the bottom of the layer of hydraulic fill foundation, the high and planar range of layer top mark; Ground stabilization object and bearing capacity 100 ~ 120Mp, deformation requirements 10% ~ 15%.
Step 1 comprises:
Step 1.1, carries out soil analysis to dredged mud, and index comprises dredged mud severe, moisture content, specific gravity of soil particle, grading analysis, soil strength index and modulus of compressibility.
Step 1.2, selects curing compound, determines that the source of curing compound mainly uses autogamy curing compound, also can carry out test adjustment to hardener formula to special soil property.Curing compound main component is cement, lime, exciting agent.Curing compound has stronger water imbibition, therefore answers water proof to store.Curing compound is preferably meter by weight and comprises 45 parts, lime, cement 125 parts, and exciting agent 2 parts.Exciting agent is bases exciting agent or salt exciting agent.Bases exciting agent be preferably in hydrated lime, NaOH or potassium hydroxide any one or a few.Salt exciting agent be preferably in calcium sulfate, sodium sulphate, sodium carbonate or potash any one or a few.
Step 1.3, determines the mixing match of curing compound and dredged mud; According to the ground stabilization requirement of different engineering demand, characteristic value of foundation bearing capacity, Allowable value of foundation deformation etc., by the solidification dredged mud Mix Ratio Test of different curing compound volume, be cured agent mix-design, proposes match ratio preferred value.The mixing ratio of curing compound and dredged mud is preferably large about about 3% to 10%.
The solidification dredged mud Mix Ratio Test Scheme Choice suggestion of different great soil group, different curing compound volume is in table 1.
The different curing compound volumes of the different great soil group of table 1.
Step 1.4, mixes curing compound with dredged mud.
The process of step 1.4 comprises: connect dredged mud pipeline, and curing compound blender is installed in the position of the close dredged mud port of export on this pipeline, and blender is connected with curing compound tank, and blender is provided with curing compound valve; Opening curing compound valve makes curing compound enter dredged mud pipeline, and then dredged mud mixes with curing compound through blender position, and curing compound and dredged mud mixture spray.
Step 1.4 is implemented technical indicator and is comprised: the grain graininess of powdered curing agent is preferably 100 to 200 orders, and moisture content is preferably 10%; The adding rate of curing compound is determined by curing compound optimum adding quantity of pulverized; The solid content passed through in on-the-spot dredged mud pipeline and flow velocity are measured, calculates the index of curing compound incorporation per minute.
Step 1.5, be cured the reinforcing design of dredged mud, according to the basement process designing requirement of engineering ground, according to engineering geology, hydrogeological conditions, with curing compound mix-design preferred value, determine the Shear Strength Index of solidification dredged mud, modulus of compressibility and reinforcing the thickness of the layer, reach characteristic value of foundation bearing capacity and the permissible deformation value requirement of basement process design.Preferably, determine that the Shear Strength Index of solidifying dredged mud is 1.100 ~ 1.300MPa, modulus of compressibility is 11 ~ 30Mp, reinforcing the thickness of the layer is 4 ~ 6m, and the characteristic value of foundation bearing capacity reaching basement process design is that 100 ~ 120Mp and permissible deformation value require to be 10% ~ 15%.
Step 1.6, determines the curing time of finished product, determines according to the laboratory test results of solidification dredged mud the curing time (being generally maintenance 14-28 days at the standard conditions) solidifying dredged mud.
Step 1.6 tentatively determines according to the laboratory test results of solidification dredged mud the curing time solidifying dredged mud, due to dredged mud soil condition and the cofferdam infiltration condition at scene, the difference of engineering drainage condition, needs field sampling finally to determine curing time.Scene determines that maintenance is tested, and need set up an office position, layering of cloth to take soil sample to carry out soil test, result of the test reaches Shear Strength Index, modulus of compressibility required value.Every 100m in works limit
2lay a some position, within the scope of solidification dredged mud reinforcement depth, every 1m samples 1.
Step 2 comprises: reinforce the shallow layer soft soil foundation at the mixed hydraulically-filled rear dredged mud scene of step 1 gained; Tabular soil layer is stablized on the upper strata forming soft foundation after reinforcing.Shallow-layer refers to the soil body top layer of thickness within 6.0m.
Step 2 completes reinforcing to shallow layer soft soil foundation by curing compound and dredged mud being stirred consolidation; Soft foundation can be made to be stablized.In this whipping process, use stirring-head and excavator, the even speed of stirring-head under excavator swing arm drives is moved, makes curing compound slurries being evenly distributed in shallow layer soft soil foundation; When stirring, carry out unit area division to construction area, block-by-block completes.
Dredged mud foundation treatment engineering feature is shallow-layer process and soil layer high-moisture percentage problem.Shallow-layer process wants technical solution to equip problem, and the solution of high-moisture percentage problem is curing materials.Effective combination of shallow-layer process mixing plant and technique and high-efficiency curing agent consolidation process, constitutes the solution of dredged mud basement process.Stirring plant equipment and curing compound together form the main body of this technology.Curing compound is generally cement, lime, curing compound etc.Mixing plant is with excavator, and the mixing plant of deep-layer stirring equipment and boat form of dredging is main body.
The curing compound adopted, for accounting for 75 ~ 83% containing fine sand, silty clay soil accounts for 10 ~ 23%, full water loose condition (of surface) containing the low Extra-fine sand of glutinous amount and silt matter dredged mud time, select powdered curing agent prescription.This formula comprises 45 parts, lime, cement 125 parts for counting by weight, and the curing compound of the powdery of exciting agent 2 parts.Exciting agent is bases exciting agent or salt exciting agent.Bases exciting agent be preferably in hydrated lime, NaOH or potassium hydroxide any one or a few.Salt exciting agent be preferably in calcium sulfate, sodium sulphate, sodium carbonate or potash any one or a few.
The curing compound adopted, accounting for 50 ~ 70% for mud clay content, moisture content between 90 ~ 110%, content of organics is 5 ~ 12%, chloride content is greater than 3% in water Muddy Bottoms dredged mud, select Muddy Bottoms hardener formula, formula is configured powdered curing agent according to dredged mud moisture content, or employing formula is: lime 45g, cement 125g, liquid exciting agent 2g.Its composition mainly comprises dispersing agent, dehydrating agent and surfactant etc.According to the high-moisture percentage of mud, particle is tiny and content of organics is high feature, adjustment hardener formula, reduces dehydrating agent, strengthens dispersing agent, separately adds the inorganic material such as high-mark cement or levigate slag, grain slag, flyash, gypsum.Room lot of experiments determines ratio and the admixture quantity of compound prescription by experiment.This formula is configured powdered curing agent according to dredged mud moisture content, or employing formula is: meter comprises 45 parts, lime, cement 125 parts by weight, and liquid exciting agent 2 parts.
The Muddy Bottoms dredged mud that hydraulic reclamation is formed and Extra-fine sand and silt matter dredged mud, when the degree of depth of the processing layer that needs reinforcement is no more than 6m, can adopt shallow top layer in-situ treatment.The a complete set of equipment composition being suitable for shallow poor subsoil process mainly comprises three parts, Part I is that slurrying supplies slurry part, comprises powdered curing agent storage tank, LCM storage tank, Admixture storage tank, solid-liquid mixed stirring device, high pressure slurry pump, the defeated slurry sebific duct of high pressure and conputer controlled room.Part II is Mechanical Moving main part, and its function comprises removable walking on the various soft or hard ground such as mud, sand, can drag the defeated slurry sebific duct of high pressure and curing compound slurries are transported to mixing plant place.Part III is mixing part, and its function is by mechanical agitation, the hardening slurry send high pressure feed pipe for mortar and mud, and the various foundation material of consolidation that needs such as fine sand stirs on the spot.
The reinforcing process of step 2 comprises, determine shallow-layer be processed into complete equipment for slurry mode, how much the supplied materials of stirring-head discharging opening is the function of time.The even speed of stirring-head under excavator swing arm drives moves, and makes curing compound slurries being evenly distributed in shallow-layer Ground Treatment.Construction area carries out unit area division by the operating efficiency of construction equipment, and block-by-block completes.According to the design strength of construction area, determined the proportioning of curing compound slurries by test in laboratory, during site operation, again curing compound volume is increased one percentage point.Mud and containing powder clay fine sand curing compound used be PM curing compound.This curing compound can use seawater, the fresh water slurrying of lake, river.Curing compound direct consolidation can use in shallow water and in high-moisture percentage soft layer, and general PM curing compound admixture 4 ~ 8%, determines according to design strength.Wet construction is called for slurry feed form.Mechanical Moving main body is that excavator adds stirring-head device.Shallow-layer process construction technology.Construction area first sets up stable operation platform, and rely on operation platform edge to construct one by one, block-by-block advances.Construction area is generally in excavator side, and excavator direction of advance is parallel with construction area, and minimum unit in charge of construction width is as the criterion with stirring-head width, and the limit range that length can reach with excavator swing arm is as the criterion.Stirring bar wide of constructing is 1.5 meters, and bar length is 7 meters, stablizes operation platform length and determines by machine-team and designing requirement.To have overlapping between construction area with construction area, to ensure construction quality.
Stir the complete region of construction and spread out and put on sand material or mountain skin soil conduct heap carrier layer, be rolling bulldozed rear as next step operation platform, preloading layer thickness is generally between 0.3 ~ 1 meter.Construction method is different according to using Mechanical Moving main body different, construction area and the moving direction of amphibious excavator and self-propelled dredge boat are opposing, can not build operation platform, but still will draw little construction area unit, and to have overlapping between construction area with construction area, to ensure construction quality.
Step 3 comprises: to solidification dredged mud form behavior of foundation soil before reinforcing, in reinforcing process, reinforced after detect respectively.Its Testing index comprises: carry out core boring sampling, static sounding, standard penetration test, vane shear test, unconfined compression strength test, low strain dynamic and load test at 70.7mm × 70.7mm × 70.7mm test cube.
Load test method point is arranged: in works limit, by every 10000m
2arrange a load test method point, test point absolute altitude is that basement process top mark is high.
Core boring sampling, static sounding, standard penetration test, vane shear test, unconfined compression strength: test, low strain test measuring points placement in works limit, by every 1000m
2arrange a test point, the sampling of core boring sampling, unconfined compression strength test samples 1 time along the every 1.0m of the degree of depth; Standard penetration test, vane shear test test 1 point along the every 1.0m of the degree of depth.
Standard penetration test (being called for short " mark passes through test "): mark passes through a kind of method that test is the bearing capacity of foundation soil measuring sand or cohesive soil at the scene.This method is by measuring the weight of predetermined weight from the free hammering ground of a certain certain height, and depth of penetration reaches blow counts during a certain value, to evaluate character and the bearing capacity of this place's foundation soil.Usual weight quality gets 63.5 ± 0.5kG, falls apart from getting 76 ± 2cm.It is a kind of soil exploration method that exploration combines with in situ test that mark passes through test, can obtain the cohesive soil ground standard value of bearing capacity be similar to quickly and easily.The scope of application is applicable to civil construction project, municipal administration, highway, engineering foundation soil in-situ test in general clay, weak soil, loess and close sand soil area.Predominant use.For finding out that stratum is in change that is vertical and horizontal direction; Carry out mechanics layering; Determine natural foundation bearing capacity and pro form bill pile capacity; Differentiate the possibility of sand liquefaction; Determine the undrained shear strength of weak soil; The parameter of load-carrying capacity of soft soil foundation and slope stability is provided.
Vane shear test: vane shear test is the in situ test that a kind of four-bladed vane measures soft clay shear strength.By cross wrench by holing in weak soil at the bottom of press-in hole, rotating with uniform speed, by certain measuring system, recording moment required when it rotates, until damage of soil body, thus calculating soil classifiction.The shear strength recorded by vane-shear test represents the Natural gas composition of soil.
Shallow-layer load plate test: by the rigid slab of certain size and geometry (circular or square) on proposed building place, be placed on tested soil supporting layer, increase load step by step, and the stable settlement recorded under every one-level load, until reach foundation failure standard, load (p)-sedimentation (s) curve (i.e. p-s curve) can be obtained thus.
The mixed hydraulically-filled method in scene of solidification dredged mud provided by the invention, comprises following main contents: the position in the on-the-spot mixed hydraulically-filled region of solidification dredged mud and yardstick, utilize field investigation and field investigation data, the factor of analyzing influence engineering; Grasp solidification dredging technology and device characteristics, arrange dredging, curing compound add with the relation of engineering entirety be connected; Be cured embodiment design and the technology application of dredged mud according to foundation engineering designing requirement, select embodiment and technical method economically; Reach and ensure the duration, reduce construction costs, make rational use of resources and the object of protection of the environment.
Although content of the present invention has done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to limitation of the present invention.After those skilled in the art have read foregoing, for multiple amendment of the present invention and substitute will be all apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (10)
1. solidify the mixed hydraulically-filled method in scene of dredged mud, it is characterized in that, the method comprises:
Step 1, is cured dredged mud scene mixed hydraulically-filled;
Step 2, carries out dredged mud field-hardened;
Step 3, is cured the detection of dredged mud.
2. the mixed hydraulically-filled method in scene of solidification dredged mud as claimed in claim 1, it is characterized in that, described step 1 comprises:
Step 1.1, carries out soil analysis to dredged mud, and index comprises dredged mud severe, moisture content, specific gravity of soil particle, grading analysis, soil strength index and modulus of compressibility;
Step 1.2, selects curing compound;
Step 1.3, determines the mixing match of curing compound and dredged mud, and the mixing ratio of curing compound and dredged mud is 3% ~ 10%;
Step 1.4, mixes curing compound with dredged mud;
Step 1.5, be cured the reinforcing design of dredged mud, determine that the Shear Strength Index of solidifying dredged mud is 1.100 ~ 1.300MPa, modulus of compressibility is 11 ~ 30Mp respectively, reinforcing the thickness of the layer is 4 ~ 6m, the characteristic value of foundation bearing capacity reaching basement process design is 100 ~ 120Mp, and permissible deformation value requires to be 10% ~ 15%;
Step 1.6, determines the curing time of finished product, and it is maintenance 14-28 days at the standard conditions.
3. the mixed hydraulically-filled method in scene of solidification dredged mud as claimed in claim 2, it is characterized in that, described step 1.2 selects curing compound to be count by weight to comprise 45 parts, lime, cement 125 parts, and exciting agent 2 parts.
4. the mixed hydraulically-filled method in scene of solidification dredged mud as claimed in claim 2, it is characterized in that, described step 1.4, its process comprises:
Connect dredged mud pipeline, curing compound blender is installed in the position of the close dredged mud port of export on this pipeline, and blender is connected with curing compound tank, and blender is provided with curing compound valve; Opening curing compound valve makes curing compound enter dredged mud pipeline, and then dredged mud mixes with curing compound through blender position, and curing compound and dredged mud mixture spray.
5. the mixed hydraulically-filled method in scene of solidification dredged mud as claimed in claim 1, it is characterized in that, described step 2 comprises: reinforce the shallow layer soft soil foundation at the mixed hydraulically-filled rear dredged mud scene of step 1 gained; Described shallow-layer refers to the soil body top layer of thickness within 6.0m.
6. the mixed hydraulically-filled method in scene of solidification dredged mud as claimed in claim 4, is characterized in that, described step 2 completes reinforcing to shallow layer soft soil foundation by curing compound and dredged mud being stirred consolidation; Comprise:
In this whipping process, use stirring-head and excavator, the even speed of stirring-head under excavator swing arm drives is moved, makes curing compound slurries being evenly distributed in shallow layer soft soil foundation; When stirring, carry out unit area division to construction area, block-by-block completes; Stir the complete region of construction and spread out and put on sand material or mountain skin soil conduct heap carrier layer, be rolling bulldozed into platform, preloading layer thickness is generally between 0.3 ~ 1 meter.
7. the mixed hydraulically-filled method in scene of solidification dredged mud as claimed in claim 6, it is characterized in that, described curing compound, for accounting for 75 ~ 83% containing fine sand, silty clay soil accounts for 10 ~ 23%, during low containing the glutinous amount dredged mud of full water loose condition (of surface), select powdered curing agent prescription.
8. the mixed hydraulically-filled method in scene of solidification dredged mud as claimed in claim 6, it is characterized in that, described curing compound, accounting for 50 ~ 70% for mud clay content, moisture content between 90 ~ 110%, content of organics is 5 ~ 12%, chloride content is greater than 3% in water Muddy Bottoms dredged mud, select Muddy Bottoms hardener formula.
9. the mixed hydraulically-filled method in scene of solidification dredged mud as claimed in claim 1, it is characterized in that, described step 3 comprises: the behavior of foundation soil that solidification dredged mud is formed before reinforcing, in reinforcing process, reinforced after detect respectively.
10. the mixed hydraulically-filled method in scene of solidification dredged mud as claimed in claim 9, it is characterized in that, described step 3, its test item comprises: carry out core boring sampling, static sounding, standard penetration test, vane shear test, unconfined compression strength test, low strain dynamic and load test at 70.7mm × 70.7mm × 70.7mm test cube.
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| CN108086336A (en) * | 2016-11-22 | 2018-05-29 | 中洁惠能科技（北京）有限公司 | A kind of mud mold bag curing technique and system |
| CN109485372A (en) * | 2018-12-14 | 2019-03-19 | 浙江加州国际纳米技术研究院台州分院 | A kind of shallow-layer muck soil curing agent and its application method |
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